An aviation starter generator with internal cleaning function

Abstract

The present invention discloses an aviation starter generator with an internal cleaning function, relating to the technical field of starter generators. The starter generator comprises a body and a motor shaft, wherein the motor shaft is rotatably mounted within the body, a rotor is disposed on the motor shaft, a stator is disposed within the body, two air vents are disposed on the body, two air filter assemblies are symmetrically disposed within the body, the two air filter assemblies are located outside the stator and rotor, and two sealing assemblies are disposed on the motor shaft, the two sealing assemblies are located in the two air vents, and the two sealing assemblies are located outside the two air filter assemblies. When the motor shaft is operating, the sealing assemblies open the air vents, one air filter assembly draws in external air and introduces the filtered air into the body, and the other air filter assembly discharges heat-carrying air from the air vents. When the motor shaft is reversing, the air filter assembly discharges filtered dust and debris generated by bearing operation out of the body, thereby achieving internal cleaning and heat dissipation of the starter generator.

Description

Technical Field

[0001] The invention relates to the technical field of starter generators, in particular to an aviation starter generator with an internal cleaning function. Background Art

[0002] An aircraft starter-generator is a mechatronic device that combines engine starting and power generation functions. In starting mode, it operates as a motor, driving the engine to ignition speed. In power generation mode, it converts the engine's mechanical energy into electrical energy to power onboard equipment. Starter-generators are widely used in modern aircraft power systems, meeting the aircraft's power needs under various operating conditions. During operation, aircraft starter-generators can accumulate various impurities, including dust, moisture, and humidity. Dust can clog vents and increase wear, while moisture and humidity can cause corrosion of metal components. Therefore, to ensure performance and reliability, regular maintenance and targeted cleaning are essential. This can significantly extend the life of the equipment and reduce the risk of in-flight failures. However, disassembling the starter-generator for internal cleaning can damage components and shorten its service life. Therefore, minimizing disassembly frequency and extending cleaning and maintenance intervals are essential. Summary of the Invention

[0003] The object of the present invention is to provide an aviation starter generator with an internal cleaning function to solve the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an aircraft starter-generator with an internal cleaning function, comprising a body and a motor shaft. A stator and a rotor are mounted within the body, the motor shaft being inserted through the body, and the rotor being mounted on the motor shaft. Two air filter assemblies are symmetrically mounted within the body, located outside the stator and rotor. The body is provided with two air vents, and sealing assemblies are disposed on the motor shaft at positions corresponding to the air vents. When the motor shaft is operating, the sealing assemblies open the air vents; when the motor shaft stops operating, the sealing assemblies close the air vents. When the motor shaft is operating, the sealing assemblies open the air vents, one air filter assembly draws in external air and directs filtered air into the body, while the other air filter assembly discharges heat-carrying air from the body through the air vents, thereby dissipating heat from the starter-generator through the air flow. When the motor shaft reverses direction, the air filter assembly discharges filtered dust and debris generated by bearing operation from the body, thereby achieving internal cleaning and continuous heat dissipation of the starter-generator. When the motor shaft stops operating, the sealing assembly seals the air vents to prevent external dust and moisture from entering the body.

[0005] The air filter assembly includes a fan mounted on the motor shaft and a cleaning plate mounted within the housing. The motor shaft passes through the cleaning plate, and a bearing is mounted at the center of the cleaning plate, connected to the motor shaft. Two fans are located between the cleaning plates, and a dust cloth for filtering air is placed on the cleaning plate. The cleaning plate is mounted within the housing and supports the motor shaft via the bearing, allowing the motor shaft to rotate and be mounted on the housing. The dust cloth is made of elastic fabric that can filter airborne dust and dirt, and can be made of single or multiple layers. During operation, the fan rotates with the motor shaft, forcing air through the housing. The dust cloth on one cleaning plate filters dust from the air, preventing it from coming into contact with the stator, rotor, and other structures. When the motor shaft reverses, the fan reverses the air flow, removing dust accumulated on the dust cloth and carrying it out of the housing. During this period, the dust cloth on the other cleaning plate filters dust from the air. When the motor shaft reverses again, the air flow clears the dust cloth on that cleaning plate.

