A method for testing the reliability of a compressor for a refrigeration device

Abstract

The application provides a reliability test method for a compressor of a refrigeration equipment, and relates to the technical field of compressor test and measurement.The reliability test method for the compressor of the refrigeration equipment collects the worst working condition point of the compressor according to the actual operation condition of the refrigeration equipment, and builds a compressor reliability test system to perform reliability test and measurement on the compressor, so that the test result is more accurate and has universality; on this basis, an oil-gas separator is arranged on the compressor reliability test system, so that the compressor reliability test system can operate in a normal test mode and a limit test mode; in the limit test mode, the compressor can operate in an extreme working condition, and is used for simulating the reliability test of the insufficient oil supply capacity of the crankshaft of the compressor caused by the untimely return of the refrigeration oil in the operation process of the compressor, so as to quickly identify the weak points of the compressor design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor test, in particular to a reliability test method of compressor for refrigeration equipment. BACKGROUND

[0002] At present, the industry generally adopts the reliability test specified in the European standard CECOMAF and the national standard GB / T 9098 for the compressor product, and on this basis, combined with the requirements of each company, the reliability test process of each company is formed and tested. However, for the compressor product, since the application of the refrigeration equipment has uncertainty, and the test is carried out according to the above test process, the test process is single, and the reliability test cannot be carried out according to the actual operation condition corresponding to different refrigeration equipment, which leads to the test result is not accurate enough, and affects the performance and service life of the compressor and the refrigeration equipment. SUMMARY

[0003] The purpose of the present application is to provide a reliability test method of compressor for refrigeration equipment, so as to carry out reliability test of compressor according to the actual operation condition of refrigeration equipment, and the test result is accurate.

[0004] In order to achieve the above purpose, the technical solution adopted by the present application is as follows:

[0005] A reliability test method of compressor for refrigeration equipment, the method comprises the following steps:

[0006] Step 1, test the actual operation condition of refrigeration equipment

[0007] Start the refrigeration equipment according to the actual operation condition, and collect several groups of suction pressure and discharge pressure in the running process of the compressor of the refrigeration equipment;

[0008] Step 2, determine the worst working condition point of the compressor

[0009] Draw the pressure working condition operation diagram of the compressor from the several groups of suction pressure and discharge pressure, determine the worst working condition point of the compressor from the pressure working condition operation diagram, and the suction pressure value, discharge pressure value, shell temperature value and environment temperature value of the compressor corresponding to the worst working condition point are taken as the test conditions of the reliability test in step 4;

[0010] Step 3, build a reliability test system of compressor

[0011] The discharge end of the compressor is connected with the condenser through the first pipeline, the condenser is connected with the evaporator through the second pipeline, the evaporator is connected with the suction end of the compressor through the third pipeline, the discharge pressure gauge is connected with the discharge end of the compressor, the suction pressure gauge is connected with the suction end of the compressor, and the start-stop control end of the compressor is connected with the controller through the signal cable;

[0012] Step 4, reliability test

[0013] Under the environment temperature corresponding to the most severe working condition point, the starting duration and stopping time of the compressor are controlled by the controller, so that the values of the suction pressure gauge, the discharge pressure gauge and the shell temperature value reach the suction pressure value, the discharge pressure value and the shell temperature value of the compressor corresponding to the most severe working condition point, and the service life of the compressor is tested.

[0014] Preferably, in step 3, the discharge end of the compressor is further connected to the condenser through a fourth pipeline, and an oil-gas separator and a first valve are arranged on the fourth pipeline, and a second valve is arranged on the first pipeline;

[0015] Between step 3 and step 4, the compressor reliability test system is switched to the ordinary test mode or the limit test mode;

[0016] Ordinary test mode:

[0017] The first valve is closed, and the second valve is opened, so that the high-temperature and high-pressure gas at the discharge end of the compressor does not pass through the oil-gas separator, but directly enters the condenser;

[0018] Limit test mode:

[0019] The first valve is opened, and the second valve is closed, so that the high-temperature and high-pressure gas at the discharge end of the compressor first passes through the oil-gas separator and then enters the condenser, and the refrigerant oil separated out of the oil-gas separator is discharged and does not enter the compressor reliability test system.

