A test device for testing performance of a ventilation filter of a crankcase and a test method thereof

Abstract

The application discloses a kind of ventilation filter performance test device of crankcase and its testing method, it is related to ventilation filter test technical field.The ventilation filter performance test device of crankcase includes oil drive system and filtration performance detection system, oil drive system includes oil tank, oil tank is communicated with ventilation filter, for providing drive oil liquid for ventilation filter, the speed of ventilation filter is adjusted by adjusting the pressure and flow of oil liquid.Filtration performance detection system includes oil mist generator, compressed air is communicated with ventilation filter by inlet pipeline, oil mist generator is arranged between the air inlet of inlet pipeline and ventilation filter, the oil mist generated in oil mist generator by compressed air and oil is mixed with compressed air again, and then enters ventilation filter, ventilation filter operates for a set time at a set speed, oil-gas separation is carried out on the oil-gas mixture entering ventilation filter, and the gas separated by ventilation filter is discharged through exhaust pipeline.

Description

Technical Field

[0001] This invention relates to the field of ventilation filter testing technology, and in particular to a testing device and method for testing the performance of a crankcase ventilation filter. Background Technology

[0002] The ventilation filter is a crucial component of the engine crankcase ventilation system, used to separate the oil-air mixture in the crankcase. As the air passage between the crankcase and the outside environment, if the crankcase ventilation system and the ventilation filter fail to effectively separate the oil components carried in the crankcase exhaust, oil consumption will increase, and the environment will be negatively impacted. Therefore, evaluating the efficiency of the ventilation filter and ensuring its design meets practical needs is of paramount importance.

[0003] During the development phase, oil-driven rotary ventilation filters must have testing equipment and methods to test their filtration performance in order to better improve and enhance the performance of crankcase ventilation filters. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device and method for the performance of crankcase ventilation filters. This device enables the oil-driven rotary ventilation filter to rotate under oil pressure and, in conjunction with a separation efficiency testing device, to test the filtration performance of the ventilation filter. This provides an effective verification method for researching and improving crankcase ventilation filters.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A testing apparatus for the performance of a crankcase ventilation filter, comprising:

[0007] An oil-driven system includes an oil tank connected to the ventilation filter, which provides driving oil to the ventilation filter and controls the rotational speed of the ventilation filter by controlling the pressure and flow rate of the driving oil.

[0008] A filtration performance testing system includes an oil mist generator. Compressed air is connected to the ventilation filter through an intake pipe. The oil mist generator is located between the intake port of the intake pipe and the ventilation filter. The oil mist generated by the compressed air and engine oil in the oil mist generator is mixed with the compressed air and then enters the ventilation filter. The ventilation filter operates at a set speed for a set time to separate the oil and gas mixture entering the ventilation filter. The gas separated by the ventilation filter is discharged through an exhaust pipe.

[0009] As an optional device for testing the performance of the crankcase ventilation filter, the filtration performance testing system further includes an absolute filter, which is disposed between the ventilation filter and the exhaust port of the exhaust pipe, for separating the engine oil that the ventilation filter has not separated.

[0010] As an optional device for testing the performance of the crankcase ventilation filter, the intake pipe includes a first intake branch and a second intake branch, which are connected in parallel between the intake port of the intake pipe and the ventilation filter.

[0011] The first intake branch is equipped with the oil mist generator, and the second intake branch is equipped with a first flow regulating valve, which is used to regulate the gas flow rate entering the ventilation filter.

[0012] As an optional device for testing the performance of the crankcase ventilation filter, a first flow meter is provided in the exhaust pipe, which is used to display the gas flow rate entering the ventilation filter.

[0013] As an optional device for testing the performance of the crankcase ventilation filter, a pressure regulating valve and a pressure gauge are also provided in the first intake branch. The pressure regulating valve adjusts the gas pressure entering the oil mist generator, and the pressure gauge is used to display the gas pressure in the oil mist generator.

[0014] As an optional embodiment of the testing device for the performance of the crankcase ventilation filter, the testing device for the performance of the crankcase ventilation filter further includes a differential pressure sensor, which is used to detect the pressure difference between the air inlet and the air outlet of the ventilation filter.

[0015] As an optional embodiment of the testing device for the crankcase ventilation filter performance, the testing device for the crankcase ventilation filter performance further includes a speed sensor, which is used to detect the speed of the ventilation filter.

