Oil-gas separator performance testing device and method

Abstract

The invention discloses an oil-gas separator performance testing device and method, and the device comprises a regulation and control part, a testing part and a rear-end processing device which are sequentially arranged, and can solve the problems that in the prior art, an oil-gas separator performance test is relatively low in standardization and repeatability, relatively low in testing efficiency, relatively low in accuracy of a testing result and insufficient in reliability. The oil-gas separator performance test is standardized and repeatable, and the test efficiency and precision are improved.

Description

Technical Field

[0001] The invention relates to the field of measurement, and in particular to a performance testing device and method for an oil-gas separator. Background Art

[0002] During the operation of internal combustion engines such as gasoline or diesel engines, piston blowby will enter the crankcase, and these blowby gases often contain oil particles. If these oil particles are not separated from the mixed gas in time and returned to the oil pan, it will cause oil deterioration, corrosion of parts, and even excessive pressure in the crankcase, causing air leakage, oil leakage and other problems. Therefore, as an important component in the breathing system of the internal combustion engine, the performance of the oil-gas separator is directly related to the operating efficiency and life of the internal combustion engine.

[0003] Traditional oil-gas separator development methods are often based on engineering experience, and go through repeated design, testing, and design cycles, which not only increases the test cost, but also prolongs the development cycle. Traditional development methods make it difficult to comprehensively and accurately evaluate the performance of oil-gas separators under different working conditions, and it is difficult to meet the needs of modern internal combustion engines for efficient and reliable oil-gas separation. At present, in order to overcome the limitations of traditional development methods, modern testing technologies have been widely used, including but not limited to CFD (computational fluid dynamics) analysis, modular testing systems, etc., which provide a more scientific and accurate method for oil-gas separator performance testing. However, the current oil-gas separator performance test has a low degree of standardization and repeatability, a relatively low test efficiency, and insufficient accuracy and reliability of the test results. Its relevant standards and specifications need to be further improved and refined. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an oil-gas separator performance testing device and method, by which the problems of low standardization and repeatability of oil-gas separator performance tests, low relative test efficiency, low accuracy of test results and insufficient reliability in the prior art can be solved, so that standardization and repeatability of oil-gas separator performance tests can be achieved and test efficiency and accuracy can be improved.

[0005] The present invention provides an oil-gas separator performance test device, comprising a control unit, a test unit and a back-end processing device arranged in sequence:

[0006] The control unit is used for filtering, energy conversion processing, control pipeline switch control and mass flow control;

[0007] The test section is used to test the performance of the oil-gas separator; wherein the test section includes an upstream three-way solenoid valve, an upstream pressure measuring tube, an oil-gas separator, a downstream wall flow steam trap, a downstream pressure measuring tube, a midstream three-way solenoid valve, an oil-gas separator and a downstream three-way solenoid valve connected in sequence, the upstream three-way solenoid valve and the upstream pressure measuring tube passage are connected to a first particle size analyzer, and the downstream wall flow steam trap and the downstream pressure measuring tube passage are connected to a second particle size analyzer; wherein the upstream, midstream and downstream three-way solenoid valves are electrically connected together; the upstream three-way solenoid valve is connected to the control section, and the downstream three-way solenoid valve is connected to the back-end processing device;

[0008] Back-end processing equipment for pressure regulation and vacuum extraction.

[0009] Among them, the regulating part includes an absolute filter, a switch valve, a heat exchanger, a first mass flow controller MFC, an aerosol generator and a second mass flow controller MFC which are connected in sequence through a pipeline loop. The first mass flow controller MFC and the aerosol generator are connected to the pipeline connecting the inlet of the mixer, the outlet of the mixer is connected to the inlet of the upstream wall flow steam trap, and the outlet of the upstream wall flow steam trap is connected to the upstream three-way solenoid valve.

[0010] Wherein, the back-end processing device includes a pressure regulating device and a vacuum pump connected in sequence, and the pressure regulating device is connected to a downstream three-way solenoid valve.

[0011] Wherein, the back-end processing device includes a pressure regulating device and a vacuum pump connected in sequence, and the pressure regulating device is connected to a downstream three-way solenoid valve.

[0012] Among them, the control part is replaced by an engine, and the back-end processing device also includes a mass flow controller MFC, which is arranged between the pressure regulating device and the vacuum pump.

[0013] The present invention also provides a method for testing the performance of an oil-gas separator, comprising the following steps:

[0014] According to the preset conditions and standards, the oil-gas separator performance test device is set up to meet the test requirements;

[0015] The performance of the oil-gas separator is tested according to the preset test method;

[0016] After processing the data, complete the performance test report.

[0017] Among them, the preset test methods include tests that should include pressure loss, laboratory weight efficiency test, conditional weight efficiency test, crankcase pressure control test, emission interval test, engine weight efficiency test, laboratory fractional separation efficiency test, conditional fractional separation efficiency test, engine fractional separation efficiency test and engine aerosol distribution sampling test.

[0018] The pressure loss test is used to determine the pressure loss generated when air passes through the test part under predetermined conditions, and includes the following steps:

[0019] Set up the test section as required, seal all joints to prevent air leakage, connect the pressure measuring tube to the inlet and outlet of the device under test, and the size of the pressure measuring tube should be consistent with the inlet and outlet of the test section;

[0020] Record inlet temperature, air pressure, and relative humidity;

[0021] Measure and record the relationship between the differential pressure and the upstream absolute pressure of the device under test and at least four equally spaced gas flows or flow rates agreed upon by the customer and supplier;

[0022] Record the inlet temperature, air pressure, and relative humidity again, and calibrate the recorded differential pressure readings to standard conditions as required;

[0023] Measure the pressure loss and draw a pressure loss graph.

[0024] The laboratory weight efficiency test is used to determine the weight separation efficiency of the equipment under new and conditioned conditions, and includes the following steps:

[0025] Set the test duration to greater than 30 min, and the minimum mass obtained by the absolute filter to 1.0 g;

[0026] The weight changes of the components and the absolute filter during the test are used to calculate the weight efficiency of the new and conditional states;

[0027] When the new state is no longer maintained, the high-efficiency separator shall not exceed 3 hours to complete the efficiency evaluation of the product.

[0028] Weigh and record the device under test, weigh and record the drainage container;

[0029] Weigh the absolute filter and record the mass before assembly in the absolute filter housing;

[0030] Weigh the downstream wall trap of the device under test;

[0031] Set up a test bench for all aerosol separators and seal all connections to prevent air leaks.

