An oil-gas separation filter element simulation working condition test device

Abstract

The application discloses an oil-gas separation filter element simulation working condition test device, and belongs to the technical field of oil-gas separation filters, which comprises a high-pressure gas supply system, a variable-concentration oil mist supply system, an oil-gas separation system to be tested and a detection system; wherein a flow regulating device is installed on an oil conveying branch of the variable-concentration oil mist supply system, the oil-gas separation system comprises an oil-gas tank and a to-be-tested oil-gas separation filter element installed in the oil-gas tank, an oil-gas mixing space is formed between the oil-gas tank and the to-be-tested oil-gas separation filter element, an atomizing nozzle of the variable-concentration oil mist supply system, a front bypass pipeline for supplying high-pressure gas and an air inlet hole of the to-be-tested oil-gas separation filter element are all in communication with the oil-gas mixing space; the flow regulating device is installed on the oil conveying branch, the oil mist concentration can be accurately and flexibly adjusted, the test working condition can be close to the real working condition when different types of air compressors work, and thus the reference value of the test result to the performance improvement of the oil-gas separation filter element is improved.

Description

Technical Field

[0001] This invention relates to the field of oil-gas separator filter technology, and in particular to a test device for simulating working conditions of oil-gas separator filter elements. Background Technology

[0002] An oil-gas separator filter element is a consumable accessory installed inside an oil-air compressor. Its main function is to separate oil mist from the compressed air mixture. In traditional air compressor testing setups, the oil injection volume of the main unit is set at the factory. This means that after the injection device and oil-gas separator tank are finalized, the oil mist concentration of the gas entering the oil-gas separator filter element is essentially unadjustable. However, the oil mist concentration before the oil-gas separator filter element enters the system is a crucial parameter in performance testing, directly affecting the oil content in the exhaust gas after separation. If this operating parameter, oil mist concentration, could be precisely and quantitatively adjusted, the authenticity and accuracy of the experimental test results could be greatly improved.

[0003] Therefore, the purpose of this invention is to design and invent an experimental device for simulating the working conditions of an oil-gas separator filter element. By quantitatively and precisely adjusting the concentration of oil mist entering the oil-gas separator filter element, the actual working conditions of different models of air compressors are simulated. The device summarizes the influence of different oil mist concentration changes on the oil content and pressure difference of the exhaust gas of the oil-gas separator filter element, providing scientific and reliable data support for the design and development of the oil-gas separator filter element. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies and shortcomings of existing technologies by providing a simulated operating condition test device for oil-gas separator filter elements. By installing a flow regulating device on the oil delivery branch for testing, the oil mist concentration can be accurately and flexibly adjusted, making the test conditions close to the actual operating conditions of different models of air compressors. This improves the reference value of the test results for enhancing the performance of oil-gas separator filter elements and helps to design higher-performance oil-gas separator filter elements.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a simulated working condition test device for an oil-gas separator filter element, comprising a high-pressure gas supply system, a variable concentration oil mist supply system, an oil-gas separation system to be tested, and a detection system;

[0007] The high-pressure gas supply system includes a front bypass pipeline for delivering high-pressure gas for testing.

[0008] The variable concentration oil mist supply system includes a test oil delivery branch, a second high-pressure gas delivery branch, and an atomizing nozzle. The test oil delivery branch is equipped with a flow regulating device for adjusting the amount of oil delivered. The test oil delivery branch is connected to the oil inlet of the atomizing nozzle, and the second high-pressure gas delivery branch is connected to the air inlet of the atomizing nozzle. Under the action of high-pressure gas, the test oil is atomized into oil mist.

[0009] The oil-gas separation system to be tested includes an oil-gas tank and an oil-gas separation filter element to be tested installed in the oil-gas tank. The oil-gas separation filter element to be tested has an air inlet and an air outlet. An oil-gas mixing space is formed between the oil-gas tank and the oil-gas separation filter element to be tested. The air outlet of the front bypass pipe, the outlet of the atomizing nozzle, and the air inlet are all connected to the oil-gas mixing space so that the oil mist and the high-pressure gas for testing are first mixed in the oil-gas mixing space, and then enter the interior of the oil-gas separation filter element to be tested through the air inlet.

