An automatic oil sampling device and method for an aeroengine

Abstract

The application provides an aero-engine lubricating oil automatic sampling device and method, which comprises a joint shell, a joint inserted into a lubricating oil tank drain port, an installation port of an adjustable pressure valve assembly, and an interface connected with a dirty oil path shell; an oil inlet window is arranged on the joint inserted into the lubricating oil tank drain port, and the joint inserted into the lubricating oil tank drain port is coaxial with the installation port of the adjustable pressure valve assembly; the adjustable pressure valve assembly is arranged in the installation port of the adjustable pressure valve assembly; the dirty oil path shell comprises a dirty oil path and a sampling oil path, and the dirty oil path is connected with the interface connected with the dirty oil path shell; a sampling bottle is connected with the sampling oil path; a dirty oil bottle is connected with the dirty oil path; a switching device is used for switching the lubricating oil between the dirty oil path and the sampling oil path; and the application adjusts the opening pressure of the lubricating oil tank drain port one-way valve according to the liquid level, and after a certain amount of lubricating oil is discharged, the certain amount of lubricating oil is guided to the sampling bottle.

Description

Technical Field

[0001] This application belongs to the technical field of aircraft engine lubricating oil system, and particularly relates to an automatic sampling device and method for aircraft engine lubricating oil. Background Technology

[0002] The lubricating oil in the lubrication system of aircraft engines needs to be sampled within the specified maintenance time for tests such as lubricating oil spectrum, abrasive particle size, and ferrography. In actual operation, maintenance personnel usually take samples manually from the oil tank drain port. To avoid the test results being biased by impurities deposited at the bottom of the oil tank and failing to accurately reflect the condition of the lubricating oil, technical documents usually stipulate that a certain amount of lubricating oil should be drained before sampling.

[0003] Because of manual oil draining, different operators drain different amounts of oil, which leads to inconsistencies in the oil samples taken, causing deviations in the oil sample test results and hindering trend analysis of the test results. At the same time, the inconsistent amount of oil drained affects the calculation of engine oil consumption. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic sampling device for lubricating oil in aircraft engines that can accurately control the amount of oil. The device adjusts the opening pressure of the one-way valve at the drain port according to the liquid level, releases a fixed amount of lubricating oil, and then passes a fixed amount of lubricating oil into the sampling bottle to ensure the consistency of the lubricating oil sample. At the same time, it can measure the amount of lubricating oil released, so that the engine can accurately calculate the amount of lubricating oil consumed.

[0005] In a first aspect, this application provides an automatic sampling device for lubricating oil in aircraft engines, the device comprising: The connector housing includes a connector that inserts into the oil drain port of the lubricating oil tank, an installation port for an adjustable pressure valve assembly, and an interface for connecting to the sludge oil circuit housing; wherein, the connector that inserts into the oil drain port of the lubricating oil tank is provided with an oil inlet window, and the connector that inserts into the oil drain port of the lubricating oil tank is coaxial with the installation port of the adjustable pressure valve assembly. An adjustable pressure valve assembly is provided at the mounting port of the adjustable pressure valve assembly; The sludge and oil passage housing includes a sludge and oil passage and a sampling oil passage, wherein the sludge and oil passage is connected to the interface connecting the sludge and oil passage housing; The sampling bottle is connected to the sampling oil circuit. A sludge bottle is connected to the sludge path. A switching device is used to switch the lubricating oil between the sludge oil path and the sampling oil path.

[0006] Preferably, the oily waste bottle has an upwardly extending region with an opening, and the switching device includes: A plug is disposed within the extended region, and the plug is movable within the extended region; The second pin is installed inside the sludge bottle; A connecting rod is connected to the second pin, the connecting rod is rotatable about the second pin, and one end of the connecting rod is connected to the plug; A switching valve is disposed between the sludge oil path and the sampling oil path. The switching valve is connected to the other end of the connecting rod. The switching valve is used to switch the lubricating oil between the sludge oil path and the sampling oil path.

