CN118855998A - Double lip seals, accessories, transmissions and aircraft engines - Google Patents

Abstract

The invention discloses a double-lip sealing accessory transmission device and an aeroengine, wherein the double-lip sealing accessory transmission device comprises a rotor, a bearing seat and a double-lip oil seal, wherein an inner ring of the bearing is arranged on the rotor, an outer ring of the bearing is arranged on the bearing seat, and the double-lip oil seal is used for sealing a gap between the rotor and the bearing seat; the double-lip oil seal comprises a sealing ring and a sealing ring, and two sealing lips arranged along the axial direction of the rotor at intervals, wherein one face of the sealing ring, facing the bearing seat, is provided with a sealing groove, the sealing ring is embedded in the sealing groove and is elastically abutted against the inner wall surface of the bearing seat, the two sealing lips are all arranged on the face, facing the rotor, of the sealing ring and are elastically abutted against the outer peripheral wall of the rotor, and one end, far away from the sealing ring, of the sealing lips is bent along the direction facing the other sealing lip. The double-lip oil seal in the double-lip seal accessory transmission device provided by the invention can realize a bidirectional sealing effect, effectively simplify a sealing structure, adapt to a high linear speed working condition and improve the stability of a rotor.

Description

Double lip seals, accessories, transmissions and aircraft engines

Technical Field

The present invention relates to the technical field of aircraft engine accessory transmission, in particular to a double-lip seal accessory transmission device and an aircraft engine using the double-lip seal accessory transmission device.

Background Art

As shown in FIG1 , in an aircraft engine, the transmission of the accessory gearbox is realized through the rotor, so a bearing cavity and an accessory cavity are respectively provided along the axial direction of the rotor. Since a traditional leather cup oil seal can only seal lubricating oil on one side, two leather cup oil seals need to be provided on the bearing seat to respectively seal the bearing cavity and the accessory cavity, which not only leads to a complicated transmission structure and increases the length of the rotor, but also the traditional leather cup oil seal is made of rubber material, which can adapt to low linear speeds, and the lip is prone to high temperature rupture, and the weight is large, which will also affect the overall weight and the dynamic characteristics of the rotor.

Summary of the invention

The present invention primarily provides a double-lip seal accessory transmission device to solve the technical problem that the rotor seal of the existing aircraft engine needs to be provided with multiple oil seals, which leads to a complex structure, increases the length and weight, and affects the dynamic characteristics of the rotor.

The present invention also provides an aircraft engine, which adopts the double-lip seal accessory transmission device.

According to one aspect of the present invention, there is provided a double-lip seal accessory transmission device, comprising a rotor, a bearing, a bearing seat and a double-lip oil seal, wherein the inner ring of the bearing is mounted on the rotor, the outer ring of the bearing is mounted on the bearing seat, and the double-lip oil seal is arranged on one side of the bearing and is used to seal the gap between the rotor and the bearing seat;

The double-lip oil seal includes a sealing ring and a sealing ring, and two sealing lips arranged at intervals along the axial direction of the rotor. The sealing ring is sleeved between the rotor and the bearing seat. A sealing groove is provided on a side of the sealing ring facing the bearing seat. The sealing ring is embedded in the sealing groove and elastically abuts against the inner wall surface of the bearing seat. Both sealing lips are arranged on a side of the sealing ring facing the rotor and elastically abut against the outer peripheral wall of the rotor. One end of the sealing lip away from the sealing ring is bent in a direction toward the other sealing lip.

Preferably, two sealing rings are provided at intervals along the axial direction of the sealing ring, a first oil inlet channel is provided at a position between the two sealing rings corresponding to the bearing seat, a second oil inlet channel is provided at a position between the two sealing rings corresponding to the bearing seat, and two sealing lips are enclosed between the sealing ring and the rotor to form a lubricating oil cavity, the first oil inlet channel is used to transport lubricating oil from the outer periphery of the bearing seat to the second oil inlet channel, and the second oil inlet channel is used to transport lubricating oil to the lubricating oil cavity and lubricate and cool the two sealing lips.

