Shaft end sealing structure and aero-engine

Abstract

The application discloses a shaft end sealing structure and an aero-engine, and belongs to the technical field of aero-engine sealing structures.The shaft end sealing structure comprises a bearing mounting seat, a rotating shaft rotatably mounted in the bearing mounting seat, a sealing runway which is interference-fitted on the outer wall of the rotating shaft, and a static sealing element which is sleeved on the outer ring of the sealing runway and fixed on the bearing mounting seat.The static sealing element comprises a sealing oil collecting disc and a sealing mounting seat which are arranged along the axial direction of the sealing runway in sequence, and a lip-shaped sealing ring which is interference-fitted between the sealing oil collecting disc and the sealing mounting seat.The side of the lip-shaped sealing ring close to the bearing is surrounded by the sealing mounting seat and the sealing runway to form a first sealing cavity, and the side of the lip-shaped sealing ring away from the bearing is surrounded by the sealing oil collecting disc and the sealing runway to form a second sealing cavity.The lip-shaped sealing ring is tightly sleeved on the outer wall of the sealing runway to seal the first sealing cavity, and the sealing oil collecting disc is abutted against the outer wall of the sealing runway to seal the second sealing cavity and collect lubricating oil.The sealing effect of the shaft end is good, and the maintenance of the application site can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular, to a shaft end sealing structure. Furthermore, the present application also relates to an aero-engine comprising the shaft end sealing structure. BACKGROUND

[0002] An aero-propeller engine is a gas turbine engine that provides pull or thrust through a propeller. The propeller shaft is one of the important structural components of the aero-propeller engine, which is installed on the aero-engine and connected with the propeller through a bearing, for transmitting the output power of the aero-engine to the propeller and transmitting the torque of the propeller to the aero-engine. In order to ensure the normal operation of the engine, the bearing cavity needs to be fully lubricated, and at the same time, effective sealing of the lubricating oil also needs to be ensured.

[0003] In the prior art, the sealing of the bearing installed on the propeller shaft is generally selected from a lip seal ring inner-skeleton type rubber bowl sealing element or a rubber bowl sealing element without a skeleton. In a free state, the inner diameter of the lip seal ring is smaller than the shaft diameter of the propeller shaft with a certain interference, and after being installed, the pressure of the lip and the contraction force of the self-tightening spring generate a certain holding force on the propeller shaft, and the elastic deformation is achieved to achieve the purpose of sealing. However, during the operation, the temperature and pressure at the bearing position are constantly changing, and the elastic deformation of the lip portion of the sealing element is also inconsistent. The sealing effect is good at the position with large deformation, and the sealing effect is poor at the position with small deformation. At the same time, the inner-skeleton type rubber bowl sealing element itself has uneven adhesion between the skeleton and the rubber, which weakens the bonding force between the rubber bowl and the metal skeleton. Therefore, the sealing performance stability of the existing shaft end sealing element is poor, and the risk of shaft end lubricating oil leakage is high.

[0004] In addition, the rubber bowl sealing element with a skeleton is an integrated structure of rubber material and a skeleton, which does not have a stretching function and cannot be replaced after being damaged. At present, the rubber material selected for the rubber bowl sealing element without a skeleton has insufficient tensile ductility, and it is difficult to restore to the original size after stretching assembly, thereby causing the sealing of the shaft end to be not strict and causing the lubricating oil to leak. In the prior art, there is also a way of cutting a notch in the rubber bowl sealing element without a skeleton for assembly. However, cutting the rubber will cause mechanical damage to the sealing element. During the assembly process, the rubber at the notch of the rubber bowl sealing element will be squeezed and interacted with the edge of the propeller shaft, which will cause the rubber bowl notch to crack and become larger. Under the combined action of stress and lubricating oil medium during high-speed rotation of the propeller shaft, the crack gradually expands until it is cracked. Moreover, under complex application postures, the notch has a risk of oil leakage. Therefore, the rubber bowl sealing element in the prior art is inconvenient to assemble and disassemble, and has a high risk of lubricating oil leakage, resulting in poor maintainability in application places. In addition, the sealing of the shaft end by the rubber bowl sealing element is not strict, which will also cause dust and other foreign matters between the rubber bowl sealing element and the propeller shaft to enter the bearing cavity, thereby accelerating the wear of the rubber bowl sealing element and the propeller shaft and seriously affecting the service life. SUMMARY

[0005] The application provides an axle end sealing structure and an aero-engine to solve the technical problems of poor sealing performance and poor maintainability in the application site of the axle end sealing structure of the aero-engine in the prior art.