[0010] The detection system includes an exhaust oil content testing device, which is connected to the exhaust port to detect the oil content concentration in the gas after it has been treated by the oil-gas separator filter element to be tested.

[0011] Preferably, the oil-gas mixing space is located at the bottom of the oil-gas separator filter element to be tested. After the oil mist and the high-pressure gas for testing are mixed in the oil-gas mixing space, they flow upward to enter the interior of the oil-gas separator filter element to be tested through the air inlet.

[0012] Preferably, the air inlet is located on the outer peripheral surface of the oil-gas separator filter element to be tested, the exhaust port is located at the end of the oil-gas separator filter element to be tested, and the end of the oil-gas separator filter element to be tested with the exhaust port is connected to the top cover of the oil-gas tank.

[0013] The oil-gas tank is also equipped with a coarse separation inner baffle. The coarse separation inner baffle is installed on the top cover of the oil-gas tank. The axial length of the coarse separation inner baffle is greater than the axial length of the oil-gas separator filter element to be tested. A first annular channel for high-pressure gas flow is formed between the coarse separation inner baffle and the oil-gas separator filter element to be tested. A second annular channel for mixed oil-gas flow is formed between the coarse separation inner baffle and the oil-gas separator filter element to be tested. The outlet of the front bypass pipe is connected to the upper end of the first annular channel. The lower end of the first annular channel is connected to the oil-gas mixing space. The outlet of the atomizing nozzle is located below the outlet of the front bypass pipe, so that the high-pressure gas for testing flows downward and mixes with the oil mist, and then flows upward to enter the interior of the oil-gas separator filter element to be tested.

[0014] Preferably, the outlet of the front bypass pipe extends tangentially into the interior of the oil and gas tank.

[0015] Preferably, the atomizing nozzle is located at the lower part of the bottom end of the coarse separator inner baffle, the atomizing nozzle is inclined relative to the axis of the oil and gas tank, and the outlet of the atomizing nozzle faces the bottom of the oil and gas tank.

[0016] Preferably, the inlet of the test oil delivery branch is connected to a test oil storage container with heating and heat preservation functions, and the temperature range of the heated test oil is the same as the actual exhaust temperature range of the air compressor.

[0017] Preferably, a pressure regulating valve for adjusting the pressure of the high-pressure gas is installed on the second high-pressure gas delivery branch.

[0018] Preferably, the end of the front bypass pipeline away from the oil and gas tank is connected to the air outlet of the air compressor, and the oil content of the high-pressure gas discharged from the air outlet of the air compressor is ≤3ppm.

[0019] Preferably, the high-pressure gas supply system further includes a second oil-gas separator filter element, a three-way valve, a main exhaust pipe, a rear bypass pipe, and a switching valve. The second oil-gas separator filter element is located inside the air compressor, and the outlet of the second oil-gas separator filter element is connected to the front bypass pipe and the main exhaust pipe through the three-way valve.

[0020] The exhaust port of the oil-gas separator filter element under test is connected to the rear bypass pipeline, and the other end of the rear bypass pipeline is connected to the main exhaust pipeline through the switch valve.

[0021] Preferably, the air compressor is an oil-injected screw variable frequency air compressor, and an adjustable second switch valve is installed at the exhaust port of the air compressor. The cooling fan of the air compressor is connected to a control device, which is used to regulate the start and stop temperature of the cooling fan.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] 1. This invention sets up a flow regulating device on the test oil delivery branch, which flexibly and accurately adjusts the flow rate of the test oil, thereby adjusting the concentration of the test oil mist. This makes the test conditions closer to the actual working conditions of different models of air compressors, thereby improving the reference value of the test results for improving the performance of oil-gas separator filter elements and helping to develop higher-performance oil-gas separator filter elements.