[0006] Both ends of the motor shaft pass through the body, and the body expands its aperture outward at the position where the motor shaft passes through, forming an air outlet between the body and the motor shaft;

[0007] An annular mounting groove is provided on the motor shaft at a position corresponding to the air outlet. The sealing assembly includes a sealing ring provided in the mounting groove and a plurality of telescopic tubes connected to the interior of the sealing ring. The cross-section of the sealing ring is "L"-shaped and the sealing ring is a hollow airbag structure. An air passage connected to the sealing ring is provided on the motor shaft. The telescopic tube is installed on the outside of the air passage. The telescopic tube is a telescopic bellows structure with a spring provided inside. A net bag is provided at one end of the telescopic tube, and activated alumina is provided inside the net bag.

[0008] When the motor shaft is not rotating, one end of the sealing ring expands and seals the air vent, the expansion tube is in its normal position, and the net bag is positioned close to the air vent. When the motor shaft is rotating, centrifugal force stretches the expansion tube, causing the activated alumina to stretch the spring, drawing air from the sealing ring. The expanded end of the sealing ring contracts into the mounting groove, forming several folds on its surface, and the air vent opens. The activated alumina (not shown) dehumidifies the air entering the machine and also acts as a counterweight. When the motor shaft is not rotating, the activated alumina is positioned close to the air vent. When air enters the machine, the activated alumina quickly absorbs moisture from the air. When the motor shaft is rotating, the activated alumina stretches the expansion tube, drawing some air from the sealing ring, causing the expanded end of the sealing ring to contract into the mounting groove, opening the air vent. After the expansion of the expansion tube, the activated alumina is positioned near the dust removal cloth, absorbing moisture near the cloth and keeping it dry during dust removal. After the motor shaft stops running, the elasticity of the spring and the telescopic tube resets the telescopic tube and drives the net bag back to its original position, and the sealing ring expands again to seal the air outlet.

[0009] The air filter assembly also includes a housing mounted inside the body. The outer diameter of the housing is smaller than the inner diameter of the body, and a gap exists between the housing and the body. The stator is mounted on the housing, and the cleaning plate is connected to the housing. Isolation plates are installed inside the housing at both ends of the stator and rotor. The isolation plates are provided with a number of slots for ventilation. The housing is circumferentially provided with a number of air holes at both ends, and the air holes are located between the isolation plates and the fan. During the air delivery process of the fan, part of the air passes directly through the isolation plates and flows between the stator and rotor. Another part passes through the air holes and flows through the gap between the housing and the body, and flows out of the air holes at the other end, and is finally discharged from the body. During the air flow process, the air achieves the effect of heat dissipation from both the outside and inside of the stator.

[0010] The cleaning plate is centrally located with three sequentially arranged shaft slots of varying diameters. The larger shaft slot is located near the fan, while the smaller shaft slot is located near the sealing assembly. The bearings installed in the center of the cleaning plate include a ball bearing and a thrust ball bearing. The thrust ball bearing is installed in the larger shaft slot, while the ball bearing is installed in the medium shaft slot. The smaller shaft slot has a diameter greater than the inner diameter of the outer steel ring of the ball bearing and smaller than the outer diameter of the outer steel ring. The thrust ball bearing and the ball bearing do not contact each other. Both the ball bearing and the thrust ball bearing are used to connect the cleaning plate to the motor shaft. The smaller shaft slot is located near the air vent. When the air vent is opened and air is discharged from the motor body, the air flows near the smaller shaft slot. Debris generated by wear in the ball bearing is carried away by the airflow and eventually flows out of the motor body through the air vent, thereby reducing the amount of debris inside the motor body and cleaning the debris inside the starter generator.

[0011] The cleaning plate is provided with multiple fan-shaped notches. An embedding slot is milled outward from one end of the fan-shaped notches on the end surface of the cleaning plate near the fan. The fan-shaped dust cloth is installed in the embedding slot. A pressure plate is provided on the motor shaft at a position adjacent to the cleaning plate. A gap exists between the pressure plate and the cleaning plate. A plurality of ventilation slots are provided axially along the pressure plate. The ventilation slots are used to circulate air. The pressure plate rotates with the motor shaft. If the dust cloth bulges outward due to the impact of air, the pressure plate suppresses the protruding dust cloth to prevent excessive deformation.