[0007] Preferably, the switching device further includes: The second spring has one end connected to the sampling oil circuit and the other end connected to the switching valve.

[0008] Preferably, the connecting rod includes: The first sub-connecting rod, one end of which is connected to the plug; The second sub-link has one end connected to the other end of the first sub-link, and the middle part of the second sub-link is connected to the second pin; The third sub-link has one end connected to the other end of the second sub-link; wherein the first sub-link is perpendicular to the second sub-link, and the second sub-link is perpendicular to the third sub-link.

[0009] Preferably, the other end of the third sub-link is configured as a bent structure or an inclined structure.

[0010] Preferably, the adjustable pressure valve assembly includes a first rubber ring, a valve core, a first spring, a valve housing, a spring seat, a first sealing ring, a nut, a second sealing ring, a pressure adjusting rod, and a second retaining ring; The valve housing serves as a support component. After the second sealing ring is installed into the sealing ring groove of the pressure regulating rod, they are installed together into a spring seat and connected as one unit. The spring seat is installed from the end of the valve housing away from the mounting surface. By rotating the pressure regulating rod, the spring seat is screwed into the thread of the valve housing. Then, the first spring, the valve core assembly consisting of the first rubber ring vulcanized on the valve core, and the second retaining ring are installed sequentially from the end of the valve housing away from the mounting surface. The valve core assembly presses the first spring tightly onto the spring seat, and the second retaining ring blocks the valve core assembly to form an adjustable pressure valve assembly, which functions as a valve that automatically closes after releasing a certain amount of oil.

[0011] Preferably, the pressure regulating rod is marked with adjustment position lines corresponding to different liquid levels. By adjusting to the corresponding position, the valve core opening pressure at different liquid levels is controlled, thereby accurately controlling the total oil discharge volume.

[0012] Secondly, this application also provides an automatic sampling method for aircraft engine lubricating oil, the method being applied to the apparatus described above, the method comprising: Step 1: Observe the oil level in the lubricating oil tank, unscrew the nut, adjust the pressure regulating rod to the standard mark of the oil level according to the oil level, put the nut back and tighten it to ensure that the spring force of the first spring and the opening pressure of the valve core match the oil level; Step 2: Install the corresponding sludge bottle at the threaded part below the sludge oil circuit housing, and place the lubricating oil sampling bottle below the sampling oil pipe. Step 3: Remove the sealing structure at the oil drain port of the lubricating oil tank, insert the interface with the fourth sealing ring on the connector housing into the oil drain port of the lubricating oil tank, connect the automatic lubricating oil sampling device to the oil drain port of the lubricating oil tank, and start lubricating oil sampling; Step 4: Observe that after the lubricating oil enters the sludge bottle, the liquid level rises and pushes the plug upward, causing the connecting rod to move around the second pin as the axis. This makes the connecting rod overcome the tension of the second spring and pull the switching valve open, allowing the lubricating oil to enter the sampling bottle. Step 5: After the lubricating oil in the sampling bottle stops flowing, remove the sampling bottle and seal it for protection. Read the amount of lubricating oil in the sampling bottle. At the same time, determine the amount of lubricating oil in the waste oil bottle according to the selected waste oil bottle. Record the total amount of lubricating oil released in this sampling for the calculation of lubricating oil consumption.