[0032] Wherein, the laboratory weight efficiency test also includes the following steps:

[0033] Record the temperature, pressure and relative humidity of the air outside the test section;

[0034] Start the airflow of the test bench, stabilize it at the test flow rate according to the requirements of the air velocity measurement system, and record the pressure difference;

[0035] Setting the aerosol generator to a predetermined oil flow rate and starting the aerosol generator;

[0036] Compensate for the increase in differential pressure introduced by the oil pipe between the device under test and the pressure measuring tube and the downstream wall flow steam trap;

[0037] Use a downstream wall flow trap to prevent the liquid oil wall from flowing to the downstream pressure measuring tube, where the pressure loss of the downstream wall flow trap is subtracted from the total pressure loss;

[0038] Every 10 minutes, record the pressure difference and test time under the air test flow rate;

[0039] At the end of the test, record the pressure difference, interrupt the air flow or the aerosol generator oil flow, and remove the absolute filter;

[0040] Turn off the aerosol generator and continue to run it at air flow rate for 15s to 30s to exhaust the gas in the oil-gas separator test bench and stop the air flow;

[0041] Record the temperature, pressure and relative humidity of the air outside the test unit and weigh the device under test; the increase in mass of the tested component is the measured mass minus the recorded mass;

[0042] Remove the absolute filter and repeat the above steps to determine the mass difference;

[0043] Calculate the aerosol efficiency E a 、E T , P L , specifically:

[0044] Sol efficiency E a :

[0045]

[0046] Calculate the overall efficiency E Tx :

[0047]

[0048] Calculate the amount of liquid penetration per unit time P L , the method is as follows:

[0049]

[0050] The aerosol flow rate O is calculated by the following method m :

[0051]

[0052] Where:

[0053] E a - the efficiency of the unit under test;

[0054] t——test time, in hours;

[0055] E T1 - the total efficiency of the device under test, including liquid and aerosol;

[0056] E T2 - Overall efficiency of the engine weight test unit, including liquid and aerosol;

[0057] P L - liquid penetration of the device under test;

[0058] Δm u - mass increment of the unit under test;

[0059] Δm F - mass increase of absolute filters;

[0060] Δm D ——Increase in mass of downstream wall flow steam trap;

[0061] Δm d ——Increase in mass of leaking pipe;

[0062] Δm T - Increased quality of alternative methods that capture the total challenge, absolute filtering approach.

[0063] The oil-gas separator performance testing device and method of the present invention can solve the problems in the prior art of low standardization and repeatability of oil-gas separator performance tests, low relative test efficiency, low accuracy of test results and insufficient reliability, achieve standardization and repeatability of oil-gas separator performance tests, and improve test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a schematic diagram of the structure of the laboratory oil-gas separator performance test device;

[0065] Figure 2 Schematic diagram of aerosol mass distribution;

[0066] Figure 3 This is a schematic diagram of an engine oil-gas separator performance test device;

[0067] Explanation of reference numerals: 1 absolute filter; 2 switch valve; 3 heat exchanger; 4 mass flow controller (MFC); 5 wall flow trap; 6 three-way solenoid valve; 7 pressure measuring tube; 8 oil-gas separator; 9 particle size analyzer; 10 oil discharge device; 11 pressure regulating device; 12 vacuum pump DETAILED DESCRIPTION

[0068] The specific implementation of the present invention is described in detail below. It is necessary to point out that the following implementation is only used for further explanation of the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by persons skilled in the art based on the above-mentioned content of the present invention still fall within the scope of protection of the present invention.

[0069] The present invention provides a performance test device for an oil-gas separator, and its specific implementation method is as shown in the attached Figure 1-3 As shown, Figure 1 The figure is a schematic diagram of the structure of a laboratory oil-gas separator performance test device. The present invention also provides an oil-gas separator performance test method. The oil-gas separator performance test device and method flow are specifically introduced below.

[0070] The present invention provides a performance test device and method for an oil-gas separator, the specific structure and implementation process of which are shown in the attached drawings. Figure 1 As shown, the oil-gas separator performance testing device provided by the present invention includes a control part, a testing part and a back-end processing device which are arranged in sequence.

[0071] The control unit is used for filtering, energy conversion, pipeline switch control and mass flow control. Figure 1 As shown, the control unit includes an absolute filter, a switch valve, a heat exchanger, a first mass flow controller MFC, an aerosol generator and a second mass flow controller MFC which are connected in sequence through a pipeline loop. The first mass flow controller MFC and the aerosol generator are connected to the inlet of the mixer on the pipeline, and the outlet of the mixer is connected to the inlet of the upstream wall flow trap, and the outlet of the upstream wall flow trap is connected to the upstream three-way solenoid valve

[0072] The test section is used to test the performance of the oil-gas separator. Figure 1 As shown, the test section includes an upstream three-way solenoid valve, an upstream pressure measuring tube, an oil-gas separator, a downstream wall flow steam trap, a downstream pressure measuring tube, a midstream three-way solenoid valve, an oil-gas separator and a downstream three-way solenoid valve connected in sequence, the upstream three-way solenoid valve and the upstream pressure measuring tube passage are connected to a first particle size analyzer, and the downstream wall flow steam trap and the downstream pressure measuring tube passage are connected to a second particle size analyzer. Among them, the upstream, midstream and downstream three-way solenoid valves are electrically connected together. It should be noted that in the present invention, the upstream, midstream and downstream are only relatively set and do not represent the only flow direction.

[0073] Back-end processing device for pressure regulation and vacuum extraction. Figure 1 As shown, the back-end processing device includes a pressure regulating device and a vacuum pump connected in sequence, and the pressure regulating device is connected to a downstream three-way solenoid valve.

[0074] During oil and gas testing, the measuring equipment ensures the following accuracy:

[0075] The air flow rate is within ±5% of the reading.

[0076] The pressure difference is within the reading range of ±25pa.

[0077] The temperature is read within ±1.5°C.

[0078] Except for the absolute filter and downstream wall flow steam trap, the mass is controlled within 0.1g.

[0079] For absolute filters and downstream wall flow traps, the mass is controlled within 0.01g.

[0080] Relative humidity (RH), accuracy is ±2% RH.

[0081] The air pressure is controlled within ±3hpa.

[0082] The crankcase pressure reading is ±25pa.

[0083] RPM to maximum engine speed ±0.5%.

[0084] Torque within ±2% of operating torque

[0085] The leakage rate should be less than 1% of the air flow.

[0086] Specifically, the test oil used should have appropriate viscosity and surface tension, 50% of the particle size of the cumulative mass of the generated aerosol should be larger than 0.85μm and smaller than 0.90μm, and the generated aerosol should meet the requirements of Figure 2 The aerosol mass distribution is given.

