Centrifugal ventilator performance testing device and testing method

Abstract

The invention discloses a centrifugal ventilator performance testing device and testing method, and belongs to the field of aerospace engine lubrication. According to the technical scheme, the device comprises a test cavity used for installing a centrifugal ventilator; the oil mist generation unit is arranged above the test cavity and is used for lubricating oil atomization and oil-gas mixing; the air supply unit is used for conveying air; the lubricating oil circulating unit comprises an oil filter, a main oil valve and a metering oil pump which are communicated in sequence; the oil mist collecting unit is connected with the air outlet and used for collecting oil mist which is not successfully separated by the centrifugal ventilator; and the weighing unit is used for integrally weighing the test cavity, the oil mist generation unit and the lubricating oil circulation unit. The system is applied to the aspect of centrifugal ventilator performance testing, lubricating oil in the whole system is circulated through the lubricating oil circulation unit, so that the consumption of the lubricating oil is reduced, overall weighing comparison of the lubricating oil pipeline and the test cavity in the whole system is achieved, and the problem of separation efficiency testing errors caused by residual oil in an oil way is solved.

Description

Technical Field

[0001] This invention belongs to the field of aerospace engine lubrication, and particularly relates to a centrifugal ventilator performance testing device and testing method. Background Technology

[0002] Centrifugal ventilators, as a crucial component of the lubricating oil ventilation subsystem of aero-engines, are typically located in the accessory casing or bearing cavity, situated at a critical flow path node between the chamber and the external environment. They are used to separate the oil-gas two-phase mixture, thereby reducing lubricating oil consumption, maintaining bearing cavity pressure, and improving system economy and reliability. In the performance evaluation of centrifugal ventilators, separation efficiency and flow resistance are two key indicators. Separation efficiency directly affects the lubricating oil recovery effect; insufficient separation efficiency will lead to excessive lubricating oil consumption, thus affecting the engine's endurance. Flow resistance relates to the pressure control of upstream structures in the ventilation flow path (such as sealing cavities, bearing cavities, and oil pans); excessive pressure can cause grate seal failure, significantly impacting the oil supply and return balance of the lubricating oil system. Therefore, to improve the working performance of centrifugal ventilators and meet the overall engine design requirements, performance tests must be conducted during the design phase to verify separation efficiency and flow resistance, ensuring that they achieve the expected technical specifications under actual operating conditions.

[0003] The mainstream testing method for the separation efficiency of centrifugal fans currently available involves setting up an oil supply tank, an oil collection tank, and an oil mist collection unit to measure the separation efficiency. Specifically, oil is supplied to the test chamber through the oil supply tank. The weight of the separated oil is obtained through the oil collection tank, the weight of the unseparated oil is obtained through the oil mist collection unit, and the weight of the oil mist entering the chamber is obtained through the oil supply tank. The separation efficiency is obtained by the ratio of the supplied oil volume to the collected oil volume, and corrections are made using the oil mist collection unit. Because existing products use centrifugal fans with high separation efficiency, a long time is required to obtain a noticeable effect, and the large oil volume makes it impossible to weigh the entire volume. Therefore, residual oil in the oil path during the oil delivery process cannot be accounted for, leading to measurement errors. Summary of the Invention

[0004] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0005] This invention proposes a centrifugal ventilator performance testing device and method, which solves the technical problems of current centrifugal ventilator performance testing devices not being able to meet the required rotation speed and not taking into account the weight of residual lubricating oil in the pipes inside the cavity. It features high testing accuracy.

[0006] This invention discloses a centrifugal ventilator performance testing device, comprising: The test chamber is used to install a centrifugal ventilator; the top of the test chamber is equipped with an oil-gas mixture inlet and an air inlet, the side of the test chamber is equipped with a lubricating oil inlet and an air outlet, and the bottom is equipped with a lubricating oil outlet; An oil mist generating unit is located above the test chamber and is used for lubricating oil atomization and oil-gas mixing. The oil mist generating unit is connected to the oil-gas mixture inlet. The air supply unit is used to transport gas. The air supply unit has two air paths. The first path enters the test chamber through the air inlet for oil-gas mixing and purging the observation window on the side of the chamber. The second path enters the oil mist generation unit and mixes with the oil mist to obtain an oil-gas mixture. The lubricating oil circulation unit includes an oil filter, a main oil valve, and a metering oil pump connected in sequence. The oil filter is connected to the lubricating oil outlet and is used to filter impurities in the oil. The main oil valve is used to control the total oil flow rate, and the metering oil pump is used to drive the flow of oil in the entire oil circuit. The oil coming out of the metering oil pump is divided into two paths. The first path returns from the lubricating oil inlet to the test chamber for lubricating the bearings, and the second path enters the oil mist generation unit for lubricating oil atomization and oil-air mixing. The oil mist collection unit, connected to the air outlet, is used to collect oil mist that was not successfully separated by the centrifugal ventilator. The weighing unit is used to weigh the test chamber, oil mist generation unit, and lubricating oil circulation unit as a whole.