Preferably, the end of the rotor extends axially and protrudes from the double-lip oil seal and is used to be set in the accessory cavity. The rotor is provided with an oil inlet hole connected to the lubricating oil cavity along its radial direction, and the end of the rotor is provided with an oil throwing hole connected to the oil inlet hole. The oil inlet hole is used to discharge the lubricating oil in the lubricating oil cavity to the oil throwing hole, and the oil throwing hole is used to throw the lubricating oil into the accessory cavity during the rotation of the rotor.

Preferably, one end of the second oil inlet passage connected to the lubricating oil chamber is located in the middle section of the lubricating oil chamber and is inclined toward the end of the rotor.

Preferably, the interior of the rotor is provided with a first oil storage chamber and a second oil storage chamber at intervals along the axial direction, and an oil drain hole connecting the first oil storage chamber and the second oil storage chamber. The first oil storage chamber is arranged at a position corresponding to the lubricating oil chamber and is connected to the oil inlet hole. The second oil storage chamber is arranged at the end of the rotor. A plurality of oil-slinging holes are arranged at intervals along the circumference of the rotor, and the plurality of oil-slinging holes are respectively connected to the second oil storage chamber.

Preferably, a cache groove is provided at a position between two sealing rings corresponding to the sealing ring, and the cache groove is used to enclose with the bearing seat to form a cache cavity, and the first oil inlet channel and the second oil inlet channel are respectively connected to the cache cavity.

Preferably, the double-lip oil seal also includes a support frame mounted on the sealing ring and made of self-lubricating material, the support frame being provided with an arcuate support surface adapted to the shape of the sealing lip, the arcuate support surface being used to support one side of the sealing lip away from the other sealing lip.

Preferably, the support frame is set to a circular ring structure, the outer diameter of the support frame is larger than the inner diameter of the sealing ring corresponding to the installation position of the support frame, and a notch is opened on the support frame so that the support frame can be elastically tightened along its circumference.

Preferably, the surface of the rotor is sprayed with a wear-resistant coating.

According to a second aspect of the present invention, there is also provided an aircraft engine comprising the above-mentioned double lip seal accessory transmission device.

The present invention has the following beneficial effects:

In the double-lip seal accessory transmission device provided by the present invention, the double-lip oil seal is sealed with the inner wall of the bearing seat through the sealing ring, and is sealed with the outer peripheral wall of the rotor through the sealing lip. Since two sealing lips are arranged at intervals along the axial direction, and the end of the sealing lip away from the sealing ring is bent in the direction toward the other sealing lip, the two sealing lips can be respectively adapted to the lubricating oil seal in two directions, thereby realizing a bidirectional sealing effect. The sealing of two cavities can be achieved by using a double-lip oil seal, which effectively simplifies the sealing structure. Secondly, the two sealing lips are supported and fixed by the sealing ring at the same time, which improves the position accuracy of the two sealing lips and can also set the sealing lips closer to the rotor, reducing the height of the sealing lips and the resistance to the rotor, so that the sealing lips can adapt to high linear speed conditions and improve the stability of the rotor.

In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

FIG1 is a schematic structural diagram of an accessory transmission device of a conventional aircraft engine;

FIG2 is a schematic structural diagram of a double-lip seal accessory transmission device provided by an embodiment of the present invention;

FIG3 is a schematic diagram of the structure of a double-lip oil seal in the double-lip seal accessory transmission device shown in FIG1 ;

FIG4 is a schematic diagram of the structure of the support frame in the double-lip oil seal shown in FIG3 ;

FIG. 5 is a radial cross-sectional view of the support frame shown in FIG. 4 .

Legend:

1. Rotor; 11. Oil inlet hole; 12. Oil throwing hole; 13. First oil storage chamber; 14. Second oil storage chamber; 15. Oil drain hole; 2. Bearing; 3. Bearing seat; 31. First oil inlet channel; 4. Double-lip oil seal; 41. Sealing ring; 411. Sealing groove; 412. Second oil inlet channel; 413. Buffer groove; 42. Sealing ring; 43. Sealing lip; 44. Support frame; 441. Arc-shaped support surface; 442. Notch; 100. Accessory chamber.

DETAILED DESCRIPTION

The embodiments of the present invention are 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.