[0087] The absolute filter should be stable at a temperature of not less than 105°C, and be resistant to oil, various fuels, water and other blowing components, and retain pollutants passing through the test part. In the preferred mode, the absolute filter is two absolute sub-filters connected in series, and the weight efficiency test is performed using a 0.60μm aerosol with a D50 of 1.5 μm. The mass increment of each absolute filter can be measured, and the absolute filter has a good separation efficiency for aerosols. Where Δm A - is the upstream absolute filter mass increment, Δm B- is the mass increment of the downstream absolute filter. Before the absolute filter material is verified, the mass increment of the upstream absolute filter should be greater than 1.0g, and the aerosol separation efficiency of the absolute filter should be no less than 97%. The measurement method of the absolute filter element of the absolute filter is: after the mass of the absolute filter is stable, until the mass variable is as small as 0.01g, the absolute filter is weighed, which is stored in a ventilated oven at a constant temperature of 65.5°C to achieve weight stabilization with moisture removal and minimal loss of volatile components, or the absolute filter is placed in a housing with controlled ambient temperature and humidity. The absolute filter is weighed in the same environment as at the beginning of the test, and the heated weighing is carried out in a closed heating chamber. When the absolute filter is actually weighed, it is carried out once a day for three consecutive days, and the variation between measurements does not exceed ±0.03g.

[0088] The wall flow steam trap is weighed in the same environment as at the beginning of the test after the mass stabilizes, until the mass variation is as small as 0.01g. The heated weighing should be carried out in a closed heating chamber. Two wall flow steam traps (upstream and downstream) are connected in series. At least 1g of test aerosol is added to the upstream wall flow steam trap to verify that the liquid oil separation efficiency of the set wall flow steam trap should be no less than 97%. Wall flow steam trap liquid oil separation efficiency Where Δm c is the mass increase of the upstream wall flow steam trap, Δm D The mass increase of the downstream wall flow steam trap is used to obtain the aerosol efficiency value using the specified aerosol. The test apparatus shall include an oil mist generator, a wall flow steam trap and an absolute filter for measuring the aerosol. The absolute filter shall meet the same test environment requirements as the absolute filter. During this efficiency test, the wall flow steam trap shall withstand at least 3g of oil aerosol. The efficiency of the wall flow steam trap shall be less than 1%.

[0089] The upstream wall flow steam trap eliminates the wall flow oil entering the inlet pipe, and the downstream wall flow steam trap eliminates any wall flow of oil. The mass flow controller MFC, whose data sampling frequency is not less than 2Hz, can control the actual flow rate within ±5% of the set flow value; when the compressed air / blower is used to control the system airflow, its flow and pressure characteristics are sufficient to meet the actual working conditions of the oil-gas separator to be tested. In the preferred mode, if the engine cannot produce the required blowby flow, compressed air / blower can be used to induce air to flow through the system to fully produce the flow and pressure characteristics of the oil-gas separator to be tested. And the flow fluctuation should be as small as possible to the extent that the flow measurement system cannot measure it.

[0090] For the engine weight test, if the pressure drop between the downstream components of the UUT (test unit) and the environment is greater than 100pa, the system should use a downstream blower to adjust the outlet pressure of the UUT. For the engine fractional separation efficiency test, if the pressure drop between the downstream components of the UUT and the environment is greater than 500pa, and it is proven that the pressure drop affects the particle size upstream and / or downstream of the UUT (unit under test), the system should use a downstream blower to adjust the outlet pressure of the UUT. All test equipment and pipeline housings should be grounded to reduce the impact of static electricity and improve the consistency of test results.

[0091] For aerosol sampling, a transport of >95% of particles with a diameter of 3 μm can be provided from the sample probe inlet in the test duct to the particle size measuring instrument inlet, verified by experimental measurement or numerical calculation based on the geometry of the sampling system, the sampling flow rate and the particle deposition related to diffusion, sedimentation, turbulence and inertial forces. Use a sampling system to optimize the transfer of particles from the inlet probe to the particle instrument, where the sampling system should meet the following criteria:

[0092] a) The cross-sectional area of ​​the sampling tube in the air duct should be less than 25% of the cross-sectional area of ​​the air duct.

[0093] b) For the set UUT flow rate, the inlet nozzles of the upstream and downstream sampling probes should have sharp edges (angle

[0094] <15°, the inlet diameter should be appropriate, and the sampling should be kept constant at the test airflow rate (between +0% and -10%).

[0095] range).

[0096] c) The sampled air flow rate should be considered in the total flow rate (e.g. 3 l / min sampled at a rated flow rate of 30 l / min).

[0097] d) The upstream and downstream sampling systems should be of equal length and geometry.

[0098] e) When the sampling system flow is greater than or equal to 20% of the system air volume, the downstream particle counting system flow compensation should account for the flow through the particle size analyzer to maintain a constant flow of the UUT.

[0099] f) The position of auxiliary components (i.e. wall traps) should not change the particle distribution and needs to be verified by measurement.

[0100] g) The user should verify the dilution factor to ensure that the dilution does not change the particle distribution.

[0101] h) The sampling probe should be located on the center line of the test pipeline, and the sampling point should be 4 and 7 times the diameter of the straight pipe section away from any elbows upstream and downstream respectively.

[0102] i) The connection length between the particle size measuring instrument and the sampling probe is short to avoid bending of the sampling pipeline (if bending is necessary, there should be no sharp angles).

[0103] For particle size measuring instruments, the particle size measuring instruments used to measure the size and concentration of aerosol particles should meet the following standards:

[0104] a) Particles with diameters between 0.3 μm and 5 μm should be measured and grouped into at least 8 channels.

[0105] b) When the particle analyzer is used with PSL particles having a monodisperse diameter of 1.0 μm, at least 90% of the observed counts are between 0.7 μm and 1.3 μm.

[0106] c) At least 50% counting efficiency at 0.3 μm.

[0107] d) There should be less than 10% overlap error during the measurement process.

[0108] e) Install a high-efficiency air particle filter at the inlet of the particle size measuring instrument, measuring no more than 10 particles per minute in the range of 0.30μm to 5μm.

[0109] f) The particle meter should be calibrated to measure oil particles.

[0110] Combined with Figure 3 As shown, the present invention provides an oil-gas separator performance testing device. In a preferred embodiment, the control unit is replaced by an engine, and the back-end processing device also includes a mass flow controller MFC, which is arranged between the pressure regulating device and the vacuum pump.

[0111] The present invention also provides a method for testing the performance of an oil-gas separator, which is implemented using the above-mentioned oil-gas separator performance testing device. A method for testing the performance of an oil-gas separator comprises the following steps:

[0112] First, according to the preset conditions and standards, the oil-gas separator performance test device is set up to meet the test requirements.