[0007] In some embodiments, the oil mist generating unit includes an atomizing nozzle and an oil-gas mixing assembly; The oil-gas mixing assembly includes a hollow cylindrical base, one end of which is open and connected to the test chamber; the other end is connected to a threaded mounting hole for installing an atomizing nozzle and several quick-connect fittings that serve as air inlets, with the threaded mounting holes distributed around the threaded mounting hole.

[0008] In some embodiments, the oil from the metering oil pump is divided into two paths. The first path returns to the cavity via multiple first branch oil valves to lubricate the bearings, while the second path enters the atomizing nozzle for mixing via an oil flow meter, a second branch oil valve, and an oil pressure gauge.

[0009] In some embodiments, the air supply unit includes an air source, a dryer, a main air flow meter, and an air pressure gauge connected in sequence. Gas flows out from the air source, is dried by the dryer, and then passes through the main air flow meter and the air pressure gauge in sequence to observe the overall air volume and air pressure entering the test chamber. The air path is then divided into two paths. The first path includes two branches. The first branch mixes oil and gas through a quick-connect fitting on the oil-gas mixing assembly and oil mist. The second branch directly enters the test chamber to purge the observation window on the side of the chamber. The second path enters the atomizing nozzle after passing through the second air flow meter and the second air valve to atomize the oil from the oil path.

[0010] In some embodiments, an antifoaming plate is also provided inside the test chamber to divide the test chamber into an upper test section and a lower oil tank section; The test section is equipped with a hollow main shaft that rotates within it, and a transmission assembly that drives the main shaft to rotate is installed outside the test chamber. A centrifugal ventilator is installed at one end of the main shaft and rotates with the main shaft. An air outlet is provided at the end of the main shaft away from the centrifugal ventilator.

[0011] In some embodiments, a drive shaft is also rotatably installed in the test section. The drive shaft and the main shaft are driven by a flat shaft drive. The transmission assembly drives the drive shaft to rotate, thereby driving the main shaft to rotate. The transmission assembly includes a motor, a synchronous belt, a driving pulley, and a driven pulley; the driving pulley is mounted on the output shaft of the motor to drive the driving pulley to rotate; the synchronous belt is mounted on the driving pulley and the driven pulley to enable the driving pulley and the driven pulley to drive each other via the synchronous belt; the driven pulley is mounted on the transmission shaft, and the two are connected by a square key.

[0012] In some embodiments, a drive side cover is detachably connected to one side of the test chamber, and an outlet side cover is detachably connected to the other side, wherein the drive side cover is located on the side of the test chamber near the driven wheel, and the outlet side cover is located on the side of the test chamber near the air outlet. A bearing is installed inside the drive side cover, and the drive shaft is rotatably connected to the drive side cover through the bearing; a straight quick connector is provided on the drive side cover as the first lubricating oil inlet to supply oil for lubricating the bearing; A bearing is installed inside the outlet side cover. The end of the drive shaft away from the transmission shaft is rotatably connected to the outlet side cover through the bearing. A quick-connect fitting is provided on the outlet side cover as a second lubricating oil inlet to supply oil for lubricating the bearing.

[0013] In some embodiments, an observation window is provided on the side of the test chamber. The observation window includes an observation window cover and explosion-proof glass. The observation window cover is used to install the explosion-proof glass on the test chamber. A first sealing ring is provided between the explosion-proof glass and the test chamber. Pressure sensors and explosion-proof valves are installed on the top of the test chamber.