[0013] The beneficial technical effects of this application are as follows: The device of this invention determines the valve core and closing pressure by controlling the compression of the first spring based on the liquid level adjustment lever, thus controlling the total amount of oil released during sampling. Simultaneously, a sludge bottle of a certain volume, along with a connecting rod, plug, and switching valve, ensures that lubricating oil enters the sampling bottle after the sludge bottle is full. This ensures that the total amount of oil released during each sampling is substantially consistent with the amount of oil entering the sludge bottle and sampling bottle, guaranteeing good consistency in the obtained lubricating oil samples. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0015] Figure 1 A schematic diagram of an automatic sampling device for aero-engine lubricating oil with high consistency provided by the present invention; Figure 2 This is an enlarged view of the assembly position of the switching valve of the present invention; Figure 3 This is a part drawing of the connector housing; Figure 4 Diagram of an adjustable pressure valve assembly; Wherein: 1—Connector housing; 2—Valve seat; 3—First rubber ring; 4—Valve core; 5—First spring; 6—Valve housing; 7—Spring seat; 8—First sealing ring; 9—Nut; 10—Second sealing ring; 11—Pressure adjusting rod; 12—Second spring; 13—Sampling oil pipe; 14—Third sealing ring; 15—Plug; 16—First pin; 17—First retaining ring; 18—Second pin; 19—Connecting rod; 20—Sewage bottle; 21—Sewage circuit housing; 22—Change valve; 23—Third pin; 24—Second rubber ring; 25—Second retaining ring; 26—Fourth sealing ring; 27—Change valve mounting seat; 28—Retaining ring; 29—Fourth pin. Detailed Implementation

[0016] 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, 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.

[0017] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0018] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0020] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] The following is a description of the embodiments and appendices. Figure 1 -Appendix Figure 4 The present invention will be described in further detail, but the embodiments of the present invention are not limited thereto.

[0022] To achieve high consistency in the automatic sampling device for aircraft engine lubricating oil, the present invention adopts the following technical solution: This application provides an automatic sampling device for aircraft engine lubricating oil that can accurately control the oil quantity, comprising a connector housing 1, a valve seat 2, a first rubber ring 3, a valve core 4, a first spring 5, a valve housing 6, a spring seat 7, a first sealing ring 8, a nut 9, a second sealing ring 10, a pressure adjusting rod 11, a second spring 12, a sampling oil pipe 13, a third sealing ring 14, a plug 15, a first pin 16, a first retaining ring 17, a second pin 18, a connecting rod 19, a waste oil bottle 20, a waste oil passage housing 21, a switching valve 22, a third pin 23, a second rubber ring 24, a second retaining ring 25, a fourth sealing ring 26, a switching valve mounting seat 27, a retaining ring 28, and a fourth pin 29.

[0023] The valve core 4 at the connection port achieves one-way self-sealing through the elastic force of the first spring 5, and the opening pressure of the valve core 4 can be controlled by adjusting the compression of the first spring 5 through the pressure adjusting rod 11.

[0024] The pressure regulating rod 11 is marked with adjustment position lines corresponding to different liquid levels. By adjusting to the corresponding position, the opening pressure of the valve core 4 at different liquid levels is controlled, and the total oil discharge is accurately controlled.

[0025] The pressure adjusting rod 11 and the spring seat 7 are designed with a square structure and a small interference fit, which ensures that the pressure adjusting rod can accurately adjust the axial compression of the spring through the thread.

[0026] Among them, the waste oil bottle 20 is designed in different sizes and can be replaced according to the requirements of different engines.

[0027] The switching valve 22 is designed at the intersection of the sludge oil path and the sampling oil path, and the oil sampling path is normally closed and sealed by the second spring 12.

[0028] The second rubber ring 24 is vulcanized in the sealing groove of the sampling oil passage, and works with the switching valve 22 to seal the sampling oil passage.

[0029] A hole is drilled in the middle of the connecting rod 19, through which a second pin 18 is passed to serve as a fulcrum for rotation.

[0030] The plug 15 and the connecting rod 19 are assembled at the vertical hole position of the sludge oil path housing 21, which drives the connecting rod 19 to actuate, thereby overcoming the spring force of the second spring 12 to open the switching valve 22, realizing the switching of lubricating oil in the sludge oil path and the sampling oil path.

[0031] The sludge oil path housing 21 is designed as an oil inlet and a liquid level port, and the sludge oil bottle is designed with an oil outlet to facilitate the discharge of sludge oil.

[0032] Among them, the third sealing ring 14 is vulcanized above the plug 15. The plug 15 and the vertical hole of the sludge oil passage housing 21 are fitted with a small clearance. When the plug 15 moves to contact the top of the vertical hole of the liquid level port of the sludge oil passage housing 21 under the action of oil pressure, a seal can be achieved, ensuring that the lubricating oil will enter the sampling bottle after the sludge oil bottle is full.

