An emulsion preparation device and method for aeroengine bearing corrosion test

Abstract

The application discloses an emulsion preparation device and method for corrosion testing of an aero-engine bearing, and belongs to the technical field of aero-engine corrosion testing. An ultrasonic oscillator and a resistance heater are used in the emulsification unit to heat emulsified lubricating oil to a required temperature. The ultrasonic oscillator makes the liquid drops fully diffuse in the oil, and in this process, the water-in-oil is uniformly mixed, so that the liquid drops in the lubricating oil are in a small particle state. The oil bath heating is used to control the lubricating oil temperature, which is helpful to realize the lubricating oil performance testing under multiple temperature fields. The outlet of the end cover of the multiphase flow corrosion unit is connected with the backflow port in the emulsification unit through a pipeline, and backflow oscillation ensures the stability of the emulsion, and solves the instability problem of emulsion settlement and aggregation.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine corrosion testing technology, and relates to an emulsion preparation device and method for corrosion testing of aero-engine bearings. Background Technology

[0002] Carrier-based aircraft need to perform missions in the maritime domain. Moisture and corrosive media in the air are inevitably drawn into the turbine engine by the high-speed airflow, causing lubricating oil contamination. During the circulation of the lubricating oil, there is often a strong mechanical churning effect inside the turbine engine, which turns the contaminated lubricating oil into a mixture containing suspended droplets.

[0003] Because lubricating oil and water are immiscible, the amount dissolved in the oil is extremely small and generally does not cause corrosion problems. However, in studies on the impact of water-contaminated lubricating oil on the stability of engine operation, when the water content in the lubricating oil exceeds its solubility limit, an insoluble second phase will form, precipitating from the oil phase as water droplets of varying sizes. After stirring for a period of time, the droplets will settle and coalesce due to gravity, thus disrupting the uniform distribution of droplets in the original emulsion. This instability makes it difficult to simulate the corrosive effects of water-contaminated lubricating oil on materials under dynamic conditions, increasing the experimental difficulty. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem in the prior art where the sedimentation and aggregation of droplets due to gravity during the stirring process disrupts the uniform distribution of droplets in the original emulsion, making it difficult to simulate the corrosive effect of water-contaminated lubricating oil on materials under motion conditions. The invention provides an emulsion preparation device and method for corrosion testing of aero-engine bearings.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] In a first aspect, the present invention discloses an emulsion preparation device for corrosion testing of aero-engine bearings, including a sampling system and an emulsion corrosion system;

[0007] The sampling system includes two symmetrically arranged vertical guide rails 3; a horizontal guide rail 4 that can move in the vertical direction is slidably connected between the two vertical guide rails 3; a slider 6 that can slide in the horizontal direction is installed on the horizontal guide rail 4, and a sampler 5 is fixedly installed on the slider 6; a turntable 7 is provided below the horizontal guide rail 4.

[0008] The emulsification etching system includes an emulsification unit, a sample injection unit, and a multiphase flow etching unit. The emulsification unit includes an inner cavity and an outer cavity. The outer cavity encloses the inner cavity. An ultrasonic oscillator 18 and a resistance heater 19 are installed inside the outer cavity. An inlet 9 and a reflux port 11 are provided above the inner cavity, and the lower part is connected to the sample injection unit via a bend 20. The sample injection unit includes a pipeline with two one-way valves 12. An injector 13 is connected above the pipeline between the two one-way valves 12. The multiphase flow etching unit includes an accelerating nozzle 14, a sample tray 15, and an end cap 16 fixed in sequence. The sample tray 15 and the end cap 16 are hollow in the middle. The outlet of the end cap 16 is connected to the reflux port 11 via a pipeline.

[0009] Further improvements to the above system are as follows:

[0010] The sampling system also includes a base 1, which is fixedly connected to two vertical guide rails 3 by two fasteners 2 respectively.

[0011] A turntable motor 8 is provided between the base 1 and the turntable 7 to drive the turntable 7 to rotate and the sampler 5 to take samples.

[0012] Several sample slots are formed on the upper surface of the turntable 7.

[0013] An air hole is provided above the inner cavity, and a conductive dust cover 10 is installed on the air hole; the outer cavity is filled with silicone oil.