[0014] In a second aspect, the present invention provides a method for testing the separation efficiency of a centrifugal ventilator using the aforementioned centrifugal ventilator performance testing device, comprising the following steps: Step 1: Before connecting the transmission assembly, air supply unit and test chamber, use the weighing unit to test the initial mass M1 of the test chamber, oil mist generation unit and lubricating oil circulation unit before the test. Step 2: Connect the transmission assembly, air supply unit and test chamber, and install the centrifugal ventilator to be tested inside the test chamber; Step 3: Simulate the working state of the centrifugal ventilator. Drive the centrifugal ventilator using the transmission component to simulate the working state of the centrifugal ventilator inside the aircraft engine. Use the air supply unit to deliver gas, use the lubricating oil circulation unit to deliver lubricating oil and provide power for the lubricating oil circulation, and use the oil mist generating device to atomize the lubricating oil. Step 4: After the centrifugal ventilator under test has been running stably for a period of time, stop the gas and lubricating oil supply, separate the transmission components, air supply unit and test chamber, and use the weighing unit to test the mass M2 of the test chamber, oil mist generation unit and lubricating oil circulation unit after the test. Step 5: Calculate the total amount of oil Q1 entering the test chamber based on the flow rate of the oil flow meter and the test time. The test time is t, and the flow rate of the oil flow meter is q. Then the total amount of oil entering the chamber is Q1 = qt. If the change in oil quality before and after the experiment is Δm, then the amount of oil separated and recovered is Q2 = Q1 - Δm; therefore, the separation efficiency is... .

[0015] A third aspect of the present invention provides a method for testing the flow resistance of a centrifugal ventilator using the above-described centrifugal ventilator performance testing apparatus, comprising the following steps: Simulate the working state of a centrifugal ventilator, drive the centrifugal ventilator using a transmission component, simulate the working state of a centrifugal ventilator inside an aircraft engine, use an air supply unit to deliver gas, use an oil circulation unit to deliver lubricating oil and provide power for the oil circulation, and use an oil mist generating device to atomize the lubricating oil. According to the pressure gauge, the chamber pressure P1 of the test chamber and the pressure P2 at the air outlet are tested; according to the pressure gauge (68), the flow resistance of the centrifugal ventilator is ΔP = P1 - P2.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a centrifugal ventilator performance testing device. By circulating the lubricating oil in the entire system through a lubricating oil circulation unit, the lubricating oil consumption is reduced. This allows for overall weighing and comparison of the lubricating oil pipelines and test chambers in the entire system, eliminating the error problem in separation efficiency testing caused by residual oil in the oil circuit, thereby improving measurement accuracy. It adopts synchronous belt drive and servo speed control motor, and the speed can be adjusted by changing the pulley. It has strong versatility and a wide speed range. The synchronous belt can be removed during weighing, thereby reducing the weight of the tested part and improving the test accuracy. It can be adapted to different centrifugal ventilators by changing the drive shaft. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the centrifugal ventilator performance testing device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the test chamber provided in an embodiment of the present invention; Figure 3 This is a front cross-sectional view of the test chamber provided in an embodiment of the present invention; Figure 4 This is a side cross-sectional view of the test chamber provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the oil-gas blending component provided in an embodiment of the present invention; Attached image description: 1. M8 nut; 2. Driven wheel; 3. Square key; 4. Drive shaft; 5. Retaining ring for bore; 6. Double bearing; 7. Bearing gasket; 8. First lubricating oil inlet; 9. Shaft seal; 10. Drive side cover; 11. First hexagon socket head cap screw; 12. Second sealing ring; 13. Third sealing ring; 14. Upper end cover; 16. Oil-gas mixing assembly; 17. Fourth sealing ring; 18. Second hexagon socket head cap screw; 19. Main shaft; 20. Outlet bearing; 21. Test chamber; 22. Fifth sealing ring; 23. Outlet side cover; 24. Third hexagon socket head cap screw; 26. Defoaming plate; 27. Bolt support; 28. Sixth sealing ring; 29. ​​Temperature sensor; 30. Heater; 31. Centrifugal ventilator; 32. Main shaft drive bearing; 33. Flat shaft; 35. Lubricating oil outlet; 36. Observation window cover; 37. Explosion-proof glass; 38. Pressure sensor; 40. First sealing ring; 41. Oil circuit flow meter; 42. Metering oil pump; 43. Main oil valve; 44. Oil filter; 48. Motor; 49. Second branch oil valve; 50. Oil circuit pressure gauge; 51. Atomizing nozzle; 52. Second air valve; 53. Second air circuit flow meter; 54. First air valve; 55. Air circuit pressure gauge; 56. Total air circuit flow meter; 57. Dryer; 58. Air source; 59. Oil mist collection unit; 60. Explosion-proof valve; 61. Weighing part in the system; 62. First branch oil valve; 63. Second lubricating oil inlet; 64. Air inlet; 66. Mounting base; 67. Oil-air mixing component; 671. Cylindrical seat; 672. Threaded mounting hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0019] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0020] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0021] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," "an," "the," and similar words used in this invention do not indicate quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this invention are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms "connected," "linked," "coupled," and similar words used in this invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "A plurality" used in this invention refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist; for example, "A and / or B" can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects have an "or" relationship. The terms "first," "second," and "third" used in this invention are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0022] Example 1 like Figure 1-5As shown, this embodiment of the invention provides a centrifugal ventilator performance testing device. The device includes at least: a test chamber 21, an oil mist generating unit, an air supply unit, a lubricating oil circulation unit, an oil mist collection unit 59, and a weighing unit. The test chamber 21 serves as the carrier for oil atomization and oil-gas separation, ensuring reliable sealing during the test process. The system's transmission and centrifugal exhaust channels are consistent with those on the machine. The oil mist generating unit is mainly used for lubricating oil atomization, simulating the lubricating oil atomization state on the machine. The air supply unit is mainly used for oil-gas mixing to achieve ventilation and remove moisture from the air. The lubricating oil circulation unit mainly provides power for lubricating oil circulation, realizing circulation-atomization-collection. The oil mist collection unit 59 is mainly used to collect oil mist that was not successfully separated by the centrifugal ventilator 31. The weighing unit performs high-precision weighing of the oil path and chamber, ensuring reliable separation efficiency results. The weighing part 61 in the system includes the test chamber 21, the oil mist generating unit, and the lubricating oil circulation unit.