[0033] The beneficial effects of this invention are as follows: 1. The device of the present invention determines the total amount of oil released during sampling by controlling the compression of the first spring 5 based on the liquid level adjustment and pressure regulating rod 11, and controls the closing pressure of the valve core 4. Simultaneously, the use of a waste oil bottle 20, a connecting rod 19, a plug 15, and a switching valve 22 ensures that lubricating oil enters the sampling bottle after the waste oil bottle is full, so that the total amount of oil released during each sampling is basically consistent with the amount of oil entering the waste oil bottle and the sampling bottle, thus ensuring good consistency of the obtained lubricating oil samples.

[0034] 2. Using this invention for lubricating oil sampling and analysis results in good consistency of the lubricating oil samples, avoiding the influence of factors such as inconsistent sampling by different operators and differences in sampling by the same operator each time when sampling manually. The data is more accurate and can improve the accuracy of trend analysis of various indicators of oil sample measurement data.

[0035] 3. Using this invention, the compression of the first spring 5 is controlled by adjusting the pressure regulating rod 11 according to the liquid level to determine the total amount of oil released during sampling and the closing pressure control. At the same time, all the lubricating oil in the sampling process is collected into the container through the waste oil bottle and the sampling bottle, which can accurately measure the amount of lubricating oil released during the sampling process and improve the calculation accuracy of lubricating oil consumption.

[0036] 4. Compared with the manual method of draining oil and then sampling, this invention uses the fourth sealing ring 26 for sealing, the first spring 5, the first rubber ring and the valve core 4 for self-sealing, and simultaneously uses the waste oil bottle and the sampling bottle to collect all the lubricating oil into the container, without any lubricating oil leakage. This can avoid the situation where lubricating oil contaminates other parts of the engine or splashes onto maintenance personnel when draining oil. The oil draining and sampling are automatically switched without interruption, shortening the field maintenance time and improving efficiency.

[0037] In other embodiments of this application, an oil filter cover structure that facilitates the installation and removal of an oil filter with a large radial sealing compression capacity is provided, including a connector housing 1, a valve seat 2, a first rubber ring 3, a valve core 4, a first spring 5, a valve housing 6, a spring seat 7, a first sealing ring 8, a nut 9, a second sealing ring 10, a pressure adjusting rod 11, a second spring 12, a sampling oil pipe 13, a third sealing ring 14, a plug 15, a first pin 16, a first retaining ring 17, a second pin 18, a connecting rod 19, a sludge bottle 20, a sludge oil passage housing 21, a conversion valve 22, a third pin 23, a second rubber ring 24, a second retaining ring 25, a third sealing ring 26, a conversion valve mounting seat 27, a retaining ring 28, and a fourth pin 29.

[0038] The connector housing 1 is the main supporting structure of the device, comprising four interfaces. The first is a connector that inserts into the oil drain port of the lubricating oil tank. The front section of the connector has oil inlet windows evenly distributed along the circumference. Behind the oil inlet windows, a radial sealing ring mounting groove for mating with the oil drain port is machined on the outer diameter of the connector. The second connector, on the same axis as the connector inserted into the oil inlet port, is the mounting port for the adjustable valve assembly. From the valve mounting port side, the inner holes sequentially form a stepped hole for mounting the valve housing, a valve housing outlet mating hole, and a valve seat mounting hole. The stepped hole for mounting the valve housing is designed with a clearance fit at the small diameter, while the large diameter is determined by calculating the rubber ring compression. The outer diameter of the stepped hole is larger than the diameter at the farthest point, and the inner diameter of the valve housing outlet mating hole is larger than the outer diameter of the outlet, allowing lubricating oil to flow smoothly out of the valve. The valve seat mounting hole is designed with an interference fit with the outer diameter of the valve seat. An oil passage for flowing lubricating oil is machined at the oil outlet mating hole of the valve housing in a direction perpendicular to the installation axis of the adjustable valve. The inner hole of the oil passage is coaxially connected to the third interface, which connects to the oil passage of the sludge oil passage housing. Along the axial direction, there are, in sequence, a shoulder that mates with the changeover valve and an internal thread that connects to the sludge oil passage housing. A sampling oil passage is machined obliquely downward on the sludge oil passage housing. The sampling oil passage, axially from the inside to the outside, consists of, in sequence, a shoulder that mates with the changeover valve and an external thread that connects to the sampling oil passage.

