In-line aircraft fuel tank contamination deposition alert device and method of use

Abstract

This invention discloses an embedded aircraft fuel tank fuel impurity deposition alarm device and its usage method, belonging to the field of fuel tank detection technology. It includes a fuel tank; a fuel inlet and a mounting sleeve are arranged side-by-side on the top of the fuel tank, with the lower part of the fuel inlet and the lower part of the mounting sleeve connected by a maintenance component; a sealing component is connected above the mounting sleeve, and an alarm component is installed on the sealing component; a trigger component is connected to the lower end of the alarm component, penetrating the sealing component; the maintenance component is used to filter impurities in the fuel, the sealing component is used to seal the maintenance component, and the trigger component is used to trigger the alarm component through air pressure and fuel buoyancy when there are too many deposited impurities after filtration by the maintenance component. This invention uses the maintenance component, sealing component, trigger component, and alarm component in combination, eliminating the need for sampling inspection. By filtering impurities through the maintenance component and triggering the alarm, the impurity status of the fuel can be determined, eliminating the need for fuel sampling. Inspection can be completed with each refueling, thereby improving detection efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fuel tank detection technology, specifically relating to an embedded aircraft fuel tank fuel impurity deposition alarm device and its usage method. Background Technology

[0002] During fuel transportation and production, fuel can be contaminated by the tanks containing it and the pipelines used for transportation. When the tanks are not full, moisture exists in the air inside. As the temperature of the tank changes with the external environment, the moisture in the air condenses on the inner wall of the tank, forming water droplets. When the fuel is stored for a long time, the water droplets affect the inner wall of the tank, resulting in corrosion and rust, thus contaminating the fuel. Fuel impurity detection devices are usually used to test fuel samples using specialized equipment (optical detection, gravimetric detection, etc.) after sampling, or to observe the fuel sample through a sampling device to determine the condition of the fuel in the tank.

[0003] Both of the above methods require oil sampling, which is a complex and inefficient process. Furthermore, cleaning and maintenance are inconvenient after particulate impurities are detected. Therefore, we propose an embedded aircraft fuel tank oil impurity deposition alarm device and detection method.

[0004] Among existing oil tank impurity detection devices, Chinese invention patent: An aircraft fuel tank oil level control system, authorized announcement number: CN106774476A discloses: a first fluid level detection device, installed inside the fuel tank, used to control the refueling switch to stop refueling when the fuel level inside the fuel tank is detected to reach a first predetermined height; and a second fluid level detection device, installed inside the fuel tank, used to control the refueling switch to stop refueling when the fuel level inside the fuel tank is detected to reach a second predetermined height, wherein the second predetermined height is greater than the first predetermined height.

[0005] The aforementioned existing technology has the following problems: 1. Using existing technologies for fuel impurity detection does not allow for the identification of impurities in fuel without sampling, thus reducing the efficiency of impurity detection.

[0006] 2. Using existing technologies for fuel impurity detection requires extracting the fuel and then setting up an additional detection device to detect the fuel impurities. Summary of the Invention

[0007] The purpose of this invention is to overcome the aforementioned problems and propose an embedded aircraft fuel tank oil impurity deposition alarm device, which solves the problem that the existing technology cannot determine the impurities in the aircraft fuel tank oil without sampling the fuel, thus reducing the efficiency of impurity detection.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An embedded aircraft fuel tank fuel impurity deposition alarm device is characterized by comprising a fuel tank, a maintenance component, a sealing component, a triggering component, and an alarm component. A fuel inlet and a mounting sleeve are arranged side-by-side on the top of the fuel tank. The maintenance component includes a U-shaped tube and a flexible cylinder fitted inside the U-shaped tube. The lower part of the fuel inlet and the lower part of the mounting sleeve are connected by the U-shaped tube, and an oil outlet groove is provided at the bottom of the U-shaped tube. A connecting device for connecting to the triggering component is fixedly installed at the opening of the flexible cylinder on the side of the mounting sleeve. A gap is provided on the flexible cylinder for filtering impurities in the fuel. A conical sleeve is fixedly fitted inside the flexible cylinder, and a conical tube is fixedly connected to the conical part of the conical sleeve for intercepting impurities in the fuel. A sealing component is connected above the mounting sleeve. An alarm component is installed on the sealing component, and the lower end of the alarm component contacts the triggering component that penetrates the sealing component. The triggering component is used to activate the alarm component when impurities are deposited after the flexible cylinder filters the fuel, causing an increase in air pressure inside the flexible cylinder and fuel buoyancy, which pushes the triggering component.

