Oil-lubricated bearing unit structure

Abstract

The present invention discloses an oil-lubricated bearing unit structure, including a bearing seat, a hollow shaft, a first sealing structure and a second sealing structure. The hollow shaft is arranged inside the bearing seat, and a first bearing and a second bearing are respectively arranged between the bearing seat and the hollow shaft. The bearing seat is provided with an oil inlet for supplying lubricating oil to flow in, and the lubricating oil is used to lubricate the first bearing and the second bearing located on both sides of the oil inlet. The bearing seat is provided with a first oil outlet and a second oil outlet at the bottom, so that the lubricating oil located at the bottom can be discharged from the first cavity of the first sealing structure and the second cavity of the second sealing structure in time. The first sealing structure and the second sealing structure can prevent the lubricating oil from entering the interior of the generator. At the same time, a guide plate is installed inside the first cavity, so that the lubricating oil thrown out during high-speed rotation falls back to the bottom of the bearing seat under the guidance of the guide plate for discharge. The bearing unit adopts the above structure, which can maximize the drainage of the lubricating oil to the oil drain hole at the bottom of the bearing unit.

Description

Technical Field

[0001] The present application relates to the field of bearing application technology, and in particular to an oil-lubricated bearing unit structure. Background Art

[0002] Semi-direct-drive permanent magnet wind turbines, integrating generators and gearboxes, are a mainstream technology for wind power generation systems. Generator and gearbox bearings share a common oil lubrication system. Due to the large size and high speed of the generator bearings, the use of contact seals similar to O-rings would result in high friction, heat generation, and severe seal wear. Therefore, the bearing units typically utilize a non-contact seal structure to prevent lubricant leakage into the generator.

[0003] Traditional non-contact sealed bearing units utilize a multi-pass labyrinth structure with oil drain holes at the bottom of the bearing unit to ensure timely discharge of lubricating oil. The throttling effect created by the labyrinth gaps prevents lubricating oil from seeping into the generator. The sealing effect is effective at low generator speeds. However, as the generator speed increases and the amount of lubricating oil increases, the sealing effect deteriorates, and it is no longer possible to completely prevent lubricating oil from entering the generator through the labyrinth.

[0004] Therefore, how to maximize the flow of lubricating oil to the oil drain hole at the bottom of the bearing unit is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The purpose of this application is to provide an oil-lubricated bearing unit structure that can maximize the flow of lubricating oil to the oil drain hole at the bottom of the bearing unit.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An oil-lubricated bearing unit structure, comprising:

[0008] The bearing seat is provided with an oil inlet for supplying lubricating oil, and an end of the bearing seat away from the oil inlet is provided with a first oil outlet and a second oil outlet, the first oil outlet and the second oil outlet are used for supplying lubricating oil;

[0009] A hollow shaft is arranged inside the bearing seat, a first bearing and a second bearing are respectively arranged between the bearing seat and the hollow shaft, and an oil inlet and a first oil outlet are both located between the first bearing and the second bearing;

[0010] The first sealing structure and the second sealing structure are located on the side of the second bearing facing away from the first bearing. The first sealing structure and the second sealing structure are respectively provided with a first cavity and a second cavity connected to the second oil outlet. The first sealing structure and the second sealing structure are both provided with an annular guide groove on the side facing away from the second bearing, and a guide plate for the outflow of lubricating oil is provided inside the first cavity.

[0011] Preferably, the first sealing structure includes an inner sealing cover and an inner retaining ring, the second sealing structure includes an outer sealing cover and an outer retaining ring, and the second sealing structure is located on a side of the first sealing structure away from the second bearing.

[0012] Preferably, the annular guide groove is respectively provided on the inner sealing cover and the outer sealing cover, and an oil drain port is provided at the bottom of the inner sealing cover, which communicates with the first cavity and the second oil outlet.

[0013] Preferably, the guide plate is connected to the inner sealing cover via fasteners.

[0014] Preferably, the guide plate has an overall conical structure, and an oil drain hole is provided at the bottom of the guide plate. The guide plate is used to collect the lubricating oil thrown out by the inner retaining ring during high-speed rotation, and the oil drain hole is used for the lubricating oil to flow out.

[0015] Preferably, an oil spray port is provided at the end of the oil inlet, and the oil spray port is used to spray lubricating oil to the first bearing and the second bearing.

[0016] Preferably, the guide plate is provided with through holes in its circumference, and the fasteners are passed through the through holes.

[0017] Preferably, the fastener is a bolt.

[0018] Preferably, the number of through holes is 7, and the through holes are symmetrically distributed on both sides of the guide plate.