[0012] The thickness of the dust cloth is less than the depth of the embedding groove. One end of the dust cloth is fixed to the embedding groove. A fan-shaped toggle groove is provided at one end of the fan-shaped notch on the cleaning plate. The toggle groove is deeper than the embedding groove. Slide grooves are provided on the two curved surfaces of the toggle groove. A long pull plate is slidably installed in the toggle groove through the slide groove. The movable end of the dust cloth is installed on the pull plate. An inner pressure ring and an outer pressure ring are provided on the pressure plate. The inner pressure ring and the outer pressure ring are respectively located on the inner arc and the outer arc of the dust cloth. There is a gap between the inner pressure ring and the outer pressure ring and the cleaning plate. The thickness of the dust cloth is greater than the width of the gap. The inner pressure ring and the outer pressure ring are used to press the edge position of the dust cloth to prevent the edge of the dust cloth from leaking out of the embedding groove under the impact of air, thereby ensuring the dust cloth's filtering effect on the air.

[0013] The two ends of the pull plate are provided with pin shafts, and the pin shafts are located in the slide groove. The end face of the pull plate close to the cleaning plate contacts the groove surface of the toggle groove, and a semicircular groove is provided on the other side of the pull plate. The semicircular groove is provided with two rotating grooves with an radian less than π and a "T"-shaped slide. One end of the rotating groove is milled through the pull plate, and a semicircular bar is rotatably installed in the semicircular groove. The semicircular bar is provided with two sliders with an radian less than π / 2 and a "T"-shaped cross-section. The slider is located in the rotating groove, and a convex plate is provided on the semicircular bar. The semicircular bar is connected to the movable end of the dust cleaning cloth, and the convex plate does not contact the pressure plate. The pressure plate is provided with a toggle plate, and the toggle plate does not contact the cleaning plate. One end of the toggle groove is provided with a retraction groove along the axial direction of the cleaning plate, and the pull plate can be angularly deflected in the retraction groove. As the pressure plate rotates along with the motor shaft, the paddle moves in a circular motion with it, coming into contact with the cam during this motion. As the paddle pushes the cam toward the dust cloth, it drives the semicircular bar to rotate within its groove. As the semicircular bar rotates, the cam gradually moves out of the paddle's motion, allowing the paddle to slide past it. As the cam rotates with the semicircular bar, the semicircular bar pulls on one end of the dust cloth, briefly stretching it. Once the paddle has passed the cam, the elastic pull of the dust cloth returns the cam, along with the semicircular bar, to its original position. When the paddle moves the convex plate away from the dust-cleaning cloth, the convex plate cannot drive the semicircular bar to rotate in the rotating groove due to the restriction of the rotating groove and the slider. In this case, the convex plate and the semicircular bar form a whole, and under the limitation of the end face of the rotating groove, the paddle plate pushes the pull plate to move in the paddle groove through the convex plate during the movement, so that the dust-cleaning cloth is stretched a long distance. When the pull plate moves to the position of the retraction groove, the pull plate loses the limitation of the end face of the rotating groove. Under the push of the paddle plate, the support of the pin shaft and the spatial support of the retraction groove, the pull plate undergoes an angular deflection in the retraction groove, causing the paddle plate to slide over the convex plate. Under the elastic action of the dust-cleaning cloth, the pull plate is pulled back to its original position by the dust-cleaning cloth.

[0014] The ventilation slot is an inclined slot, and there is an angle between the center line of the inclined slot and the center line of the pressure plate. The inclined direction of the inclined slot is the same as the twisting direction of the fan blade. When the pressure plate rotates, it can act as a fan to assist air flow.

[0015] Compared with the prior art, the beneficial effects of the present invention are: when the motor shaft is running, the sealing component opens the air outlet to facilitate heat dissipation and cleaning inside the starter generator; after the motor shaft stops running, the sealing component closes the air outlet to prevent external dust and water vapor from entering the interior of the machine body.

[0016] One air filter assembly draws in outside air and directs filtered air into the engine body, while the other air filter assembly discharges heat-carrying air out of the engine body through the vents. This air flow dissipates heat from the starter generator. During motor shaft reversing, the air filter assembly removes filtered dust and some debris generated by bearing operation, reducing debris accumulation inside the starter generator. This ensures cleanliness and continuous heat dissipation within the starter generator, extends the internal cleaning cycle, and reduces the need to disassemble the starter generator for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall three-dimensional diagram of the present invention;

[0018] Figure 2 A half-cut perspective view of the present invention;

[0019] Figure 3 For the present invention Figure 2 A partial enlarged view of area A in the middle;

[0020] Figure 4 A diagram showing the positional relationship between the isolation plate and the fan of the present invention;

[0021] Figure 5 A diagram showing the positional relationship between the fan, the pressure plate, and the cleaning plate of the present invention;

[0022] Figure 6 An exploded view of the pressure plate and the cleaning plate of the present invention;

[0023] Figure 7 For the present invention Figure 6 A partial enlarged view of the middle B area;

[0024] Figure 8 An exploded view of the pull plate, dust removal cloth and cleaning plate of the present invention;

[0025] Figure 9 An exploded view of the pull plate of the present invention;

[0026] Figure 10 A partial cross-sectional view of the press plate and the cleaning plate of the present invention when in cooperation;

[0027] Figure 11 A cross-sectional view of the connection between the pull plate and the semicircular bar of the present invention;

[0028] Figure 12 It is a three-dimensional view of the pressing plate of the present invention.