[0009] The connecting device is equipped with a pull ring connection trigger component in the middle.

[0010] The sealing assembly includes a cap and a threaded sleeve. The bottom of the cap is integrally connected to the threaded sleeve, which is connected to an installation sleeve for sealing the installation sleeve. The threaded sleeve has a movable cavity inside, and a funnel-shaped separator membrane is fixedly connected to the inner wall of the movable cavity. The funnel-shaped separator membrane has its small opening facing downwards and is used to isolate the inside of the tank from the external environment. A protruding post is fixedly connected to the bottom of the threaded sleeve, and an annular claw is fixedly connected to the bottom of the protruding post. The annular claw is connected to a pull ring for connecting the flexible cylinder and the cap. The triggering assembly includes a float and a push rod. The bottom of the push rod is threadedly connected to the top of the float, and the top of the push rod extends upwards from the annular claw through the cap. A top plate is connected to the top of the push rod, and the top plate contacts the cap. A retaining ring is sleeved on the push rod for supporting the float.

[0011] The alarm assembly includes a fixed rod, a bell, and a crossbar. One end of the crossbar is fixedly connected to the top of the fixed rod, and a bell hammer is located below the other end of the crossbar. A spring is installed on the crossbar portion above the bell hammer. The bell is sleeved on the top of the fixed rod, and the crossbar is positioned above the bell. The bell hammer is positioned above the top plate and below the bell. The bell hammer is triggered by the top plate, and the bell is triggered to ring by the spring on the bell hammer contacting the crossbar for reset.

[0012] The cone sleeve is provided in 4 sets to ensure unidirectional fuel flow.

[0013] The diameter of the fixing ring is larger than the diameter of the small opening of the funnel-shaped separator membrane.

[0014] The ring-shaped claw is an elastic ring-shaped claw.

[0015] The opening tube is oriented towards the mounting sleeve.

[0016] The method of using the embedded aircraft fuel tank oil impurity deposition alarm device is characterized by the following specific steps: Step s1: Refueling is performed through the fuel filler port. After the fuel enters the flexible cylinder, the gaps on the flexible cylinder filter the fuel, and the fuel enters the fuel tank through the fuel outlet groove at the bottom of the U-shaped tube. Step s2: As the soft tube filters impurities, the impurity particles accumulate in the soft tube, causing the liquid level near the float in the U-shaped tube to gradually rise. This causes the float to rise due to buoyancy, and the air in the cavity formed between the liquid level and the separator membrane is compressed and pushes the separator membrane upward. Step s3: Under the combined action of the upward push of the separator membrane and buoyancy, the top plate and the top rod move upward. After the top plate contacts the hammer handle, the hammer handle deflects. When the hammer handle deflects to the limit, the spring releases potential energy and resets the hammer head and hammer handle. The hammer head strikes the bell and makes a sound, prompting personnel to clean or replace the soft cylinder. Step s4: Remove the threaded sleeve and soft cylinder, and use the tapered sleeve and the conical tube to carry out the particulate impurities in the soft cylinder, while preventing the particulate impurities from scattering out. Step s5: After the soft tube is completely removed, release the clamping state by using the chucks to separate the soft tube from the threaded sleeve. Then the soft tube can be cleaned or replaced.

[0017] In step s4, as the horizontally placed conical sleeve is pulled out of the mounting sleeve, it gradually becomes vertical. When excessive particulate impurities overflow from the tube, the originally inverted conical sleeve and tube are horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve and tube, preventing the particulate impurities from falling through the tail of the soft tube.

[0018] The advantages of using this invention are: I. Compared with the prior art, the present invention uses a maintenance component, a sealing component, a triggering component and an alarm component in combination. It does not require sampling and testing. The maintenance component filters impurities and triggers an alarm, which can determine the impurity status of the fuel. There is no need to sample the fuel. The alarm can be triggered after multiple refuelings, thereby improving the detection efficiency.