[0016] As an optional device for testing the performance of the crankcase ventilation filter, the oil tank supplies the driving oil to the ventilation filter via an oil pump. A second flow regulating valve, a second flow meter, and a pressure sensor are also provided between the oil pump and the ventilation filter. The second flow regulating valve is used to regulate the flow rate of the driving oil entering the ventilation filter, the second flow meter is used to display the flow rate of the driving oil entering the ventilation filter, and the pressure sensor is used to detect the pressure of the driving oil entering the ventilation filter.

[0017] As an optional device for testing the performance of the crankcase ventilation filter, the oil drive system further includes a heating component disposed on the side wall of the oil tank for heating the drive oil in the oil tank.

[0018] As an optional device for testing the performance of the crankcase ventilation filter, the oil drive system further includes a temperature controller electrically connected to the heating assembly for controlling the heating temperature of the heating assembly.

[0019] A method for testing the performance of a crankcase ventilation filter, employing a crankcase ventilation filter performance testing apparatus as described in any of the above embodiments, the testing method comprising the following steps:

[0020] The oil tank provides the drive oil to the ventilation filter, and the rotational speed of the ventilation filter is adjusted by regulating the flow rate and pressure of the drive oil.

[0021] When the speed of the ventilation filter reaches the set speed, the intake pipe, the oil mist generator and the exhaust pipe are weighed and recorded respectively;

[0022] The compressed air is controlled to enter the intake pipe and mix with the engine oil in the oil mist generator to generate oil mist. The oil mist is then mixed with the compressed air and enters the ventilation filter for oil-gas separation.

[0023] The ventilation filter stops working after the set time has elapsed.

[0024] The intake pipe, the oil mist generator, and the exhaust pipe were disassembled in sequence, and their weights were weighed and recorded.

[0025] Calculate the separation efficiency of the ventilation filter.

[0026] The beneficial effects of this invention are:

[0027] The present invention provides a testing device for the performance of a crankcase ventilation filter. This device comprises an oil-driven system and a filtration performance testing system. The oil-driven system includes an oil tank that provides driving oil to the ventilation filter. The rotational speed of the ventilation filter is adjusted by regulating the pressure and flow rate of the driving oil. Before testing in the filtration performance testing system, the intake pipe, oil mist generator, and exhaust pipe of the system are weighed and recorded. During testing, the oil mist generator uses compressed air and engine oil to produce oil mist. The oil mist mixes with the compressed air and enters the ventilation filter to meet the gas flow requirements during testing. The ventilation filter separates the oil-air mixture at a set rotational speed, and the separated gas is discharged through the exhaust pipe. After operating at the set rotational speed for a set time, the ventilation filter stops operating. After the ventilation filter stops working, the intake pipe, oil mist generator, and exhaust pipe are weighed and recorded. Then, based on the weights of the intake pipe, oil mist generator, and exhaust pipe before and after the test, the separation efficiency of the ventilation filter is calculated. The crankcase ventilation filter performance testing device provided by this invention can detect the filtration performance of oil-driven rotary ventilation filters, providing an effective verification method for studying and improving the performance of crankcase ventilation filters.

[0028] The crankcase ventilation filter performance testing method provided by the present invention, using the above-mentioned crankcase ventilation filter performance testing device, tests the separation efficiency of the oil-driven rotary ventilation filter at a set speed, which can better improve and enhance the performance of the crankcase ventilation filter. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the testing device for the performance of the crankcase ventilation filter provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of the oil-driven system of the crankcase ventilation filter performance testing device provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the filtration performance testing system of the crankcase ventilation filter performance testing device provided in Embodiment 1 of the present invention.

[0032] In the picture:

[0033] 1. Oil tank; 2. Temperature sensor; 3. Temperature controller; 4. Heating assembly; 5. Oil pump; 6. Second flow regulating valve; 7. Second flow meter; 8. Pressure sensor; 9. Ventilation filter; 10. Speed ​​sensor; 11. Air filter; 12. Pressure regulating valve; 13. First flow regulating valve; 14. Pressure gauge; 15. Oil mist generator; 16. Upstream pressure sensor; 17. Differential pressure sensor; 18. Downstream pressure sensor; 19. Absolute filter; 20. First flow meter. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0036] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0037] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a testing device for the performance of a crankcase ventilation filter, including an oil-driven system and a filtration performance testing system. The oil-driven system includes an oil tank 1, which is connected to the ventilation filter 9 and provides driving oil to the ventilation filter 9. The rotational speed of the ventilation filter 9 is adjusted by regulating the pressure and flow rate of the driving oil. The filtration performance testing system includes an oil mist generator 15. Compressed air is connected to the ventilation filter 9 through an intake pipe. The oil mist generator 15 is located between the intake port of the intake pipe and the ventilation filter 9. The oil mist generated by the compressed air and engine oil in the oil mist generator 15 is mixed with the compressed air and then enters the ventilation filter 9. The ventilation filter 9 runs at a set speed for a set time to separate the oil-gas mixture entering the ventilation filter 9. The gas separated by the ventilation filter 9 is discharged through the exhaust pipe.

[0041] By setting up an oil-driven system and a filtration performance testing system, the oil-driven system includes an oil tank 1, which provides driving oil to the ventilation filter 9. The rotational speed of the ventilation filter 9 is adjusted by regulating the pressure and flow rate of the driving oil. Before testing the filtration performance testing system, the intake pipe, oil mist generator 15, and exhaust pipe of the filtration performance testing system are weighed and the results are recorded. During the filtration performance testing system test, the oil mist generator 15 uses compressed air and engine oil to generate oil mist. The generated oil mist mixes with the compressed air and enters the ventilation filter 9 to meet the gas flow requirements of the ventilation filter 9 during testing. The ventilation filter 9 separates the oil-gas mixture entering it at a set rotational speed, and the separated gas is discharged through the exhaust pipe. After the ventilation filter 9 operates at the set rotational speed for a set time, it stops working. After the ventilation filter 9 stops working, the intake pipe, oil mist generator 15, and exhaust pipe are weighed and the weights recorded. Then, based on the weights of the intake pipe, oil mist generator 15, and exhaust pipe before and after the test, the separation efficiency of the ventilation filter 9 is calculated. The crankcase ventilation filter performance testing device provided by this invention can test the filtration performance of the oil-driven rotary ventilation filter 9, providing an effective verification method for studying and improving the performance of the crankcase ventilation filter 9.

[0042] The crankcase ventilation filter performance testing device provided in this embodiment is set on an experimental bench, which is equipped with an oil-driven system and a filtration performance testing system.

[0043] like Figure 2As shown, as an optional device for testing the performance of the crankcase ventilation filter, the oil-driven system also includes a heating assembly 4 and a temperature controller 3. The heating assembly 4 is disposed on the side wall of the oil tank 1 and is used to heat the drive oil in the oil tank 1. The temperature controller 3 is electrically connected to the heating assembly 4 and is used to control the heating temperature of the heating assembly 4.

[0044] Heating component 4 is used to heat the driving fluid in oil tank 1. The heating temperature is set by temperature controller 3. When heating component 4 reaches the set heating temperature, it stops heating. Heating component 4 heats the driving fluid in oil tank 1 to the set heating temperature to simulate the internal temperature of the engine during operation. The set heating temperature is the internal temperature of the engine during operation.

[0045] The bottom of the oil tank 1 is cone-shaped with a cone angle of 100°. The heating component 4 is a heating belt, which is fixed to the side wall of the oil tank 1.

[0046] Optionally, a temperature sensor 2 is also installed in the oil tank 1. The temperature sensor 2 is used to detect the temperature of the driving oil in the oil tank 1. When the temperature sensor 2 detects that the temperature of the driving oil has reached the set heating temperature, it controls the heating component 4 to stop heating.

[0047] As an optional device for testing the performance of the crankcase ventilation filter, the oil tank 1 supplies driving oil to the ventilation filter 9 through the oil pump 5. A second flow regulating valve 6, a second flow meter 7, and a pressure sensor 8 are also provided between the oil pump 5 and the ventilation filter 9. The second flow regulating valve 6 is used to regulate the flow rate of the driving oil entering the ventilation filter 9, the second flow meter 7 is used to display the flow rate of the driving oil entering the ventilation filter 9, and the pressure sensor 8 is used to detect the pressure of the driving oil entering the ventilation filter 9.

[0048] When the driving oil in tank 1 is heated to the set heating temperature, it enters the ventilation filter 9 under the drive of oil pump 5.