Figures 2 to 5 collectively show a double-lip seal accessory transmission device provided in an embodiment of the present invention, which is used to be arranged in an aircraft engine to realize the transmission of an accessory gearbox. Since the sealing structure is simple and efficient and occupies a small space, it can ensure the sealing effect while being beneficial to increasing the linear speed and stability of the rotor, thereby improving the transmission effect.

Please refer to Figures 2 and 3. The double-lip seal accessory transmission device includes a rotor 1, a bearing 2, a bearing seat 3 and a double-lip oil seal 4. The inner ring of the bearing 2 is mounted on the rotor 1, and the outer ring of the bearing 2 is mounted on the bearing seat 3. The double-lip oil seal 4 is arranged on one side of the bearing 2 and is used to seal the gap between the rotor 1 and the bearing seat 3. Specifically, the bearing 2 is arranged in the bearing cavity, and the end of the rotor 1 extends axially and protrudes from the double-lip oil seal 4 and is used to be arranged in the accessory cavity 100. The bearing cavity and the accessory cavity 100 are both used to inject lubricating oil, and the bearing cavity and the accessory cavity 100 are respectively sealed by the double-lip oil seal 4.

Preferably, the double-lip oil seal 4 includes a sealing ring 41 and a sealing ring 42, and two sealing lips 43 arranged at intervals along the axial direction of the rotor 1, the sealing ring 41 is sleeved between the rotor 1 and the bearing seat 3, the sealing ring 41 is provided with a sealing groove 411 on a side facing the bearing seat 3, the sealing ring 42 is embedded in the sealing groove 411, a part of the structure of the sealing ring 42 protrudes from the sealing groove 411 and elastically abuts against the inner wall surface of the bearing seat 3, two sealing lips 43 are both provided on a side of the sealing ring 41 facing the rotor 1 and elastically abut against the outer peripheral wall of the rotor 1, and one end of the sealing lip 43 away from the sealing ring 41 is bent in a direction toward the other sealing lip 43.

In the double-lip seal accessory transmission device, the double-lip oil seal 4 is sealed with the inner wall of the bearing seat 3 through the sealing ring 42, and is sealed with the outer peripheral wall of the rotor 1 through the sealing lip 43. Since two sealing lips 43 are arranged at intervals along the axial direction, and the end of the sealing lip 43 away from the sealing ring 41 is bent in the direction toward the other sealing lip 43, the two sealing lips 43 can be respectively adapted to the lubricating oil seal in two directions, thereby achieving a bidirectional sealing effect. The use of a double-lip oil seal 4 can achieve the sealing of two cavities, effectively simplifying the sealing structure. Secondly, the two sealing lips 43 are supported and fixed by the sealing ring 41 at the same time, and the position accuracy of the two sealing lips 43 is improved. At the same time, the sealing lips 43 can be set closer to the rotor 1, reducing the height of the sealing lips 43 and the resistance to the rotor 1, so that the sealing lips 43 can adapt to high linear speed conditions, thereby improving the linear speed and stability of the rotor.

Furthermore, the sealing ring 41 is made of PTFE (polytetrafluoroethylene) material, so as to have excellent heat resistance and cold resistance, can be used for a long time in an environment of -180 to 260°C, and has an extremely low friction coefficient, which can achieve a sealing effect while reducing friction resistance.

Furthermore, the sealing lip 43 and the sealing ring 41 are integrally formed, that is, the sealing lip 43 is also made of PTFE material, which improves the connection strength and stability between the sealing lip 43 and the sealing ring 41 and reduces the friction resistance of the sealing ring 41.

Preferably, two sealing rings 42 are provided at intervals along the axial direction of the sealing ring 41, the bearing seat 3 is provided with a first oil inlet channel 31 at a position corresponding to the position between the two sealing rings 42, the sealing ring 41 is provided with a second oil inlet channel 412 at a position corresponding to the position between the two sealing rings 42, and two sealing lips 43 enclose a lubricating oil cavity between the sealing ring 41 and the rotor 1.