[0019] Second, compared with the prior art, the present invention integrates the functions of the maintenance component, sealing component, triggering component and alarm component, and sets them inside the oil tank to achieve a complete set of filtration and alarm effects, thereby improving detection efficiency.

[0020] Third, this invention uses a conical sleeve and a conical tube to carry out particulate impurities from the flexible cylinder. As the horizontally placed conical sleeve is pulled out of the mounting sleeve, it gradually becomes vertical. When too many particulate impurities overflow from the conical tube, the originally inverted conical sleeve and conical tube are now horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve and conical tube, thereby preventing particulate impurities from falling through the tail of the flexible cylinder. This solves the problem of inconvenience in cleaning and maintenance after particulate impurities are detected.

[0021] IV. The separator membrane of this invention is used to isolate the external environment from the internal environment of the fuel tank to prevent fuel evaporation and leakage, thereby improving system reliability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the fuel tank of the present invention; Figure 2 This is a schematic diagram of the fuel tank structure of the present invention; Figure 3 This is a schematic diagram of the alarm component structure of the present invention; Figure 4 This is a schematic diagram of the sealing assembly structure of the present invention; Figure 5 This is a schematic diagram of the trigger component structure of the present invention; Figure 6 This is a schematic diagram of the flexible tube structure of the present invention; Figure 7 This is a schematic diagram of the U-shaped tube structure of the present invention; Figure 8 This is a top view of the fuel tank of the present invention; Figure 9 This is a cross-sectional view of the fuel tank of the present invention (AA section). Figure 10 This is an enlarged view of the alarm device of the present invention.

[0023] Reference numerals: 1. Oil tank, 2. Oil inlet, 3. Mounting sleeve, 4. Maintenance component, 5. Sealing component, 6. Alarm component, 7. Trigger component, 8. U-tube, 9. Oil outlet groove, 10. Flexible cylinder, 11. Connecting device, 12. Pull ring, 13. Conical sleeve, 14. Bundle tube, 15. Cover, 16. Threaded sleeve, 17. Movable cavity, 18. Funnel-shaped separator membrane, 19. Protruding column, 20. Annular claw, 21. Float, 22. Top rod, 23. Top plate, 24. Fixing ring, 25. Fixing rod, 26. Bell, 27. Crossbar, 28. Bell hammer, 29. Spring. Detailed Implementation

[0024] Example 1 An embedded aircraft fuel tank 1 fuel impurity deposition alarm device includes a fuel tank 1, a maintenance component 4, a sealing component 5, a triggering component 7, and an alarm component 6. The top of the fuel tank 1 has a fuel inlet 2 and a mounting sleeve 3 arranged side-by-side. The maintenance component 4 includes a U-shaped tube 8 and a flexible cylinder 10 sleeved within the U-shaped tube 8. The lower part of the fuel inlet 2 and the lower part of the mounting sleeve 3 are connected via the U-shaped tube 8, and the bottom of the U-shaped tube 8 has an oil outlet groove 9. The flexible cylinder 10 has a connecting device 11 fixedly installed at its opening on the side of the mounting sleeve 3, which connects to the triggering component 7. The cylinder 10 has a gap for filtering impurities in the fuel. A conical sleeve 13 is fixedly fitted inside the flexible cylinder 10, and a conical tube 14 is fixedly connected to the conical part of the conical sleeve 13 for intercepting impurities in the fuel. A sealing assembly 5 is connected above the mounting sleeve 3. An alarm assembly 6 is provided on the sealing assembly 5, and the lower end of the alarm assembly 6 contacts the trigger assembly 7 that penetrates the sealing assembly 5. The trigger assembly 7 is used to trigger the alarm assembly 6 when impurities are deposited after the flexible cylinder 10 filters the fuel, causing an increase in air pressure inside the flexible cylinder 10 and fuel buoyancy.

[0025] The connecting device 11 is provided with a pull ring 12 in the middle to connect to the trigger component 7.