[0049] The second flow regulating valve 6 includes one inlet and two outlets. The inlet of the second flow regulating valve 6 is connected to the outlet of the oil pump 5. One of the two outlets is connected to the oil tank 1, forming a bypass circuit; the other outlet is connected to the ventilation filter 9, forming a test circuit. The second flow regulating valve 6 can control the circulation of the driving oil in the oil tank 1 in the bypass circuit or in the test circuit. Simultaneously, the second flow regulating valve 6 can also regulate the flow rate of the oil entering the ventilation filter 9. The flow regulation accuracy of the second flow regulating valve 6 is within ±1%.

[0050] When the temperature of the driving oil does not reach the set heating temperature, the oil inlet of the second flow regulating valve 6 and the oil outlet connected to the oil tank 1 are connected, so that the driving oil in the oil tank 1 circulates in the bypass circuit and is heated to the set heating temperature to simulate the working environment inside the engine.

[0051] When the temperature sensor 2 detects that the driving oil in the oil tank 1 has reached the set heating temperature, the oil inlet of the second flow regulating valve 6 and the oil outlet connected to the ventilation filter 9 are connected, so that the driving oil in the oil tank 1 enters the ventilation filter 9 through the test circuit.

[0052] The second flow meter 7 and the pressure sensor 8 are both located at the oil inlet of the ventilation filter 9. The second flow meter 7 is used to detect the flow rate at the oil inlet of the ventilation filter 9, and the pressure sensor 8 is used to detect the pressure at the oil inlet of the ventilation filter 9. By accurately detecting the flow rate and pressure at the oil inlet of the ventilation filter 9, the rotation speed of the ventilation filter 9 is controlled.

[0053] By adjusting the second flow regulating valve 6, the flow rate of the driving oil entering the oil inlet of the ventilation filter 9 is controlled, so that the pressure at the oil inlet of the ventilation filter 9 detected by the pressure sensor 8 reaches the set pressure value. By adjusting the flow rate and pressure of the driving oil entering the ventilation filter 9, the rotation speed of the ventilation filter 9 is adjusted. The driving oil enters the ventilation filter 9 from the oil inlet and drives the ventilation filter 9 to rotate. As the ventilation filter 9 rotates, the oil-gas mixture entering the ventilation filter 9 is separated by centrifugal force. The separated gas enters the exhaust pipe from the exhaust port of the ventilation filter 9, while the engine oil remains at the bottom of the ventilation filter 9 under the action of gravity. The driving oil returns to the oil tank 1 from the oil outlet of the ventilation filter 9.

[0054] As an optional device for testing the performance of the crankcase ventilation filter, the device also includes a speed sensor 10, which is used to detect the speed of the ventilation filter 9.

[0055] When the speed sensor 10 detects that the speed of the ventilation filter 9 has reached the set speed, the filtration performance of the ventilation filter 9 is tested by the filtration performance testing system.

[0056] like Figure 3 As shown, as an optional device for testing the performance of the crankcase ventilation filter, the filtration performance testing system also includes an absolute filter 19, which is disposed between the ventilation filter 9 and the exhaust port of the exhaust pipe, and is used to separate the engine oil that the ventilation filter 9 has not separated.

[0057] The absolute filter 19 can further separate the oil and gas in the gas separated by the ventilation filter 9, ensuring that there is no oil in the gas discharged through the exhaust pipe, reducing oil consumption in the engine, and preventing air pollution. Moreover, it can more accurately calculate the separation efficiency of the ventilation filter 9.

[0058] As an optional device for testing the performance of the crankcase ventilation filter, the intake pipeline includes a first intake branch and a second intake branch, which are connected in parallel between the intake port of the intake pipeline and the ventilation filter 9. An oil mist generator 15 is provided in the first intake branch, and a first flow regulating valve 13 is provided in the second intake branch. The first flow regulating valve 13 is used to regulate the gas flow rate entering the ventilation filter 9.

[0059] Compressed air enters through the intake port of the intake pipe and splits into two paths. One path enters the oil mist generator 15 through the first intake branch, where it mixes with engine oil to generate oil mist. The engine oil in the oil mist generator 15 is supplied through an oil bottle. The other path enters the ventilation filter 9 through the second intake branch, mixing with the oil mist generated by the oil mist generator 15 for oil-gas separation. The flow rate of the gas entering the ventilation filter 9 is regulated by the first flow regulating valve 13 on the second intake branch to meet the required flow rate for filtration. However, the flow rate of the oil mist generated in the oil mist generator 15 is too small to meet the required flow rate for filtration, so it needs to mix with the compressed air in the second intake branch before entering the ventilation filter 9.