[0024] Other technical solutions of the present invention have achieved the following technical effects compared with the prior art:

[0025] 2. This invention sets up a front bypass pipeline connected to an air compressor, and installs a second oil-gas separator filter element inside the air compressor. The second oil-gas separator filter element is connected to the front bypass pipeline and the main exhaust pipeline through a three-way valve. During testing, the air compressor provides high-pressure gas for testing to the oil-gas tank. When not testing, the gas generated by the air compressor flows to other equipment through the main exhaust pipeline for other purposes. That is, the technical solution of this application, on the basis of the air compressor being able to perform its original function, can also enable it to provide high-pressure gas for testing to the test device, which greatly reduces the design cost compared to setting up other high-pressure gas sources.

[0026] 3. The present invention sets up a bypass pipeline with one end connected to the exhaust port of the oil-gas separator filter element under test, and the other end connected to the main exhaust pipeline through a ball valve. This allows the gas discharged from the oil-gas separator filter element under test to flow to the main exhaust pipeline. In other words, during experimental testing, the equipment connected to the main exhaust pipeline can also be ensured to work normally. That is, the experimental device of this application can achieve the technical effect of simultaneously carrying out experimental testing and the normal operation of the equipment connected to the main exhaust pipeline, without interrupting the normal operation of the equipment connected to the main exhaust pipeline due to experimental testing, thus maximizing the function of the air compressor. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the oil-gas separator filter element simulated working condition test device.

[0029] Figure 2 This is a structural diagram showing the relationship between the atomizing nozzle, the oil and gas tank, and the coarse separator inner baffle.

[0030] The components include: 1. Front bypass pipeline; 2. Test oil delivery branch; 3. Second high-pressure gas delivery branch; 4. Atomizing nozzle; 5. Flow regulating device; 6. Oil-gas tank; 7. Oil-gas separator filter element to be tested; 8. Oil-gas mixing space; 9. Exhaust oil content testing device; 10. Coarse separator inner baffle; 11. First annular channel; 12. Second annular channel; 13. Test oil storage container; 14. Air compressor; 15. Second oil-gas separator filter element; 16. Three-way valve; 17. Main exhaust pipeline; 18. Rear bypass pipeline; 19. Switch valve; 20. Vortex flow meter; 21. Precision pressure gauge; 22. Return oil collection tank; 23. Pressure regulating valve. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 2 As shown, the present invention provides a simulated working condition test device for an oil-gas separator filter element, including a high-pressure gas supply system, a variable concentration oil mist supply system, an oil-gas separation system to be tested, and a detection system; wherein, the high-pressure gas supply system includes a front bypass pipeline 1 for conveying high-pressure gas for testing; the variable concentration oil mist supply system includes a test oil delivery branch 2, a second high-pressure gas delivery branch 3, and an atomizing nozzle 4, wherein a flow regulating device 5 for adjusting the amount of oil delivered is installed on the test oil delivery branch 2. As a preferred embodiment of the present application, the flow regulating device 5 is a quantitative fluid regulating pump, and the atomizing nozzle 4 has an oil inlet and an air inlet, wherein the oil inlet is connected to the test oil delivery branch 2, and the air inlet is connected to the second high-pressure gas delivery branch 3, and the test oil is atomized into oil mist under the action of high-pressure gas.

[0034] The oil-gas separation system includes an oil-gas tank 6 and an oil-gas separation filter element 7 to be tested installed in the oil-gas tank 6. The oil-gas separation filter element 7 to be tested has an air inlet and an air outlet. An oil-gas mixing space 8 is formed between the oil-gas tank 6 and the oil-gas separation filter element 7 to be tested. The air outlet of the front bypass pipe 1, the outlet of the atomizing nozzle 4, and the air inlet are all connected to the oil-gas mixing space 8 so that the oil mist and the high-pressure gas for testing are mixed in the oil-gas mixing space 8 first, and then enter the interior of the oil-gas separation filter element 7 to be tested through the air inlet.

[0035] The detection system includes an exhaust oil content testing device 9, which is connected to the exhaust port of the oil-gas separator filter element 7 to be tested, in order to detect the oil content concentration in the gas after being treated by the oil-gas separator filter element 7; as a preferred embodiment of this application, the exhaust oil content testing device 9 is an exhaust oil content tester.