[0006] According to an aspect of the application, an axle end sealing structure is provided, which comprises a bearing mounting seat, a rotating shaft rotatably mounted in the bearing mounting seat, a sealing runway in interference fit on the outer wall of the rotating shaft, and a static seal member sleeved on the outer ring of the sealing runway and fixed on the bearing mounting seat,

[0007] The static seal member comprises a sealing oil collecting disc and a sealing mounting seat arranged in sequence along the axial direction of the sealing runway, and a lip-shaped sealing ring in interference fit between the sealing oil collecting disc and the sealing mounting seat, the side of the lip-shaped sealing ring close to the bearing is enclosed with the sealing mounting seat and the sealing runway to form a first sealing cavity, the side of the lip-shaped sealing ring away from the bearing is enclosed with the sealing oil collecting disc and the sealing runway to form a second sealing cavity, the lip-shaped sealing ring is tightly clamped on the outer wall of the sealing runway to seal the first sealing cavity, and the sealing oil collecting disc abuts against the outer wall of the sealing runway to seal the second sealing cavity and collect lubricating oil.

[0008] Further, the lip-shaped sealing ring is integrally formed by fluororubber F370 or rubber 77091.

[0009] Further, the included angle between the inner wall of the side of the lip-shaped sealing ring close to the bearing and the outer wall of the sealing runway is greater than the included angle between the inner wall of the side of the lip-shaped sealing ring away from the bearing and the outer wall of the sealing runway, so as to form a pumping effect in the first sealing cavity.

[0010] Further, an auxiliary sealing structure is arranged on the inner wall of the side of the lip-shaped sealing ring away from the bearing, so that the lubricating oil in the second sealing cavity forms a fluid dynamic pressure effect to enter the first sealing cavity to enhance the pumping effect of the lip-shaped sealing ring.

[0011] The surface of the auxiliary sealing structure is in a spiral shape, a corrugated shape or a triangular rib shape.

[0012] Further, a sealing boss is arranged on the end surface of the lip-shaped sealing ring in contact with the sealing mounting seat, so as to enhance the adhesion with the sealing mounting seat to enhance the sealing effect.

[0013] Further, a sealing adjustment pad is sleeved between the lip-shaped sealing ring and the sealing mounting seat along the axial direction, the two sides of the sealing adjustment pad are respectively in axial abutment with the lip-shaped sealing ring and the sealing mounting seat, so as to enhance the axial sealing effect of the bearing cavity.

[0014] Further, the outer wall of the sealing raceway is provided with an oil blocking tooth in the radial direction, which is arranged in the second sealing cavity to block the leaked lubricating oil from the first sealing cavity, and the two sides of the oil blocking tooth are respectively provided with a first transition step for forming a sealing abutting surface with the sealing oil collecting disc and a second transition step for forming an abutting surface with the lip-shaped sealing ring.

[0015] The outer wall of the sealing raceway near the one end of the bearing is provided with a pulling groove in the radial direction, and the outer wall of the sealing raceway is provided with a chamfered transition surface to avoid damage of the lip-shaped sealing ring during the sleeving process.

[0016] Further, an O-shaped sealing ring is arranged between the sealing raceway and the rotating shaft to prevent the lubricating oil from leaking from the abutting surface between the sealing raceway and the shaft end of the rotating shaft.

[0017] Further, the sealing oil collecting disc comprises an oil collecting disc sleeved on the outer wall of the sealing raceway, a dustproof ring embedded around the inner wall of the oil collecting disc, and an oil collecting adapter disc fixedly installed on the outer wall of the oil collecting disc.

[0018] The dustproof ring is arranged on the side of the second sealing cavity away from the bearing and abuts against the outer wall of the sealing raceway to prevent dust and seal, and the oil collecting disc is provided with an oil collecting pocket in communication with the second sealing cavity to collect the leaked lubricating oil between the lip-shaped sealing ring and the sealing raceway.

[0019] According to another aspect of the present application, an aero-engine using the shaft end sealing structure is also provided.