[0060] Optionally, an air filter 11 is also installed between the air inlet of the air intake pipe and the first and second air intake branches. The air filter 11 is used to filter impurities (oil, water, or dust, etc.) in the compressed air. The filtered compressed air is divided into two paths and enters the ventilation filter 9 to ensure the accuracy of the calculation of the separation efficiency of the ventilation filter 9.

[0061] As an optional device for testing the performance of the crankcase ventilation filter, a first flow meter 20 is installed in the exhaust pipe. The first flow meter 20 is used to display the gas flow rate entering the ventilation filter 9. The first flow meter 20 can display the gas flow rate entering the ventilation filter 9, and cooperate with the first flow regulating valve 13 to adjust the gas flow rate entering the ventilation filter 9 to meet the gas flow requirements of the ventilation filter 9.

[0062] As an optional device for testing the performance of the crankcase ventilation filter, a pressure regulating valve 12 and a pressure gauge 14 are also provided in the first intake branch. The pressure regulating valve 12 adjusts the gas pressure entering the oil mist generator 15, and the pressure gauge 14 displays the gas pressure in the oil mist generator 15. By coordinating the pressure regulating valve 12 and the pressure gauge 14, the gas pressure entering the oil mist generator 15 is adjusted so that the gas entering the oil mist generator 15 can mix with the engine oil to form oil mist.

[0063] As an optional device for testing the performance of the crankcase ventilation filter, the device also includes a differential pressure sensor 17, which is used to detect the pressure difference between the air inlet and outlet of the ventilation filter 9.

[0064] The pressure difference between the air inlet and outlet of the ventilation filter 9 is detected by the differential pressure sensor 17, and the resistance of the ventilation filter 9 under the set gas flow rate is tested.

[0065] Optionally, an upstream pressure sensor 16 is installed at the air inlet of the ventilation filter 9, and a downstream pressure sensor 18 is installed at the air outlet of the ventilation filter 9. The upstream pressure sensor 16 is used to detect the pressure at the air inlet of the ventilation filter 9, and the downstream pressure sensor 18 is used to detect the pressure at the air outlet of the ventilation filter 9. The difference between the pressure value measured by the upstream pressure sensor 16 and the pressure value measured by the downstream pressure sensor 18 is the pressure difference between the air inlet and the air outlet of the ventilation filter 9. This difference can be compared with the pressure difference measured by the differential pressure sensor 17 to verify whether the pressure difference measured by the differential pressure sensor 17 is accurate.

[0066] Example 2

[0067] This embodiment provides a method for testing the performance of a crankcase ventilation filter, using the testing device for the crankcase ventilation filter provided in Embodiment 1. The testing method includes the following steps:

[0068] (1) Turn on the power of the test device for the performance of the crankcase ventilation filter on the test bench and check whether there is enough drive oil in the oil tank 1 for testing.

[0069] (2) Confirm the status of the ventilation filter 9 and install it.

[0070] After confirming that the ventilation filter 9 is in a sealed state, install the ventilation filter 9 between the oil drive system and the filtration performance testing system.

[0071] (3) The oil tank 1 provides driving oil to the ventilation filter 9. By adjusting the flow rate and pressure of the driving oil, the rotation speed of the ventilation filter 9 is controlled.

[0072] Turn on the oil pump 5 and set the temperature of the temperature controller 3 to the set heating temperature; control the heating component 4 to start heating and adjust the second flow regulating valve 6 so that the driving oil in the oil tank 1 circulates in the bypass circuit and is heated to the set heating temperature to simulate the working environment inside the engine.

[0073] When temperature sensor 2 detects that the driving oil in tank 1 has reached the set heating temperature, it adjusts the second flow regulating valve 6, allowing the driving oil in tank 1 to enter the ventilation filter 9 through the test circuit. The flow rate of the driving oil in the test circuit is obtained through the second flow meter 7, and the pressure of the driving oil in the test circuit is obtained through the pressure sensor 8.

[0074] The flow rate and pressure of the driving oil input to the ventilation filter 9 are adjusted by the second flow regulating valve 6, thereby adjusting the rotation speed of the ventilation filter 9. The real-time rotation speed of the ventilation filter 9 is detected by the speed sensor 10.