[0019] Preferably, the cross-sections of the first sealing structure and the second sealing structure perpendicular to the axial direction of the hollow shaft are in the shape of a Chinese character "U".

[0020] With respect to the above-mentioned background technology, the oil-lubricated bearing unit structure provided in the present application includes a bearing seat, a hollow shaft, a first sealing structure and a second sealing structure. The bearing seat is provided with an oil inlet for lubricating oil to flow in, and the first oil outlet and the second oil outlet are provided at the end of the bearing seat away from the oil inlet, and the first oil outlet and the second oil outlet are used for lubricating oil to flow out; the hollow shaft is arranged inside the bearing seat, and a first bearing and a second bearing are respectively provided between the bearing seat and the hollow shaft, and the oil inlet and the first oil outlet are both located between the first bearing and the second bearing; the first sealing structure and the second sealing structure are located on the side of the second bearing away from the first bearing, and the first cavity and the second cavity connected to the second oil outlet are respectively provided inside the first sealing structure and the second sealing structure, and an annular guide groove is provided on the side of the first sealing structure and the second sealing structure away from the second bearing, and a guide plate for lubricating oil to flow out is provided inside the first cavity.

[0021] Specifically, the bearing seat is provided with an oil inlet for supplying lubricating oil, and the lubricating oil is used to lubricate the first bearing and the second bearing located on both sides of the oil inlet. The bearing seat is provided with a first oil outlet and a second oil outlet at the bottom, so that the lubricating oil at the bottom can be discharged from the first cavity and the second cavity in time. The first sealing structure and the second sealing structure can prevent the lubricating oil from entering the interior of the generator. At the same time, a guide plate is installed inside the first cavity, so that the lubricating oil thrown out during high-speed rotation falls back to the bottom of the bearing seat under the guidance of the guide plate and is discharged. The bearing unit adopts the above structure to maximize the drainage of the lubricating oil to the oil drain hole at the bottom of the bearing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0023] Figure 1 A schematic structural diagram of an oil-lubricated bearing unit structure provided by an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of a guide plate provided in an embodiment of the present invention.

[0025] in:

[0026] 100-bearing seat, 110-oil inlet, 120-first oil outlet, 130-second oil outlet;

[0027] 200-hollow shaft;

[0028] 300-first bearing;

[0029] 400-second bearing;

[0030] 510 - first cavity, 520 - inner sealing cover, 521 - annular guide groove, 522 - oil drain port, 530 - inner retaining ring;

[0031] 610-second cavity, 620-outer sealing cover, 630-outer retaining ring;

[0032] 700- guide plate, 710- oil drain hole;

[0033] 800-Fasteners. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] In the description of the present invention, it should be understood that the terms "up", "down", "left" and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present invention.

[0037] The purpose of this application is to provide an oil-lubricated bearing unit structure that can maximize the flow of lubricating oil to the oil drain hole at the bottom of the bearing unit.

[0038] To achieve the above objectives, the present invention provides the following technical solutions:

[0039] See also Figure 1 This embodiment provides an oil-lubricated bearing unit structure, including a bearing seat 100, a hollow shaft 200, a first sealing structure and a second sealing structure.

[0040] The bearing seat 100 is provided with an oil inlet 110 for lubricating oil to flow in, and a first oil outlet 120 and a second oil outlet 130 are provided at one end of the bearing seat 100 away from the oil inlet 110. The first oil outlet 120 and the second oil outlet 130 are used for lubricating oil to flow out.

[0041] The hollow shaft 200 is disposed inside the bearing seat 100 , and a first bearing 300 and a second bearing 400 are respectively disposed between the bearing seat 100 and the hollow shaft 200 . The oil inlet 110 and the first oil outlet 120 are both located between the first bearing 300 and the second bearing 400 .

[0042] The first sealing structure and the second sealing structure are located on the side of the second bearing 400 away from the first bearing 300. The first sealing structure and the second sealing structure are respectively provided with a first cavity 510 and a second cavity 610 connected to the second oil outlet 130. The first sealing structure and the second sealing structure are both provided with an annular guide groove 521 on the side away from the second bearing 400, and a guide plate 700 for the outflow of lubricating oil is provided inside the first cavity 510.

[0043] It should be noted that lubricating oil enters the bearing housing 100 through the oil inlet 110 and reaches the first bearing 300 and the second bearing 400 through the outlet of the oil inlet 110. A portion of the lubricating oil from the first bearing 300 is discharged directly into the oil drain area from the left side, while a portion is discharged into the oil drain area through the first oil outlet 120 of the bearing housing 100. A portion of the lubricating oil from the second bearing 400 is discharged into the oil drain area through the first oil outlet 120 of the bearing housing 100, while the remaining portion enters the first and second cavities 510 and 610 on the right side of the second bearing 400 and is discharged into the oil drain area through the second oil outlet 130 at the bottom of the bearing housing 100. The first and second sealing structures are used to prevent lubricating oil from entering the internal area of ​​the generator.