[0023] refer to Figure 1 As shown, the lubricating oil circulation unit includes an oil filter 44, a main oil valve 43, a metering oil pump 42, an oil flow meter 41, a first branch oil valve 62, a second branch oil valve 49, and an oil pressure gauge 50. All components are connected by hoses. The oil filter 44 is installed outside the oil tank at the bottom of the test chamber 21 to filter impurities in the oil. The main oil valve 43 is immediately following it to control the total oil flow. The metering oil pump 42 drives the flow of oil in the entire oil circuit. The oil coming out of the metering oil pump 42 is divided into two paths. The first path returns to the chamber via the first branch oil valve 62 to lubricate the bearings. The second path enters the atomizing nozzle 51 for mixing via the oil flow meter 41, the second branch oil valve 49, and the oil pressure gauge 50. The presence of each branch oil valve can control the flow of each branch and the flow entering the mixing device, thereby controlling the proportion of oil in the oil-air mixture entering the test chamber 21. On the other hand, the pressure change can be observed through the oil pressure gauge 50 to control the atomization effect.

[0024] An air supply unit is used to transport gas. The air supply unit includes a gas source 58, a dryer 57, a main gas flow meter 56, and a gas pressure gauge 55 connected in sequence. Gas flows out of the gas source 58 and passes through the dryer 57 to remove moisture from the gas source 58, preventing moisture from being mixed into the oil-gas mixture. Then, the gas passes through the main gas flow meter 56 and the gas pressure gauge 55. The main gas flow meter 56 can observe the total amount of gas entering the cavity, and the gas pressure gauge 55, following the main gas flow meter 56, can observe the pressure in the gas path. The pressure of the control branch is used to control the atomization effect. The gas path then splits into two paths. The first path includes two branches. The first branch mixes oil and gas through a quick-connect fitting on the oil-gas mixing assembly 67. The second branch directly enters the test chamber 21 to purge the side observation window, preventing oil mist from condensing and affecting the particle size analyzer's results. The second branch, after passing through the second gas flow meter 53 and the second gas valve 52, enters the atomizing nozzle 51 to atomize the oil from the oil path, and then enters the oil-gas mixing assembly for further mixing. The oil-gas mixture after mixing by the oil-gas mixing assembly enters the test chamber 21.

[0025] like Figure 2-5 As shown, the oil mist generating unit is located above the test chamber 21 and is used for lubricating oil atomization and oil-gas mixing. The oil mist generating unit is connected to the oil-gas mixture inlet. The oil mist generating unit includes an atomizing nozzle 51 and an oil-gas mixing assembly 67. The oil-gas mixing assembly 67 includes a hollow cylindrical seat 671. One end of the cylindrical seat 671 is open and connected to the test chamber 21. The other end is connected to a threaded mounting hole 672 for mounting the atomizing nozzle 51 and six quick-connect fittings that serve as air inlets 64. The threaded mounting holes 672 are distributed around the threaded mounting holes 672.

[0026] Through the above structural design, the oil-gas mixing component 67 of this invention, adapted to the performance testing device of the centrifugal ventilator 31, abandons the independent mixing chamber and delivery pipeline in traditional testing, and adopts a design that is directly integrated into the test chamber 21. This effectively avoids the problem of oil mist adhering to the wall during the delivery process, thereby improving the stability and accuracy of maintaining the oil-gas mixing ratio, and thus improving the measurement accuracy of performance testing under the set oil-gas ratio conditions. On the other hand, this mixing component, by designing a hollow cylindrical base 671 as an extended mixing chamber, and combining it with the air intake method of six circumferentially distributed straight quick connectors, provides sufficient mixing space and uniformly distributed airflow for oil-gas mixing, thereby effectively improving the uniformity of oil-gas mixing.