[0026] The sealing assembly 5 includes a cover 15 and a threaded sleeve 16. The bottom of the cover 15 is integrally connected to the threaded sleeve 16. The threaded sleeve 16 is connected to the mounting sleeve 3 to seal the mounting sleeve 3. The threaded sleeve 16 has a movable cavity 17 inside. A funnel-shaped separator 18 is fixedly connected to the inner wall of the movable cavity 17. The funnel-shaped separator 18 has a small opening facing downwards. The separator is used to isolate the inside of the oil tank 1 from the external environment. A protrusion 19 is fixedly connected to the bottom of the threaded sleeve 16. An annular claw 20 is fixedly connected to the bottom of the protrusion 19. The annular claw 20 is connected to the pull ring 12 to connect the flexible cylinder 10 and the cover 15. The triggering assembly 7 includes a float 21 and a push rod 22. The bottom of the push rod 22 is threadedly connected to the top of the float 21. The top of the push rod 22 extends upwards from the annular claw 20 and passes through the cover 15. A top plate 23 is connected to the top of the push rod 22. The top plate 23 contacts the cover 15. A fixing ring 24 is sleeved on the push rod 22 to support the float 21.

[0027] The alarm assembly 6 includes a fixed rod 25, a bell 26, and a crossbar 27. One end of the crossbar 27 is fixedly connected to the top of the fixed rod 25, and a bell hammer 28 is provided below the other end of the crossbar 27. A spring 29 is provided on the part of the crossbar 27 above the bell hammer 28. The bell 26 is sleeved on the top of the fixed rod 25, and the crossbar 27 is positioned above the bell 26. The bell hammer 28 is positioned above the top plate 23 and below the bell 26. The bell 26 is triggered by the bell hammer 28 triggered by the top plate 23, and the crossbar 27 is reset by the spring 29 on the bell hammer 28 contacting it.

[0028] The cone sleeve 13 is provided in 4 sets to ensure unidirectional fuel flow.

[0029] The diameter of the fixing ring 24 is larger than the diameter of the small opening of the funnel-shaped separator membrane 18.

[0030] The ring-shaped claw 20 is an elastic ring-shaped claw 20.

[0031] The constriction tube 14 is oriented toward the mounting sleeve 3.

[0032] The technical solutions in the embodiments of the present invention will be further described with reference to the accompanying drawings. Maintenance component 4 includes a U-shaped tube 8, one end of which is fixedly connected to an oil inlet 2. A flexible sleeve 10 for filtering fuel is movably sleeved on the inner wall of the U-shaped tube 8. One end of the flexible sleeve 10 is fixedly connected to a connector. A pull ring 12 is fixedly connected to one side of the multiple connectors that are close to each other. A conical sleeve 13 is fixedly sleeved inside the flexible sleeve 10. The conical part of the conical sleeve 13 is fixedly connected to a constriction tube 14. An oil outlet groove 9 is opened at the bottom of the U-shaped tube 8.

[0033] The sealing assembly 5 includes a cover 15, with a threaded sleeve 16 fixedly connected to the bottom of the cover 15. The threaded sleeve 16 has an internal movable cavity 17, and a separator membrane is fixedly connected to the annular inner wall of the movable cavity 17. The separator membrane effectively isolates the internal and external environments of the fuel tank 1, preventing fuel evaporation and leakage. Simultaneously, the air compression cavity formed between the fuel level and the separator membrane, under the pressure of the liquid in the U-shaped tube 8 at the other end, pushes the separator membrane upwards with air, thus combining with the pressure on the float 21 from the fuel level. The buoyancy of the top plate 23 pushes the top rod 22 upward, so that the top plate 23 effectively acts on the hammer handle. The bottom of the threaded sleeve 16 is fixedly connected to the protrusion 19, and the bottom of the protrusion 19 is fixedly connected to multiple ring-shaped claws. Through the elastic deformation of the claws, a locking action is formed when the pull ring 12 is installed, which facilitates the installation and disassembly of the soft cylinder 10, makes it easier to clean the particles inside the soft cylinder 10, and helps to improve maintenance efficiency. The top side of the oil tank 1 is fixedly connected to the mounting sleeve 3, and the mounting sleeve 3 is threadedly connected to the threaded sleeve 16. Trigger assembly 74 includes a float 21, a top rod 22 is threadedly connected to the top of the float 21, a fixing ring 24 is fixedly sleeved on the side surface of the top rod 22 and the side surface of the fixing ring 24 is fixedly sleeved with the inner ring surface of the separator membrane, one end of the top rod 22 passes through the cover 15 and is movably connected, and a top piece 23 is fixedly connected to the top of the top rod 22. Alarm component 6 includes a fixed rod 25, a bell 26 fixedly sleeved on the side surface of the fixed rod 25, a crossbar 27 fixedly connected to the top of the fixed rod 25, a spring 29 fixedly connected to one side of the bottom of the crossbar 27, a hammer handle fixedly connected to the other end of the spring 29, and a hammer head fixedly connected to the other end of the hammer handle.