[0039] The valve seat 2 is a cylindrical structure with two sections of different diameters along the axis, with a through hole machined in the middle. The cylindrical surface with a larger diameter is inserted into the connector housing for interference fit and fixation, while the cylindrical end face with a smaller diameter fits with the rubber ring on the valve core to achieve a seal.

[0040] The first rubber ring 3, valve core 4, first spring 5, valve housing 6, spring seat 7, first sealing ring 8, nut 9, second sealing ring 10, pressure adjusting rod 11, and second retaining ring 25 together constitute an adjustable pressure valve assembly. Figure 4 The valve housing 6 serves as the main support component. After the second sealing ring 10 is installed into the sealing ring groove of the pressure adjusting rod 11, they are together installed into the spring seat 7 and connected as a whole. It is installed from the end of the valve housing 6 away from the mounting surface. The spring seat 7 is screwed into the thread of the valve housing 6 by rotating the pressure adjusting rod. Subsequently, the first spring 5, the valve core assembly formed by the first rubber ring 3 vulcanized on the valve core 4, and the second retaining ring 25 are installed sequentially from the end of the valve housing 6 away from the mounting surface. The valve core assembly presses the first spring 5 tightly onto the spring seat 7, and the second retaining ring 25 blocks the valve core assembly to form an adjustable pressure valve assembly, which functions as a valve that automatically closes after releasing a certain amount of oil.

[0041] The first rubber ring 3 is an annular structure with a trapezoidal cross-section and a central hole, which is vulcanized on the valve core 4 to form a valve core assembly.

[0042] The valve core 4 is a cylindrical structure with two sections of different diameters in the axial direction. The end face of the larger diameter end is machined with a vulcanized rubber ring groove, and its outer diameter matches the inner diameter of the valve housing 6. The transition step surface of the two diameters fits with the end face of the first spring 5. The outer diameter of the smaller diameter end matches the inner diameter of the spring. Some material is removed from the center to reduce weight.

[0043] The second retaining ring 25 is an annular retaining ring with a circular cross-section opening. After the opening is pressed, it is installed on the housing mounting base at the farthest end from the valve housing mounting surface.

[0044] The changeover valve 22 is connected to the changeover valve mounting base 27 via the fourth pin 29 to form a changeover valve assembly. Figure 2 The switching valve 22 and the fourth pin 29 are clearance-fitted, allowing the switching valve 22 to rotate around the fourth pin 29 as its axis. The switching valve mounting base 27 and the fourth pin 29 are interference-fitted, used to fix the relative positions of the switching valve 22 and the switching valve mounting base 27. After the switching valve assembly is assembled, the switching valve 22 is connected to the connecting rod 19 by the third pin 23. The third pin 23 and the mounting hole on the switching valve assembly are interference-fitted, fixing the relative positions of the switching valve 22 and the connecting rod 19; the third pin 23 and the connecting rod 19 are clearance-fitted, allowing the connecting rod 19 to rotate around the third pin 23 as its axis. After the switching valve assembly and the connecting rod are assembled as a whole, they are installed into the connector housing 1 and fixed by two retaining rings 28, realizing the flow of lubricating oil between the sludge oil path and the sampling oil path. Figure 2 The function of switching between ( ).