[0027] The test chamber 21 is used to install the centrifugal ventilator 31; the top of the test chamber 21 is provided with an oil-gas mixture inlet and an air inlet 64, the side of the test chamber 21 is provided with a lubricating oil inlet and an air outlet, and the bottom is provided with a lubricating oil outlet 35.

[0028] like Figure 2-4As shown, the test chamber 21 is also equipped with a defoaming plate 26, which divides the test chamber 21 into an upper test section and a lower oil tank section.

[0029] Specifically, a defoaming plate 26 is provided on the lower side of the test chamber 21 to isolate the test section and the oil tank section and to eliminate bubbles caused by the high-speed rotation of the centrifugal ventilator 31. The defoaming plate 26 is supported by eight bolt supports 27 equidistantly arranged axially on the test chamber 21. The bolt supports 27 are equipped with a sixth sealing ring 28 to ensure the sealing of the test chamber 21. A heater 30 is provided in the oil tank to achieve testing at different temperatures and to ensure the fluidity of the oil. In addition, a temperature sensor 29 is installed on the side of the oil tank to monitor the temperature inside the oil tank in real time.

[0030] In this embodiment, a hollow main shaft 19 is rotatably installed inside the test section, and a transmission assembly for driving the main shaft 19 to rotate is installed outside the test chamber 21. A centrifugal ventilator 31 is installed at one end of the main shaft 19, and the centrifugal ventilator 31 rotates together with the main shaft 19. An air outlet is opened at the end of the main shaft 19 away from the centrifugal ventilator 31. A transmission shaft 4 is also rotatably installed inside the test section. The transmission shaft 4 and the main shaft 19 are driven by a flat shaft 33. The transmission assembly drives the main shaft 19 to rotate by driving the transmission shaft 4 to rotate. The transmission assembly includes a motor 48, a synchronous belt, a drive pulley, and a driven pulley 2. The drive pulley is sleeved on the output shaft of the motor 48 to drive the drive pulley to rotate. The synchronous belt is sleeved on the drive pulley and the driven pulley 2 so that the drive pulley and the driven pulley 2 are driven by the synchronous belt. The driven pulley 2 is sleeved on the transmission shaft 4, and the two are connected by a square key 3.

[0031] Specifically, the cavity includes an M8 nut 18 for mounting the driven wheel 2, providing axial fixation. The driven wheel 2 connects the motor 48 and the main shaft 19. A square key 3 connects the driven wheel 2 and the drive shaft 4. The drive shaft 4 uses a double bearing 6 arranged in parallel to provide radial positioning and prevent excessive vibration under high-speed rotation from damaging the cavity. A retaining ring 5 with a hole is provided on the outside of the bearing mounting position to provide axial positioning of the bearing. A bearing washer 7 is placed between the two bearings to reduce friction between them. The drive shaft 4 and the main shaft 19 are connected by a flat shaft 33 to meet the requirements of high-speed transmission and reduced vibration. A shaft seal 9 is installed on the outside of the main shaft drive bearing 32 to ensure the sealing of the drive side.

[0032] In this embodiment, a drive side cover 10 is detachably connected to one side of the test chamber 21, and an outlet side cover 23 is detachably connected to the other side. The drive side cover 10 is located on the side of the test chamber 21 near the driven wheel 2, and the outlet side cover 23 is located on the side of the test chamber 21 near the air outlet. A bearing is installed inside the drive side cover 10, and the drive shaft 4 is rotatably connected to the drive side cover 10 through the bearing. A quick-connect fitting is provided on the drive side cover 10 as a first lubricating oil inlet 8 for supplying oil to lubricate the bearing. A bearing is installed inside the outlet side cover 23, and the end of the drive shaft away from the drive shaft 4 is rotatably connected to the outlet side cover 23 through the bearing. A quick-connect fitting is provided on the outlet side cover 23 as a second lubricating oil inlet 63 for supplying oil to lubricate the bearing.

[0033] Specifically, to facilitate the replacement of different centrifugal fans 31, a drive side cover 10, an outlet side cover 23, and a mounting base 66 are provided. The drive side cover 10 is equipped with a quick-connect fitting as the first lubricating oil inlet 8 for supplying oil to lubricate the bearing. The bearing cover is connected to the test chamber 21 by a hexagonal head screw, and the chamber is sealed by a third sealing ring 13. The main shaft 19 is positioned by the drive bearing and the outlet bearing 20 to ensure concentricity under high-speed rotation and reduce vibration. The outlet side cover 23 is connected to the chamber by a third hexagonal head screw 24, and the chamber is sealed by a fifth sealing ring 22. The outlet side cover 23 is also equipped with a quick-connect fitting as the second lubricating oil inlet 63 for supplying oil to lubricate the bearing, and the outlet bearing 20 is installed by interference fit to cooperate with the drive bearing to position the main shaft 19.