[0020] Preferably, the discharge end of the oil-gas separator is connected to a first throttling unit, and the separated refrigerant oil is discharged through the first throttling unit, and the oil amount of the refrigerant oil discharged from the oil-gas separator is adjusted through the first throttling unit.

[0021] Preferably, in step 1, electrical parameters and temperature parameters during the operation of the compressor of the refrigeration equipment are also collected, and whether the operation of the compressor of the refrigeration equipment is normal is determined through the electrical parameters and the temperature parameters; when the operation of the compressor of the refrigeration equipment is normal, the collected several groups of suction pressure and discharge pressure data are valid.

[0022] Preferably, in step 3, a second throttling unit is connected to the second pipeline, and the gas pressure before entering the evaporator is reduced through the second throttling unit.

[0023] Preferably, in step 3, a drying filter is connected to the second pipeline, and the gas is dried and filtered through the drying filter.

[0024] Preferably, in step 1, at least one complete defrosting control cycle during the operation of the compressor of the refrigeration equipment is collected.

[0025] The beneficial technical effects of the present application are:

[0026] The compressor reliability test method for the refrigeration equipment of the present application can collect the worst working condition points of the compressor according to the actual operation condition of the refrigeration equipment, and test the reliability of the compressor by building a compressor reliability test system, so that the test result is more accurate and has universality; on this basis, an oil-gas separator is arranged on the compressor reliability test system, so that the compressor reliability test system can run in the ordinary test mode and the limit test mode respectively, and in the limit test mode, the compressor can run in the extreme condition, which is used for simulating the reliability test of the insufficient oil supply capacity of the crankshaft of the compressor due to the untimely return of the refrigeration oil in the operation process of the compressor, so as to quickly identify the weak points of the compressor design. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 The flow chart of the compressor reliability test method for the refrigeration equipment of the present application is shown in the figure.

[0028] Fig. 2 The pressure working condition operation diagram of the compressor of the present application is shown in the figure.

[0029] Fig. 3 The principle arrangement diagram of the compressor reliability test system of the present application is shown in the figure. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and beneficial effects of the present application clearer and more apparent, the present application will be further described in detail below in combination with specific embodiments and with reference to the drawings. Some but not all of the embodiments of the present application will be shown in the drawings. In fact, various embodiments of the present application can be implemented in many different forms, and should not be interpreted as being limited to the embodiments described herein; on the contrary, these embodiments are provided to meet the applicable legal requirements.

[0031] In the description of the present application, it should be noted that the terms "inner", "outer", "upper", "lower", "front", "rear" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the embodiments of the present application, a compressor reliability test method for refrigeration equipment is provided, please refer to Figs. 1-3 shown.

[0033] A compressor reliability test method for refrigeration equipment, comprising the following steps:

[0034] Step 1, actual operation condition test of refrigeration equipment

[0035] The refrigeration equipment in the embodiment is a refrigerator. The refrigeration equipment is started and run according to an actual operation condition, and a plurality of groups of suction pressure and discharge pressure in the running process of the compressor of the refrigeration equipment are collected. The actual operation condition is mainly determined according to the type of the refrigeration equipment, power supply, standard climate type, running characteristic temperature, temperature grade of the refrigeration appliance and test environment type. The set range of the test environment type contains -20℃ to 48℃, and the specific set temperature points are not less than 4. At least one complete defrosting control cycle is contained in the running process of the compressor of the refrigeration equipment.

[0036] In step 1, electrical parameters (voltage, current and power, etc.) and temperature parameters (in-box temperature of the refrigeration equipment) in the running process of the compressor of the refrigeration equipment are also collected, so as to judge whether the running of the compressor of the refrigeration equipment is normal or not. When the running of the compressor of the refrigeration equipment is normal, the collected plurality of groups of suction pressure and discharge pressure data are valid.