[0036] By quantitatively adjusting the delivery volume of the test oil using the flow regulating device 5, the concentration of the test oil mist can be adjusted more flexibly and accurately, thereby achieving the goal of accurately simulating the real operating conditions of different models of air compressors. Based on a series of test results, the influence relationship between different oil mist concentration changes and the exhaust oil content of the oil-gas separator filter element is summarized, providing scientific and reliable data support for the design and development of the oil-gas separator filter element, and helping to develop higher quality oil-gas separator filter elements.

[0037] Compared to the case where the oil-gas mixing space 8 is located at the bottom of the oil-gas separation filter element 7 under test, the mixing effect of oil mist and test high-pressure gas is relatively poor when the oil-gas mixing space 8 is located at the top of the oil-gas separation filter element 7 under test. Therefore, this application prefers the oil-gas mixing space 8 to be located at the bottom of the oil-gas separation filter element 7 under test.

[0038] Furthermore, the air inlet is located on the outer circumferential surface of the oil-gas separator filter element 7 to be tested, and the exhaust port is located at the end of the oil-gas separator filter element 7 to be tested. The end of the oil-gas separator filter element 7 to be tested with the exhaust port is connected to the top cover of the oil-gas tank 6. The oil-gas tank 6 is also provided with a coarse separation inner baffle 10. The coarse separation inner baffle 10 is installed on the top cover of the oil-gas tank 6. The axial length of the coarse separation inner baffle 10 is greater than the axial length of the oil-gas separator filter element 7 to be tested. A first annular channel 11 for high-pressure gas flow is formed between the coarse separation inner baffle 10 and the oil-gas tank 6. A second annular channel 12 for mixed oil-gas flow is formed between the coarse separation inner baffle 10 and the oil-gas separator filter element 7 to be tested. The air outlet of the front bypass pipe 1 is connected to the upper end of the first annular channel 11. The lower end of the first annular channel 11 is connected to the oil-gas mixing space 8. The outlet of the atomizing nozzle 4 is located below the air outlet of the front bypass pipe 1.

[0039] During operation, under the obstruction of the coarse separation inner baffle 10, the high-pressure gas used for testing does not directly enter the interior of the oil-gas separator filter element. Instead, it first flows downward along the first annular channel 11 and mixes with the oil mist to form oil-gas. Then, the oil-gas flows upward along the second annular channel 12 and enters the interior of the oil-gas separator filter element 7 under test through the air inlet. Due to the structural limitations of the oil-gas separator filter element 7 under test, the oil-gas pressure in the oil-gas mixing space 8 can only enter the interior of the oil-gas separator filter element 7 under test when it is greater than the resistance when the oil-gas enters the interior of the oil-gas separator filter element 7. Therefore, the oil-gas entering the oil-gas tank 6 will first accumulate in the oil-gas mixing space 8. During the accumulation process, under the stirring action of the airflow of the high-pressure gas used for testing and the airflow of the injected oil mist, the mixing uniformity between the oil mist and the high-pressure gas used for testing is effectively improved, thereby effectively improving the accuracy of the test results of the oil-gas separator filter element under test.