[0034] Specifically, the upper end cover 14 is also connected to the cavity via the first internal hexagonal head screw 11, and the cavity is sealed by the second sealing ring 12. An oil-gas mixing assembly is provided in the center of the upper end cover 14. An atomizing nozzle 51 is provided in the center of the oil-gas mixing assembly, and six straight quick connectors are provided equidistantly around the atomizing nozzle 51 as air inlets 64, which are used to mix the gas with the oil mist sprayed from the atomizing nozzle before entering the test cavity 21. The oil-gas mixing assembly is connected to the upper end cover 14 via the second internal hexagonal head screw 18, and the cavity is sealed by the fourth sealing ring 17.

[0035] In this embodiment, an observation window is provided on the side of the test chamber 21. The observation window includes an observation window cover 36 and an explosion-proof glass 37. The observation window cover 36 is used to install the explosion-proof glass 37 on the test chamber 21. A first sealing ring 40 is provided between the explosion-proof glass 37 and the test chamber 21. A pressure sensor 38 and an explosion-proof valve 60 are installed on the top of the test chamber 21.

[0036] Specifically, the observation window consists of an observation window cover 36 and an explosion-proof glass 37 installed at the same position on the opposite side of the test chamber 21. Both are connected to the test chamber 21 via hexagonal head screws, and the first sealing ring 40 ensures the sealing of the chamber. The opposite side is the same. The test chamber 21 is equipped with an explosion-proof valve 60 on its top cover to ensure safety. A pressure sensor 38 is installed on the side of the test chamber 21 to test the chamber pressure. A quick-connect fitting is provided on the oil tank side of the lower side of the test chamber 21 as an oil outlet 35 to connect with the oil circulation unit to realize the circulation of the entire operating cycle of the oil.

[0037] Working principle: The oil filter 44 is installed outside the oil tank at the bottom of the test chamber 21 to filter impurities in the oil. The main oil valve 43 is immediately following it to control the total oil flow. The metering oil pump 42 is used to drive the flow of oil in the entire oil circuit. The oil coming out of the metering oil pump 42 is divided into two paths. The first path returns to the chamber through the first branch oil valve 62 to lubricate the bearing. The second path enters the atomizing nozzle 51 for mixing through the oil flow meter 41, the second branch oil valve 49 and the oil pressure gauge 50. The presence of each branch oil valve can control the flow of each branch and the flow into the mixing device to control the proportion of oil in the oil-air mixture entering the chamber. On the other hand, the pressure change can be observed through the pressure gauge to control the atomization effect. In the gas path section, gas flows out from gas source 58 and passes through dryer 57 to remove moisture contained in gas source 58, preventing moisture from being mixed into the oil-gas mixture. Afterwards, the total gas flow meter 56 can observe the overall gas volume entering the chamber, and the gas pressure gauge 55 after the total gas flow meter 56 can observe the gas pressure to control the branch pressure and thus control the atomization effect. The gas path then splits into two paths: one path enters the test chamber 21 via the first gas valve 54 for oil-gas mixing and purging the side observation window of the chamber to prevent oil mist from condensing in the observation window and affecting the particle size analyzer's analysis results; the other path enters the atomizing nozzle 51 via the second gas flow meter 53 and the second gas valve 52 to atomize the oil from the oil path, and then enters the oil-gas mixing device for mixing. The oil-gas mixture after mixing by the oil-gas mixing device enters the chamber. This achieves lubricating oil circulation, thereby reducing the amount of lubricating oil required to achieve weight reduction, thus improving overall measurement accuracy.