[0020] The present application has the following advantages:

[0021] The shaft end sealing structure and the aero-engine have the advantages that the static seal is fixedly installed on the bearing mounting seat, the sealing runway is interference fitted on the outer wall of the rotating shaft, the sealing runway rotates synchronously with the rotating shaft to form a dynamic seal, the dynamic seal cooperates with the static seal to realize sealing, the shaft end of the rotating shaft with high rotating speed can be dynamically and stably sealed, the sealing effect is good, the outer peripheral surface of the lip-shaped sealing ring is interference fitted between the sealing mounting seat and the sealing oil collecting disc to form a static sealing interface, the inner wall surface is tightly attached to the sealing runway rotating with the rotating shaft to form a dynamic sealing interface, the leakage of lubricating oil can be effectively limited, and the sealing effect is good, the first sealing cavity close to the bearing is one-stage sealed by the tight attachment of the lip-shaped sealing ring and the sealing runway, the second sealing cavity away from the bearing is two-stage sealed by the contact cooperation of the sealing oil collecting disc and the sealing runway, the two-stage sealing structure can greatly improve the sealing effect of the shaft end, the sealing oil collecting disc can prevent dust and foreign matters from entering the bearing cavity, can prevent the dust and foreign matters from causing abrasion to the sealing runway and the lip-shaped sealing ring during the rotation of the sealing runway with the rotating shaft, can effectively improve the service life of the shaft end sealing structure, the sealing oil collecting disc has the function of collecting the returned oil, can further prevent the leakage of lubricating oil to the outside of the bearing cavity, can reduce the lubricating oil loss, and can prevent the application site from being polluted, the lip-shaped sealing ring has the whole ring structure with excellent ductility and resilience, compared with the structure with a framework in the prior art, the lip-shaped sealing ring can adapt to the complex posture of the shaft end of the rotating shaft, can be smoothly sleeved on the rotating shaft from the outside without a cutout and rebounded to the state of being tightly attached to the rotating shaft, does not affect the sealing effect, is convenient to replace, can realize the maintenance of the application site without removing the rotating shaft, greatly reduces the maintenance cost, can be applied to the shaft end of the rotating shaft with smaller lubricating oil leakage, high rotating speed and harsh working conditions, and meets the sealing requirements of the shaft end with long service life.

[0022] In addition to the objects, features, and advantages described above, the present application has other objects, features, and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application, and assist in the explanation of the application. In the drawings, the same reference numbers represent the same elements throughout the several views of the drawings:

[0024] Figure 1 is a structural schematic view of the shaft end sealing structure of the preferred embodiment of the present application;

[0025] Figure 2 is a structural schematic view of the lip-shaped sealing ring of the shaft end sealing structure of the preferred embodiment of the present application;

[0026] Figure 3This is a schematic diagram of the sealed runway structure of the shaft end sealing structure of the present invention.

[0027] Legend:

[0028] 100. Bearing mounting seat; 200. Rotating shaft; 300. Bearing; 400. Sealing track; 401. Oil baffle tooth; 402. First transition step; 403. Second transition step; 404. Pull-out groove; 405. O-ring seal; 500. Static seal; 501. Sealing oil collection pan; 5011. Oil collection pan; 5012. Dustproof ring; 5013. Oil collection adapter; 502. Sealing mounting seat; 503. Lip seal; 5031. Auxiliary sealing structure; 5032. First boss; 5032. Second boss; 504. Tension spring; 505. Sealing adjusting shim; 600. Locking element; 700. Bearing adjusting shim. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0030] like Figure 1 As shown, the shaft end sealing structure of this embodiment includes a bearing mounting base 100, a rotating shaft 200 rotatably mounted in the bearing mounting base 100, a sealing raceway 400 interference-fitted to the outer wall of the rotating shaft 200, and a static sealing element 500 sleeved on the outer ring of the sealing raceway 400 and fixed to the bearing mounting base 100. A bearing 300 is installed between the rotating shaft 200 and the bearing mounting base 100. The outer ring of the bearing 300 is fixedly connected to the bearing mounting base 100. The inner ring of the bearing 300 and the sealing raceway 400 are axially locked to the journal of the rotating shaft 200 by a locking element 600 to stably limit the axial movement of the sealing raceway 400 and the inner ring of the bearing 300. Therefore, by fixing the static seal 500 on the bearing mounting seat 100 and interference-fitting the sealing raceway 400 on the outer wall of the rotating shaft 200, the sealing raceway 400 rotates synchronously with the rotating shaft 200 to form a dynamic seal. The bearing cavity is sealed by the movable cooperation between the dynamic seal and the static seal 500. This provides a dynamic and stable seal for the shaft end of the high-speed rotating shaft 200, resulting in a good sealing effect.