[0113] Secondly, the performance of the oil-gas separator is tested according to a preset test method; wherein the preset test method includes at least one of the tests including pressure loss, laboratory weight efficiency test, conditional weight efficiency test, crankcase pressure control test (when there is a pressure regulator), emission interval test (when applicable), engine weight efficiency test, laboratory fractional separation efficiency test, conditional fractional separation efficiency test (when applicable), engine fractional separation efficiency test and engine aerosol distribution sampling test. The performance test of the complete oil-gas separator includes all of the above tests.

[0114] 7.2 Pressure loss test

[0115] 7.2.1 The purpose of this test is to determine the pressure loss produced when air passes through the device under test under predetermined conditions. The airflow differential pressure is measured with a clean aerosol separator with at least four equally spaced airflows or as agreed upon by the customer and supplier.

[0116] 7.2.2 Set up the UUT. Seal all connections to prevent air leaks. Connect the pressure gauge tubes to the inlet and outlet of the device under test. The size of the pressure gauge tube should be consistent with the inlet and outlet size of the UUT.

[0117] During pressure loss testing, care should be taken to understand product components that may affect the flow path, such as pressure regulators.

[0118] 7.2.3 Record inlet temperature, air pressure and relative humidity.

[0119] 7.2.4 Measure and record the relationship between the differential pressure and the upstream absolute pressure of the device under test and at least four equally spaced gas flows or flow rates agreed upon by the customer and supplier.

[0120] 7.2.5 Record inlet temperature, air pressure and relative humidity.

[0121] 7.2.6 The recorded differential pressure readings shall be calibrated to standard conditions as required.

[0122] 7.2.7 When determining pressure loss, use the preset formula.

[0123] 7.2.8 Draw a pressure loss diagram.

[0124] Among them, the pressure difference and pressure loss under standard conditions are corrected as follows:

[0125] Report the air flow pressure difference and pressure loss at standard conditions of 20°C and 101.3 kPa (1013 mbar).

[0126] The pressure difference or pressure loss Δp of the separator can be expressed as follows:

[0127] Δp=K1μV+K2pV 2

[0128] Where:

[0129] K1——empirical constant;

[0130] K2——empirical constant;

[0131] μ——dynamic viscosity, unit is MPa.s;

[0132] ρ——air density, unit is kg / m 3 ;

[0133] V——Volume flow rate, in m 3 / min;

[0134] m——mass flow rate, the unit is kg / min.

[0135] use Substituting V gives:

[0136]

[0137] Rearranging the terms gives:

[0138] ρΔp=K1μm+K2ρm 2

[0139] By keeping the mass flow rate constant and limiting the inlet temperature variation to keep the viscosity variation small, ρΔp will remain constant:

[0140] ρ0Δp0)=ρ△p

[0141]

[0142] The subscript 0 in the formula indicates standard conditions.

[0143] Barometric and gauge pressure calibration method: When using barometric pressure sensors and gauge pressure sensors at the part inlet, calibrate the observed differential pressure and pressure loss values ​​to standard conditions.

[0144]

[0145] Where:

[0146] p – observed inlet pressure;

[0147] p i - the pressure measured at the inlet of the device under test;

[0148] t——the inlet temperature of the unit under test;

[0149] Δp d orΔp l ——Measured separator pressure difference or pressure loss.

[0150] Absolute pressure correction method: When an absolute pressure sensor is used at the inlet of the device under test, the observed pressure difference and pressure loss values ​​are corrected to standard conditions.

[0151]

[0152] Where:

[0153] t——the inlet temperature of the unit under test;

[0154] p a - absolute pressure measured at the inlet of the device under test;

[0155] Δp d orΔp l ——Measured separator pressure difference or pressure loss.

[0156] 7.3 Laboratory Gravimetric Efficiency Test

[0157] 7.3.1 The purpose of the gravimetric efficiency test is to determine the gravimetric separation efficiency of the equipment under two conditions:

[0158] a) New state;

[0159] b) Conditional status, as described in 7.4.

[0160] The test duration for the gravimetric efficiency test shall be at least 30 minutes and the minimum mass gained by the absolute filter shall be 1.0 g. Additional time may be required to achieve the required absolute filter weight gain. The weight change of each component during the test and the weight change of the absolute filter are used to calculate the new and conditional gravimetric efficiencies.

[0161] For 7.3.1a), high efficiency separators shall not exceed 3h when no longer in a new state. For such separators, 7.4 and 7.5 shall be performed to complete the efficiency evaluation of the product and shall meet the above minimum requirements of 30min and 1.0g for absolute filters.

[0162] Note: Higher efficiency separators may require additional time to achieve the specified absolute filter weight gain requirements.

[0163] 7.3.2 The mass oil flow rate shall be agreed upon by the user and the manufacturer.

[0164] It should be noted that large amounts of oil flow may affect the aerosol size distribution.

[0165] 7.3.3 Weigh and record the device under test.

[0166] 7.3.4 Weigh and record the drainage container (if any).

[0167] 7.3.5 Weigh the absolute filter and record the mass before assembling it in the absolute filter housing.

[0168] 7.3.6 Weigh the downstream wall trap of the device under test.

[0169] 7.3.7 Set up a test bench for all aerosol separators. Seal all joints to prevent air leakage. The orientation of the device under test should be the same as in use.

[0170] During pressure loss testing, care should be taken to understand product components that may affect the flow path, such as pressure regulators.

[0171] 7.3.8 Record the temperature, pressure, and relative humidity of the air outside the UUT.

[0172] 7.3.9 Start the air flow of the test bench and stabilize it at the test flow rate as specified by the air velocity measurement system with the required accuracy. Record the pressure difference.

[0173] 7.3.10 Set the aerosol generator to the predetermined oil flow rate and start the aerosol generator.

[0174] 7.3.11 Since the downstream wall flow trap will be located in this area, the increase in pressure differential introduced by the oil pipe between the device under test and the piezometric tube and the downstream wall flow trap should be compensated. The presence of the downstream wall flow trap prevents the liquid oil wall from flowing to the downstream piezometric tube. The pressure loss of the downstream wall flow trap should be subtracted from the total pressure loss.

[0175] 7.3.12 Every 10 minutes, record the pressure difference at the air test flow rate and the test time.

[0176] 7.3.13 At the end of the test, record the pressure difference, then interrupt the air flow or aerosol generator oil flow and remove the absolute filter.

[0177] 7.3.14 Turn off the aerosol generator and continue to run it at air flow rate for 15s to 30s to exhaust the gas in the oil-gas separator test bench.

[0178] 7.3.15 Stop the air flow.

[0179] 7.3.16 Record the temperature, pressure, and relative humidity of the air outside the UUT.

[0180] 7.3.17 Weigh the device under test. Note any evidence of seal leakage or abnormality. The increase in mass of the part under test is the measured mass minus the mass recorded in 7.3.3.