[0044] Specifically, the bearing seat 100 is provided with an oil inlet 110 for supplying lubricating oil. The lubricating oil is used to lubricate the first bearing 300 and the second bearing 400 located on the left and right sides of the oil inlet 110. The bearing seat 100 is provided with a first oil outlet 120 and a second oil outlet 130 at the bottom, so that the lubricating oil at the bottom can be discharged from the first cavity 510 and the second cavity 610 in time. The first sealing structure and the second sealing structure can prevent the lubricating oil from entering the interior of the generator. At the same time, a guide plate 700 is installed inside the first cavity 510, so that the lubricating oil thrown out during high-speed rotation can fall back to the bottom of the bearing seat 100 under the guidance of the guide plate 700 for discharge. The bearing unit adopting the above structure can maximize the drainage of the lubricating oil to the oil drain hole 710 at the bottom of the bearing unit.

[0045] Preferably, the first sealing structure includes an inner sealing cover 520 and an inner retaining ring 530 , and the second sealing structure includes an outer sealing cover 620 and an outer retaining ring 630 . The second sealing structure is located on a side of the first sealing structure away from the second bearing 400 .

[0046] It can be understood that in this embodiment, the first sealing structure includes an inner sealing cover 520 and an inner retaining ring 530, and the second sealing structure includes an outer sealing cover 620 and an outer retaining ring 630. The inner sealing cover 520, the inner retaining ring 530, the outer sealing cover 620 and the outer retaining ring 630 jointly prevent lubricating oil from entering the internal area of ​​the generator, wherein the second sealing structure is located on the side of the first sealing structure away from the second bearing 400.

[0047] Preferably, the annular guide groove 521 is respectively provided on the inner sealing cover 520 and the outer sealing cover 620 , and an oil drain port 522 is provided at the bottom of the inner sealing cover 520 , which communicates with the first cavity 510 and the second oil outlet 130 .

[0048] It can be understood that the annular guide groove 521 is respectively arranged on the inner sealing cover 520 of the first sealing structure and the outer sealing cover 620 of the second sealing structure, and the annular guide groove 521 is used to guide the lubricating oil on the surface of the inner sealing cover 520 and the outer sealing cover 620 to the bottom of the first cavity 510 and the second cavity 610 respectively and then discharge it.

[0049] It should be noted that an oil drain port 522 is provided at the bottom of the inner sealing cover 520, and the oil drain port 522 connects the first cavity 510 and the second oil outlet 130, so as to facilitate the discharge of the lubricating oil in the first cavity 510 along the oil drain port 522 and the second oil outlet 130. The opening diameter of the oil drain port 522 can be adjusted according to actual conditions as long as the above purpose can be achieved.

[0050] Preferably, the guide plate 700 is connected to the inner sealing cover 520 via a fastener 800 .

[0051] In this embodiment, the guide plate 700 is mounted on the inner sealing cover 520 via a fastener 800 , dividing the first cavity 510 of the first sealing structure into two parts.

[0052] See also Figure 2 Preferably, the guide plate 700 has a conical structure as a whole, and an oil drain hole 710 is opened at the bottom of the guide plate 700. The guide plate 700 is used to collect the lubricating oil thrown out by the inner retaining ring 530 during high-speed rotation, and the oil drain hole 710 is used for the lubricating oil to flow out.

[0053] It can be understood that the guide plate 700 has a conical structure as a whole. The conical guide plate 700 is installed on the inner sealing cover 520 through fasteners 800. An oil drain hole 710 is provided at the bottom of the guide plate 700. The guide plate 700 is used to collect the lubricating oil thrown out by the inner retaining ring 530 during high-speed rotation. The oil drain hole 710 is also located at the bottom of the inner sealing cover 520 for the lubricating oil to flow out.

[0054] It should be noted that the shape of the guide plate 700 and the size of the oil drain hole 710 can be adjusted according to actual conditions as long as they can achieve the above-mentioned purpose.

[0055] Preferably, an oil spray port is provided at the end of the oil inlet 110 , and the oil spray port is used to spray lubricating oil to the first bearing 300 and the second bearing 400 .

[0056] It can be understood that the oil inlet 110 is used for the entry of lubricating oil, and the lubricating oil is used to lubricate the first bearing 300 and the second bearing 400. When an oil spray port is provided at the end of the oil inlet 110, it is beneficial to the lubrication effect of the lubricating oil on the first bearing 300 and the second bearing 400.

