A durability and performance coupling test device and method for refrigeration compressor under acceleration condition

Abstract

The application relates to the technical field of compressors and discloses a device and a method for coupling durability and performance tests of a refrigeration compressor under acceleration conditions. The device comprises a refrigerant circulation assembly, a solenoid valve assembly, a controller and a data acquisition assembly. The refrigerant circulation assembly comprises a condenser, a liquid accumulator, a subcooler and a calorimeter connected in sequence, the condenser inlet is connected with the exhaust end of a test compressor, the calorimeter outlet is connected with the suction end of the test compressor, and a loop for performance test is formed; the inlet of a mixed heat exchanger is connected with the gas conveying pipeline before the condenser inlet through a gas inlet branch and with the liquid conveying pipeline after the subcooler outlet through a liquid inlet branch. The outlet of the mixed heat exchanger is connected with the suction end of the test compressor, and a loop for durability test is formed; the controller adjusts the pipeline communication state by controlling multiple solenoid valves to realize test state switching; and the data acquisition assembly is used for collecting flow, temperature and pressure data during the test. The application can realize quick switching of performance and durability tests.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to a device and method for coupled durability and performance testing of a refrigeration compressor under accelerated conditions. Background Technology

[0002] The compressor is a core component of an air conditioning system, and its performance and durability directly affect the system's operating efficiency and lifespan. To comprehensively evaluate a compressor, both performance and durability tests are typically conducted.

[0003] In existing technologies, performance testing typically employs the "flowmeter method," which guides the entire refrigerant circulation through a calorimeter and calculates the compressor's cooling capacity by combining parameters such as flow rate and temperature. This method offers high testing accuracy, but requires all components to participate in the circulation process, resulting in significant energy consumption. Durability testing usually utilizes the "mixer method," which achieves circulation through the mixing of hot and cold refrigerants, thereby reducing energy consumption. However, this method cannot directly obtain highly accurate performance parameters.

[0004] In traditional test benches, performance testing and durability testing devices are often separate. Switching between the two test modes requires significant modifications to the piping or manual disassembly, resulting in complex operations, low switching efficiency, and a risk of leakage. Alternatively, even if the two devices are within the same system, components such as flow meters used in performance testing are high-precision sensors, generally unsuitable for 24-hour operation, and conflict with durability testing. Therefore, there is an urgent need for a structurally integrated, easily switchable compressor performance and durability coupled test device that can quickly switch between the two test modes within the same piping system through simple control, while ensuring the accuracy of performance testing and the energy efficiency and service life of durability testing. Summary of the Invention

[0005] To address the technical problems in existing technologies, such as the inability to quickly switch between compressor performance tests and durability tests, and the difficulty in maintaining consistent test conditions, this invention provides a coupled durability and performance test device and method for refrigeration compressors under accelerated conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a durability and performance coupling test device for a refrigeration compressor under accelerated conditions, comprising: a refrigerant circulation assembly, a solenoid valve assembly, a controller, and a data acquisition assembly.

[0007] The refrigerant circulation assembly includes a condenser, a liquid receiver, a subcooler, and a calorimeter connected in sequence. The inlet of the condenser is connected to the discharge end of the compressor under test, and the outlet of the calorimeter is connected to the suction end of the compressor under test, forming a first refrigerant circulation loop for performance testing. The refrigerant circulation assembly also includes a mixing heat exchanger. The inlet of the mixing heat exchanger is connected to a gas supply line before the inlet of the condenser via an inlet branch, and to a liquid supply line after the outlet of the subcooler via a liquid supply line. The outlet of the mixing heat exchanger is connected to the suction end of the compressor under test, forming a second refrigerant circulation loop for durability testing. The solenoid valve assembly includes multiple solenoid valves installed on the pipeline; The controller is used to adjust the pipeline connection status by controlling multiple solenoid valves, thereby realizing the switching between performance test and durability test states. In the performance test, the refrigerant discharged from the compressor under test passes through the condenser, receiver, subcooler and calorimeter in sequence for heat exchange before returning to the compressor under test. In the durability test, part of the refrigerant discharged from the compressor under test enters the mixing heat exchanger through the inlet branch, and the other part passes through the condenser, receiver and subcooler and then enters the mixing heat exchanger through the liquid inlet branch. The two refrigerants exchange heat in the mixing heat exchanger before returning to the compressor under test. The data acquisition component is used to collect refrigerant flow, temperature, and pressure data in multiple piping sections during performance and durability testing.

[0008] As a further improvement to the above scheme, the test apparatus also includes: a regulating valve assembly.