[0014] The injection unit also includes a pipeline with two one-way valves 12; the two pipelines are connected by a first tee connector 21 and a second tee connector 22; the first tee connector 21 is connected to the bend 20, and the second tee connector 22 is connected to the acceleration nozzle 14.

[0015] The acceleration nozzle 14 is conical in the middle, with a large inlet and a small outlet; the middle part of the acceleration nozzle 14 is made of transparent material.

[0016] The sample plate 15 and the end cap 16 are positioned on the acceleration nozzle 14 by the studs and fastening nuts 17 on the tail end of the acceleration nozzle 14.

[0017] The sample tray 15 and the end cap 16 are sealed with a gasket.

[0018] Secondly, this invention discloses a method for preparing an emulsion using the aforementioned equipment for corrosion testing of aero-engine bearings, comprising the following steps:

[0019] Unscrew the fastening nut 17 on the end cover 16 of the multiphase flow corrosion unit, remove the sample tray 15 and install the sample piece, then close the end cover 16 and tighten the fastening nut 17.

[0020] Place the oil, adulterated liquid and cleaning solution into the sample bottle on the turntable 7, turn on the power, and initialize the position so that the turntable 7 and sampler 5 return to the designated position.

[0021] Set the ratio, quantity, and sampling order of the mixture, execute the program, and wait for sampler 5 to complete the sampling operation;

[0022] Set the ultrasonic vibration frequency, oil bath heating temperature, and initial emulsification time;

[0023] Set the flow rate and corrosion time for multiphase flow corrosion. After the emulsion has completed the set initial emulsification time, it is fed into the multiphase flow corrosion unit to start calculating the corrosion time.

[0024] After the corrosion time reaches the set time, stop the injection, unscrew the fastening nut 17 on the end cover 16 of the multiphase flow corrosion unit, remove the sample from the sample tray 15, clean and store it.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention employs oil bath heating to heat lubricating oil to the required temperature, and then uses ultrasonic oscillation to fully diffuse droplets within the oil until they are stably suspended, forming small water-in-oil particles. This process achieves uniform mixing of the oil and water. The emulsified lubricating oil is drawn in by a sampler and then injected into an accelerating nozzle at a set rate. The emulsified lubricating oil entering the accelerating nozzle washes over the sample surface, and under pressure, it flows back into the emulsification system for re-emulsification. This ensures the uniformity and consistency of the corrosive medium during the sample preparation process and guarantees that the emulsion maintains a specified size without severe instability. It simulates the intense mechanical agitation of actual aviation equipment and provides an experimental basis for studying the corrosion of water-contaminated aviation lubricating oil emulsions.

[0027] Furthermore, the sampling unit of this invention adopts an automated sampling method, achieving rapid sample changing through motor-controlled turntable rotation. Under the coordinated control of guide rails in both the horizontal and vertical directions, the sampler can accurately locate the reagent, avoiding errors caused by human operation.

[0028] Furthermore, the present invention has an air hole at the top of the inner cavity, through which the gas generated during heating and emulsification is discharged to maintain the normal air pressure inside the cavity; a conductive dust cover is installed on the air hole, which can reduce the contamination of the emulsion by the external environment and allow the gas to enter and exit freely; the outer cavity is filled with silicone oil, and the temperature of the lubricating oil is controlled by oil bath heating, which helps to realize the performance testing of lubricating oil under multiple temperature fields.

[0029] Furthermore, the sampling unit of this invention adopts a dual-pipe sampling cycle operation to ensure uninterrupted sampling. The one-way valve in the pipeline can realize unidirectional flow and adjustable speed sampling, making the multiphase flow corrosion conditions more stable.

[0030] Furthermore, the multiphase flow corrosion unit adopts a layered design, reducing the complexity of sample positioning and installation. The accelerating nozzle has a conical shape in the middle, with a large inlet and a small outlet, which can create a higher flow velocity at the tail end of the pipe. The transparent material used in the middle of the accelerating nozzle enables visual operation, and the sample tray is easy to disassemble, clean, and replace. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the equipment structure of an emulsion preparation device and method for corrosion testing of aero-engine bearings according to the present invention;

[0033] Figure 2 This is a schematic diagram of the sampling system structure of an emulsion preparation device for corrosion testing of aero-engine bearings according to the present invention.