[0031] The static seal 500 comprises a sealing oil collecting disc 501 and a sealing mounting seat 502 arranged along the axial direction of the sealing raceway 400 in sequence, and a lip-shaped sealing ring 503 interference-fitted between the sealing oil collecting disc 501 and the sealing mounting seat 502. The side of the lip-shaped sealing ring 503 close to the bearing 300 is enclosed by the sealing mounting seat 502 and the sealing raceway 400 to form a first sealing cavity. The outer circumferential surface of the lip-shaped sealing ring 503 is interference-fitted with the sealing mounting seat 502 and the sealing oil collecting disc 501 to form a static sealing interface, and the inner wall surface is tightly attached to the sealing raceway 400 rotating with the rotating shaft 200 to form a first dynamic sealing interface. Thus, the first sealing cavity is combined with the static sealing interface and the first dynamic sealing interface to perform primary sealing on the bearing cavity, which can effectively limit the leakage of lubricating oil and has good sealing effect. The side of the lip-shaped sealing ring 503 away from the bearing 300 is enclosed by the sealing oil collecting disc 501 and the sealing raceway 400 to form a second sealing cavity. The outer wall of the sealing oil collecting disc 501 is tightly attached to the sealing raceway 400 to form a second dynamic sealing interface. Thus, the second sealing cavity is combined with the second dynamic sealing interface to perform secondary sealing on the bearing cavity. Thus, the combination of the two-stage sealing structure design can greatly improve the sealing effect of the shaft end. At the same time, the sealing oil collecting disc 501 can prevent dust and foreign matter from entering the bearing cavity, prevent dust and foreign matter from causing wear of the sealing raceway 400 and the lip-shaped sealing ring 503 during the rotation of the sealing raceway 400 with the rotating shaft 200, effectively improve the service life of the shaft end sealing structure, and the sealing oil collecting disc 501 has the function of collecting oil, which can further prevent the leakage of lubricating oil to the outside of the bearing cavity, reduce the loss of lubricating oil, and prevent pollution of the application site. Preferably, the sealing oil collecting disc 501 is fixedly connected with the sealing mounting seat 502 through screws, and the sealing mounting seat 502 is fixedly connected with the bearing mounting seat 100 through a connecting pin. Preferably, a bearing adjusting pad 700 is sleeved between the bearing mounting seat 100 and the bearing 300 along the axial direction, and the bearing adjusting pad 700 is arranged on the side of the bearing 300 away from the sealing mounting seat 502, and the outer ring of the bearing 300 is axially limited by the bearing adjusting pad 700.

[0032] Specifically, when the lip seal ring 503 reaches the service life but other components are still within the life cycle, and the lip seal ring 503 needs to be replaced at the application site, the screws are removed to loosen the seal oil pan 501 from the rotating shaft 200, the seal oil pan 501 is placed at a suitable position of the rotating shaft 200, and then the original lip seal ring 503 is removed from the rotating shaft 200; then the flange at the shaft end of the rotating shaft 200 is protected by wrapping and other measures to prevent it from scratching the lip of the lip seal ring 503; then the new lip seal ring 503 is stretched radially, and it is sequentially sleeved on the outer wall of the seal track 400 after passing through the flange of the rotating shaft 200 and the seal oil pan 501, and then the lip seal ring 503 is installed in the seal mounting seat 502 after the lip seal ring 503 rebounds to the initial size and tightly fits the outer wall of the seal track 400; the seal oil pan 501 is moved towards the seal mounting seat 502, and the outer periphery of the lip seal ring 503 is installed in the seal mounting seat 502; finally, the seal oil pan 501 is fixed to the seal mounting seat 502 by screws, and the replacement of the lip seal ring 503 at the application site is completed. The lip seal ring 503 has excellent extension and rebound performance, and compared with the existing technology with a skeleton structure, it can not only adapt to the complex posture of the shaft end of the rotating shaft 200, but also can be smoothly sleeved on the rotating shaft 200 from the outside without cutting and rebounding to tightly fit the rotating shaft 200 without affecting the sealing effect, facilitating replacement, and realizing the maintenance of the application site without disassembling the rotating shaft 200, greatly reducing the maintenance cost, and being applicable to the shaft end of the rotating shaft 200 under small oil leakage, high speed and harsh working conditions, meeting the shaft end sealing requirements of long service life.

[0033] Preferably, the static seal 500 further comprises a tension spring 504, and specifically, an annular positioning groove is arranged in the lip seal ring 503, the annular positioning groove is arranged at one end of the lip seal ring 503 close to the bearing 300 and matched with the tension spring 504 to axially position the tension spring 504, and the tension spring 504 is installed in the annular positioning groove to clamp the lip seal ring 503 on the outer wall of the seal track 400, so as to enhance the radial fit between the lip seal ring 503 and the seal track 400 and enhance the sealing effect. Preferably, the tension spring 504 is detachably installed in the annular positioning groove, and when the lip seal ring 503 needs to be replaced, the tension spring 504 can be removed first, and then the installation of the tension spring 504 is performed after the assembly of the lip seal ring 503 is completed, so as to avoid affecting the maintenance of the shaft end sealing structure at the application site.