[0009] The control valve assembly includes a control valve, a second control valve, and an expansion control valve; The solenoid valve assembly includes solenoid valve one, solenoid valve two, solenoid valve three, solenoid valve four, solenoid valve five, and solenoid valve six. The data acquisition components include flow meter one, flow meter two, temperature and pressure acquisition module one, temperature and pressure acquisition module two, temperature and pressure acquisition module three, temperature and pressure acquisition module four, and temperature and pressure acquisition module five; Among them, solenoid valve one is installed on the pipeline between the discharge end of the compressor under test and the condenser, and temperature and pressure acquisition module one is installed on the pipeline between the discharge end of the compressor under test and solenoid valve one; solenoid valve two, flow meter one, and expansion regulating valve are sequentially installed on the pipeline between the subcooler outlet and the calorimeter inlet, and temperature and pressure acquisition module two is installed on the pipeline between flow meter one and expansion regulating valve; solenoid valve three and flow meter two are sequentially installed on the pipeline between the calorimeter outlet and the suction end of the compressor under test, and temperature and pressure acquisition module three is installed on the pipeline between the calorimeter outlet and solenoid valve three; temperature and pressure acquisition module four is installed on the pipeline between flow meter two and the suction end of the compressor under test; solenoid valve four and regulating valve are sequentially installed on the inlet branch, and solenoid valve five and regulating valve two are sequentially installed on the liquid inlet branch; the outlet of the mixing heat exchanger is connected to the pipeline between flow meter two and temperature and pressure acquisition module four through solenoid valve six, and temperature and pressure acquisition module five is installed on the pipeline between the outlet of the mixing heat exchanger and solenoid valve six.

[0010] As a further improvement to the above solution, the regulating valve assembly also includes an oil regulating valve; The solenoid valve assembly also includes solenoid valve seven, solenoid valve eight, solenoid valve nine and solenoid valve ten. The data acquisition component also includes a temperature acquisition module; The test apparatus also includes an oil circulation assembly.

[0011] The oil circulation assembly includes an oil separator, an oil cooler, and an oil heater. The refrigerant inlet and outlet of the oil separator are connected in parallel to the pipelines at both ends of the solenoid valve one via solenoid valve seven and solenoid valve eight, respectively. The oil outlet of the oil separator is divided into two oil outlet paths. The first oil outlet path is connected to the suction end of the compressor under test via solenoid valve nine, oil cooler, oil heater, oil regulating valve, and temperature acquisition module in sequence. The first oil outlet path is used to regulate the temperature and flow rate of the recovered oil. The second oil outlet path is directly connected to the suction end of the compressor under test via solenoid valve ten.

[0012] As a further improvement to the above scheme, the controller executes the following control strategy during performance testing: Open solenoid valves 7, 8, and 9, and close solenoid valves 1 and 10, so that the refrigerant discharged from the compressor under test passes through the oil separator and is returned to the compressor under test through the first oil outlet; open solenoid valves 2 and 3, and close solenoid valves 4, 5, and 6, so as to form a first refrigerant circulation loop and perform simulated load heat exchange on the refrigerant output from the subcooler through the calorimeter.

[0013] As a further improvement to the above solution, the controller determines whether the oil separator needs to be involved in the durability test during the durability test, and executes the following control strategy: When intervention is required: Solenoid valves 7, 8, and 10 are opened, and solenoid valves 1 and 9 are closed, so that the refrigerant discharged from the compressor under test passes through the oil separator and the oil is recovered to the compressor under test through the second oil outlet; Solenoid valves 4, 5, and 6 are opened, and solenoid valves 2 and 3 are closed, so as to form a second refrigerant circulation loop and mix and exchange heat with the refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger; When no intervention is required: Open solenoid valve one and close solenoid valves seven, eight, nine and ten to allow the refrigerant discharged from the tested compressor to bypass the oil separator; open solenoid valves four, five and six and close solenoid valves two and three to form a second refrigerant circulation loop and mix and exchange the oil-containing refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger.

[0014] As a further improvement to the above scheme, the solenoid valve assembly also includes solenoid valve eleven; one end of solenoid valve eleven is connected to the pipeline between temperature and pressure acquisition module five and solenoid valve six, and the other end is connected to the enthalpy-increasing interface of the test compressor with gas replenishment and enthalpy-increasing function.

[0015] As a further improvement to the above scheme, for the test compressor with gas injection and enthalpy enhancement function, the controller executes the following control strategy during performance testing: Open solenoid valves 7, 8, and 9, and close solenoid valves 1 and 10, so that the refrigerant discharged from the compressor under test passes through the oil separator and is recovered to the compressor under test through the first oil outlet. Open solenoid valves 2, 3, 4, 5, and 11, and close solenoid valve 6, so that the intake branch and the liquid inlet branch remain open on the basis of forming the first refrigerant circulation loop, so that the mixing heat exchanger delivers refrigerant to the enthalpy-increasing interface, forming a gas-injection enthalpy-increasing circulation loop.

[0016] As a further improvement to the above scheme, when conducting performance tests on the test compressor with gas replenishment and enthalpy enhancement function, among all the refrigerant returning to the suction port of the test compressor, the refrigerant output by the calorimeter accounts for 75%-90%, and the refrigerant output by the mixing heat exchanger accounts for 10%-25%.