[0181] NOTE: Weigh all parts carefully to avoid losing any oil mass.

[0182] 7.3.18 Remove the absolute filter. Repeat 7.3.5 and determine the mass difference. The difference is the aerosol penetration capacity of the device under test. The minimum mass obtained on the absolute filter should be 0.1 g.

[0183] 7.3.19 Reweigh the downstream wall steam trap. The mass increment of the downstream wall steam trap is the mass minus the mass recorded in 7.3.6.

[0184] 7.3.20 Reweigh the drain container. The increase in mass of the drain is the mass minus the mass recorded in 7.3.4.

[0185] 7.3.21 Calculate the aerosol efficiency E a 、E T , P L .

[0186] For weight efficiency data processing, it is used to determine the weight separation efficiency. The device should be operated at the specified air flow and oil flow, and the weight efficiency is calculated by testing the weight change of each component and absolute filter during use. The weight increase of the absolute filter after the weight efficiency test should be greater than 0.05g.

[0187] The sol efficiency E a :

[0188]

[0189] Calculate the overall efficiency E Tx :

[0190]

[0191] NOTE: Using the calculation for total efficiency in engine weight tests only, if a wall flow trap is not used, the aerosol efficiency cannot be measured and only the total efficiency can be recorded.

[0192] Calculate the amount of liquid penetration per unit time P L , the method is as follows:

[0193]

[0194] The aerosol flow rate O is calculated by the following method m :

[0195]

[0196] Where:

[0197] E a - the efficiency of the unit under test;

[0198] t——test time, in hours;

[0199] E T1 - the overall efficiency of the device under test (liquid and aerosol);

[0200] E T2 - Overall efficiency of the engine weight test unit (liquid and aerosol);

[0201] P L - liquid penetration of the device under test;

[0202] Δm u - mass increment of the unit under test;

[0203] Δm F - mass increase of absolute filters;

[0204] Δm D ——Increase in mass of downstream wall flow steam trap;

[0205] Δm d ——Increase in mass of leaking pipe;

[0206] Δm T - Increased quality of alternative methods (absolute filtering methods) that capture total challenge.

[0207] 7.4 Adjustment of the separation device before the conditional weight efficiency test

[0208] 7.4.1 After achieving the weight efficiency specified in 7.3, the oil separator shall be serviced before running 7.5. The specified aerosol shall be used for the conditioning portion. The objective of this test is to condition the oil separator to a state that represents the engine's operating conditions for the majority of the time.

[0209] 7.4.2 Perform this test according to the steps in 7.3.2 to 7.3.20.

[0210] 7.4.3 After inputting the total oil mass (in grams) equal to at least 50% of the medium volume, verify whether the device under test is continuously discharging oil. Once the device under test is continuously discharging oil, the change in pressure loss should not exceed 100 Pa within 3 hours.

[0211] 7.4.4 Once the separation device has reached the conditions specified in 7.4.3, calculate the total challenge aerosol mass Δm T , respectively, as in 8.1.2. As specified, record the total amount of aerosol from the UUT during the conditioning process. Continue with 7.5.

[0212] 7.4.5 If the unit under test is an inertial separator, test using 7.3 until oil leakage is observed. This efficiency shall be using an inertial separator with the conditions of 7.5 recorded.

[0213] 7.4.6 If the device under test is a combination of splitter technologies or methods, adjustments for the combined splitter shall be used as per 7.4.1 to 7.4.4.

[0214] 7.5 Conditional weight efficiency test

[0215] 7.5.1 The purpose of the gravimetric efficiency test is to determine the gravimetric separation efficiency of the device under the two conditions described in 7.3.1.

[0216] The test duration for the gravimetric efficiency test shall be at least 30 minutes and the minimum mass gained by the absolute filter shall be 1.0 g. Additional time may be required to achieve the required absolute filter weight gain. The weight change of each component during the test and the weight change of the absolute filter are used to calculate the gravimetric efficiency of the new condition.

[0217] Note: Higher efficiency separators may require additional time to achieve the specified absolute filter weight gain requirements.

[0218] 7.5.2 Perform this test in accordance with 7.3.2 to 7.3.20

[0219] 7.5.3 Calculate the aerosol efficiency E separately a ,E T ,P L .

[0220] 7.6 Crankcase pressure control test

[0221] 7.6.1 The purpose of this test is to determine the relationship between the crankcase (inlet) and the intake (outlet) as the outlet vacuum pressure is swept. This test is intended to record the pressure changes as a function of the pressure regulating device.

[0222] 7.6.2 Install the aerosol separator system with built-in pressure regulator or independent pressure regulator on the test bench as required.

[0223] 7.6.3 If the oil drain port is outside, please plug the oil drain port.

[0224] 7.6.4 Record inlet temperature, pressure and humidity.

[0225] 7.6.5 The relationship between inlet and outlet pressures and air flow is mapped as follows.

[0226] a) Start the air flow through the test bench and stabilize it at the specified test flow rate.

[0227] b) Record the inlet pressure as follows: 0~-8kPa, increment 1kPa. The pressure readings shall be corrected as specified.

[0228] 7.6.6 Repeat 7.6.5 for flow rates of approximately 50%, 100%, 150%, and 200% of the rated air flow.

[0229] 7.7 Oil drain interval test

[0230] 7.7.1 When operating a closed crankcase ventilation system, the separator outlet is exposed to varying degrees of vacuum due to the restriction of the intake filter. To prevent oil backflow through the separator return oil connection, the CCV system pressure differential, plus the head of the collected oil, should always exceed this outlet depression. In some cases, the solution to this situation is to install a check valve on the return oil connection to allow intermittent discharge of separated oil only under low vacuum conditions.

[0231] The purpose of this procedure is to determine and report the oil storage capacity of the above separator types so that the maximum oil drain interval can be calculated at any given oil mass separation rate. The determined oil drain intervals should be adhered to to allow the CCV equipment to be drained periodically when performing any of the verification tests specified in this document, including testing aerosol mass flow rate.

[0232] In the tests carried out using the laboratory method, the turbine and intake air interaction is replicated by the suction force generated by a flow pump.

[0233] In this process, the oil storage capacity will be defined as the volume of oil that can be collected before the measurable separation performance of the equipment is reduced.

[0234] 7.7.2 The oil flow rate shall be agreed upon by the user and the manufacturer.

[0235] 7.7.3 Weigh and record the device under test.

[0236] 7.7.4 Weigh and record the oil discharge container.

[0237] 7.7.5 Set up a test stand for all aerosol separators. Seal all connections to prevent air leaks. The aerosol separator unit shall have all drain components on the engine, including check valves, orifices, actual oil line lengths, etc., to accurately represent the oil drain configuration installed on the product. If the unit under test cannot be accurately weighed, the oil drain container shall only be used to quantify the amount of oil contained in the test.