[0034] Figure 3 This is a schematic diagram of the emulsion corrosion system structure of an emulsion preparation equipment for corrosion testing of aero-engine bearings according to the present invention;

[0035] Figure 4 This is a schematic diagram of the internal structure of the emulsification unit in the emulsification corrosion system of the present invention;

[0036] Figure 5 This is a cross-sectional view of the emulsification unit AA of the present invention;

[0037] Figure 6 This is a schematic diagram of the sample introduction unit structure of the emulsification corrosion system of the present invention;

[0038] Figure 7 This is a cross-sectional view of the sample inlet unit pipeline of the present invention;

[0039] Figure 8 This is a schematic diagram of the multiphase flow corrosion unit structure of the emulsification corrosion system of the present invention;

[0040] Figure 9 This is a cross-sectional view of the multiphase flow corrosion unit of the present invention;

[0041] Figure 10This is a light microscope image of the water droplet distribution in the emulsion after ultrasonic oscillation at 30°C for 3 hours according to an embodiment of the present invention.

[0042] Figure 11 This is an electron microscope image of the corroded surface of M50 bearing steel according to an embodiment of the present invention;

[0043] Wherein: 1-base; 2-fixer; 3-vertical guide rail; 4-horizontal guide rail; 5-sampler; 6-slider; 7-turntable; 8-turntable motor; 9-feed inlet; 10-dust cover; 11-reflux port; 12-one-way valve; 13-injector; 14-accelerating nozzle; 15-sample tray; 16-end cap; 17-fastening nut; 18-ultrasonic oscillator; 19-resistance heater; 20-bend; 21-first tee connector; 22-second tee connector. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0050] The present invention will now be described in further detail with reference to the accompanying drawings:

[0051] See Figure 1 The present invention provides an emulsion preparation device for corrosion testing of aero-engine bearings, including a sampling system and an emulsion corrosion system.

[0052] See Figure 2 The sampling system includes a base 1; two symmetrically arranged vertical guide rails 3 are connected to the base 1 by a fixture 2; a horizontal guide rail 4 that can move in the vertical direction is slidably connected between the two vertical guide rails 3; a slider 6 that can slide in the horizontal direction is installed on the horizontal guide rail 4; a sampler 5 is fixedly installed on the slider 6; a turntable 7 with several sample slots on its upper surface is provided below the horizontal guide rail 4; a turntable motor 8 that controls the rotation of the turntable and sampling is provided between the turntable 7 and the base 1.

[0053] See Figure 3 The emulsification corrosion system includes an emulsification unit, a sample introduction unit, and a multiphase flow corrosion unit;

[0054] See Figure 4 and Figure 5 The emulsification unit includes an inner cavity and an outer cavity. The inner cavity is used for the storage, mixing, and transfer of reagents. The outer cavity is filled with silicone oil and fully encloses the inner cavity. An ultrasonic oscillator 18 and a resistance heater 19 are installed in the outer cavity to achieve droplet dispersion and heating. An inlet 9 and a reflux port 11 are opened at the top of the inner cavity, and it is connected to the sample injection unit at the bottom through a bent tube 20. An air vent is also provided at the top of the inner cavity to maintain the normal air pressure in the cavity. A conductive dust cover 10 is installed on the air vent to reduce the pollution of the external environment.

[0055] See Figure 6The injection unit includes two tubing sections connected by a first tee connector 21 and a second tee connector 22 to ensure uninterrupted injection; the injection unit is connected to the multiphase flow corrosion unit via the second tee connector 22; see [link to relevant documentation]. Figure 7 Each pipeline is equipped with two one-way valves 12 to restrict the backflow of emulsion; above the pipeline between the two one-way valves 12 in each pipeline, there is a sampler 13 driven by a motor to move the piston up and down.

[0056] See Figure 8 and Figure 9 The multiphase flow corrosion unit includes an accelerating nozzle 14, a sample tray 15, an end cap 16, and a fastening nut 17. The accelerating nozzle 14 is tapered in the middle, with a large inlet and a small outlet, which can create a higher flow velocity at the tail end of the pipe. The middle part of the accelerating nozzle 14 is made of transparent material. The sample tray 15 and the end cap 16 are positioned on the accelerating nozzle 14 by studs on the tail end of the accelerating nozzle 14 and fastening nuts 17. A gasket is used to seal between the sample tray 15 and the end cap 16. The middle parts of the sample tray 15 and the end cap 16 are hollow. The middle part of the sample tray 15 is used to install the working parts, and the outlet of the end cap 16 is connected to the return port 11 through a pipe.