[0029] In the figure: 1. Machine body; 2. Motor shaft; 3. Cover; 4. Stator; 5. Rotor; 6. Isolation plate; 7. Guide ring; 8. Air hole; 9. Cleaning plate; 10. Fan; 11. Sealing ring; 12. Telescopic tube; 13. Net bag; 14. Ball bearing; 15. Thrust ball bearing; 16. Pressure plate; 17. Dust cloth; 18. Inclined groove; 19. Return groove; 20. Slide; 21. Pull plate; 22. Protruding plate; 23. Semicircular bar; 24. Outer pressure ring; 25. Pulley. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] When installing and using the starter generator, a mechanism for spraying lubricating oil can be installed at both ends of the starter generator to apply lubricating oil to the sealing ring 11 to lubricate the sealing ring 11 and the body 1, reducing the wear of the sealing ring 11. At the same time, the lubricating oil is also used to achieve oil sealing, thereby improving the sealing effect of the sealing ring 11.

[0032] Example: Figure 1 - Figure 12 As shown, the present invention provides a technical solution, an aviation starter generator with an internal cleaning function, including a body 1 and a motor shaft 2, a stator 4 and a rotor 5 are installed inside the body 1, the motor shaft 2 is inserted into the body 1, and the rotor 5 is installed on the motor shaft 2, two air filter assemblies are symmetrically installed inside the body 1, and the two air filter assemblies are located outside the stator 4 and the rotor 5, two air outlets are provided on the body 1, and a sealing assembly is provided at the position corresponding to the air outlet on the motor shaft 2. When the motor shaft 2 is running, the sealing assembly opens the air outlet, and after the motor shaft 2 stops running, the sealing assembly closes the air outlet.

[0033] Both ends of the motor shaft 2 pass through the body 1. The body 1 expands its aperture outward at the position where the motor shaft 2 passes through, and forms an air outlet between the body 1 and the motor shaft 2.

[0034] An annular mounting groove is provided at the position corresponding to the air outlet on the motor shaft 2. The sealing assembly includes a sealing ring 11 arranged in the mounting groove and a plurality of telescopic tubes 12 connected to the interior of the sealing ring 11. The cross-section of the sealing ring 11 is "L"-shaped, and the sealing ring 11 is a hollow airbag structure. An air duct connected to the sealing ring 11 is provided on the motor shaft 2. The telescopic tube 12 is installed on the outside of the air duct. The telescopic tube 12 is a telescopic bellows structure and a spring is provided inside. A net bag 13 is provided at one end of the telescopic tube 12, and activated alumina is provided inside the net bag 13.

[0035] When motor shaft 2 is not rotating, one end of sealing ring 11 expands and seals the air vent, telescopic tube 12 is in its normal position, and net bag 13 is positioned close to the air vent. When motor shaft 2 is rotating, centrifugal force causes telescopic tube 12 to be stretched by the activated alumina, which in turn stretches the spring. This draws air from sealing ring 11, causing the expanded end of sealing ring 11 to retract into the mounting groove, forming several wrinkles on its surface, and opening the air vent. After motor shaft 2 stops rotating, the elasticity of the spring and telescopic tube 12 causes telescopic tube 12 to return to its original position, pulling net bag 13 back into its original position. Sealing ring 11 expands again, sealing the air vent.

[0036] The activated alumina dehumidifies the air entering the body 1 and also acts as a counterweight.

[0037] When the motor shaft 2 is not running, the activated alumina is close to the air outlet. When air squeezes into the body 1, the activated alumina can quickly adsorb water vapor in the air.

[0038] When the motor shaft 2 is running, the activated alumina stretches the telescopic tube 12, and the telescopic tube 12 extracts part of the gas in the sealing ring 11, causing the expanded end of the sealing ring 11 to shrink into the mounting groove, so that the air outlet is opened. After the telescopic tube 12 is stretched, the activated alumina is located near the dust removal cloth 17, which can absorb the water vapor near the dust removal cloth 17, so that the dust removal cloth 17 remains dry to a certain extent during dust removal.