[0034] In this embodiment, asFigure 2 , Figure 3 and Figure 10 As shown, the other end of the U-shaped tube 8 is fixedly connected to the bottom of the mounting sleeve 3. Both the fuel inlet 2 and the mounting sleeve 3 are fixedly fitted onto the groove at the top of the fuel tank 1. The pull ring 12 is engaged by elastic deformation formed by the claws, and the pull ring 12 is movably fitted onto the side surface of the protrusion 19. Multiple conical sleeves 13 and constricted tubes 14 are distributed along the path of the flexible cylinder 10. The flared end of the conical sleeve 13 is close to the fuel inlet 2. The push rod 22 pushes upwards, causing the fuel level to rise and providing upward pressure to the float 21. Buoyancy is achieved by the descent of the top rod 22 through the weight of the float 21 and the top rod 22 itself. The separator is made of an elastically deformable material, and its shape changes with the rise and fall of the top rod 22. It is placed inside the U-shaped tube 8 by the soft tube 10, and multiple conical sleeves 13 and the constricted tube 14 are used to block impurity particles. After the soft tube 10 is removed, the solid particle impurities in the soft tube 10 can be removed through the conical sleeves 13 and the constricted tube 14, preventing them from falling into the oil tank 1. This filters the fixed particle impurities and makes them easy to remove.

[0035] In this embodiment, as Figure 2 , Figure 3 and Figure 10 As shown, a sealing ring for sealing is provided between the top of the mounting sleeve 3 and the cover 15. The separator membrane is used to isolate the external environment from the internal environment of the fuel tank 1. The bottom side of the hammer handle is deflected by the push of the top plate 23 and the push rod 22. The spring 29 is used to reset the deflected hammer handle. The potential energy released by the spring 29 is used to strike the bell 26 to make a sound. When too many particulate impurities accumulate in the soft cylinder 10, the flow of fuel through the gaps in the soft cylinder 10 is reduced due to the blockage of the gaps during the refueling process through the fuel inlet 2. This causes the fuel level to rise, which in turn causes the float 21 to move upward and the hammer head and hammer handle of the bell hammer 28 to deflect. When the hammer handle of the bell hammer 28 separates from the top plate 23, the hammer head and hammer handle are reset under the action of the spring 29, so that the hammer head strikes the bell 26 to remind the personnel to stop refueling and that the soft cylinder 10 needs to be cleaned. In this way, the fuel is filtered during the refueling process, and the self-inspection of the soft cylinder 10 due to impurity blockage is completed at the same time.

[0036] Refueling is performed through the filler port 2. After the fuel enters the flexible cylinder 10, it is filtered through the gaps in the flexible cylinder 10. The fuel then enters the fuel tank 11 through the outlet groove 9 at the bottom of the U-shaped tube 8.

[0037] During refueling, particulate matter is filtered out by the flexible cylinder 10 and remains inside the flexible cylinder 10. With prolonged use, particulate impurities accumulate in the flexible cylinder 10, reducing the filtration efficiency. As a result, during refueling, the liquid level in the U-shaped tube 8 near the float 21 gradually rises under the action of liquid pressure. At the same time, the air in the cavity formed between the liquid level and the separator membrane is compressed and pushes the separator membrane upward. As the liquid level rises, the float 21 is lifted by buoyancy.