[0057] The working principle of the system of this invention is as follows:

[0058] In the sampling system, the turntable motor 8 drives the turntable 7 to rotate, and the sampler 5 moves above the reagent bottle to send lubricating oil and water into the emulsification corrosion system through the pipeline. In the emulsification unit, the lubricating oil is heated to the required temperature by the oil bath heating of the resistance heater 19, and the droplets are fully diffused in the oil by the ultrasonic oscillator 18 until they are stably suspended in the oil, forming small water-in-oil particles. The emulsified lubricating oil that has reached a stable state enters the injection unit through the bend pipe 20. In the injection unit, the motor controls the piston movement of the sampler 13 to draw in the emulsified lubricating oil, and then injects the emulsified lubricating oil into the accelerating nozzle 14 of the multiphase flow corrosion unit according to the set rate. The emulsified lubricating oil entering the accelerating nozzle 14 forms a stable flow velocity at the tail of the nozzle to wash the multiphase flow corrosion sample in the sample pan 15. The lubricating oil flowing over the sample surface is pushed by the pressure and enters the return port 11 through the pipeline to return to the emulsification system for re-emulsification.

[0059] This invention discloses a method for preparing an emulsion for corrosion testing of aero-engine bearings based on the above system, comprising the following steps:

[0060] Unscrew the fastening nut 17 on the end cover 16 of the multiphase flow corrosion unit, remove the sample tray 15 and install the sample piece, then close the end cover 16 and tighten the fastening nut 17.

[0061] Place the oil, adulterated liquid, and cleaning solution into the sample vial on the turntable 7, turn on the power, and initialize the position so that the turntable 7 and sampler 5 return to the designated position.

[0062] Set the ratio, quantity, and sampling order of the mixture, execute the program, and wait for sampler 5 to complete the sampling operation.

[0063] Set the ultrasonic vibration frequency, oil bath heating temperature, and initial emulsification time.

[0064] Set the flow rate and corrosion time for multiphase flow corrosion. After the emulsion has completed the set initial emulsification time, it is fed into the multiphase flow corrosion unit to start calculating the corrosion time.

[0065] After the corrosion time reaches the set time, stop the injection, unscrew the fastening nut 17 on the end cover 16 of the multiphase flow corrosion unit, remove the sample from the sample tray 15, clean and store it.

[0066] Example:

[0067] This example uses Pegasus II aviation lubricating oil and M50 bearing steel rings to illustrate a method for preparing an emulsion for corrosion testing of aero-engine bearings. The steps are as follows:

[0068] Unscrew the fastening nut 17 on the end cap 16 of the multiphase flow corrosion unit, remove the sample tray 15, place the M50 bearing steel ring into the sample tray 15, close the end cap 16 again, and tighten the fastening nut 17. Install one end of the reflux pipe at the outlet of the end cap 16, and the other end at the reflux port 11 of the emulsification chamber.

[0069] Place the Pegasus II aviation lubricating oil and a 3.5% NaCl solution into reagent bottles A and B, respectively, and the cleaning solution into reagent bottle C. Connect the output line of sampler 5 to the inlet 9 of the emulsification chamber. Turn on the power, execute the initialization program, and return the turntable 7 and sampler 5 to their designated positions.

[0070] Select the mixing ratio: Reagent A - 97.5%, Reagent B - 2.5%, Total reagent volume: 100ml, Reagent order: AB, Wait for sampling to complete.

[0071] The ultrasonic vibration frequency was set to 40kHz, the oil bath heating temperature to 50℃, and the initial emulsification time to 3 hours.

[0072] The flow rate for multiphase flow corrosion was set to 0.1 m / s, and the corrosion time to 6 hours. The emulsion was introduced into the multiphase flow corrosion unit by the injection unit 3 hours after emulsification. See [link / reference]. Figure 10 The particle distribution diagram of brine-contaminated lubricating oil emulsion after 3 hours of ultrasonic oscillation shows that the droplet diameter is basically less than 20 μm.