[0017] This invention also discloses a method for coupled durability and performance testing of a refrigeration compressor under accelerated conditions, applied to the testing apparatus described above; the coupled testing method includes the following steps: Step 1: Obtain the operating parameters of the compressor under test under the set actual operating conditions and the accelerated operating conditions of the durability test; the operating parameters include the compressor's suction and discharge temperatures, suction and discharge pressures, and suction specific volume; Step 2: Based on the operating parameters under different operating conditions, calculate the acceleration factor between the actual operating conditions and the acceleration conditions. σ :

[0018] In the formula, This represents the ratio of the discharge pressure to the intake pressure of the tested compressor under acceleration conditions. The ratio of the discharge pressure to the suction pressure of the tested compressor under actual operating conditions is expressed in kPa / kPa. The specific volume of the tested compressor during acceleration is the intake gas volume. The specific volume of the tested compressor under actual operating conditions is expressed in kg / m³. 3 ; The exhaust temperature of the tested compressor under acceleration conditions. The discharge temperature of the tested compressor under actual operating conditions is expressed in Kelvin. and These are the discharge pressures of the tested compressor under actual operating conditions and under acceleration conditions, respectively. a , b and c These are the pressure conversion coefficient, specific volume conversion coefficient, and comprehensive conversion coefficient for accelerated fatigue testing, respectively; exp(·) is the natural exponential function. Step 3: Obtain the design service life of the tested compressor and divide it by the acceleration factor. σ The durability test duration of the tested compressor was obtained. Step 4: Divide the durability test into multiple stages according to the duration of the durability test. Before the start of the durability test in each stage, conduct a performance test first. Then, adjust the pipeline connection status through the controller to conduct the durability test without stopping the machine. In this way, conduct all stages of the test in turn and record the performance-related data and durability-related data during the test.

[0019] As a further improvement to the above scheme, the performance-related data includes the cooling capacity, energy efficiency ratio, circulating refrigerant flow rate, suction and discharge temperature, suction and discharge pressure, and motor temperature of the tested compressor; the durability-related data includes the suction and discharge temperature, suction and discharge pressure, compressor power, and ambient temperature of the tested compressor.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention integrates the performance test circuit and the durability test cycle circuit into a single refrigerant circulation device. Through a reasonable pipeline layout and combined control of electric valves, it achieves rapid switching between the two test modes on the same device, avoiding the drawbacks of frequent pipeline modifications when using different test devices, saving equipment space and reducing construction costs. In performance test mode, all refrigerant flows through the calorimeter, allowing for accurate measurement of the compressor's cooling or heating capacity. In durability test mode, the refrigerant circulates through hot and cold mixing, significantly reducing system energy consumption. Since both tests are conducted in the same closed loop, it not only reduces the risk of leakage caused by switching or disassembly but also improves the safety and stability of system operation. Furthermore, the device's pipeline and control design can adapt to the testing needs of different types of compressors and different refrigerants, exhibiting good versatility and expandability.

[0021] 2. The testing apparatus of this invention can maintain the compressor's operating state to the greatest extent after a single installation, avoiding changes in operating parameters such as oil quality and moisture content, thus providing higher assurance of test accuracy. When switching between performance testing and durability testing, instantaneous switching can be achieved, effectively maintaining the temperature, thermal expansion conditions, and lubricating oil condition of each compressor component, ensuring maximum continuity and consistency of the test. This design can comprehensively evaluate the compressor's reliability and the impact of durability testing on performance, providing reliable test data for compressor research and optimization.

[0022] 3. The test device of the present invention can use high-precision flow meters and other sensors to achieve accurate measurement during the performance test stage, and these sensors can be taken out of service after switching to the durability test. This satisfies the accuracy requirements of the performance test, avoids the reduction in lifespan caused by long-term continuous operation of high-precision sensors, reduces maintenance and replacement costs, and improves the overall operating efficiency of the device.

[0023] 4. The coupled testing method of this invention obtains key parameters under actual operating conditions and accelerated operating conditions, scientifically calculates the acceleration factor, thereby reasonably shortening the durability test duration and significantly reducing test time and energy consumption. Simultaneously, it adopts a phased alternating performance and durability test mode, achieving seamless switching under non-stop conditions, ensuring stable and consistent test conditions, and improving test efficiency and data reliability. This method, combined with an energy-saving hybrid heat exchanger durability testing system, further reduces the energy consumption of long-term durability tests, meeting the requirements for efficient, low-consumption coupled evaluation of compressor performance and durability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the compressor performance and durability coupling test device in an embodiment of the present invention.

[0025] Figure 2 for Figure 1 A schematic diagram of the pipeline connection status of the test device during performance testing.

[0026] Figure 3 for Figure 1 A schematic diagram of the pipeline connection status of the test apparatus during durability testing.

[0027] Figure 4 for Figure 1 A schematic diagram of the pipeline connection status of the test device during the heat pump performance test.

[0028] Figure 5 This is a flowchart of the durability and performance coupling test method in Embodiment 1 of the present invention.