[0034] In this embodiment, the lip-shaped sealing ring 503 is integrally formed by fluororubber F370 or rubber 77091, which has good ductility and excellent compatibility with the medium. It can not only adapt to the transient radial deformation of the rotating shaft 200 and the sealing track 400 or the eccentric movement of the rotating shaft 200 without increasing the sealing gap, but also has good resilience. After being assembled to the rotating shaft 200, it can restore to the original size, and the sealing performance does not change. When the lip-shaped sealing ring 503 needs to be replaced, it can be directly removed from the rotating shaft 200, and then the new lip-shaped sealing ring 503 is sleeved on the rotating shaft 200 by relying on its own elasticity. The lip-shaped sealing ring 503 can be restored to the initial size on the rotating shaft 200 until it is tightly fitted with the rotating shaft 200, so that the lip-shaped sealing ring 503 can be installed and removed without disassembling the rotating shaft 200, and maintenance can be realized in the application site.

[0035] As shown in Figure 1 , the sealing mounting seat 502 is fixed on the bearing mounting seat 100, the outer wall of the lip-shaped sealing ring 503 is in interference fit with the sealing mounting seat 502 to form a static sealing interface to statically seal the bearing cavity, and the inner wall of the lip-shaped sealing ring 503 is tightly fitted with the sealing track 400 to form a first dynamic sealing interface, so that it cooperates with the sealing track 400 rotating with the rotating shaft 200 to actively seal the bearing cavity. When the rotating shaft 200 rotates, the inner wall of the lip-shaped sealing ring 503 is subjected to shearing force to cause tangential deformation to guide the flow of lubricating oil, and the lubricating oil on both sides flows to the middle. The lip-shaped sealing ring 503 is arranged between the first sealing cavity and the second sealing cavity, and the angle α between the side close to the bearing 300 and the axis of the rotating shaft 200 is greater than the angle β between the side away from the bearing 300 and the axis of the rotating shaft 200 on the inner wall of the lip-shaped sealing ring 503 in contact with the sealing track 400, so that the maximum contact pressure between the lip-shaped sealing ring 503 and the sealing track 400 is located on the side of the lip-shaped sealing ring 503 away from the first sealing cavity. When the rotating shaft 200 rotates, the maximum tangential deformation of the lip-shaped sealing ring 503 coincides with the position of the maximum contact pressure, so that the net flow of lubricating oil from the second sealing cavity to the first sealing cavity is greater than the flow of lubricating oil from the first sealing cavity to the second sealing cavity, thereby forming a pumping effect of the first sealing cavity on the lubricating oil in the second sealing cavity to flow into the bearing cavity through the pumping effect, greatly enhancing the sealing effect of the lip-shaped sealing ring 503.

[0036] As shown in Figure 1 and Figure 2As shown in the drawings, the inner wall of the lip-shaped sealing ring 503 away from the bearing 300 is provided with an auxiliary sealing structure 5031, the surface of the auxiliary sealing structure 5031 is molded into a spiral, corrugated or triangular rib shape which can form a hydrodynamic pressure effect, for guiding the fluid in the second sealing cavity to flow towards the direction of the first sealing cavity, thereby assisting the pumping action of the lip-shaped sealing ring 503 and enhancing the sealing effect, greatly reducing the leakage of lubricating oil, and being more suitable for the sealing of the rotating shaft 200 under high speed and harsh working conditions.

[0037] As shown in the drawings, Figure 1 and Figure 2 the end face of the lip-shaped sealing ring 503 in contact with the sealing mounting seat 502 is provided with a sealing boss, which includes a first boss 5032 and a second boss 5032, the first boss 5032 is arranged on the outer wall of the lip-shaped sealing ring 503 in the radial direction, for strengthening the radial fit with the sealing mounting seat 502; the second boss 5032 is arranged on the end face of the lip-shaped sealing ring 503 close to the bearing 300 in the axial direction, for strengthening the axial fit with the sealing mounting seat 502; thereby, the first boss 5032 and the second boss 5032 are combined with the sealing mounting seat 502 to form a radial static sealing interface and an axial static sealing interface, respectively, to limit the leakage of lubricating oil and enhance the sealing effect. Preferably, a plurality of first bosses 5032 are arranged along the axial direction of the lip-shaped sealing ring 503; a plurality of second bosses 5032 are arranged along the radial direction of the lip-shaped sealing ring 503.