[0238] 7.7.6 Record inlet temperature, pressure and humidity.

[0239] 7.7.7 Start the airflow of the test bench as required, stabilize it at the test flow rate as required, and record the pressure difference.

[0240] 7.7.8 Set the aerosol generator to the predetermined oil flow rate. Start the aerosol generator.

[0241] 7.7.9 Continue filling with test aerosol until the oil residue measurement reaches the customer-specified quality limit or until obvious signs of oil residue are observed.

[0242] NOTE: A clear oil line may be used to aid in visual confirmation of the drain oil level.

[0243] 7.7.10 Turn off the aerosol generator and continue to run it at air flow rate for 15s to 30s to exhaust the gas in the oil-gas separator test bench.

[0244] 7.7.11 Stop the air flow.

[0245] 7.7.12 Record the inlet temperature, pressure and relative humidity.

[0246] 7.7.13 Weigh the unit under test and make sure it does not leak oil. Note any evidence of seal leakage or abnormality. The increase in mass of the unit under test is the mass minus the mass recorded in 7.7.3.

[0247] NOTE: Weigh all parts carefully to avoid losing any oil or mass.

[0248] 7.7.14 If the device under test cannot be weighed, drain the oil in the device under test into the oil drain container. Reweigh the drain pipe. The increase in the mass of the drain pipe is the mass minus the mass recorded in 7.7.4.

[0249] 7.7.15 Calculate the oil storage mass M according to formula (6) s :

[0250] According to formula (6), the oil storage mass M is calculated s :

[0251] M s =Δm u +Δm d (6

[0252] The oil storage volume V is calculated by formula (7): s :

[0253]

[0254] The maximum oil discharge interval I is calculated by formula (8): s :

[0255]

[0256] Where:

[0257] M s ——Oil storage capacity of the unit under test, in mass (g);

[0258] V s ——Oil storage capacity of the unit under test (ml);

[0259] Δm u - mass increment of the unit under test;

[0260] Δm d ——Increase in mass of oil discharge pipe;

[0261] ρ——density of specified oil;

[0262] O m ——Mass oil flow rate per unit time of the measured unit.

[0263] 7.8 Engine weight efficiency test

[0264] 7.8.1 The objective is to determine the gravimetric separation efficiency of an engine mounted aerosol separator. The gravimetric efficiency is calculated using the weight change of the component parts and the absolute filter over the time period. Another method of capturing the test aerosol is to collect all the mass on the absolute filter by removing the unit under test and the downstream wall flow trap.

[0265] Note 1: Mass increases of more than 0.5 g have been shown to improve the reliability of engine weight efficiency tests.

[0266] NOTE 2: The blowby rate depends on the engine operating conditions for that particular engine.

[0267] 7.8.2 Weigh and record the device under test.

[0268] 7.8.3 If applicable, weigh and record the drain container.

[0269] 7.8.4 Weigh the absolute filter as specified and record the mass before installation in the absolute filter housing.

[0270] 7.8.5 Weigh the downstream wall flow steam trap of the device under test as specified.

[0271] 7.8.6 Set up a test bench for all aerosol separators and seal all joints to prevent air leakage.

[0272] 7.8.7 Confirm and record the required oil level, oil running time, engine running time and ambient temperature, pressure and humidity.

[0273] 7.8.8 Start the engine and bring it to the RPM and load conditions as specified, or begin measurements at a specific RPM and load, recording the oil temperature, blow-by temperature, differential pressure and crankcase pressure.

[0274] Note 1: Before this step, the engine should be preheated under the conditions specified by the customer.

[0275] NOTE 2 Before the gravimetric efficiency test is started, certain precautions should be taken to minimize exposure of the equipment being weighed, such as incorporating a bypass valve system.

[0276] 7.8.9 Since the downstream wall flow steam trap will be located in this area, the pressure difference increase caused by the oil pipe between the device under test and the pressure measuring tube and the downstream wall flow steam trap should be compensated. The downstream wall flow steam trap exists to protect the downstream pressure measuring tube from contamination by the wall flow of liquid oil.

[0277] 7.8.10 Record the oil temperature, blow-air temperature, differential pressure, crankcase pressure and running test time under engine operating conditions every 10 minutes.

[0278] 7.8.11 Record the pressure difference at the end of the test.

[0279] 7.8.12 Stop the engine or measuring system.

[0280] 7.8.13 Record the ambient temperature, pressure and relative humidity.

[0281] 7.8.14 Carefully weigh the unit under test. No oil should leak. Take care to record any evidence of seal leakage or abnormal conditions. Weighing units. The mass increment of the unit under test is the mass minus the mass recorded in 7.8.2.

[0282] 7.8.15 Carefully remove the absolute filter. Repeat step 7.8.4 to determine the mass difference.

[0283] 7.8.16 If applicable, reweigh the downstream wall-flow steam trap. The mass increment of the downstream wall-flow steam trap is the mass minus the mass recorded in 7.8.5.

[0284] 7.8.17 Reweigh the drain container. The increase in the mass of the drain pipe is the mass minus the mass recorded in 7.8..3.

[0285] 7.8.18 Calculate the aerosol efficiency, E a , and P L .

[0286] 7.8.19 Results shown in the report

[0287] 7.9 Laboratory fractionation efficiency test

[0288] 7.9.1 Test sequence and sampling sequence

[0289] Table 1 shows the test sequence of fractionation efficiency in new state or conditional state, and Table 2 shows the sampling sequence of particle size analyzer.

[0290] Sample counts within each size range should be processed in the same manner and all fractional efficiency tests should follow this pattern. The initial upstream sample should be followed by an upstream-to-downstream purge. The first downstream sample should be followed by a downstream-to-upstream purge and then another upstream sample. The final four stages should be repeated for the required number of samples.

[0291] Table 1 - Sequence of testing for fractionation efficiency in new or conditioned state

[0292] Serial number Test Type Device under test Aerosol Generator Particle size analyzer 1 Background count 1 Blank pipe or empty housing close open 2 Relevance Blank pipe or empty housing open open 3 Background count 2 Blank pipe or empty housing close open 4 Background count 3 Oil and gas separator close open 5 Fractionation efficiency Oil and gas separator open open 6 Background count 4 Oil and gas separator close open

[0293] Table 2 - Particle size analyzer sampling sequence

[0294]

[0295] 7.9.2 Laboratory Fractionation Efficiency Test Process

[0296] 7.9.2.1 Record the temperature, relative humidity, and air pressure at the beginning and end of each test. Monitor the temperature and relative humidity continuously throughout the test.