[0045] In use, loosen nut 9 according to the oil tank level, adjust pressure regulating rod 11 to the corresponding position, insert the connector housing into the oil tank drain port, and the self-sealing valve inside the drain port is opened by the connector end face, allowing the lubricating oil in the tank to flow in through the inlet. The fourth sealing ring 26 on the connector cooperates with the oil tank drain port to achieve a seal, preventing lubricating oil from leaking to the outside. The inflowing lubricating oil pressure overcomes the force of the first spring 5 to open the valve core 4 and enters through the flow channels of the connector housing 1 and the sludge oil passage housing 21, entering the sludge oil bottle 20. As the liquid level rises to the required oil volume, the lubricating oil pressure pushes the plug 15 upward and drives the connecting rod 19 to move around the second pin 18 as the axis, so that the connecting rod 19 overcomes the tension of the second spring 12 to pull the switching valve 22. After the valve opens to a certain degree, it is fully opened under the action of the connecting rod and the lubricating oil, and the lubricating oil enters the sampling bottle through the sampling oil pipe 13. When the lubricating oil level drops by a certain amount, the oil pressure in the oil tank decreases. The first spring 5 overcomes the oil pressure and presses the valve core into contact with the valve seat 2. The valve seat and the first rubber ring 3 achieve a tight seal to cut off the lubricating oil.

[0046] By designing an automatic lubricating oil sampling structure according to the above method, the consistency of lubricating oil samples can be ensured; at the same time, the amount of lubricating oil discharged can be measured, enabling the engine to accurately calculate the amount of lubricating oil consumed.

[0047] In other embodiments of this application, an automatic sampling method for aircraft engine lubricating oil is provided, comprising the following steps: Step 1: Observe the oil level in the lubricating oil tank, unscrew nut 9, adjust pressure regulating rod 11 to the standard mark of the oil level according to the oil level, reinstall nut 9 and tighten it to ensure that the elastic force of the first spring 5 and the opening pressure of the valve core 4 match the oil level.

[0048] Step 2: Install the corresponding sludge bottle 20 at the threaded part below the sludge oil circuit housing 21, and place the lubricating oil sampling bottle below the sampling oil pipe.

[0049] Step 3: Remove the sealing structure at the oil drain port of the lubricating oil tank, insert the interface of the connector housing 1 with the fourth sealing ring 26 into the oil drain port of the lubricating oil tank, connect the automatic lubricating oil sampling device to the oil drain port of the lubricating oil tank, and start lubricating oil sampling.

[0050] Step 4: After the lubricating oil enters the sludge bottle, the liquid level rises and pushes the plug 15 upward, causing the connecting rod 19 to move around the second pin 18 as the axis. This causes the connecting rod 19 to overcome the pulling force of the second spring 12 and pull the switching valve 22 to open, allowing the lubricating oil to enter the sampling bottle.

[0051] Step 5: After the lubricating oil in the sampling bottle stops flowing, remove the sampling bottle and seal it for protection. Read the amount of lubricating oil in the sampling bottle. At the same time, determine the amount of lubricating oil in the waste oil bottle according to the selected waste oil bottle. Record the total amount of lubricating oil released in this sampling for the calculation of lubricating oil consumption.

[0052] Step 6: Pull the automatic oil sampling device out of the oil tank drain port, drain the dirty oil from the dirty oil bottle, and then place the automatic oil sampling device in the designated position for later use.

[0053] Step 7: Reassemble the sealing structure at the oil drain port of the lubricating oil tank to complete the lubricating oil sampling.

[0054] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. An automatic sampling device for lubricating oil in aircraft engines, characterized in that, The device includes: The connector housing includes a connector that inserts into the oil drain port of the lubricating oil tank, an installation port for an adjustable pressure valve assembly, and an interface for connecting to the sludge oil circuit housing; wherein, the connector that inserts into the oil drain port of the lubricating oil tank is provided with an oil inlet window, and the connector that inserts into the oil drain port of the lubricating oil tank is coaxial with the installation port of the adjustable pressure valve assembly. An adjustable pressure valve assembly is provided at the mounting port of the adjustable pressure valve assembly; The sludge and oil passage housing includes a sludge and oil passage and a sampling oil passage, wherein the sludge and oil passage is connected to the interface connecting the sludge and oil passage housing; The sampling bottle is connected to the sampling oil circuit. A sludge bottle is connected to the sludge path. A switching device is used to switch the lubricating oil between the sludge oil path and the sampling oil path.