[0039] The air filter assembly includes a cover 3 installed inside the body 1, a fan 10 installed on the motor shaft 2, and a cleaning plate 9 connected to the inside of the cover 3. The stator 4 is installed on the cover 3. The outer diameter of the cover 3 is smaller than the inner diameter of the body 1. There is a gap between the cover 3 and the body 1. Several air holes 8 are circumferentially arranged at both ends of the cover 3. The air holes 8 are located between the isolation plate 6 and the fan 10. Isolation plates 6 are installed at both ends of the stator 4 and the rotor 5 inside the cover 3. The motor shaft 2 passes through the cleaning plate 9. The two isolation plates 6 are located between the two fans 10. The two fans 10 are located between the two cleaning plates 9. A dust-removing cloth 17 for filtering air is provided on the cleaning plate 9. Several slots for ventilation are provided on the isolation plate 6. A guide ring 7 is provided on the side of the isolation plate 6 close to the fan 10 (the guide ring 7 is not drawn on one of the isolation plates 6). The guide ring 7 diverts and guides the air, so that part of the air enters the gap between the cover 3 and the body 1 from the air holes 8. Three shaft grooves of different diameters are arranged in sequence at the center of the cleaning plate 9. The shaft groove with a large diameter is close to the fan 10, and the shaft groove with a small diameter is close to the sealing assembly. The bearings installed at the center of the cleaning plate 9 include a ball bearing 14 and a thrust ball bearing 15. The thrust ball bearing 15 is installed in the shaft groove with a large diameter, and the ball bearing 14 is installed in the shaft groove with a medium diameter. The diameter of the shaft groove with a small diameter is larger than the inner diameter of the outer steel ring of the ball bearing 14 and smaller than the outer diameter of the outer steel ring. The thrust ball bearing 15 and the ball bearing 14 do not contact each other. The ball bearing 14 and the thrust ball bearing 15 are both used to connect the cleaning plate 9 and the motor shaft 2. The thrust ball bearing 15 is located on the side of the ball bearing 14 close to the pressure plate 16. The thrust ball bearing 15 can prevent the debris generated by the ball bearing 14 from flowing to the stator 4 and the rotor 5.

[0040] A pressure plate 16 is provided on the motor shaft 2 at a position on one side of the cleaning plate 9. A gap exists between the pressure plate 16 and the cleaning plate 9. A plurality of ventilation grooves are provided axially on the pressure plate 16. The ventilation grooves are inclined grooves 18. An angle is formed between the centerline of the inclined grooves 18 and the centerline of the pressure plate 16. The inclination direction of the inclined grooves 18 is the same as the torsion direction of the fan 10 blades. When the pressure plate 16 rotates, it can function as the fan 10 and assist in air flow. The pressure plate 16 rotates along with the motor shaft 2. If the dust removal cloth 17 bulges out due to the impact of the air, the pressure plate 16 suppresses the protruding dust removal cloth 17 to prevent excessive deformation of the dust removal cloth 17.

[0041] The raw material for making the dust removal cloth 17 is a cloth that is elastic and can filter air dust and dirt. The dust removal cloth 17 is made of a single layer or multiple layers of cloth.

[0042] During the operation of the motor shaft 2, the fan 10 rotates along with the motor shaft 2, and the fan 10 allows air to pass through the body 1. The dust removal cloth 17 on one of the cleaning plates 9 filters dust in the air to prevent the dust from contacting structures such as the stator 4 and the rotor 5.

[0043] The cleaning plate 9 is provided with a plurality of fan-shaped notches. On the end face of the cleaning plate 9 close to the fan 10, an embedding groove is milled outward at one end of the fan-shaped notch. The dust-removing cloth 17 is fan-shaped and installed in the embedding groove. The thickness of the dust-removing cloth 17 is less than the depth of the embedding groove. One end of the dust-removing cloth 17 is fixed to the embedding groove. A fan-shaped toggle groove is provided at one end of the fan-shaped notch on the cleaning plate 9. The toggle groove is deeper than the embedding groove. A slide groove 20 is provided on the two arcuate surfaces of the toggle groove. A long strip of pull plate 21 is slidably installed through the slide groove 20. Pins are provided at both ends of the pull plate 21. The pins are located in the slide groove 20. The end face of the pull plate 21 close to the cleaning plate 9 contacts the groove surface of the toggle groove. A semicircular groove is provided on the other side of the plate 21, and two rotating grooves with a radian less than π and a "T"-shaped slide are provided on the semicircular groove. One end of the rotating groove is milled through the pull plate 21, and a semicircular bar 23 is rotatably installed in the semicircular groove. The semicircular bar 23 is provided with two sliders with a radian less than π / 2 and a "T"-shaped cross-section. The slider is located in the rotating groove, and a convex plate 22 is provided on the semicircular bar 23. The semicircular bar 23 is connected to the movable end of the dust-removing cloth 17, and the convex plate 22 does not contact the pressure plate 16. A dial plate 25 is provided on the pressure plate 16, and the dial plate 25 does not contact the cleaning plate 9. A retraction groove 19 is provided at one end of the toggle groove along the axial direction of the cleaning plate 9, and the pull plate 21 can be angularly deflected in the retraction groove 19.