[0297] 7.9.2.2 Install a blank duct or component housing in the test system in place of the test device. Set the specified volume flow rate and measure and record the skin pressure loss, background count, and correlation ratio. Refer to Items 1, 2, and 3 in Table 1. Refer to Section 7.9.1 for sampling sequence, number of samples required, calculation method, and criteria for accepting background count and correlation ratio data.

[0298] 7.9.2.3 Connect the oil-gas separator to be tested. The installation direction of the oil-gas separator should be the same as when it is installed on the vehicle.

[0299] 7.9.2.4 Set the specified air volume. During the entire test, the volume flow rate should be maintained within ±2% of the specified value.

[0300] 7.9.2.5 Measure the background count according to item 4 of Table 1.

[0301] 7.9.2.6 Measure and record the pressure loss (Δp l ).

[0302] 7.9.2.7 Start the aerosol generator at the determined flow rate.

[0303] 7.9.2.8 After allowing the upstream and downstream aerosol concentrations to stabilize, measure the fractional efficiency of the UUT. Refer to 7.9.1 for sampling sequence, number of samples required. The criteria for calculation and acceptance of data shall be such that efficiency curves shall be plotted for any or all particle size ranges of the test program. Efficiency measurements shall be made at 50% and 100% of the flow rate specified by the customer or requestor or at such flow rate points as may be agreed upon with the customer.

[0304] 7.9.2.9 Turn off the aerosol generator and measure the background count as required.

[0305] 7.9.2.10 Feed the oil aerosol into the oil-gas separator at the specified flow rate until the oil-gas separator reaches the second test condition.

[0306] 7.9.2.11 Measure and record the pressure loss (Δp l ).

[0307] 7.9.2.12 Turn off the aerosol generator and measure the background count.

[0308] 7.9.2.13 Start the aerosol generator. Allow the upstream and downstream aerosol concentrations to stabilize and then measure the fractional efficiency of the UUT. Refer to Section 7.9.1 for sampling sequence, number of samples required, calculations, and criteria for accepting data. Efficiency curves shall be constructed for all particle size ranges of the test program. Efficiency measurements shall be made at 10%, 50%, 100%, and 200% of the flow rate specified by the customer or requester.

[0309] 7.9.2.14 Turn off the aerosol generator.

[0310] 7.9.2.15 Measure background counts.

[0311] 7.9.2.16 Measure and record temperature, relative humidity and air pressure.

[0312] 7.9.2.17 Report the results as shown in Appendix E or equivalent.

[0313] 7.10 Engine fractional separation efficiency test

[0314] 7.10.1 Test sequence and sampling sequence

[0315] Table 3 shows the test sequence of engine fractionation efficiency, and the sampling sequence of particle size analyzer is shown in Table 2.

[0316] Table 3 - Engine fractional separation efficiency test sequence

[0317] Serial number Test Type Device under test Aerosol Generator Particle size analyzer 1 Relevance Blank pipe or empty housing open open 2 Fractionation efficiency Oil and gas separator open open

[0318] 7.10.2 Engine fractional separation efficiency test process

[0319] 7.10.2.1 The objective is to determine the fractional separation efficiency of an oil / gas separator installed on an engine. The fractional separation efficiency is calculated using particle counts upstream and downstream of the separator.

[0320] NOTE 1: The blowby rate depends on the engine operating conditions for that particular engine.

[0321] Note 2: When measuring particle size with a closed-loop system, care should be taken that the measurement results do not become unstable due to the influence of negative pressure.

[0322] 7.10.2.2 Set up a test bench for all aerosol separators and seal all joints to prevent air leakage.

[0323] 7.10.2.3Install a blank pipe or component housing in the test system in place of the test device. Start the engine, set the specified speed and torque, and measure and record the tare pressure loss and related ratios.

[0324] 7.10.2.4 Install the separator assembly or separator element in its respective test housing. The test separator assembly shall be installed in the same orientation as on the vehicle.

[0325] 7.10.2.5 Verify and record the required oil level, oil running time, engine running time and ambient temperature, pressure and humidity.

[0326] 7.10.2.6 Start and allow the engine to reach the RPM and load conditions, or begin measurements at a specific RPM and load. Record oil temperature, blow-off temperature, differential pressure, and crankcase pressure.

[0327] Note: Prior to this step, the engine should be preheated according to the conditions specified by the customer.

[0328] 7.10.2.7 The operator shall compensate for any increase in differential pressure exceeding 500 Pa caused by the tubing between the device under test and the piezometric tube and the downstream wall flow steam trap. The operator may also modify the settings to reduce the differential pressure.

[0329] 7.10.2.8 After adjusting the aerosol separator, run it for at least 15 minutes.

[0330] 7.10.2.9 Measure and record the pressure loss (Δp l ).

[0331] 7.10.2.10 Make the upstream and downstream aerosol concentrations as stable as possible and measure the classification efficiency.

[0332] 7.10.2.11 Stop the engine or measuring system.

[0333] 7.10.2.12 Measure and record temperature, relative humidity and air pressure.

[0334] 7.10.2.13 Calculate the efficiency E according to the formula.

[0335] 7.11 Engine Aerosol Sampling Procedure

[0336] 7.11.1 The intent is to provide the user with a method for sampling aerosols directly from the engine crankcase.

[0337] 7.11.2 Set up the test bench and seal all joints to prevent air leakage.

[0338] 7.11.3 Verify and record the required oil level, oil running time, engine running time and ambient temperature, pressure and humidity.

[0339] 7.11.4 Install the correct isokinetic sampling port.

[0340] 7.11.5 Start and allow the engine to reach the RPM and load conditions, or begin measurement at a specific RPM and load. Record oil temperature, blow air temperature, blow air flow, differential pressure, and crankcase pressure.

[0341] Note 1: Before this step, the engine should be preheated under the conditions specified by the customer.

[0342] NOTE 2: The operator will record the flow, RPM and load conditions of the engine, sample the blown particles, then sample the distribution without using the flow meter readings and use the engine conditions to relate the two.

[0343] 7.11.6 Once the engine is stable, the user should sample for as long as necessary to obtain at least 500 particle counts in all significant channel sizes. Record the distribution.

[0344] NOTE: Channels indicating a particle count of less than 500 should be ignored.

[0345] 7.11.7 Stop the engine and measuring system.

[0346] 7.11.8 Measure and record temperature, relative humidity and air pressure.

[0347] Finally, after processing the data, the performance test report is completed.