[0038] Example 2 The method for testing the separation efficiency of a centrifugal ventilator using the centrifugal ventilator performance testing device in Example 1 includes the following steps: Step 1: After assembling the test chamber, oil mist generating unit, and lubricating oil circulation unit, installing the centrifugal ventilator to be tested, and adding an appropriate amount of oil, use the weighing unit to test the initial mass M1 of the test chamber, oil mist generating unit, and lubricating oil circulation unit before the test. Step two: Connect the air supply unit, transmission unit, and test chamber; Step 3: Simulate the working state of the centrifugal ventilator. After the centrifugal ventilator is driven to the required speed by the transmission component, the air supply unit delivers gas and the lubricating oil circulation unit delivers lubricating oil and provides power for the lubricating oil circulation. The lubricating oil temperature can be controlled by the heater and temperature sensor in the cavity. The lubricating oil is atomized by the oil mist generating device to simulate the working environment of the centrifugal ventilator. Step 4: After the centrifugal ventilator under test has been running stably for a period of time, stop the gas and lubricating oil supply, separate the transmission components, air supply unit and test chamber, and use the weighing unit to test the mass M2 of the test chamber, oil mist generation unit and lubricating oil circulation unit after the test. Step 5: Calculate the total amount of oil Q1 entering the test chamber based on the flow rate of the oil flow meter and the test time. The test time is t, and the flow rate of the oil flow meter is q. Then the total amount of oil entering the chamber is Q1 = qt. If the change in oil quality before and after the experiment is Δm, then the amount of oil separated and recovered is Q2 = Q1 - Δm; therefore, the separation efficiency is... .

[0039] Example 3 The method for testing the flow resistance of a centrifugal ventilator using the centrifugal ventilator performance testing device in Example 1 includes the following steps: Simulate the working state of a centrifugal ventilator, drive the centrifugal ventilator using a transmission component, simulate the working state of a centrifugal ventilator inside an aircraft engine, use an air supply unit to deliver gas, use an oil circulation unit to deliver lubricating oil and provide power for the oil circulation, and use an oil mist generator to atomize the lubricating oil. After the working state stabilizes. According to the pressure gauge, the chamber pressure P1 of the test chamber and the pressure P2 at the air outlet are tested; according to the pressure gauge (68), the flow resistance of the centrifugal ventilator is ΔP = P1 - P2.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A centrifugal ventilator performance testing device characterized by, The utility model relates to a test device for centrifugal ventilator, comprising: a test cavity for installing the centrifugal ventilator; the top of the test cavity is provided with an oil-gas mixture inlet and an air inlet; the side of the test cavity is provided with an oil inlet and an air outlet; and the bottom of the test cavity is provided with an oil outlet; an oil mist generating unit arranged above the test cavity for oil mist atomization and oil-gas mixing; the oil mist generating unit is connected with the oil-gas mixture inlet; an air supply unit for conveying air; the air path of the air supply unit is divided into two paths; the first path enters the test cavity through the air inlet for oil-gas mixing and purging the side observation window of the test cavity; the second path enters the oil mist generating unit for mixing with the oil mist to obtain the oil-gas mixture; an oil circulation unit comprising an oil filter, a main oil valve and a metering oil pump connected in sequence; the oil filter is connected with the oil outlet for filtering impurities in the oil; the main oil valve is used for controlling the flow of the total oil path; and the metering oil pump is used for driving the flow of the oil in the whole oil path; the oil discharged from the metering oil pump is divided into two paths; the first path returns to the test cavity through the oil inlet for lubricating the bearing; and the second path enters the oil mist generating unit for oil mist atomization and oil-gas mixing; an oil mist collecting unit connected with the air outlet for collecting the oil mist that is not successfully separated by the centrifugal ventilator; a weighing unit for weighing the test cavity, the oil mist generating unit and the oil circulation unit as a whole.

2. The centrifugal ventilator performance test device of claim 1, wherein, The oil mist generating unit comprises an atomizing nozzle and an oil-gas mixing assembly; The oil-gas mixing assembly comprises a hollow cylindrical seat; one end of the cylindrical seat is open and connected with the test cavity; the other end is connected with a threaded mounting hole for mounting the atomizing nozzle and a plurality of straight-through quick connectors as air inlets; and the plurality of threaded mounting holes are distributed around the threaded mounting hole.

3. The centrifugal ventilator performance test device of claim 2, wherein, The oil discharged from the metering oil pump is divided into two paths; the first path returns to the test cavity through a plurality of first branch oil valves for lubricating the bearing; and the second path enters the atomizing nozzle through an oil path flowmeter, a second branch oil valve and an oil path pressure gauge for mixing.

4. The centrifugal ventilator performance testing device of claim 3, wherein, The air supply unit comprises a gas source, a dryer, a total air path flowmeter and an air path pressure gauge connected in sequence; the gas flows out from the gas source, is dried by the dryer, and then passes through the total air path flowmeter and the air path pressure gauge in sequence to observe the amount of air entering the test cavity as a whole and the pressure of the air path; then the air path is divided into two paths; the first path comprises two branches; the first branch mixes with the oil mist through the straight-through quick connectors on the oil-gas mixing assembly; and the second branch directly enters the test cavity for purging the side observation window of the test cavity; The second path enters the atomizing nozzle through a second air path flowmeter and a second air valve for atomizing the oil from the oil path.