[0029] In the diagram: 1. Test compressor; 101. Enthalpy-increasing interface; 21. Condenser; 22. Liquid receiver; 23. Subcooler; 24. Calorimeter; 25. Mixing heat exchanger; 31. Solenoid valve one; 32. Solenoid valve two; 33. Solenoid valve three; 34. Solenoid valve four; 35. Solenoid valve five; 36. Solenoid valve six; 37. Solenoid valve seven; 38. Solenoid valve eight; 39. Solenoid valve nine; 310. Solenoid valve ten; 311. Solenoid valve eleven; 41. Adjustment... 42. Regulating Valve 1; 43. Expansion Regulating Valve; 44. Oil Regulating Valve; 501. Flow Meter 1; 502. Flow Meter 2; 511. Temperature and Pressure Acquisition Module 1; 512. Temperature and Pressure Acquisition Module 2; 513. Temperature and Pressure Acquisition Module 3; 514. Temperature and Pressure Acquisition Module 4; 515. Temperature and Pressure Acquisition Module 5; 516. Temperature Acquisition Module; 61. Oil Separator; 62. Oil Cooler; 63. Oil Heater. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] Please see Figures 1 to 4 This embodiment provides a durability and performance coupling test device for a refrigeration compressor under accelerated conditions, including a refrigerant circulation assembly, a solenoid valve assembly, a controller, and a data acquisition assembly, and may also include a regulating valve assembly and an oil circulation assembly.

[0033] The refrigerant circulation assembly includes a condenser 21, a liquid receiver 22, a subcooler 23, and a calorimeter 24 connected in sequence. The inlet of the condenser 21 is connected to the discharge end of the compressor under test 1, and the outlet of the calorimeter 24 is connected to the suction end of the compressor under test 1, forming a first refrigerant circulation loop for performance testing. The refrigerant circulation assembly also includes a mixing heat exchanger 25. The inlet of the mixing heat exchanger 25 is connected to the gas supply line before the inlet of the condenser 21 through an inlet branch, and to the liquid supply line after the outlet of the subcooler 23 through a liquid supply line. The outlet of the mixing heat exchanger 25 is connected to the suction end of the compressor under test 1, forming a second refrigerant circulation loop for durability testing. The solenoid valve assembly includes multiple solenoid valves installed on the pipeline, namely solenoid valve 31 to solenoid valve 311.

[0034] The controller is used to adjust the pipeline connection status by controlling multiple solenoid valves, thereby realizing the switching between performance test and durability test states. In the performance test, the refrigerant discharged from the test compressor 1 passes through the condenser 21, the liquid receiver 22, the subcooler 23, and the calorimeter 24 in sequence for heat exchange before returning to the test compressor 1. In the durability test, part of the refrigerant discharged from the test compressor 1 enters the mixing heat exchanger 25 through the inlet branch, and the other part passes through the condenser 21, the liquid receiver 22, and the subcooler 23 before entering the mixing heat exchanger 25 through the liquid inlet branch. The two refrigerants exchange heat in the mixing heat exchanger 25 before returning to the test compressor 1. The regulating valve assembly includes regulating valve 41, regulating valve 42, and expansion regulating valve 43, and also includes oil regulating valve 44.

[0035] The data acquisition component is used to collect refrigerant flow, temperature, and pressure data in multiple pipeline sections during performance and durability tests. Specifically, the data acquisition component includes flow meter 501, flow meter 502, temperature and pressure acquisition module 511, temperature and pressure acquisition module 512, temperature and pressure acquisition module 513, temperature and pressure acquisition module 514, and temperature and pressure acquisition module 515, and may also include a temperature acquisition module 516.

[0036] It should be noted that the temperature and pressure acquisition module refers to a module that integrates temperature and pressure acquisition functions, and can consist of a temperature sensor and a pressure sensor installed in the same location. The temperature acquisition module 516, however, consists only of a temperature sensor. Both flowmeter 501 and flowmeter 502 can be volumetric flow meters.

[0037] Solenoid valve 31 is installed on the pipeline between the discharge end of the compressor under test 1 and the condenser 21, and temperature and pressure acquisition module 511 is installed on the pipeline between the discharge end of the compressor under test 1 and solenoid valve 31; solenoid valve 32, flow meter 501, and expansion regulating valve 43 are sequentially installed on the pipeline between the outlet of the subcooler 23 and the inlet of the calorimeter 24, and temperature and pressure acquisition module 512 is installed on the pipeline between flow meter 501 and expansion regulating valve 43; solenoid valve 33 and flow meter 502 are sequentially installed on the pipeline between the outlet of the calorimeter 24 and the suction end of the compressor under test 1, and temperature and pressure acquisition module 511 is installed on the pipeline between the discharge end of the compressor under test 1 and the condenser 21. Module 3 513 is installed on the pipeline between the outlet of calorimeter 24 and solenoid valve 33; temperature and pressure acquisition module 4 514 is installed on the pipeline between flow meter 2 502 and the suction end of the compressor under test 1; solenoid valve 4 34 and regulating valve 41 are sequentially installed on the inlet branch; solenoid valve 5 35 and regulating valve 2 42 are sequentially installed on the liquid inlet branch; the outlet of mixing heat exchanger 25 is connected to the pipeline between flow meter 2 502 and temperature and pressure acquisition module 4 514 through solenoid valve 6 36, and temperature and pressure acquisition module 5 515 is installed on the pipeline between the outlet of mixing heat exchanger 25 and solenoid valve 6 36.