[0040] Furthermore, the outlet of the front bypass pipe 1 extends tangentially into the interior of the oil-gas tank 6, meaning the high-pressure gas for testing enters the first annular channel 11 tangentially, causing the high-pressure gas to undergo centrifugal motion within the first annular channel 11. The atomizing nozzle 4 is located at the lower part of the bottom end of the coarse separator inner baffle 10. In a preferred embodiment of this application, the distance h between the atomizing nozzle 4 and the bottom end of the coarse separator inner baffle 10 is ≥30mm. The atomizing nozzle 4 is inclined relative to the axis of the oil-gas tank 6, and the outlet of the atomizing nozzle 4 faces the bottom of the oil-gas tank 6. In a preferred embodiment of this application, the included angle α between the atomizing nozzle 4 and the axis of the oil-gas tank 6 ranges from 30° to 60°, so that when the high-pressure gas for testing leaves the atomizing nozzle 4, the oil mist sprayed from the atomizing nozzle 4 is directed towards the bottom of the oil-gas tank 6. The high-pressure gas used for testing is fully mixed before flowing upwards to the air inlet of the oil-gas separator filter element 7 under test. In addition, placing the atomizing nozzle 4 at the lower part of the bottom of the coarse separator inner baffle 10 ensures that the oil mist sprayed from the atomizing nozzle 4 will not collide with the coarse separator inner baffle 10, thus avoiding a reduction in the atomization effect of the oil mist due to impact. Moreover, after the high-pressure gas used for testing rotates several times along the first annular channel 11, the flow rate of the high-pressure gas used for testing decreases, thereby reducing the impact of the high-pressure gas used for testing on the oil mist when it comes into contact with it, further ensuring that the atomization effect of the oil mist is not significantly affected. Since the high-pressure gas used for testing undergoes centrifugal motion around the first annular channel 11, after contacting the oil mist, the high-pressure gas used for testing will drive the oil mist to continue to undergo centrifugal motion, thereby accelerating the mixing speed and uniformity of the oil mist and the high-pressure gas used for testing.

[0041] The inlet of the test oil delivery branch 2 is connected to a test oil storage container 13 with heating and heat preservation functions. The test oil storage container 13 can have a heating element installed inside the oil tank, or the oil tank can be placed in another container containing a heating medium to heat the oil in the tank. In this application, the test oil storage container 13 is preferably a constant temperature oil pan. The temperature range of the heated test oil is the same as the actual exhaust temperature range of different models of air compressors, so as to further simulate the real working conditions of different models of air compressors. As a preferred embodiment of this application, the temperature range of the heated test oil is 70°C to 90°C.

[0042] The second high-pressure gas delivery branch 3 is equipped with a pressure regulating valve 23 for adjusting the high-pressure gas pressure. When the flow rate of the test oil changes, the pressure of the high-pressure gas delivered through the second high-pressure gas delivery branch 3 is adjusted to match the flow rate of the test oil, thereby improving the atomization effect of the test oil. In addition, the atomized oil mist is directly sprayed into the oil-gas tank 6, with good uniformity of atomized particle size, and the atomization effect is not affected by other pipelines. The atomizing nozzle 4 uses an existing product, and this application does not modify the specific structure of the atomizing nozzle 4.

[0043] If a high-pressure blower is added to the end of the front bypass pipe 1 away from the oil and gas tank 6, the design cost of the experimental device will increase. Therefore, this application prefers to connect the end of the front bypass pipe 1 away from the oil and gas tank 6 to the air compressor 14. The oil content of the high-pressure gas discharged from the outlet of the air compressor 14 is ≤3ppm, which can be ignored. That is, the gas introduced into the front bypass pipe 1 can be considered to be relatively clean and will not affect the test results of the oil-gas separation filter element 7 to be tested.

[0044] Specifically, a second oil-gas separator filter element 15 is provided inside the air compressor 14. The gas in the air compressor 14 passes through the second oil-gas separator filter element 15 and then enters the front bypass pipeline 1. The second oil-gas separator filter element 15 is connected to one port of the three-way valve 16. The other two ports of the three-way valve 16 are connected to the front bypass pipeline 1 and the main exhaust pipeline 17, respectively. When testing, the three-way valve 16 is controlled to connect the outlet of the second oil-gas separator filter element 15 to the front bypass pipeline 1, so as to deliver the high-pressure gas for testing to the oil-gas tank 6. When not testing, the three-way valve 16 is controlled to connect the outlet of the second oil-gas separator filter element 15 to the main exhaust pipeline 17. At this time, the high-pressure gas is used for other purposes.