[0044] The pressure plate 16 is provided with an inner and outer pressure ring 24, which are positioned on the inner and outer arcs of the dust cloth 17, respectively. A gap exists between the inner and outer pressure rings 24 and the cleaning plate 9, and the thickness of the dust cloth 17 is greater than the width of the gap. The inner and outer pressure rings 24 are used to suppress the edges of the dust cloth 17, preventing them from leaking out of the embedded groove under the impact of air, thereby ensuring the dust cloth 17's filtering effect on the air.

[0045] The working principle of the present invention is as follows: when the motor shaft 2 is running, under the action of centrifugation, the telescopic tube 12 is stretched by the activated alumina, the spring is stretched, the telescopic tube 12 extracts the gas in the sealing ring 11, and the expanded end of the sealing ring 11 shrinks into the mounting groove and forms a number of wrinkles on the surface. The two air vents are opened, one for air intake and the other for air discharge. The activated alumina dehumidifies the air entering the body 1. Under the extraction and transportation of the fan 10, the air at the air inlet passes through the dust-removing cloth 17, and the dust-removing cloth 17 intercepts the dust in the air. When the pressure plate 16 rotates, it can play the role of the fan 10 and assist the air flow, and the pressure plate 16 rotates with the motor shaft 2. If the dust-removing cloth 17 is convexly deformed under the impact of the air, the pressure plate 16 suppresses the protruding dust-removing cloth 17.

[0046] The paddle 25 moves in a circular motion along with the pressure plate 16, and during this motion, it comes into contact with the raised plate 22. As the paddle 25 pushes the raised plate 22 toward the dust cloth 17, the raised plate 22 drives the semicircular bar 23 to rotate within the semicircular groove. As the semicircular bar 23 rotates, the raised plate 22 gradually moves out of the movement space of the paddle 25, allowing the paddle 25 to slide over the raised plate 22. As the raised plate 22 rotates along with the semicircular bar 23, the semicircular bar 23 pulls on one end of the dust cloth 17, briefly stretching it. After the paddle 25 slides over the raised plate 22, the elastic pull of the dust cloth 17 returns the raised plate 22 and the semicircular bar 23 to their original position.

[0047] During the process of air delivery by the fan 10, part of the air directly passes through the isolation plate 6 and flows between the stator 4 and the rotor 5. The other part passes through the air hole 8 and flows through the gap between the cover 3 and the body 1, and flows out from the air hole 8 at the other end, and is finally discharged from the body 1 through the air outlet. During the flow of air, the effect of heat dissipation is achieved from the outside and inside of the stator 4.

[0048] When air is discharged from the body 1 through the air outlet, the air flows near the small-diameter shaft groove, and some debris generated by wear in the ball bearing 14 will be carried out by the air flow and eventually flow out of the body 1 from the air outlet, thereby reducing the amount of debris inside the body 1 and cleaning the debris inside the starter generator.

[0049] When it is necessary to clean the dust on the dust removal cloth 17 at the air inlet, the motor shaft 2 is reversed and the fan 10 reverses the air flow. The original air inlet becomes the air outlet, and the original air outlet becomes the air inlet. The air enters the body 1 from the air outlet and is discharged from the air inlet. The dust accumulated on the dust removal cloth 17 is removed by the air flow, and the dust is taken out of the body 1 by the air flow. During this period, the dust removal cloth 17 at the air outlet filters the dust in the air.