Specifically, the oil inlet end of the first oil inlet channel 31 is arranged on the outer periphery of the bearing seat 3, the oil outlet end of the first oil inlet channel 31 is connected to the oil inlet end of the second oil inlet channel 412, and the oil outlet end of the second oil inlet channel 412 is connected to the lubricating oil cavity. The first oil inlet channel 31 is used to transport lubricating oil from the outer periphery of the bearing seat 3 to the second oil inlet channel 412, and the second oil inlet channel 412 is used to transport the lubricating oil transported from the first oil inlet channel 31 to the lubricating oil cavity, so as to lubricate and cool the two sealing lips 43 by the lubricating oil.

By setting the first oil inlet channel 31 on the bearing seat 3 and the second oil inlet channel 412 on the sealing ring 41, the lubricating oil can enter the space between the two sealing lips 43, which can not only lubricate and cool the sealing lips 43 and improve the use effect and service life of the sealing lips 43, but also provide lubricating oil pressure for the inner side of the sealing lips 43, so as to balance the pressure on the sealing lips 43 on the opposite sides thereof, and avoid excessive lubricating oil pressure in the bearing cavity or the accessory cavity, which may cause the sealing lips 43 to be squeezed and deformed and affect the sealing effect.

Preferably, the rotor 1 is provided with an oil inlet hole 11 connected to the lubricating oil chamber along its radial direction, and an oil throwing hole 12 connected to the oil inlet hole 11 is provided at the end of the rotor 1. The oil inlet hole 11 is used to discharge the lubricating oil in the lubricating oil chamber to the oil throwing hole 12, and the oil throwing hole 12 is used to throw the lubricating oil into the accessory chamber 100 during the rotation of the rotor 1.

Please refer to Figure 1. In a traditional accessory transmission device, lubricating oil is generally provided to the accessory cavity through the central shaft hole of the rotor. The lubricating oil needs to pass through one end of the rotor to the other end of the rotor to enter the accessory cavity, resulting in an oil path that is too long, poor lubrication effect, and sensitivity to posture changes. The central shaft hole that passes through the rotor will also reduce the strength of the rotor, making it difficult to meet the high strength requirements of the rotor.

In this embodiment, the lubricating oil chamber is provided with lubricating oil by forming an oil inlet passage for the cooperation of the bearing seat 3 and the sealing ring 41, which can not only lubricate and cool the sealing lip 43 and balance the pressure on the sealing lip 43, but also directly provide lubricating oil to the position of the rotor 1 near its end through the lubricating oil chamber, so that the lubricating oil can quickly enter the accessory chamber 100, effectively shorten the oil circuit, improve the lubrication effect of the accessory chamber 100, and there is no need to set a central axis hole that passes through the rotor 1 axially, which is conducive to improving the structural strength of the rotor 1 and meeting higher usage requirements. Secondly, the centrifugal force brought by the self-rotation of the rotor 1 can also be used to drive the lubricating oil to be thrown out to the accessory chamber 100 along the oil throwing hole 12, so as to realize the uniform spraying operation of the lubricating oil in the accessory chamber 100 and improve the lubrication and cooling effect of the accessory chamber 100.

Preferably, the end of the second oil inlet channel 412 connected to the lubricating oil chamber is located in the middle of the lubricating oil chamber and is tilted toward the end of the rotor 1, that is, the end of the second oil inlet channel 412 connected to the lubricating oil chamber is tilted toward the accessory chamber 100, so that the cooling and lubrication effects of the sealing lip 43 close to the accessory chamber 100 are better, which is more conducive to the high-speed rotation of the accessory gearbox. Secondly, since the second oil inlet channel 412 is tilted, it can be avoided that the lubricating oil output along the second oil inlet channel 412 vertically hits the outer peripheral wall of the rotor 1 and flows out directly along the second oil inlet channel 412, thereby ensuring that the lubricating oil can smoothly and stably fill the lubricating oil chamber and ensure the lubrication and cooling effects of the sealing lip 43.