[0075] (4) When the speed of the ventilation filter 9 reaches the set speed, weigh and record the intake pipe, oil mist generator 15, exhaust pipe and absolute filter 19 respectively.

[0076] When the real-time rotational speed of the ventilation filter 9, as measured by the speed sensor 10, reaches the set speed, the filtration performance of the ventilation filter 9 can be tested by the filtration performance testing system. Before testing the filtration performance of the ventilation filter 9, the intake pipe, oil mist generator 15, and exhaust pipe are weighed and recorded respectively.

[0077] Record the weight of the oil mist generator 15 before testing as M1; record the weight of the intake pipe before testing as M2; record the weight of the exhaust pipe before testing as M3; record the weight of the absolute filter 19 before testing as M4.

[0078] (5) Control the compressed air to enter the intake pipe and generate oil mist with the engine oil in the oil mist generator 15. The oil mist is then mixed with the compressed air and enters the ventilation filter 9 for oil-gas separation.

[0079] Open the intake pipe, and the compressed air enters the intake pipe and first passes through the air filter 11 to filter out impurities. Then adjust the pressure regulating valve 12 so that the pressure value displayed on the pressure gauge 14 reaches the set pressure required by the oil mist generator 15.

[0080] Adjust the first flow regulating valve 13 so that the flow rate of the compressed air and oil mist mixture meets the gas flow rate requirement of the ventilation filter 9. After the flow rate displayed by the first flow meter 20 stabilizes, record the current flow rate, as well as the pressure values ​​of the upstream pressure sensor 16 and the downstream pressure sensor 18. At this point, start the test and timing.

[0081] (6) After the ventilation filter 9 has been running for a set time, it will stop working.

[0082] After the ventilation filter 9 has run for the set time, the timer stops, and the compressed air, heating component 4, and oil pump 5 are turned off.

[0083] The set time is the test time specified in the test standard for ventilation filter 9. In this embodiment, the set time is two hours.

[0084] (7) Remove the intake pipe, oil mist generator 15, exhaust pipe and absolute filter 19 in sequence, and weigh and record them respectively.

[0085] Handle with care during disassembly to avoid oil spills and sample contamination.

[0086] The weight of the oil mist generator 15 after testing is recorded as M5; the weight of the intake pipe after testing is recorded as M6; the weight of the exhaust pipe after testing is recorded as M7; and the weight of the absolute filter 19 after testing is recorded as M8.

[0087] (8) Calculate the separation efficiency of ventilation filter 9.

[0088] The amount of oil mist generated by oil mist generator 15 is the total amount of oil added, and the total amount of oil added is M. 总 M 总 =M1-M5.

[0089] Since the ventilation filter 9 needs to be connected to the oil circuit during testing, the residual driving oil in the oil circuit has a significant impact on the separation efficiency. Therefore, it is necessary to calculate the weight gain of the ventilation filter 9. The weight gain of the ventilation filter 9 is M. 滤清器 M 滤清器 =M 总 -M 进 -M 排 -M 绝对滤 M 滤清器 =M8-M4,M 进 =M6-M2,M 排 =M7-M3.

[0090] The separation efficiency I of the ventilation filter 9 is calculated based on the weight gain of the ventilation filter 9 and the total oil supply:

[0091] I = M 滤清器 / M 总 .

[0092] The crankcase ventilation filter performance test method provided in this embodiment uses the crankcase ventilation filter performance test device provided in Embodiment 1 to test the separation efficiency of the oil-driven rotary ventilation filter 9 at a set speed, which can better improve and enhance the performance of the crankcase ventilation filter 9.

[0093] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A testing device for the performance of a crankcase ventilation filter, characterized in that, include: The oil-driven system includes an oil tank (1) connected to the ventilation filter (9) for providing driving oil to the ventilation filter (9) and adjusting the rotational speed of the ventilation filter (9) by adjusting the pressure and flow rate of the driving oil. The filtration performance testing system includes an oil mist generator (15). Compressed air is connected to the ventilation filter (9) through an intake pipe. The oil mist generator (15) is located between the intake port of the intake pipe and the ventilation filter (9). The oil mist generated by the compressed air and engine oil in the oil mist generator (15) is mixed with the compressed air and then enters the ventilation filter (9). The ventilation filter (9) runs at a set speed for a set time to separate the oil and gas mixture entering the ventilation filter (9). The gas after oil and gas separation by the ventilation filter (9) is discharged through the exhaust pipe. Before the filtration performance testing system is tested, the intake pipe, oil mist generator (15) and exhaust pipe in the filtration performance testing system are weighed and recorded. After the ventilation filter (9) stops working, the intake pipe, oil mist generator (15) and exhaust pipe are weighed and recorded again. Based on the weight of the intake pipe, oil mist generator (15) and exhaust pipe before and after the test, the separation efficiency of the ventilation filter (9) is calculated. The testing device for the performance of the crankcase ventilation filter also includes a speed sensor (10), which is used to detect the speed of the ventilation filter (9).