[0038] As shown in the drawings, Figure 1 the rubber material used for the lip-shaped sealing ring 503 has good ductility, so its dimensional tolerance is large. The outer wall of the lip-shaped sealing ring 503 is interference fitted in the sealing mounting seat 502 to ensure its radial sealing effect, and a sealing adjusting pad 505 is axially sleeved between the lip-shaped sealing ring 503 and the sealing mounting seat 502, the axial thickness of the sealing adjusting pad 505 is determined by size chain calculation, so that the two sides of the sealing adjusting pad 505 are axially abutted with the lip-shaped sealing ring 503 and the sealing mounting seat 502 respectively, to strictly control the axial sealing effect of the lip-shaped sealing ring 503.

[0039] As shown in the drawings, Figure 1 and Figure 3As shown, the sealing track 400 comprises a first annular portion and a second annular portion which are spaced along the radial direction of the rotating shaft 200 and are sleeved on the outer wall of the rotating shaft 200, the first annular portion is arranged at one end close to the bearing 300 and is sleeved on the outer wall of the rotating shaft 200 in an interference fit, and the two ends of the first annular portion abut against the inner ring of the bearing 300 and the journal of the rotating shaft 200 respectively, so as to realize the axial positioning on the rotating shaft 200; the second annular portion has a gap with the rotating shaft 200, and the outer wall of the second annular portion is provided with oil blocking teeth 401 in the radial direction, the oil blocking teeth 401 are arranged in the second sealing cavity, on one hand, the lip-shaped sealing ring 503 has elasticity and may be deformed to a certain extent during the start and stop of the rotating shaft 200, so that part of the lubricating oil may leak from between the lip-shaped sealing ring 503 and the sealing track 400, the arrangement of the oil blocking teeth 401 can block the lubricating oil in the first sealing cavity from leaking between the lip-shaped sealing ring 503 and the sealing track 400, prevent the lubricating oil from flowing to the application site, and strengthen the sealing effect of the bearing cavity; on the other hand, the tooth tips of the oil blocking teeth 401 are arranged in the direction of the sealing oil collecting disc 501, can guide the leaked lubricating oil to flow into the sealing oil collecting disc 501 for collection, and avoid the lubricating oil from flowing to the application site to cause pollution. Preferably, in the embodiment, the oil blocking teeth 401 are straight teeth, and the center line thereof is perpendicular to the axial direction of the rotating shaft 200; alternatively, the oil blocking teeth 401 can also be arranged in the form of helical teeth at a certain angle with the rotating shaft 200. Alternatively, the oil blocking teeth 401 are provided with helical external threads, the rotation direction of the external threads is towards the first sealing cavity, so that the sealing track 400 can push the lubricating oil into the bearing cavity in the direction of the first sealing cavity when the sealing track 400 actually rotates with the rotating shaft 200, so as to reduce the consumption of lubricating oil. Alternatively, the oil blocking teeth 401 are arranged in the axial direction of the sealing track 400.

[0040] As shown in the figure, Figure 3 The outer wall of the second annular portion of the sealing track 400 is sequentially and spacedly provided with a first transition step 402 and a second transition step 403 in the axial direction, the first transition step 402 is arranged at one side of the oil blocking teeth 401 close to the sealing oil collecting disc 501, is used to form a sealing fit surface with the inner wall of the sealing oil collecting disc 501 to strengthen the axial sealing effect of the sealing oil collecting disc 501, and the second transition step 403 is arranged at one side of the oil blocking teeth 401 away from the sealing oil collecting disc 501, is used to form an abutting surface with the lip-shaped sealing ring 503 to strengthen the axial sealing effect of the lip-shaped sealing ring 503.

[0041] The outer wall of the first annular part of the sealing raceway 400 is provided with a pulling groove 404 in the radial direction to facilitate the disassembly of the sealing raceway 400 in the application site. Preferably, the outer wall of the first annular part and the second annular part are both provided with a chamfered transition surface at the end of the first annular part and the second annular part to avoid mechanical damage to the lip of the lip-shaped sealing ring 503 during the sleeving process, facilitating the assembly of the lip-shaped sealing ring 503. Preferably, the chamfered transition surface is a rounded chamfer; alternatively, the chamfered transition surface is a beveled angle.