Preferably, the rotor 1 is provided with a first oil storage chamber 13 and a second oil storage chamber 14 at intervals along the axial direction, and an oil drain hole 15 connecting the first oil storage chamber 13 and the second oil storage chamber 14. The first oil storage chamber 13 is arranged at a position corresponding to the lubricating oil chamber and is connected to the oil inlet hole 11. The second oil storage chamber 14 is arranged at the end of the rotor 1. A plurality of oil-slinging holes 12 are arranged at intervals along the circumference of the rotor 1, and the plurality of oil-slinging holes 12 are respectively connected to the second oil storage chamber 14.

Specifically, after the lubricating oil in the lubricating oil chamber enters the first oil storage chamber 13, it can enter the second oil storage chamber 14 along the oil drain hole 15, realizing two-level caching of the lubricating oil, so that sufficient lubricating oil can be provided to the multiple oil-throwing holes 12 through the second oil storage chamber 14, so that the multiple oil-throwing holes 12 can throw out the lubricating oil evenly and continuously.

Preferably, the sealing ring 41 is provided with a buffer groove 413 at a position corresponding to the position between the two sealing rings 42. The buffer groove 413 is used to enclose the bearing seat 3 to form a buffer cavity. The first oil inlet channel 31 and the second oil inlet channel 412 are respectively connected to the buffer cavity. The first oil inlet channel 31 is used to transport the lubricating oil to the buffer cavity, and the second oil inlet channel 412 is used to transport the lubricating oil in the buffer cavity to the lubricating oil cavity. The lubricating oil is cached and pressurized through the buffer cavity, so that the second oil inlet channel 412 can continuously output lubricating oil to the lubricating oil cavity at a certain pressure.

Preferably, the double-lip oil seal 4 further comprises a support frame 44 mounted on the sealing ring 41 , wherein the support frame 44 is made of a self-lubricating polymer material, and the support frame 44 supports a side of the sealing lip 43 away from the other sealing lip 43 .

Please refer to Figures 4 and 5, the support frame 44 is set to a circular ring structure, and the support frame 44 is provided with an arc-shaped support surface 441 that matches the shape of the sealing lip 43, and the arc-shaped support surface 441 is used to support the side of the sealing lip 43 away from the other sealing lip 43. Specifically, the support frame 44 is provided with two, and the two support frames 44 support the two sealing lips 43 one by one. The support frames 44 strengthen the support of the sealing lips 43, improve the stability of the sealing lips 43, avoid the sealing lips 43 from being greatly deformed, and ensure the sealing effect of the sealing lips 43.

Preferably, the outer diameter of the support frame 44 is larger than the inner diameter of the sealing ring 41 at the installation position corresponding to the support frame 44, and a notch 442 is provided on the support frame 44 so that the support frame 44 can be elastically tightened along its circumferential direction. The support frame 44 is fixed in the sealing ring 41 by its own elastic force, and is easy to disassemble and assemble.

Preferably, the surface roughness of the rotor 1 is ≯Ra0.4, the surface cylindricity is ≯0.005, and the total runout is ≯0.015. The surface of the rotor 1 is sprayed with a wear-resistant coating, specifically a chromium carbide coating or carburizing, so that the surface hardness of the rotor 1 reaches HRC58-63, thereby improving the use effect of the rotor 1.