[0073] Nine hours later, stop the sample injection, unscrew the fastening nut 17 on the end cap 16 of the multiphase flow corrosion unit, remove the sample from the sample tray 15, clean and store it. Then, clean the equipment three times using cleaning fluid for future use. See [link to relevant documentation]. Figure 11Electron microscopy images of the surface morphology of M50 steel after 6 hours of multiphase flow corrosion show that severe corrosion behavior occurred on the sample surface.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An emulsion preparation device for corrosion testing of aero-engine bearings, characterized in that, This includes sampling systems and emulsification corrosion systems; The sampling system includes two symmetrically arranged vertical guide rails (3); a horizontal guide rail (4) that can move in the vertical direction is slidably connected between the two vertical guide rails (3); a slider (6) that can slide in the horizontal direction is installed on the horizontal guide rail (4), and a sampler (5) is fixedly installed on the slider (6); a turntable (7) is provided below the horizontal guide rail (4). The emulsification etching system includes an emulsification unit, a sample injection unit, and a multiphase flow etching unit; the emulsification unit includes an inner cavity and an outer cavity; the outer cavity encloses the inner cavity; the outer cavity is filled with silicone oil; an ultrasonic oscillator (18) and a resistance heater (19) are installed in the outer cavity; an inlet (9) and a reflux port (11) are opened at the top of the inner cavity, and it is connected to the sample injection unit at the bottom via a bend (20); the sample injection unit includes a section of pipeline equipped with two one-way valves (12); the two An injector (13) is connected above the pipeline between the one-way valves (12); the multiphase flow corrosion unit includes an accelerating nozzle (14), a sample tray (15) and an end cap (16) fixed in sequence; the sample tray (15) and the end cap (16) are hollow in the middle; the outlet of the end cap (16) is connected to the return port (11) through a pipeline; the sample tray (15) and the end cap (16) are positioned on the accelerating nozzle (14) by a stud and a fastening nut (17) on the tail end of the accelerating nozzle (14).

2. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 1, characterized in that, The sampling system also includes a base (1), which is fixedly connected to two vertical guide rails (3) by two fasteners (2).

3. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 2, characterized in that, A turntable motor (8) is provided between the base (1) and the turntable (7) to drive the turntable (7) to rotate and the sampler (5) to take samples.

4. An emulsion preparation device for corrosion testing of aero-engine bearings according to claim 1 or 3, characterized in that, Several sample slots are opened on the upper surface of the turntable (7).

5. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 1, characterized in that, An air hole is also provided above the inner cavity, and a conductive dust cover (10) is installed on the air hole.

6. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 1, characterized in that, The injection unit also includes a pipeline with two one-way valves (12); the two pipelines are connected by a first tee connector (21) and a second tee connector (22); the first tee connector (21) is connected to the bend (20), and the second tee connector (22) is connected to the acceleration nozzle (14).

7. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 6, characterized in that, The acceleration nozzle (14) is conical in the middle with a large inlet and a small outlet; the middle part of the acceleration nozzle (14) is made of transparent material.

8. The emulsion preparation equipment for corrosion testing of aero-engine bearings according to claim 1, characterized in that, The sample tray (15) and the end cap (16) are sealed with a gasket.

9. A method for preparing an emulsion using the emulsion preparation equipment for corrosion testing of aero-engine bearings as described in any one of claims 1-8, comprising the following steps: Unscrew the fastening nut (17) on the end cap (16) of the multiphase flow corrosion unit, remove the sample tray (15) and install the sample piece, then close the end cap (16) and tighten the fastening nut (17). Place the oil, adulterated liquid and cleaning solution into the sample bottle on the turntable (7), turn on the power, initialize the position so that the turntable (7) and sampler (5) return to the designated position; Set the ratio of the mixture, the total amount of reagents and the sampling order, execute the program and wait for the sampler (5) to complete the sampling operation; Set the ultrasonic vibration frequency, oil bath heating temperature, and initial emulsification time; Set the flow rate and corrosion time for multiphase flow corrosion. After the emulsion has completed the set initial emulsification time, it is fed into the multiphase flow corrosion unit to start calculating the corrosion time. After the corrosion time reaches the set time, stop the injection, unscrew the fastening nut (17) on the end cap (16) of the multiphase flow corrosion unit, remove the sample from the sample tray (15), clean and store it.

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