[0050] When cleaning the dust cloth 17 at the air inlet, the dial plate 25 dials the convex plate 22 in the direction away from the dust cloth 17. Under the restriction of the rotating groove and the slider, the convex plate 22 cannot drive the semicircular bar 23 to rotate in the rotating groove. In this case, the convex plate 22 and the semicircular bar 23 form a whole, and under the limitation of the end face of the rotating groove, the dial plate 25 pushes the pull plate 21 to move in the dial groove through the convex plate 22, so that the dust cloth 17 is stretched a long distance. When the pull plate 21 moves to the position of the retraction groove 19, the pull plate 21 loses the limitation of the end face of the rotating groove. Under the push of the dial plate 25, the support of the pin shaft and the spatial support of the retraction groove 19, the pull plate 21 is deflected at an angle in the retraction groove 19, so that the dial plate 25 slides over the convex plate 22, and under the elastic action of the dust cloth 17, the pull plate 21 is pulled back to its original position by the dust cloth 17. The dust on the dust removal cloth 17 is bounced off by stretching and rebounding actions, and the dust on the dust removal cloth 17 is cleaned by multiple stretching and rebounding actions and the flow of air, thereby improving the dust cleaning effect.

[0051] When air is discharged from the body 1 through the air inlet, the air flows near the small-diameter shaft groove, and some debris generated by wear in the ball bearing 14 will be carried out by the air flow and eventually flow out of the body 1 from the air inlet, thereby reducing the amount of debris inside the body 1 and cleaning the debris inside the starter generator.

[0052] When the dust cloth 17 at the air outlet needs to be cleaned, the motor shaft 2 is reversed again, and the air flow is used to clean the dust cloth 17. During this cleaning period, the dust cloth 17 will not be stretched for a long distance, and the pull plate 21 will not move to the position of the retraction groove 19. The dust cloth 17 is only cleaned through long-term ventilation.

[0053] After the motor shaft 2 stops running, under the elasticity of the spring and the telescopic tube 12, the telescopic tube 12 resets and drives the net bag 13 back to its original position, and the sealing ring 11 expands again to block the air outlet.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An aviation starter generator with an internal cleaning function, comprising a body (1) and a motor shaft (2), wherein a stator (4) and a rotor (5) are installed inside the body (1), the motor shaft (2) is inserted into the body (1), and the rotor (5) is installed on the motor shaft (2), characterized in that: Two air filter assemblies are symmetrically installed inside the body (1), and the two air filter assemblies are located outside the stator (4) and the rotor (5). Two air outlets are provided on the body (1), and sealing assemblies are provided at positions corresponding to the air outlets on the motor shaft (2). When the motor shaft (2) is running, the sealing assembly opens the air outlet, and when the motor shaft (2) stops running, the sealing assembly closes the air outlet. An annular mounting groove is provided on the motor shaft (2) at a position corresponding to the air outlet. The sealing assembly comprises a sealing ring (11) provided in the mounting groove and a plurality of telescopic tubes (12) connected to the interior of the sealing ring (11). The cross section of the sealing ring (11) is "L"-shaped. The sealing ring (11) is a hollow airbag structure. An air passage connected to the sealing ring (11) is provided on the motor shaft (2). The telescopic tube (12) is installed on the outside of the air passage. The telescopic tube (12) is a telescopic bellows structure and a spring is provided inside. A net bag (13) is provided at one end of the telescopic tube (12). Activated alumina is provided inside the net bag (13). The air filter assembly comprises a fan (10) mounted on the motor shaft (2), and a cleaning plate (9) mounted inside the body (1), wherein the motor shaft (2) passes through the cleaning plate (9), a bearing is mounted at the center of the cleaning plate (9), and the bearing is connected to the motor shaft (2), the two fans (10) are located between the cleaning plates (9), and a dust removal cloth (17) for filtering air is provided on the cleaning plate (9); The air filter assembly further comprises a cover (3) mounted inside the machine body (1), wherein the outer diameter of the cover (3) is smaller than the inner diameter of the machine body (1), and a gap exists between the cover (3) and the machine body (1). The stator (4) is mounted on the cover (3), and the cleaning plate (9) is connected to the cover (3). An isolation plate (6) is mounted inside the cover (3) at both ends of the stator (4) and the rotor (5), and a plurality of slots for ventilation are provided on the isolation plate (6). A plurality of air holes (8) are circumferentially provided at both ends of the cover (3), and the air holes (8) are located between the isolation plate (6) and the fan (10).