[0038] The oil circulation assembly includes an oil separator 61, an oil cooler 62, and an oil heater 63. The refrigerant inlet and refrigerant outlet of the oil separator 61 are connected in parallel to the pipelines at both ends of the solenoid valve 31 via solenoid valve 37 and solenoid valve 38, respectively. The oil outlet of the oil separator 61 is divided into two oil outlet paths. The first oil outlet path is connected to the suction end of the compressor under test 1 via solenoid valve 39, oil cooler 62, oil heater 63, oil regulating valve 44, and temperature acquisition module 516 in sequence. The first oil outlet path is used to regulate the temperature and flow rate of the recovered oil. The second oil outlet path is directly connected to the suction end of the compressor under test 1 via solenoid valve 310.

[0039] The controller executes the following control strategy during performance testing: Open solenoid valves 7 (37), 8 (38), and 9 (39), and close solenoid valves 1 (31) and 10 (310) so that the refrigerant discharged from the test compressor 1 passes through the oil separator 61 and is recovered to the test compressor 1 through the first oil outlet; open solenoid valves 2 (32) and 3 (33), and close solenoid valves 4 (34), 5 (35), and 6 (36) to form a first refrigerant circulation loop and perform simulated load heat exchange on the refrigerant output from the subcooler 23 through the calorimeter 24.

[0040] During this performance test, the refrigerant discharged from the tested compressor 1 enters the oil separator 61 through solenoid valve 7 37, where the oil is separated. The refrigerant then flows through solenoid valve 8 38 into the condenser 21, where it is condensed into a high-pressure liquid. It then flows into the receiver 22, exits into the subcooler 23, where the subcooling is further regulated. After exiting the receiver 23, it passes through solenoid valve 2 32 into flow meter 1 501, then through expansion regulating valve 43 for throttling before entering the calorimeter 24. Finally, it flows through solenoid valve 3 33 and flow meter 2 502 before entering the suction port of the tested compressor 1, completing one cycle. During the performance test, it is ensured that the mixing heat exchanger 25 and its intake and liquid inlet branches do not participate in the test process. Furthermore, temperature and pressure acquisition modules 1 511, 2 512, 3 513, 4 514, and temperature acquisition module 516 are all in use, allowing the calculation of the compressor's cooling capacity to be measured during the performance test. The oil separated by oil separator 61 passes sequentially through solenoid valve 39, oil cooler 62, oil heater 63, and oil regulating valve 44, finally returning to the suction port of the tested compressor 1, where it enters the compressor along with the refrigerant, forming a cycle. Because the flow rate and temperature of the refrigeration oil need to be adjusted during performance testing, solenoid valve 310 in the oil circuit is closed at this time.

[0041] During the durability test, the controller determines whether the oil separator 61 needs to be involved and executes the following control strategy: When no intervention is required: Open solenoid valve 1 31 and close solenoid valves 7 37, 8 38, 9 39 and 10 310, so that the refrigerant discharged from the tested compressor 1 bypasses the oil separator 61; open solenoid valves 4 34, 5 35 and 6 36, and close solenoid valves 2 32 and 3 33, to form a second refrigerant circulation loop and mix and exchange heat with the oil-containing refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger 25. At this time, the refrigerant discharged from the tested compressor 1 is divided into two paths after passing through solenoid valve 1 31. One path enters the condenser 21 and is condensed into a high-pressure liquid, then flows into the liquid receiver 22 and the subcooler 23, where the subcooling degree is further adjusted, and then flows through solenoid valve 5 35 and regulating valve 2 42 before entering the mixing heat exchanger 25; the other path is a high-temperature, high-pressure gas that enters the mixing heat exchanger 25 after passing through solenoid valve 4 34 and regulating valve 1 41. After the two refrigerants are mixed, they enter the mixing heat exchanger 25 for sufficient heat exchange to form a low-pressure superheated refrigerant gas. After flowing through the solenoid valve 36, the gas enters the suction port of the compressor under test 1 to complete one cycle.

[0042] Some actual operating systems contain an oil separator 61. When the oil separator 61 needs to be involved: solenoid valves 7 37, 8 38, and 10 310 are opened, and solenoid valves 1 31 and 9 39 are closed, so that the refrigerant discharged from the test compressor 1 passes through the oil separator 61 and is recovered to the test compressor 1 through the second oil outlet; solenoid valves 4 34, 5 35, and 6 36 are opened, and solenoid valves 2 32 and 3 33 are closed, so as to form a second refrigerant circulation loop and mix and exchange heat with the refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger 25.

[0043] One end of solenoid valve 11311 is connected to the pipeline between temperature and pressure acquisition module 515 and solenoid valve 636, and the other end is connected to the enthalpy-increasing interface 101 of the test compressor 1 with gas replenishment and enthalpy-increasing function.