[0038] Under the combined action of the upward push of the separator membrane and buoyancy, the top plate 23 and the top rod 22 move upward. When the top plate 23 contacts the hammer handle, the hammer handle deflects because the direction of the force exerted by the top plate 23 on the hammer handle is not in a straight line with the longitudinal direction of the spring 29. When the hammer handle deflects to its limit, the spring 29 releases potential energy and resets the hammer head and hammer handle. The hammer head strikes the bell 26 to make a sound, which is used to remind people.

[0039] Personnel remove the threaded sleeve 16 and the flexible cylinder 10 through the threaded sleeve 16. Since the conical sleeve 13 and the constricted tube 14 form a cone shape, when the flexible cylinder 10 is removed from the mounting sleeve 3, the conical sleeve 13 and the constricted tube 14 carry out the particulate impurities in the flexible cylinder 10 and prevent the particulate impurities from scattering out. When the horizontally placed conical sleeve 13 is pulled out from the mounting sleeve 3, it gradually becomes vertical. When too many particulate impurities overflow from the constricted tube 14, the originally inverted conical sleeve 13 and the constricted tube 14 are horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve 13 and the constricted tube 14, thereby preventing the particulate impurities from falling out through the tail of the flexible cylinder 10. After the soft tube 10 is completely removed, the locking state is released by the chuck, so that the soft tube 10 is separated from the threaded sleeve 16, and then the soft tube 10 can be cleaned or replaced.

[0040] The method of use and advantages of this invention: The embedded aircraft fuel tank oil impurity alarm device operates as follows: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, during use, refueling is performed through the fuel inlet 2. After the fuel enters the flexible cylinder 10, it is filtered through the gaps in the flexible cylinder 10. The fuel then enters the fuel tank 11 through the fuel outlet 9 at the bottom of the U-shaped tube 8. During the refueling process, particulate matter is filtered out by the flexible cylinder 10 and remains inside the flexible cylinder 10. With prolonged use, particulate impurities accumulate in the flexible cylinder 10, reducing the filtration efficiency. As a result, during the refueling process, the liquid level in the U-shaped tube 8 near the float 21 gradually rises under the action of liquid pressure. At the same time, the air in the cavity formed between the liquid level and the separator membrane is compressed and pushes the separator membrane upward. As the liquid level rises, the float 21 is lifted by buoyancy. Under the combined action of the upward push of the separator membrane and buoyancy, the top plate 23 and the top rod 22 move upward. When the top plate 23 contacts the hammer handle, the direction of the force exerted by the top plate 23 on the hammer handle is not in a straight line with the longitudinal direction of the spring 29, causing the hammer handle to deflect. When the hammer reaches its limit, spring 29 releases its potential energy and resets the hammer head and handle. The hammer head strikes bell 26, producing a sound to alert personnel. Personnel then remove the threaded sleeve 16 and the flexible cylinder 10 via the threaded connection. Because the conical sleeve 13 and the constricted tube 14 form a cone shape, when the flexible cylinder 10 is removed from the mounting sleeve 3, the conical sleeve 13 and the constricted tube 14 carry away any particulate impurities from the flexible cylinder 10, preventing them from scattering. When the conical sleeve 13 is placed horizontally, it... As it is pulled out from the mounting sleeve 3, it gradually becomes vertical. When too many particulate impurities overflow from the conical sleeve 14, the originally inverted conical sleeve 13 and conical sleeve 14 are horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve 13 and conical sleeve 14, thereby preventing particulate impurities from falling through the tail of the flexible sleeve 10. After the flexible sleeve 10 is completely removed, the locking state is released by the claw, so that the flexible sleeve 10 is separated from the threaded sleeve 16, and then the flexible sleeve 10 can be cleaned or replaced.