[0037] Step 2, determination of the worst working condition point of the compressor

[0038] The pressure working condition running graph of the compressor is drawn according to the plurality of groups of suction pressure and discharge pressure, as shown in FIG. 1. Fig. 2 The worst working condition point of the compressor is determined according to the pressure working condition running graph. The worst working condition point of the compressor is the value of the area circled by the square in the graph. The suction pressure value, discharge pressure value, shell temperature value and environment temperature value of the compressor corresponding to the worst working condition point are taken as the test conditions of the reliability test in step 5. In the embodiment, the suction pressure value of the compressor corresponding to the worst working condition point is about 0.43MP a , the discharge pressure value is about 2.45MP a , the shell temperature value is about 85℃, and the environment temperature value is about 43℃. Both the suction pressure and the discharge pressure are absolute pressure.

[0039] Step 3, building of the reliability test system of the compressor

[0040] The discharge end of the compressor 1 is connected to the condenser 3 through the first pipeline 21, the condenser 3 is connected to the evaporator 4 through the second pipeline 22, the evaporator 4 is connected to the suction end of the compressor 1 through the third pipeline 23, the discharge pressure gauge 51 is connected to the discharge end of the compressor 1, the suction pressure gauge 52 is connected to the suction end of the compressor 1, and the start-stop control end of the compressor 1 is connected to the controller (computer) through the signal cable. The condenser and the evaporator adopt the coil pipe mode.

[0041] In step 3, the exhaust end of the compressor 1 is also connected to the condenser 3 through the fourth pipeline 24, and the fourth pipeline 24 is provided with an oil-gas separator 6 and a first valve 71, and the first pipeline 21 is provided with a second valve 72. The exhaust end of the oil-gas separator 6 is sequentially connected with a third valve 73 and a first throttling unit 81, and the first throttling unit 81 in the embodiment is a capillary tube. When the third valve 73 is opened, the separated refrigerant oil is discharged through the first throttling unit 81, and the oil amount of the refrigerant oil discharged from the oil-gas separator 6 is adjusted through the first throttling unit 81.

[0042] In step 3, the second pipeline 22 is connected with a second throttling unit 82, and the second throttling unit 82 in the embodiment is a capillary tube. The gas pressure before entering the evaporator 4 is reduced through the second throttling unit 82.

[0043] In step 3, the second pipeline 22 is connected with a drying filter 9, and the gas is dried and filtered through the drying filter 9.

[0044] Step 4, mode selection

[0045] The compressor reliability test system is switched to the normal test mode or the limit test mode;

[0046] Normal test mode:

[0047] The first valve 71 is closed, and the second valve 72 is opened. The high-temperature and high-pressure gas at the exhaust end of the compressor 1 does not pass through the oil-gas separator 6, but directly enters the condenser 3. The circulation process from the condenser 3 to the suction end of the compressor 1 is the same as that in the limit test mode, and will not be described here.

[0048] Limit test mode:

[0049] The first valve 71 is opened, and the second valve 72 is closed. The high-temperature and high-pressure gas at the exhaust end of the compressor 1 first passes through the oil-gas separator 6 and then enters the condenser 3. The refrigerant oil separated from the oil-gas separator 6 is discharged through the third valve 73 and the first throttling unit 81, and does not enter the compressor reliability test system. The gas passing through the oil-gas separator 6 passes through the condenser 3 and the drying filter 9, and then flows through the second throttling unit 82 for pressure reduction. Finally, the gas passes through the evaporator 4 to further reduce the gas pressure, so that the suction pressure reaches the corresponding control requirement. In the limit test mode, the compressor 1 can be operated in an extreme working condition, which is used to simulate the reliability test that the refrigerant oil return is not timely during the operation of the compressor 1, resulting in insufficient oil supply capacity of the crankshaft of the compressor 1.

[0050] Step 5, reliability test

[0051] At the environment temperature corresponding to the most severe working condition point about 43℃, the starting duration and stopping time of the compressor are controlled by the controller, so that the value of the suction pressure gauge 52, the value of the discharge pressure gauge 51 and the shell temperature value reach the suction pressure value of the compressor about 0.43MPa a , the discharge pressure value about 2.45MPa a and the shell temperature value about 85℃ corresponding to the most severe working condition point, and the service life of the compressor 1 is tested.