[0045] The exhaust port of the oil-gas separator filter element 7 under test is connected to the rear bypass pipe 18. The other end of the rear bypass pipe 18 is connected to the main exhaust pipe 17. The rear bypass pipe 18 is equipped with a switch valve 19 for controlling the opening and closing of the rear bypass pipe 18. When testing, the switch valve 19 is opened to connect the rear bypass pipe 18 and the main exhaust pipe 17, so that the gas discharged from the oil-gas separator filter element 7 under test enters the main exhaust pipe 17 for other purposes, avoiding the waste caused by directly discharging the separated gas. When not testing, the switch valve 19 is closed to prevent the gas in the main exhaust pipe 17 from entering the rear bypass pipe 18 and affecting the working efficiency of other equipment connected to the main exhaust pipe 17.

[0046] Furthermore, the air compressor 14 is an oil-injected screw variable frequency air compressor. The change in exhaust volume is controlled by adjusting the operating frequency of the air compressor 14. A higher frequency results in a higher load rate and a larger exhaust volume of the air compressor 14, while a lower frequency results in a lower load rate and a smaller exhaust volume of the air compressor 14. The exhaust volume is directly proportional to the flow rate of the second oil-gas separator filter element 15, thereby achieving quantitative and controllable adjustment of the flow rate parameter of the second oil-gas separator filter element 15. A vortex flow meter 20 is installed on the front bypass pipeline 1 to monitor the gas flow rate.

[0047] An adjustable second switch valve is installed at the exhaust port of the air compressor 14. The change in exhaust pressure is controlled by adjusting the opening size of the second switch valve. When the valve is opened wide, the exhaust pressure is low, and when the valve is closed narrow, the exhaust pressure is high, thereby achieving quantitative and controllable adjustment of the gas pressure of the second oil-gas separator filter element 15.

[0048] The cooling fan inside the air compressor 14 is connected to the control device, which is used to control the start and stop temperature of the cooling fan. By adjusting the start and stop temperature of the cooling fan, the change in gas exhaust temperature is controlled. A high start and stop temperature setting results in a high exhaust temperature, and a low start and stop temperature setting results in a low exhaust temperature, thereby achieving controllable adjustment of the gas exhaust temperature of the second oil-gas separator filter element 15.

[0049] By precisely adjusting the flow rate, pressure, and temperature of the high-pressure gas used for testing, as well as the concentration of the oil mist used for testing, the difference between the test conditions and the actual operating conditions of different models of air compressors can be further reduced. This provides more reliable and accurate data support for the design and development of oil-gas separator filter elements, which helps to improve the quality and performance of the developed products.

[0050] Furthermore, the testing system also includes precision pressure gauges 21. One precision pressure gauge 21 is installed at the inlet and outlet of the oil-gas separator filter element 7 under test, respectively, to detect the increase in pressure difference after the filter element 7 is wetted by oil mist. The experimental apparatus also includes an oil return collection tank 22, which is connected to the oil-gas separator filter element 7 under test. The lubricating oil that coalesces on the filter element 7 is discharged to the oil return collection tank 22 through the oil return pipe for recovery.