2. The aviation starter generator with internal cleaning function according to claim 1, characterized in that: When the motor shaft (2) is not running, one end of the sealing ring (11) expands and closes the air outlet, the telescopic tube (12) is in a normal state, and the net bag (13) is close to the air outlet; when the motor shaft (2) is running, under the centrifugal effect, the telescopic tube (12) is stretched by the activated alumina, the spring is stretched, the telescopic tube (12) extracts the gas in the sealing ring (11), the expanded end of the sealing ring (11) shrinks into the installation groove and forms a plurality of folds on the surface, and the air outlet is opened.

3. The aircraft starter generator with internal cleaning function according to claim 1, characterized in that: The cleaning plate (9) is provided with three shaft grooves of different diameters arranged in sequence at the center thereof, wherein the shaft groove with a large diameter is close to the fan (10), and the shaft groove with a small diameter is close to the sealing assembly. The bearings installed at the center thereof include a ball bearing (14) and a thrust ball bearing (15), wherein the thrust ball bearing (15) is installed in the shaft groove with a large diameter, and the ball bearing (14) is installed in the shaft groove with a medium diameter. The shaft groove with a small diameter has a diameter larger than the inner diameter of the outer steel ring of the ball bearing (14) and smaller than the outer diameter of the outer steel ring. The thrust ball bearing (15) and the ball bearing (14) do not contact each other. The ball bearing (14) and the thrust ball bearing (15) are both used to connect the cleaning plate (9) and the motor shaft (2).

4. The aviation starter generator with internal cleaning function according to claim 1, characterized in that: The cleaning plate (9) is provided with a plurality of fan-shaped notches. An embedding groove is milled outwardly from one end of the fan-shaped notch on the end face of the cleaning plate (9) close to the fan (10). The dust removal cloth (17) is fan-shaped and installed in the embedding groove. A pressing plate (16) is provided on the motor shaft (2) at a position located on one side of the cleaning plate (9). A gap is provided between the pressing plate (16) and the cleaning plate (9). A plurality of ventilation grooves are provided on the pressing plate (16) along the axial direction.

5. The aircraft starter generator with internal cleaning function according to claim 4, characterized in that: The thickness of the dust-removing cloth (17) is less than the depth of the embedding groove, one end of the dust-removing cloth (17) is fixed to the embedding groove, a fan-shaped toggle groove is provided at one end of the fan-shaped notch on the cleaning plate (9), the toggle groove is deeper than the embedding groove, and two arc-shaped surfaces of the toggle groove are provided with a slide groove (20), and the toggle groove is slidably installed with a long strip of pull plate (21) through the slide groove (20), and the movable end of the dust-removing cloth (17) is installed on the pull plate (21), and the pressure plate (16) is provided with an inner pressure ring and an outer pressure ring (24), and the inner pressure ring and the outer pressure ring (24) are respectively located on the inner arc line and the outer arc line of the dust-removing cloth (17); there is a gap between the inner pressure ring and the outer pressure ring (24) and the cleaning plate (9), and the thickness of the dust-removing cloth (17) is greater than the width of the gap.

6. The aircraft starter generator with internal cleaning function according to claim 5, characterized in that: The pull plate (21) is provided with a pin at both ends, and the pin is located in the slide groove (20). The end face of the pull plate (21) close to the cleaning plate (9) contacts the groove surface of the toggle groove. The other side of the pull plate (21) is provided with a semicircular groove. The semicircular groove is provided with two rotating grooves with a curvature less than π and a "T"-shaped slide. One end of the rotating groove is milled through the pull plate (21). A semicircular bar (23) is rotatably installed in the semicircular groove. The semicircular bar (23) is provided with two rotating grooves with a curvature less than π / 2 and a "T" cross section. The slider is located in a rotating groove, the semicircular bar (23) is provided with a convex plate (22), the semicircular bar (23) is connected to the movable end of the dust-removing cloth (17), the convex plate (22) does not contact the pressure plate (16), the pressure plate (16) is provided with a dial plate (25), the dial plate (25) does not contact the cleaning plate (9), one end of the dial groove is provided with a retraction groove (19) along the axial direction of the cleaning plate (9), and the pulling plate (21) can be angularly deflected in the retraction groove (19).

7. The aircraft starter generator with internal cleaning function according to claim 4, characterized in that: The ventilation groove is an oblique groove (18), and an angle exists between the center line of the oblique groove (18) and the center line of the pressing plate (16).

8. The aircraft starter generator with internal cleaning function according to claim 1, characterized in that: Both ends of the motor shaft (2) pass through the machine body (1); the machine body (1) expands its aperture outward at the position where the motor shaft (2) passes through, and forms an air outlet between the machine body (1) and the motor shaft (2).

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