[0052] So far, the present embodiment has been described in detail in combination with the drawings. According to the above description, those skilled in the art should have a clear understanding of the reliability test method of the compressor for refrigeration equipment of the present application. The reliability test method of the compressor for refrigeration equipment of the present application collects the most severe working condition point of the compressor according to the actual operation condition of the refrigeration equipment, builds a compressor reliability test system to test the reliability of the compressor, and the test result is more accurate and has universality. On this basis, an oil-gas separator is arranged on the compressor reliability test system, so that the compressor reliability test system can run in ordinary test mode and extreme test mode respectively. In the extreme test mode, the compressor can run in extreme condition, which is used for simulating the reliability test that the refrigeration oil is not returned in time during the operation of the compressor, resulting in insufficient oil supply capacity of the crankshaft of the compressor, so as to identify the weak point of the compressor design as soon as possible.

[0053] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only for specific embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of testing reliability of a compressor for a refrigerating apparatus, characterized by, The method comprises the following steps: Step 1, actual operation condition test of refrigeration equipment Start the refrigeration equipment according to the actual operation condition, and collect several groups of suction pressure and discharge pressure of the compressor during the operation of the refrigeration equipment; Step 2, determine the worst working condition point of the compressor Draw the pressure working condition diagram of the compressor according to the several groups of suction pressure and discharge pressure, and determine the worst working condition point of the compressor according to the pressure working condition diagram; the suction pressure value, the discharge pressure value, the shell temperature value and the environmental temperature value of the compressor corresponding to the worst working condition point are used as the test conditions of the reliability test in step 4; Step 3, build the reliability test system of the compressor Connect the discharge end of the compressor to the condenser through a first pipeline, connect the condenser to the evaporator through a second pipeline, connect the evaporator to the suction end of the compressor through a third pipeline, connect a discharge pressure gauge to the discharge end of the compressor, connect a suction pressure gauge to the suction end of the compressor, connect the start-stop control end of the compressor to the controller through a signal cable, and further connect the discharge end of the compressor to the condenser through a fourth pipeline, and an oil-gas separator and a first valve are arranged on the fourth pipeline, and a second valve is arranged on the first pipeline; Switch the reliability test system of the compressor to an ordinary test mode or an extreme test mode; Ordinary test mode: Close the first valve and open the second valve, so that the high-temperature and high-pressure gas at the discharge end of the compressor does not pass through the oil-gas separator but directly enters the condenser; Extreme test mode: Open the first valve and close the second valve, so that the high-temperature and high-pressure gas at the discharge end of the compressor first passes through the oil-gas separator and then enters the condenser, and the refrigerant oil separated out of the oil-gas separator is discharged and does not re-enter the reliability test system of the compressor; Step 4, reliability test Under the environmental temperature corresponding to the worst working condition point, control the start duration and stop time of the compressor by the controller, so that the value of the suction pressure gauge, the value of the discharge pressure gauge and the shell temperature value reach the suction pressure value, the discharge pressure value and the shell temperature value of the compressor corresponding to the worst working condition point, and the service life of the compressor is tested.

2. The reliability test method of the compressor for the refrigeration equipment according to claim 1, characterized in that: The discharge end of the oil-gas separator is connected with a first throttling unit, the separated refrigerant oil is discharged through the first throttling unit, and the oil amount of the refrigerant oil discharged from the oil-gas separator is adjusted through the first throttling unit.

3. The reliability test method of the compressor for the refrigeration equipment according to claim 1, characterized in that: In step 1, the electrical parameters and the temperature parameters during the operation of the compressor of the refrigeration equipment are also collected, whether the compressor of the refrigeration equipment operates normally is judged through the electrical parameters and the temperature parameters, and when the compressor of the refrigeration equipment operates normally, the collected several groups of suction pressure and discharge pressure data are valid.

4. The reliability test method of the compressor for the refrigeration equipment according to claim 1, characterized in that: In step 3, a second throttling unit is connected to the second pipeline, and the gas pressure before entering the evaporator is reduced through the second throttling unit.

5. The reliability test method of the compressor for the refrigeration equipment according to claim 1, characterized in that, In step 3, a drying filter is connected to the second pipeline, and the gas is dried and filtered through the drying filter.

6. The reliability test method for a compressor of a refrigeration device according to claim 1, characterized in that, In step 1, at least one complete defrosting control cycle during the operation of the compressor of the refrigeration device is collected.

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