2. The testing apparatus for the performance of the crankcase ventilation filter according to claim 1, characterized in that, The filtration performance testing system also includes an absolute filter (19), which is disposed between the ventilation filter (9) and the exhaust port of the exhaust pipe, and is used to separate the engine oil that is not separated by the ventilation filter (9).

3. The testing apparatus for the performance of the crankcase ventilation filter according to claim 1, characterized in that, The air intake pipeline includes a first air intake branch and a second air intake branch, which are connected in parallel between the air intake port of the air intake pipeline and the ventilation filter (9). The first intake branch is equipped with the oil mist generator (15), and the second intake branch is equipped with a first flow regulating valve (13). The first flow regulating valve (13) is used to regulate the gas flow rate entering the ventilation filter (9).

4. The testing apparatus for the performance of the crankcase ventilation filter according to claim 3, characterized in that, The exhaust pipe is equipped with a first flow meter (20), which is used to display the gas flow rate entering the ventilation filter (9).

5. The testing apparatus for the performance of the crankcase ventilation filter according to claim 3, characterized in that, The first intake branch is also equipped with a pressure regulating valve (12) and a pressure gauge (14). The pressure regulating valve (12) is used to regulate the gas pressure entering the oil mist generator (15), and the pressure gauge (14) is used to display the gas pressure in the oil mist generator (15).

6. The testing apparatus for the performance of the crankcase ventilation filter according to claim 1, characterized in that, The testing device for the performance of the crankcase ventilation filter also includes a differential pressure sensor (17), which is used to detect the pressure difference between the air inlet and the air outlet of the ventilation filter (9).

7. The testing apparatus for the performance of the crankcase ventilation filter according to claim 1, characterized in that, The oil tank (1) supplies the driving oil to the ventilation filter (9) through the oil pump (5). A second flow regulating valve (6), a second flow meter (7) and a pressure sensor (8) are also provided between the oil pump (5) and the ventilation filter (9). The second flow regulating valve (6) is used to regulate the flow rate of the driving oil entering the ventilation filter (9). The second flow meter (7) is used to display the flow rate of the driving oil entering the ventilation filter (9). The pressure sensor (8) is used to detect the pressure of the driving oil entering the ventilation filter (9).

8. The testing apparatus for the performance of the crankcase ventilation filter according to claim 1, characterized in that, The oil drive system also includes a heating component (4), which is disposed on the side wall of the oil tank (1) and is used to heat the drive oil in the oil tank (1).

9. The testing apparatus for the performance of the crankcase ventilation filter according to claim 8, characterized in that, The oil-driven system also includes a temperature controller (3), which is electrically connected to the heating component (4) and is used to control the heating temperature of the heating component (4).

10. A method for testing the performance of a crankcase ventilation filter, characterized in that, The test apparatus for testing the performance of the crankcase ventilation filter as described in any one of claims 1-9, the test method comprising the following steps: The oil tank (1) provides the driving oil to the ventilation filter (9), and the rotational speed of the ventilation filter (9) is adjusted by regulating the flow rate and pressure of the driving oil; When the rotation speed of the ventilation filter (9) reaches the set rotation speed, the intake pipe, the oil mist generator (15) and the exhaust pipe are weighed and recorded respectively; The compressed air is controlled to enter the intake pipe and generate oil mist with the engine oil in the oil mist generator (15). The oil mist is then mixed with the compressed air and enters the ventilation filter (9) for oil-gas separation. The ventilation filter (9) stops working after the set time has elapsed; The intake pipe, the oil mist generator (15) and the exhaust pipe were removed in sequence, and their weights were weighed and recorded. Calculate the separation efficiency of the ventilation filter (9).

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