[0044] Specifically, for certain test compressors 1 with gas injection and enthalpy enhancement functions, the controller executes the following control strategy during performance testing (i.e., heat pump performance testing): Open solenoid valves 37, 38, and 39, and close solenoid valves 31 and 310, so that the refrigerant discharged from the test compressor 1 passes through the oil separator 61 and is recovered to the test compressor 1 via the first oil outlet. Open solenoid valves 32, 33, 34, 35, and 311, and close solenoid valve 36, so that the intake branch and the liquid inlet branch remain open on the basis of forming the first refrigerant circulation loop, so that the mixing heat exchanger 25 delivers refrigerant to the enthalpy-increasing interface 101, forming a gas replenishment enthalpy-increasing circulation loop.

[0045] When conducting performance tests on the test compressor 1 with gas replenishment and enthalpy enhancement functions, among all the refrigerant returning to the suction port of the test compressor 1, the refrigerant output by the calorimeter 24 accounts for 75%-90%, and the refrigerant output by the mixing heat exchanger 25 accounts for 10%-25%.

[0046] During the heat pump performance test, temperature and pressure acquisition modules 511 to 515 and temperature acquisition module 516 are all put into use. Combined with the measured values ​​of flow meter 501 and flow meter 502, the heat capacity of the compressor to be measured in the heat pump performance test is calculated.

[0047] Please see Figure 5 This embodiment also provides a method for coupled durability and performance testing of a refrigeration compressor under accelerated conditions, applied to the testing apparatus described above; the coupled testing method includes the following steps: Step 1: Obtain the operating parameters of the compressor under test 1 under the set actual operating conditions and the accelerated operating conditions of the durability test; the operating parameters include the compressor suction and discharge temperature, suction and discharge pressure, and suction specific volume.

[0048] Step 2: Based on the operating parameters under different operating conditions, calculate the acceleration factor between the actual operating conditions and the acceleration conditions. σ :

[0049] In the formula, The ratio of the discharge pressure to the intake pressure of the tested compressor 1 under acceleration conditions. The ratio of the discharge pressure to the suction pressure of the tested compressor 1 under actual operating conditions is expressed in kPa / kPa. The specific volume of the intake gas of the tested compressor 1 under acceleration conditions. The specific volume of the tested compressor 1 under actual operating conditions is expressed in kg / m³. 3 ; The exhaust temperature of the tested compressor 1 under acceleration conditions. The discharge temperature of the tested compressor 1 under actual operating conditions is expressed in Kelvin. and The discharge pressures of the tested compressor (1) under actual operating conditions and under acceleration conditions are respectively; a , b and c These are the pressure conversion coefficient, specific volume conversion coefficient, and comprehensive conversion coefficient for accelerated fatigue testing, respectively; exp(·) is the natural exponential function.

[0050] Step 3: Obtain the design service life of the tested compressor 1 and divide it by the acceleration factor. σ The durability test duration of the tested compressor 1 was obtained. It should be noted that the design service life refers to the designed or expected trouble-free operating time.

[0051] Step 4: Divide the durability test into multiple stages according to the duration of the durability test. Before the start of the durability test in each stage, conduct a performance test first. Then, adjust the pipeline connection status through the controller to conduct the durability test without stopping the machine. In this way, conduct all stages of the test in turn and record the performance-related data and durability-related data during the test.

[0052] The performance-related data include the cooling capacity, energy efficiency ratio, circulating refrigerant flow rate, suction and discharge temperatures, suction and discharge pressures, and motor temperature of the tested compressor 1; the durability-related data include the suction and discharge temperatures, suction and discharge pressures, compressor power, and ambient temperature of the tested compressor 1.

[0053] Example 2

[0054] This embodiment uses the durability and performance coupling test device and method of the refrigeration compressor under accelerated conditions in Embodiment 1 to conduct a test on a certain type of train air conditioning compressor.

[0055] For example, if we calculate the total operating time of a train air conditioning compressor based on 18 hours of operation per day from May to October, and 4 hours of operation per day in April, assuming 30 days per month, then the compressor's annual operating time would be: 6 × 30 × 18 + 30 × 4 = 3360 hours / (year·unit). This compressor needs to operate reliably continuously for 3 years, meaning its mean time between failures (MTBF) is 10080 hours.

[0056] Extensive experimental results based on the device according to the present invention demonstrate that by conducting accelerated model tests on the compressor under study, a reliability accelerated life + real-time performance test model for the compressor is established, thereby calculating the acceleration factor between actual operating conditions and accelerated operating conditions. The test model parameters include temperature, compressor suction and discharge pressure ratio, compressor speed, and a composite model obtained by integrating the Arrhenius model and the inverse power law model.

[0057] In this embodiment, the formula for calculating the acceleration factor is:

[0058] The operating parameters of the compressor in this embodiment under a basic operating condition and an acceleration operating condition are shown in Table 1.

[0059] Table 1: Operating parameters of the compressor

[0060] The acceleration factor can be calculated from the data in this table. σ The value is 5.3. Therefore, the device and method of this invention can perform durability testing for a duration of 10080 / 5.3 = 1902 hours. One prototype is selected for accelerated life performance synchronous testing. The specific operating procedure is as follows: a) The total duration of the durability test of the compressor is T=1902h. The durability test process is divided into 3 stages, and the compressor runs continuously for 634h in each stage.