[0042] Preferably, the position of the outer wall of the second annular part of the sealing raceway 400 in contact with the lip-shaped sealing ring 503 is provided with an annular wear-resistant coating to strengthen the contact hardness of the sealing raceway 400, reduce the wear caused by the friction between the sealing raceway 400 and the lip-shaped sealing ring 503 during the rotation of the rotating shaft 200, enhance the wear resistance, and effectively improve the service life of the sealing raceway 400. Preferably, the wear-resistant coating is a chromium carbide coating or a nickel plating coating. Alternatively, the position of the outer wall of the second annular part of the sealing raceway 400 in contact with the sealing oil collection disc 501 is also provided with an annular wear-resistant coating.

[0043] As shown in Figure 1 and Figure 3 , the inner wall of the first annular part of the sealing raceway 400 is provided with a chamfered transition surface near one end of the journal of the rotating shaft 200 to facilitate the interference assembly of the first annular part of the sealing raceway 400 on the rotating shaft 200, avoid mechanical damage to the sealing raceway 400 during assembly, and ensure the sealing effect. Thus, the end of the first annular part near the journal of the rotating shaft 200 forms a cavity with the rotating shaft 200, and an O-shaped sealing ring 405 is arranged in the cavity, so that the O-shaped sealing ring 405 is tightly attached to the outer wall of the rotating shaft 200 and the inner wall of the sealing raceway 400 to prevent oil leakage from the contact surface between the sealing raceway 400 and the journal and the inner wall of the rotating shaft 200.

[0044] As shown in Figure 1As shown, the sealing oil collecting disc 501 comprises an oil collecting disc 5011 sleeved on the outer wall of the sealing raceway 400, a dustproof ring 5012 embedded around the inner wall of the oil collecting disc 5011, and an oil collecting adapter disc 5013 fixedly installed on the outer wall of the oil collecting disc 5011. The dustproof ring 5012 is arranged on the side of the second sealing cavity away from the bearing 300, tightly abuts the outer wall of the sealing raceway 400 to form a second dynamic sealing interface, and is used for blocking dust and other foreign matters in the application site. In combination with the first dynamic sealing interface, the bearing cavity is sealed to prevent the lubricating oil from flowing out of the second sealing cavity, and the sealing effect is greatly improved. Specifically, the dustproof ring 5012 is in clearance fit with the sealing raceway 400. Preferably, the dustproof ring 5012 is a graphite ring, or the contact surface of the dustproof ring 5012 and the sealing raceway 400 is provided with a graphite coating or a honeycomb structure. The flexible honeycomb or graphite coating is wear-resistant, can ensure good sealing performance, and effectively blocks dust or foreign matters in the outside from entering the bearing cavity, thereby avoiding that the dust or foreign matters cause wear of the lip-shaped sealing ring 503 or the sealing raceway 400 when the rotating shaft 200 rotates at high speed, and improving the service life of the shaft end sealing structure.

[0045] The oil collecting disc 5011 is provided with an oil collecting hole in communication with the second sealing cavity, which is used for guiding the lubricating oil between the lip-shaped sealing ring 503 and the sealing raceway 400. The oil collecting disc 5011 is provided with an oil collecting pocket in communication with the oil collecting hole, which is used for containing the lubricating oil entering from the oil collecting hole, so as to realize collection of the lubricating oil. The oil collecting adapter disc 5013 is connected with the oil collecting pocket, and is used for adapting the lubricating oil in the oil collecting pocket, so as to avoid that the lubricating oil flows to the application site to cause pollution. Preferably, an annular sealing ring is arranged between the oil collecting adapter disc 5013 and the oil collecting disc 5011 to seal the oil collecting disc 5011, so as to prevent the lubricating oil from leaking between the oil collecting disc 5011 and the oil collecting adapter disc 5013, and further avoid that the lubricating oil flows to the application site to cause pollution.

[0046] In addition, the application further discloses an aero-engine comprising the shaft end sealing structure.