5. The centrifugal ventilator performance testing device of claim 4, wherein, A defoaming plate is arranged in the test cavity to divide the test cavity into an upper test section and a lower oil tank section; A hollow main shaft is rotatably arranged in the test section; a transmission assembly is arranged outside the test cavity to drive the main shaft to rotate; the centrifugal ventilator is mounted on one end of the main shaft and rotates with the main shaft; and an air outlet is formed at the end of the main shaft away from the centrifugal ventilator.

6. The centrifugal ventilator performance testing device of claim 5, wherein, A transmission shaft is also rotatably arranged in the test section; the main shaft and the transmission shaft are connected by a flat shaft transmission; and the transmission assembly drives the transmission shaft to rotate to drive the main shaft to rotate. The transmission assembly comprises a motor, a synchronous belt, a driving wheel and a driven wheel; the driving wheel is sleeved on the output shaft of the motor to drive the driving wheel to rotate; the synchronous belt is sleeved on the driving wheel and the driven wheel to drive the driving wheel and the driven wheel through the synchronous belt; the driven wheel is sleeved on the transmission shaft and connected with the driving wheel through the square key.

7. The centrifugal ventilator performance testing device of claim 5, wherein, One side of the test cavity is detachably connected with a driving side cover, and the other side is detachably connected with an outlet side cover; the driving side cover is arranged on the side of the test cavity close to the driven wheel, and the outlet side cover is arranged on the side of the test cavity close to the air outlet; A bearing is installed in the driving side cover, and the transmission shaft is rotatably connected with the driving side cover through the bearing; a straight-through quick connector is arranged on the driving side cover as a first lubricating oil inlet for lubricating the bearing; A bearing is installed in the outlet side cover, and the end of the driving shaft away from the transmission shaft is rotatably connected with the outlet side cover through the bearing; a straight-through quick connector is arranged on the outlet side cover as a second lubricating oil inlet for lubricating the bearing.

8. The centrifugal ventilator performance testing device of claim 1, wherein, An observation window is arranged on the side of the test cavity; the observation window comprises an observation window cover and an explosion-proof glass; the observation window cover is used for mounting the explosion-proof glass on the test cavity; a first sealing ring is arranged between the explosion-proof glass and the test cavity; A pressure sensor and an explosion-proof valve are installed on the top of the test cavity.

9. A method of testing the separation efficiency of a centrifugal ventilator using the centrifugal ventilator performance test device according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: Step one: before connecting the transmission assembly, the air supply unit and the test cavity, the initial mass M1 of the test cavity, the oil mist generating unit and the lubricating oil circulating unit before the test is tested by using the weighing unit; Step two: the transmission assembly, the air supply unit and the test cavity are connected, and the centrifugal ventilator to be tested is installed in the test cavity; Step three: the working state of the centrifugal ventilator is simulated; the centrifugal ventilator is driven by using the transmission assembly to simulate the working state of the centrifugal ventilator in the aero-engine; the air is transported by using the air supply unit; the lubricating oil is transported and power is provided for the lubricating oil circulation by using the lubricating oil circulating unit; and the lubricating oil is atomized by using the oil mist generating device; Step four: after the centrifugal ventilator to be tested is stably operated for a period of time, the air and lubricating oil transportation are stopped; the transmission assembly, the air supply unit and the test cavity are separated; and the mass M2 of the test cavity, the oil mist generating unit and the lubricating oil circulating unit after the test is tested by using the weighing unit; Step five: the total amount Q1 of the oil entering the test cavity is calculated according to the flow of the oil circuit flowmeter and the experimental time; the experimental time is t; the flow of the oil circuit flowmeter is q; and the total amount Q1 of the oil entering the cavity is qt. The oil mass change before and after the calculation test is Δm, and the oil mass separated and recovered is Q2=Q1-Δm; and the separation efficiency is .

10. A method of testing the flow resistance of a centrifugal ventilator using the centrifugal ventilator performance test device according to any one of claims 1 to 8, characterized in that, The working state of the centrifugal ventilator is simulated; the centrifugal ventilator is driven by using the transmission assembly to simulate the working state of the centrifugal ventilator in the aero-engine; the air is transported by using the air supply unit; the lubricating oil is transported and power is provided for the lubricating oil circulation by using the lubricating oil circulating unit; and the lubricating oil is atomized by using the oil mist generating device; The cavity pressure P1 of the test cavity and the pressure P2 at the air outlet are tested by using the pressure gauge; and the flow resistance ΔP of the centrifugal ventilator is P1-P2. ​

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