[0041] Example 2 The method for using the embedded aircraft fuel tank oil impurity deposition alarm device includes the following steps: s1: Refueling is performed through the filler port. After the fuel enters the flexible cylinder, it is filtered through the gaps in the cylinder and enters the fuel tank through the outlet groove at the bottom of the U-shaped tube. s2: During the refueling process, particulate matter is filtered by the soft cylinder screen and left inside the soft cylinder. With prolonged use, particulate impurities accumulate in the soft cylinder, reducing the filtration efficiency. As a result, during the refueling process, the oil level in the U-shaped tube near the float gradually rises under the action of liquid pressure. At the same time, the air in the cavity formed between the liquid level and the separator membrane is compressed and pushes the separator membrane upward. As the oil level rises, the float rises due to buoyancy. s3: Under the combined action of the upward push of the separator membrane and buoyancy, the top plate and the top rod move upward. When the top plate contacts the hammer handle, the hammer handle deflects because the direction of the force exerted by the top plate on the hammer handle is not in the same straight line as the longitudinal direction of the spring. When the hammer handle deflects to the limit, the spring releases potential energy and resets the hammer head and hammer handle. The hammer head strikes the bell and makes a sound to remind people. S4: Personnel remove the threaded sleeve and flexible cylinder through the threaded sleeve with the threaded connection. Since the conical sleeve and the conical tube form a cone shape, when the flexible cylinder is removed from the installation sleeve, the conical sleeve and the conical tube carry out the particulate impurities in the flexible cylinder and prevent the particulate impurities from scattering out. When the horizontally placed conical sleeve is pulled out of the installation sleeve, it gradually becomes vertical. When too many particulate impurities overflow from the conical tube, the originally inverted conical sleeve and conical tube are horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve and conical tube, thereby preventing the particulate impurities from falling out through the tail of the flexible cylinder. s5: After the soft tube is completely removed, the locking state is released by the chuck, so that the soft tube is separated from the threaded sleeve. Then the soft tube can be cleaned or replaced.

[0042] This embedded aircraft fuel tank fluid impurity alarm device detects excessive particulate impurities accumulating in the fuel filler tube. During refueling, the impurities clog the gaps in the filler tube, reducing fuel flow and causing the fuel level to rise. This raises the float and deflects the hammer head and handle. Once the handle separates from the top plate, a spring returns the hammer head and handle to their original position, triggering a ringing alarm to stop refueling and require cleaning of the fuel filler tube. This method allows for simultaneous fuel filtration and self-checking of fuel filler tube blockage during refueling, enabling alarms to be triggered after multiple refueling cycles, thus improving detection efficiency.

Claims

1. An embedded aircraft fuel tank oil impurity deposition alarm device, characterized in that: The system includes an oil tank (1), a maintenance component (4), a sealing component (5), a triggering component (7), and an alarm component (6). The top of the oil tank (1) has an oil inlet (2) and a mounting sleeve (3) arranged side-by-side. The maintenance component (4) includes a U-shaped tube (8) and a flexible cylinder (10) fitted inside the U-shaped tube (8). The lower part of the oil inlet (2) and the lower part of the mounting sleeve (3) are connected via the U-shaped tube (8), and the bottom of the U-shaped tube (8) has an oil outlet groove (9). A connecting device (11) for connecting to the triggering component (7) is fixedly installed at the opening of the flexible cylinder (10) on the side of the mounting sleeve (3). The flexible cylinder (10) has... The sleeve (10) has a gap for filtering impurities in the fuel. A conical sleeve (13) is fixedly fitted inside the sleeve (10), and a conical tube (14) is fixedly connected to the conical part of the sleeve (13) for intercepting impurities in the fuel. A sealing assembly (5) is connected above the mounting sleeve (3). An alarm assembly (6) is provided on the sealing assembly (5), and the lower end of the alarm assembly (6) contacts the trigger assembly (7) that penetrates the sealing assembly (5). The trigger assembly (7) is used to trigger the alarm assembly (6) when impurities are deposited after the sleeve (10) filters the fuel, causing the air pressure inside the sleeve (10) to increase and the fuel buoyancy to push the trigger assembly (7) to trigger the alarm assembly (6).

2. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 1, characterized in that: The connecting device (11) is provided with a pull ring (12) in the middle to connect to the triggering component (7).

3. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 2, characterized in that: The sealing assembly (5) includes a cap (15) and a threaded sleeve (16). The bottom of the cap (15) is connected to the threaded sleeve (16) as a whole. The threaded sleeve (16) is connected to the mounting sleeve (3) for sealing the mounting sleeve (3). The threaded sleeve (16) has a movable cavity (17) inside. A funnel-shaped separator (18) is fixedly connected to the inner wall of the movable cavity (17). The funnel-shaped separator (18) has a small opening facing downward. The separator is used to isolate the inside and outside environment of the oil tank (1). A protrusion (19) is fixedly connected to the bottom of the threaded sleeve (16). An annular claw (20) is fixedly connected to the bottom of the protrusion (19). The annular claw (20) is connected to the pull ring (12) for connecting the soft cylinder (10) and the cap (15).

4. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 3, characterized in that: The triggering assembly (7) includes a float (21) and a push rod (22). The bottom of the push rod (22) is threaded to the top of the float (21), and the top of the push rod (22) extends upward from the annular claw (20) through the cover (15). A top plate (23) is connected to the top of the push rod (22), and the top plate (23) contacts the cover (15). A fixing ring (24) is sleeved on the push rod (22), and the fixing ring (24) is used to support the float (21).

5. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 4, characterized in that: The alarm assembly (6) includes a fixed rod (25), a bell (26), and a crossbar (27). One end of the crossbar (27) is fixedly connected to the top of the fixed rod (25), and a bell hammer (28) is provided below the other end of the crossbar (27). A spring (29) is provided on the part of the crossbar (27) above the bell hammer (28). The bell (26) is sleeved on the top of the fixed rod (25), and the crossbar (27) is located above the bell (26). The bell hammer (28) is located above the top plate (23) and below the bell (26). The bell hammer (28) is triggered by the top plate (23) to trigger the bell (26), and the bell (26) is reset by the spring (29) on the bell hammer (28) contacting the crossbar (27).

6. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 2, characterized in that: The cone sleeve (13) is provided in 4 sets to ensure unidirectional flow of fuel.

7. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 4, characterized in that: The diameter of the fixing ring (24) is larger than the small opening diameter of the funnel-shaped separator membrane (18).

8. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 3, characterized in that: The ring-shaped claw (20) is an elastic ring-shaped claw (20).

9. The embedded aircraft fuel tank oil impurity deposition alarm device according to claim 6, characterized in that: The opening tube (14) is oriented toward the mounting sleeve (3).

10. The method of using the embedded aircraft fuel tank oil impurity deposition alarm device according to claim 1, wherein the device as described in claim 1 is characterized in that: The specific steps are as follows: Step s1: Refueling is performed through the oil filling port (2). After the fuel enters the soft cylinder (10), the gaps on the soft cylinder (10) filter the fuel. The fuel enters the fuel tank (1) through the oil outlet groove (9) at the bottom of the U-shaped tube (8). Step s2: As the soft tube (10) filters impurities, the impurity particles accumulate in the soft tube (10), causing the liquid level near the float (21) in the U-shaped tube (8) to gradually rise, causing the float (21) to rise under the action of buoyancy, and the air in the cavity formed between the liquid level and the separator membrane is compressed and pushes the separator membrane upward. Step s3: Under the combined action of the upward push of the separator membrane and buoyancy, the top plate (23) and the top rod (22) move upward. After the top plate (23) contacts the hammer handle, the hammer handle deflects. When the hammer handle deflects to the limit, the spring (29) releases potential energy and resets the hammer head and hammer handle. The hammer head strikes the bell (26) to make a sound, prompting personnel to clean or replace the soft tube (10). Step s4: Take out the threaded sleeve (16) and the soft cylinder (10), and use the conical sleeve (13) and the conical tube (14) to carry out the particulate impurities in the soft cylinder (10) and prevent the particulate impurities from scattering. Step s5: After the soft tube (10) is completely removed, the locking state is released by the chuck, so that the soft tube (10) is separated from the threaded sleeve (16). Then the soft tube (10) can be cleaned or replaced.

11. The method of using the embedded aircraft fuel tank oil impurity deposition alarm device according to claim 10, characterized in that: In step s4, as the horizontally placed conical sleeve (13) is pulled out from the mounting sleeve (3), it gradually becomes vertical. When too many particulate impurities overflow from the constriction tube (14), the originally inverted conical sleeve (13) and constriction tube (14) are horizontally distributed, so that the overflowing particulate impurities are intercepted and blocked by the subsequent horizontal conical sleeve (13) and constriction tube (14), preventing particulate impurities from falling through the tail of the soft tube (10).

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