As a second aspect, an embodiment of the present invention also provides an aircraft engine, including the above-mentioned double-lip seal accessory transmission device. Since the double-lip seal accessory transmission device can simplify the sealing structure, improve the sealing effect, reduce the overall weight, and has lower requirements for the rotor length, it is more conducive to the performance improvement of the aircraft engine, as well as the miniaturization design and lightweight design.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A double-lip seal accessory transmission device, characterized in that it comprises a rotor (1), a bearing (2), a bearing seat (3) and a double-lip oil seal (4), wherein the inner ring of the bearing (2) is mounted on the rotor (1), the outer ring of the bearing (2) is mounted on the bearing seat (3), and the double-lip oil seal (4) is arranged on one side of the bearing (2) and is used to seal the gap between the rotor (1) and the bearing seat (3); The double-lip oil seal (4) comprises a sealing ring (41) and a sealing ring (42), and two sealing lips (43) arranged at intervals along the axial direction of the rotor (1); the sealing ring (41) is sleeved between the rotor (1) and the bearing seat (3); a sealing groove (411) is provided on a side of the sealing ring (41) facing the bearing seat (3); the sealing ring (42) is embedded in the sealing groove (411) and elastically abuts against the inner wall surface of the bearing seat (3); the two sealing lips (43) are both arranged on a side of the sealing ring (41) facing the rotor (1) and elastically abut against the outer peripheral wall of the rotor (1); and one end of the sealing lip (43) away from the sealing ring (41) is bent in a direction toward the other sealing lip (43). 2. The double-lip seal accessory transmission device according to claim 1 is characterized in that two sealing rings (42) are provided at intervals along the axial direction of the sealing ring (41), the bearing seat (3) is provided with a first oil inlet channel (31) at a position corresponding to the position between the two sealing rings (42), and the sealing ring (41) is provided with a second oil inlet channel (412) at a position corresponding to the position between the two sealing rings (42), and two sealing lips (43) are enclosed between the sealing ring (41) and the rotor (1) to form a lubricating oil cavity, the first oil inlet channel (31) is used to transport lubricating oil from the outer periphery of the bearing seat (3) to the second oil inlet channel (412), and the second oil inlet channel (412) is used to transport lubricating oil to the lubricating oil cavity and lubricate and cool the two sealing lips (43). 3. The double-lip seal accessory transmission device according to claim 2 is characterized in that the end of the rotor (1) extends axially and protrudes from the double-lip oil seal (4) and is used to be set in the accessory cavity (100), and the rotor (1) is provided with an oil inlet hole (11) connected to the lubricating oil cavity along its radial direction, and the end of the rotor (1) is provided with an oil throwing hole (12) connected to the oil inlet hole (11), the oil inlet hole (11) is used to discharge the lubricating oil in the lubricating oil cavity to the oil throwing hole (12), and the oil throwing hole (12) is used to throw the lubricating oil into the accessory cavity (100) during the rotation of the rotor (1). 4. The double-lip seal accessory transmission device according to claim 3 is characterized in that one end of the second oil inlet channel (412) connected to the lubricating oil chamber is located in the middle section of the lubricating oil chamber and is inclined toward the end of the rotor (1). 5. The double-lip seal accessory transmission device according to claim 3 is characterized in that a first oil storage chamber (13) and a second oil storage chamber (14) are axially spaced apart inside the rotor (1), and an oil drain hole (15) connecting the first oil storage chamber (13) and the second oil storage chamber (14); the first oil storage chamber (13) is arranged at a position corresponding to the lubricating oil chamber and is connected to the oil inlet hole (11); the second oil storage chamber (14) is arranged at the end of the rotor (1); a plurality of oil-slinging holes (12) are spaced apart along the circumference of the rotor (1); and the plurality of oil-slinging holes (12) are respectively connected to the second oil storage chamber (14). 6. The double-lip seal accessory transmission device according to claim 2 is characterized in that a cache groove (413) is provided at a position between the two sealing rings (42) of the sealing ring (41), and the cache groove (413) is used to enclose with the bearing seat (3) to form a cache cavity, and the first oil inlet channel (31) and the second oil inlet channel (412) are respectively connected to the cache cavity. 7. The double-lip seal accessory transmission device according to claim 1 is characterized in that the double-lip oil seal (4) also includes a support frame (44) installed on the sealing ring (41) and made of self-lubricating material, and the support frame (44) is provided with an arc-shaped support surface (441) adapted to the shape of the sealing lip (43), and the arc-shaped support surface (441) is used to support the side of the sealing lip (43) away from the other sealing lip (43). 8. The double-lip seal accessory transmission device according to claim 7 is characterized in that the support skeleton (44) is set to a circular ring structure, the outer diameter of the support skeleton (44) is larger than the inner diameter of the sealing ring (41) corresponding to the installation position of the support skeleton (44), and a notch is opened on the support skeleton (44) so that the support skeleton (44) can be elastically tightened along its circumference. 9. The double lip seal accessory transmission device according to claim 1, characterized in that the surface of the rotor (1) is sprayed with a wear-resistant coating. 10. An aircraft engine, characterized by comprising a double lip seal accessory transmission device according to any one of claims 1 to 9.