[0348] Although exemplary embodiments of the present invention have been described for the purpose of illustration, it will be understood by those skilled in the art that various modifications, additions and substitutions may be made in form and detail without departing from the scope and spirit of the invention disclosed in the appended claims, and all such changes shall fall within the scope of protection of the appended claims of the present invention, and the various steps in the various departments and methods of the products claimed by the present invention may be combined together in any combination. Therefore, the description of the embodiments disclosed in the present invention is not intended to limit the scope of the present invention, but is used to describe the present invention. Accordingly, the scope of the present invention is not limited by the above embodiments, but is defined by the claims or their equivalents.

Claims

1. An oil-gas separator performance test device, comprising a control unit, a test unit and a back-end processing device arranged in sequence, characterized in that: The control unit is used for filtering, energy conversion processing, control pipeline switch control and mass flow control; The test section is used to test the performance of the oil-gas separator; wherein the test section includes an upstream three-way solenoid valve, an upstream pressure measuring tube, an oil-gas separator, a downstream wall flow steam trap, a downstream pressure measuring tube, a midstream three-way solenoid valve, an oil-gas separator and a downstream three-way solenoid valve connected in sequence, the upstream three-way solenoid valve and the upstream pressure measuring tube passage are connected to a first particle size analyzer, and the downstream wall flow steam trap and the downstream pressure measuring tube passage are connected to a second particle size analyzer; wherein the upstream, midstream and downstream three-way solenoid valves are electrically connected together; the upstream three-way solenoid valve is connected to the control section, and the downstream three-way solenoid valve is connected to the back-end processing device; Back-end processing equipment for pressure regulation and vacuum extraction.

2. The device according to claim 1, characterized in that: The regulating part includes an absolute filter, a switch valve, a heat exchanger, a first mass flow controller MFC, an aerosol generator and a second mass flow controller MFC which are connected in sequence through a pipeline loop. The first mass flow controller MFC and the aerosol generator are connected to the pipeline connecting the inlet of the mixer, the outlet of the mixer is connected to the inlet of an upstream wall flow trap, and the outlet of the upstream wall flow trap is connected to an upstream three-way solenoid valve.

3. The device according to claim 2, characterized in that: The back-end processing device comprises a pressure regulating device and a vacuum pump which are connected in sequence, and the pressure regulating device is connected to a downstream three-way solenoid valve.

4. The device according to claim 3, characterized in that: The back-end processing device comprises a pressure regulating device and a vacuum pump which are connected in sequence, and the pressure regulating device is connected to a downstream three-way solenoid valve.

5. The device according to any one of claims 1 to 4, characterized in that: The control unit is replaced by an engine, and the back-end processing device also includes a mass flow controller MFC, which is arranged between the pressure regulating device and the vacuum pump.

6. A method for testing the performance of an oil-gas separator, implemented using the device according to any one of claims 1 to 5, characterized in that: The steps include: According to the preset conditions and standards, the oil-gas separator performance test device is set up to meet the test requirements; The performance of the oil-gas separator is tested according to the preset test method; After processing the data, complete the performance test report.

7. The method according to claim 6, characterized in that: The preset test methods include tests such as pressure loss, laboratory weight efficiency test, conditional weight efficiency test, crankcase pressure control test, emission interval test, engine weight efficiency test, laboratory fractional separation efficiency test, conditional fractional separation efficiency test, engine fractional separation efficiency test and engine aerosol distribution sampling test.

8. The method according to claim 7, characterized in that: The pressure loss test is used to determine the pressure loss generated when air passes through the test section under predetermined conditions, and includes the following steps: Set up the test section as required, seal all joints to prevent air leakage, connect the pressure measuring tube to the inlet and outlet of the device under test, and the size of the pressure measuring tube should be consistent with the inlet and outlet of the test section; Record inlet temperature, air pressure, and relative humidity; Measure and record the relationship between the differential pressure and the upstream absolute pressure of the device under test and at least four equally spaced gas flows or flow rates agreed upon by the customer and supplier; Record the inlet temperature, air pressure, and relative humidity again, and calibrate the recorded differential pressure readings to standard conditions as required; Measure the pressure loss and draw a pressure loss graph.

9. The method according to claim 8, characterized in that: The laboratory gravimetric efficiency test is used to determine the gravimetric separation efficiency of the equipment under new and conditioned conditions, and includes the following steps: Set the test duration to greater than 30 min, and the minimum mass obtained by the absolute filter to 1.0 g; The weight changes of the components and the absolute filter during the test are used to calculate the weight efficiency of the new and conditional states; When the new state is no longer maintained, the high-efficiency separator shall not exceed 3 hours to complete the efficiency evaluation of the product. Weigh and record the device under test, weigh and record the drainage container; Weigh the absolute filter and record the mass before assembly in the absolute filter housing; Weigh the downstream wall trap of the device under test; Set up a test bench for all aerosol separators and seal all connections to prevent air leaks.

10. The method according to claim 9, characterized in that: The laboratory weight efficiency test also includes the following steps: Record the temperature, pressure and relative humidity of the air outside the test section; Start the airflow of the test bench, stabilize it at the test flow rate according to the requirements of the air velocity measurement system, and record the pressure difference; Setting the aerosol generator to a predetermined oil flow rate, and starting the aerosol generator; Compensate for the increase in differential pressure introduced by the oil pipe between the device under test and the pressure measuring tube and the downstream wall flow steam trap; Use a downstream wall flow trap to prevent the liquid oil wall from flowing to the downstream pressure measuring tube, where the pressure loss of the downstream wall flow trap is subtracted from the total pressure loss; Every 10 minutes, record the pressure difference and test time under the air test flow rate; At the end of the test, record the pressure difference, interrupt the air flow or the aerosol generator oil flow, and remove the absolute filter; Turn off the aerosol generator and continue to run it at air flow rate for 15s to 30s to exhaust the gas in the oil-gas separator test bench and stop the air flow; Record the temperature, pressure and relative humidity of the air outside the test unit and weigh the device under test; the increase in mass of the tested component is the measured mass minus the recorded mass; Remove the absolute filter and repeat the above steps to determine the mass difference; Calculate the aerosol efficiency E a 、E T , P L , specifically: Sol efficiency E a : Calculate the overall efficiency E Tx : Calculate the amount of liquid penetration per unit time P L , the method is as follows: The aerosol flow rate O is calculated by the following method m : Where: E a - the efficiency of the unit under test; t——test time, in hours; E T1 - the total efficiency of the device under test, including liquid and aerosol; E T2 - Overall efficiency of the engine weight test unit, including liquid and aerosol; P L - liquid penetration of the device under test; Δm u - mass increment of the unit under test; Δm F - mass increase of absolute filters; Δm D ——Increase in mass of downstream wall flow steam trap; Δm d ——Increase in mass of leaking pipe; Δm T - Increased quality of alternative methods that capture the total challenge, absolute filtering approach.

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