2. The apparatus according to claim 1, characterized in that, The sludge bottle has an upwardly extending region with an opening, and the switching device includes: A plug is disposed within the extended region, and the plug is movable within the extended region; The second pin is installed inside the sludge bottle; A connecting rod is connected to the second pin, the connecting rod is rotatable about the second pin, and one end of the connecting rod is connected to the plug; A switching valve is disposed between the sludge oil path and the sampling oil path. The switching valve is connected to the other end of the connecting rod. The switching valve is used to switch the lubricating oil between the sludge oil path and the sampling oil path.

3. The apparatus according to claim 2, characterized in that, The switching device further includes: The second spring has one end connected to the sampling oil circuit and the other end connected to the switching valve.

4. The apparatus according to claim 3, characterized in that, The link includes: The first sub-connecting rod, one end of which is connected to the plug; The second sub-link has one end connected to the other end of the first sub-link, and the middle part of the second sub-link is connected to the second pin; The third sub-link has one end connected to the other end of the second sub-link; wherein the first sub-link is perpendicular to the second sub-link, and the second sub-link is perpendicular to the third sub-link.

5. The apparatus according to claim 4, characterized in that, The other end of the third sub-link is configured as a bent structure or an inclined structure.

6. The apparatus according to claim 5, characterized in that, The adjustable pressure valve assembly includes a first rubber ring, a valve core, a first spring, a valve housing, a spring seat, a first sealing ring, a nut, a second sealing ring, a pressure adjusting rod, and a second retaining ring. The valve housing serves as a support component. After the second sealing ring is installed into the sealing ring groove of the pressure regulating rod, they are installed together into a spring seat and connected as one unit. The spring seat is installed from the end of the valve housing away from the mounting surface. By rotating the pressure regulating rod, the spring seat is screwed into the thread of the valve housing. Then, the first spring, the valve core assembly consisting of the first rubber ring vulcanized on the valve core, and the second retaining ring are installed sequentially from the end of the valve housing away from the mounting surface. The valve core assembly presses the first spring tightly onto the spring seat, and the second retaining ring blocks the valve core assembly to form an adjustable pressure valve assembly, which functions as a valve that automatically closes after releasing a certain amount of oil.

7. The apparatus according to claim 6, characterized in that, The pressure regulating rod is marked with adjustment position lines corresponding to different liquid levels. By adjusting to the corresponding position, the valve core opening pressure at different liquid levels can be controlled, thereby accurately controlling the total oil discharge volume.

8. An automatic sampling method for lubricating oil in an aircraft engine, characterized in that, The method is applied to the apparatus of claim 7, the method comprising: Step 1: Observe the oil level in the lubricating oil tank, unscrew the nut, adjust the pressure regulating rod to the standard mark of the oil level according to the oil level, put the nut back and tighten it to ensure that the spring force of the first spring and the opening pressure of the valve core match the oil level; Step 2: Install the corresponding sludge bottle at the threaded part below the sludge oil circuit housing, and place the lubricating oil sampling bottle below the sampling oil pipe. Step 3: Remove the sealing structure at the oil drain port of the lubricating oil tank, insert the interface with the fourth sealing ring on the connector housing into the oil drain port of the lubricating oil tank, connect the automatic lubricating oil sampling device to the oil drain port of the lubricating oil tank, and start lubricating oil sampling; Step 4: Observe that after the lubricating oil enters the sludge bottle, the liquid level rises and pushes the plug upward, causing the connecting rod to move around the second pin as the axis. This makes the connecting rod overcome the tension of the second spring and pull the switching valve open, allowing the lubricating oil to enter the sampling bottle. Step 5: After the lubricating oil in the sampling bottle stops flowing, remove the sampling bottle and seal it for protection. Read the amount of lubricating oil in the sampling bottle. At the same time, determine the amount of lubricating oil in the waste oil bottle according to the selected waste oil bottle. Record the total amount of lubricating oil released in this sampling for the calculation of lubricating oil consumption.

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