[0047] The above merely describes the preferred embodiments of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A shaft end sealing structure, characterized in that, it comprises a bearing mounting seat (100), a rotating shaft (200) rotatably mounted in the bearing mounting seat (100), a sealing track (400) which is interference-fitted on the outer wall of the rotating shaft (200), and a static seal (500) which is sleeved on the outer ring of the sealing track (400) and is fixed on the bearing mounting seat (100), the static seal (500) comprises a sealing oil collecting disc (501) and a sealing mounting seat (502) which are sequentially arranged along the axial direction of the sealing track (400), and a lip-shaped sealing ring (503) which is interference-fitted between the sealing oil collecting disc (501) and the sealing mounting seat (502), the side of the lip-shaped sealing ring (503) close to the bearing (300) and the sealing mounting seat (502) and the sealing track (400) form a first sealing cavity, the side of the lip-shaped sealing ring (503) away from the bearing (300) and the sealing oil collecting disc (501) and the sealing track (400) form a second sealing cavity, the lip-shaped sealing ring (503) is clamped on the outer wall of the sealing track (400) to seal the first sealing cavity, and the sealing oil collecting disc (501) abuts against the outer wall of the sealing track (400) to seal the second sealing cavity and collect lubricating oil; the sealing track (400) comprises a first annular part and a second annular part which are spaced apart along the radial direction of the rotating shaft (200) and are sleeved on the outer circumference of the rotating shaft (200), the first annular part is arranged at one end close to the bearing (300) and is interference-fitted on the outer wall of the rotating shaft (200), and the two ends thereof abut against the inner ring of the bearing (300) and the journal of the rotating shaft (200) respectively to realize axial positioning on the rotating shaft (200); the second annular part has a gap with the rotating shaft (200), and the outer wall of the second annular part is provided with oil blocking teeth (401) in the radial direction, and the oil blocking teeth (401) are arranged in the second sealing cavity to block the lubricating oil leaked from the first sealing cavity.

2. The shaft end sealing structure according to claim 1, characterized in that, the lip-shaped sealing ring (503) is integrally formed by using fluororubber F370 or rubber 77091.

3. The shaft end sealing structure according to claim 1, characterized in that, the included angle between the inner wall of the side of the lip-shaped sealing ring (503) close to the bearing (300) and the outer wall of the sealing track (400) is greater than the included angle between the inner wall of the side of the lip-shaped sealing ring (503) away from the bearing (300) and the outer wall of the sealing track (400), so as to form a pumping effect in the first sealing cavity.

4. The shaft end sealing structure according to claim 3, characterized in that, An auxiliary sealing structure (5031) is arranged on the inner wall of the lip-shaped sealing ring (503) away from the bearing (300) to make the oil in the second sealing cavity form a fluid dynamic pressure effect into the first sealing cavity to enhance the pumping effect of the lip-shaped sealing ring (503). The surface of the auxiliary sealing structure (5031) is in a spiral shape, a corrugated shape or a triangular rib shape.

5. The shaft end sealing structure according to claim 1, wherein A sealing boss is arranged on the end face of the lip-shaped sealing ring (503) in contact with the sealing mounting seat (502) to strengthen the fit with the sealing mounting seat (502) and enhance the sealing effect.

6. The shaft end sealing structure according to claim 1, wherein A sealing adjustment pad (505) is axially sleeved between the lip-shaped sealing ring (503) and the sealing mounting seat (502), and the two sides of the sealing adjustment pad (505) are respectively in axial abutment with the lip-shaped sealing ring (503) and the sealing mounting seat (502) to strengthen the axial sealing effect on the bearing cavity.

7. The shaft end sealing structure according to claim 1, wherein First transition steps (402) for forming a sealing fit surface with the sealing oil collection disc (501) and second transition steps (403) for forming an abutment surface with the lip-shaped sealing ring (503) are respectively arranged on the two sides of the oil blocking teeth (401); A pull-out groove (404) is radially arranged on the outer wall of the sealing runway (400) near one end of the bearing (300), and the outer wall of the sealing runway (400) is provided with a chamfered transition surface to avoid damage to the lip-shaped sealing ring (503) during sleeving.

8. The shaft end sealing structure according to claim 1, wherein An O-shaped sealing ring (405) is arranged between the sealing runway (400) and the rotating shaft (200) to prevent oil leakage from the fit surface between the sealing runway (400) and the shaft end of the rotating shaft (200).

9. The shaft end sealing structure according to claim 1, wherein The sealing oil collection disc (501) comprises an oil collection disc (5011) sleeved on the outer wall of the sealing runway (400), a dustproof ring (5012) embedded on the inner wall of the oil collection disc (5011), and an oil collection adapter disc (5013) fixedly installed on the outer wall of the oil collection disc (5011); The dustproof ring (5012) is arranged on the side of the second sealing cavity away from the bearing (300) and abuts against the outer wall of the sealing runway (400) to prevent dust and seal, and the oil collection disc (5011) is internally provided with an oil collection pocket in communication with the second sealing cavity to collect leaked oil between the lip-shaped sealing ring (503) and the sealing runway (400).

10. An aeroengine characterised in that, The shaft end sealing structure according to any one of claims 1 to 9.

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