[0051] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A test device for simulating the working conditions of an oil-gas separator filter element, characterized in that: This includes a high-pressure gas supply system, a variable-concentration oil mist supply system, an oil-gas separation system to be tested, and a detection system. The high-pressure gas supply system includes a front bypass pipeline for delivering high-pressure gas for testing. The variable concentration oil mist supply system includes a test oil delivery branch, a second high-pressure gas delivery branch, and an atomizing nozzle. The test oil delivery branch is equipped with a flow regulating device for adjusting the amount of oil delivered. The test oil delivery branch is connected to the oil inlet of the atomizing nozzle, and the second high-pressure gas delivery branch is connected to the air inlet of the atomizing nozzle. Under the action of high-pressure gas, the test oil is atomized into oil mist. The oil-gas separation system to be tested includes an oil-gas tank and an oil-gas separation filter element to be tested installed in the oil-gas tank. The oil-gas separation filter element to be tested has an air inlet and an air outlet. An oil-gas mixing space is formed between the oil-gas tank and the oil-gas separation filter element to be tested. The air outlet of the front bypass pipe, the outlet of the atomizing nozzle, and the air inlet are all connected to the oil-gas mixing space so that the oil mist and the high-pressure gas for testing are first mixed in the oil-gas mixing space, and then enter the interior of the oil-gas separation filter element to be tested through the air inlet. The detection system includes an exhaust oil content testing device, which is connected to the exhaust port to detect the oil content concentration in the gas after it has been treated by the oil-gas separator filter element to be tested. The oil and gas tank is also equipped with a coarse separation inner baffle. The coarse separation inner baffle is installed on the top cover of the oil and gas tank. The axial length of the coarse separation inner baffle is greater than the axial length of the oil and gas separation filter element to be tested. A first annular channel for high-pressure gas flow is formed between the coarse separation inner baffle and the oil and gas tank. A second annular channel for mixed oil and gas flow is formed between the coarse separation inner baffle and the oil and gas separation filter element to be tested. The outlet of the front bypass pipe is connected to the upper end of the first annular channel. The lower end of the first annular channel is connected to the oil and gas mixing space. The outlet of the atomizing nozzle is located below the outlet of the front bypass pipe, so that the high-pressure gas for testing flows downward and mixes with the oil mist, and then flows upward to enter the interior of the oil and gas separation filter element to be tested. The outlet of the front bypass pipeline extends tangentially into the interior of the oil and gas tank.

2. The oil-gas separator filter element simulated working condition test device according to claim 1, characterized in that: The oil-gas mixing space is located at the bottom of the oil-gas separator filter element under test. After the oil mist and the high-pressure gas for testing are mixed in the oil-gas mixing space, they flow upward to enter the interior of the oil-gas separator filter element under test through the air inlet.

3. The oil-gas separator filter element simulated working condition test device according to claim 2, characterized in that: The air inlet is located on the outer circumferential surface of the oil-gas separator filter element to be tested, the exhaust port is located at the end of the oil-gas separator filter element to be tested, and the end of the oil-gas separator filter element to be tested with the exhaust port is connected to the top cover of the oil-gas tank.

4. The oil-gas separator filter element simulated working condition test device according to claim 3, characterized in that: The atomizing nozzle is located at the lower part of the bottom end of the coarse separator inner baffle. The atomizing nozzle is inclined relative to the axis of the oil and gas tank, and the outlet of the atomizing nozzle faces the bottom of the oil and gas tank.

5. The oil-gas separator filter element simulated working condition test device according to any one of claims 1 to 4, characterized in that: The inlet of the test oil delivery branch is connected to a test oil storage container with heating and heat preservation functions. The temperature range of the heated test oil is the same as the actual exhaust temperature range of different models of air compressors.

6. The oil-gas separator filter element simulated working condition test device according to claim 5, characterized in that: A pressure regulating valve for adjusting the pressure of high-pressure gas is installed on the second high-pressure gas transmission branch.

7. The oil-gas separator filter element simulated working condition test device according to any one of claims 1 to 4, characterized in that: The end of the front bypass pipeline away from the oil and gas tank is connected to the air outlet of the air compressor, and the oil content of the high-pressure gas discharged from the air compressor outlet is ≤3ppm.

8. The oil-gas separator filter element simulated working condition test device according to claim 7, characterized in that: The high-pressure gas supply system also includes a second oil-gas separator filter element, a three-way valve, a main exhaust pipe, a rear bypass pipe, and a switching valve. The second oil-gas separator filter element is located inside the air compressor, and the outlet of the second oil-gas separator filter element is connected to the front bypass pipe and the main exhaust pipe through the three-way valve. The exhaust port of the oil-gas separator filter element under test is connected to the rear bypass pipeline, and the other end of the rear bypass pipeline is connected to the main exhaust pipeline through the switch valve.

9. The oil-gas separator filter element simulated working condition test device according to claim 8, characterized in that: The air compressor is an oil-injected screw variable frequency air compressor. An adjustable second switch valve is installed at the exhaust port of the air compressor. The cooling fan of the air compressor is connected to a control device, which is used to regulate the start and stop temperature of the cooling fan.

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