[0061] b) First, conduct a performance test by switching the test device to performance mode.

[0062] c) Conduct the first stage of the durability test at t=634h, and record the compressor operating data throughout the entire time period t, including the compressor suction and discharge temperatures, suction and discharge pressures, ambient temperature, compressor power, etc.

[0063] d) After the duration t durability test, there is no need to stop the machine and replace the pipeline. Directly switch the valves in the device and conduct the same performance test as in step b) above. Compare the performance test results with the performance results of the first stage b), such as cooling capacity, energy efficiency ratio, flow rate, suction and exhaust pressure and temperature, motor temperature, etc.

[0064] e) Conduct the second stage of the durability test at t=634h, and record the compressor operating data throughout the entire time period t: including compressor suction and discharge temperatures, suction and discharge pressures, ambient temperature, compressor power, etc.

[0065] f) After the durability test of duration t, there is no need to stop the machine and replace the pipeline. Directly switch the valves in the device and conduct the same performance test as in step b) above. Compare the performance test results with the performance results of the first and second stages b), such as cooling capacity, energy efficiency ratio, flow rate, suction and exhaust pressure and temperature, motor temperature, and other data.

[0066] g) Conduct the third stage of the durability test at t=634h, and record the compressor operating data throughout the entire time period t, including compressor suction and discharge temperatures, suction and discharge pressures, ambient temperature, compressor power, etc.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions, characterized in that, include: The refrigerant circulation assembly includes a condenser (21), a liquid receiver (22), a subcooler (23), and a calorimeter (24) connected in sequence. The inlet of the condenser (21) is connected to the exhaust end of the compressor under test (1), and the outlet of the calorimeter (24) is connected to the suction end of the compressor under test (1), forming a first refrigerant circulation loop for performance testing. The refrigerant circulation assembly also includes a mixing heat exchanger (25). The inlet of the mixing heat exchanger (25) is connected to the gas supply line before the inlet of the condenser (21) through an inlet branch, and to the liquid supply line after the outlet of the subcooler (23) through a liquid supply branch. The outlet of the mixing heat exchanger (25) is connected to the suction end of the compressor under test (1), forming a second refrigerant circulation loop for durability testing. Solenoid valve assembly, including multiple solenoid valves disposed on a pipeline; The controller is used to adjust the pipeline connection state by controlling multiple solenoid valves, thereby realizing the state switching between performance test and durability test. In the performance test, the refrigerant discharged by the test compressor (1) passes through the condenser (21), the liquid receiver (22), the subcooler (23), and the calorimeter (24) in sequence for heat exchange and then returns to the test compressor (1). In the durability test, part of the refrigerant discharged by the test compressor (1) enters the mixing heat exchanger (25) through the intake branch, and the other part passes through the condenser (21), the liquid receiver (22), and the subcooler (23) and then enters the mixing heat exchanger (25) through the liquid inlet branch. The two refrigerants exchange heat in the mixing heat exchanger (25) and then return to the test compressor (1). The data acquisition component is used to collect refrigerant flow, temperature, and pressure data in multiple piping sections during performance and durability testing.

2. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 1, characterized in that, Also includes: The control valve assembly includes a control valve (41), a second control valve (42), and an expansion control valve (43). The solenoid valve assembly includes solenoid valve one (31), solenoid valve two (32), solenoid valve three (33), solenoid valve four (34), solenoid valve five (35), and solenoid valve six (36). The data acquisition components include flow meter one (501), flow meter two (502), temperature and pressure acquisition module one (511), temperature and pressure acquisition module two (512), temperature and pressure acquisition module three (513), temperature and pressure acquisition module four (514), and temperature and pressure acquisition module five (515). Among them, solenoid valve one (31) is installed on the pipeline between the exhaust end of the tested compressor (1) and the condenser (21), and temperature and pressure acquisition module one (511) is installed on the pipeline between the exhaust end of the tested compressor (1) and solenoid valve one (31); solenoid valve two (32), flow meter one (501) and expansion regulating valve (43) are installed sequentially on the pipeline between the outlet of the subcooler (23) and the inlet of the calorimeter (24), and temperature and pressure acquisition module two (512) is installed on the pipeline between flow meter one (501) and expansion regulating valve (43); solenoid valve three (33) and flow meter two (502) are installed sequentially on the pipeline between the outlet of the calorimeter (24) and the suction end of the tested compressor (1), and temperature and pressure acquisition module two (511) is installed on the pipeline between the exhaust end of the tested compressor (1) and solenoid valve one (31 ... two (32), flow meter one (501) and expansion regulating valve (43) are installed sequentially on the pipeline between the outlet of the calorimeter (24) and the suction end of the tested compressor (1), and temperature and pressure acquisition module two (511) is installed on the pipeline between the exhaust end of the tested compressor (1) and solenoid valve one (311). Force acquisition module three (513) is installed on the pipeline between the outlet of calorimeter (24) and solenoid valve three (33), and temperature and pressure acquisition module four (514) is installed on the pipeline between flow meter two (502) and the suction end of the compressor under test (1); solenoid valve four (34) and regulating valve (41) are installed in sequence on the air inlet branch, and solenoid valve five (35) and regulating valve two (42) are installed in sequence on the liquid inlet branch; the outlet of mixing heat exchanger (25) is connected to the pipeline between flow meter two (502) and temperature and pressure acquisition module four (514) through solenoid valve six (36), and temperature and pressure acquisition module five (515) is installed on the pipeline between the outlet of mixing heat exchanger (25) and solenoid valve six (36).

3. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 2, characterized in that, The regulating valve assembly also includes an oil regulating valve (44). The solenoid valve assembly also includes solenoid valve seven (37), solenoid valve eight (38), solenoid valve nine (39) and solenoid valve ten (310). The data acquisition component also includes a temperature acquisition module (516). The test apparatus also includes: The oil circulation assembly includes an oil separator (61), an oil cooler (62), and an oil heater (63). The refrigerant inlet and refrigerant outlet of the oil separator (61) are connected in parallel to the pipelines at both ends of the solenoid valve (31) via solenoid valve seven (37) and solenoid valve eight (38), respectively. The oil outlet of the oil separator (61) is divided into two oil outlet paths. The first oil outlet path is connected to the suction end of the compressor under test (1) via solenoid valve nine (39), oil cooler (62), oil heater (63), oil regulating valve (44), and temperature acquisition module (516) in sequence. The first oil outlet path is used to regulate the temperature and flow rate of the recovered oil. The second oil outlet path is directly connected to the suction end of the compressor under test (1) via solenoid valve ten (310).

4. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 3, characterized in that, The controller executes the following control strategy during performance testing: Open solenoid valves 7 (37), 8 (38), and 9 (39), and close solenoid valves 1 (31) and 10 (310) so that the refrigerant discharged from the test compressor (1) passes through the oil separator (61) and is recovered to the test compressor (1) through the first oil outlet; open solenoid valves 2 (32) and 3 (33), and close solenoid valves 4 (34), 5 (35), and 6 (36) to form a first refrigerant circulation loop and perform simulated load heat exchange on the refrigerant output from the subcooler (23) through the calorimeter (24).

5. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 3, characterized in that, During the durability test, the controller determines whether the oil separator (61) needs to be involved and executes the following control strategy: When intervention is required: open solenoid valves 7 (37), 8 (38), and 10 (310), and close solenoid valves 1 (31) and 9 (39) so that the refrigerant discharged from the test compressor (1) passes through the oil separator (61) and the oil is recovered to the test compressor (1) through the second oil outlet; open solenoid valves 4 (34), 5 (35), and 6 (36), and close solenoid valves 2 (32) and 3 (33) to form a second refrigerant circulation loop and mix and exchange the refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger (25); When no intervention is required: open solenoid valve one (31) and close solenoid valve seven (37), solenoid valve eight (38), solenoid valve nine (39) and solenoid valve ten (310) so that the refrigerant discharged by the tested compressor (1) bypasses the oil separator (61); open solenoid valve four (34), solenoid valve five (35) and solenoid valve six (36) and close solenoid valve two (32) and solenoid valve three (33) to form a second refrigerant circulation loop and mix and exchange the oil-containing refrigerant from the intake branch and the liquid inlet branch through the mixing heat exchanger (25).

6. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 3, characterized in that, The solenoid valve assembly also includes solenoid valve eleven (311); one end of solenoid valve eleven (311) is connected to the pipeline between temperature and pressure acquisition module five (515) and solenoid valve six (36), and the other end is connected to the enthalpy interface (101) of the test compressor (1) with gas replenishment and enthalpy increase function.

7. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 6, characterized in that, For the test compressor (1) with gas injection and enthalpy enhancement function, the controller executes the following control strategy during the performance test: Open solenoid valves 7 (37), 8 (38), and 9 (39), and close solenoid valves 1 (31) and 10 (310) so that the refrigerant discharged by the test compressor (1) passes through the oil separator (61) and the oil is recovered to the test compressor (1) through the first oil outlet; open solenoid valves 2 (32), 3 (33), 4 (34), 5 (35), and 11 (311), and close solenoid valve 6 (36) so that, on the basis of forming the first refrigerant circulation loop, the gas inlet branch and the liquid inlet branch are kept in passage so that the mixing heat exchanger (25) delivers refrigerant to the enthalpy-increasing interface (101) to form a gas replenishment enthalpy-increasing circulation loop.

8. The durability and performance coupling test apparatus for a refrigeration compressor under accelerated conditions according to claim 7, characterized in that, When the test compressor (1) with gas replenishment and enthalpy increase function is tested, among all the refrigerant returning to the suction port of the test compressor (1), the refrigerant output by the calorimeter (24) accounts for 75%-90%, and the refrigerant output by the mixing heat exchanger (25) accounts for 10%-25%.

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