[0057] Preferably, the guide plate 700 is provided with through holes in the circumference, and the fasteners 800 are passed through the through holes.

[0058] In this embodiment, the guide plate 700 is installed on the inner sealing cover 520 through fasteners 800. The guide plate 700 is circumferentially provided with through holes for the fasteners 800 to pass through. The fasteners 800 improve the stability of the guide plate 700 and the inner sealing cover 520.

[0059] Preferably, the fastener 800 is a bolt.

[0060] It should be noted that the fastener 800 is preferably a bolt. In addition, the fastener 800 can also be replaced by other connecting parts as long as it can achieve the above purpose.

[0061] Preferably, the number of through holes is 7, and the through holes are symmetrically distributed on both sides of the guide plate 700.

[0062] It is understandable that the number of through holes corresponds to the number of fasteners 800, there are 7 through holes, and the through holes are symmetrically distributed on both sides of the guide plate 700, which can make the guide plate 700 and the inner sealing cover 520 connected by the fasteners 800 more stable.

[0063] Preferably, the cross-sections of the first sealing structure and the second sealing structure perpendicular to the axial direction of the hollow shaft 200 are in the shape of a Chinese character "U".

[0064] In this embodiment, the first sealing structure and the second sealing structure both form a first cavity 510 and a second cavity 610 through a U-shaped maze, and the two U-shaped mazes are used to prevent lubricating oil from entering the internal area of ​​the generator.

[0065] In summary, the present invention is an oil-lubricated bearing unit structure, including a bearing seat 100, a hollow shaft 200, a first sealing structure and a second sealing structure. The bearing seat 100 is provided with an oil inlet 110 for supplying lubricating oil to flow in, and the end of the bearing seat 100 away from the oil inlet 110 is provided with a first oil outlet 120 and a second oil outlet 130, the first oil outlet 120 and the second oil outlet 130 are used for supplying lubricating oil to flow out; the hollow shaft 200 is arranged inside the bearing seat 100, and a first bearing 300 and a second bearing 400 are respectively provided between the bearing seat 100 and the hollow shaft 200, the oil inlet 110 and the first oil outlet 120 are both located between the first bearing 300 and the second bearing 400; the first sealing structure and the second sealing structure are located on the side of the second bearing 400 away from the first bearing 300, and a first cavity 510 and a second cavity 610 connected to the second oil outlet 130 are respectively provided inside the first sealing structure and the second sealing structure. An annular guide groove 521 is provided on the side away from the second bearing 400, and a guide plate 700 for the outflow of lubricating oil is provided inside the first cavity 510; the first sealing structure includes an inner sealing cover 520 and an inner retaining ring 530, and the second sealing structure includes an outer sealing cover 620 and an outer retaining ring 630. The second sealing structure is located on the side of the first sealing structure away from the second bearing 400; the annular guide groove 521 is respectively provided on the inner sealing cover 520 and the outer sealing cover 620, and the inner sealing cover 520 and the outer sealing cover 630 are provided. 0 is provided with an oil drain port 522 at the bottom, which communicates with the first cavity 510 and the second oil outlet 130; the guide plate 700 is connected to the inner sealing cover 520 by a fastener 800, and the guide plate 700 is a conical structure as a whole. An oil drain hole 710 is opened at the bottom of the guide plate 700, which is used to collect the lubricating oil thrown out by the inner retaining ring 530 during high-speed rotation, and the oil drain hole 710 is used for the lubricating oil to flow out; the first sealing structure and the second sealing structure are a "U"-shaped structure.

[0066] Specifically, the bearing seat 100 is provided with an oil inlet 110 for supplying lubricating oil, and the lubricating oil is used to lubricate the first bearing 300 and the second bearing 400 located on both sides of the oil inlet 110. The bearing seat 100 is provided with a first oil outlet 120 and a second oil outlet 130 at the bottom, so that the lubricating oil at the bottom is discharged from the first cavity 510 and the second cavity 610 in a timely manner. The first sealing structure composed of the inner sealing cover 520 and the inner retaining ring 530 and the outer sealing cover 620 and the outer retaining ring 630 are provided. The "U"-shaped maze of the second sealing structure can prevent the lubricating oil from entering the interior of the generator. At the same time, a conical guide plate 700 is installed on the inner sealing cover 520 through the fastener 800, so that the lubricating oil thrown out when the inner retaining ring 530 rotates at high speed can be guided by the guide plate 700 and fall back to the bottom of the bearing seat 100 through the oil drain hole 710 at the bottom of the guide plate 700 to be discharged. The bearing unit with the above structure can maximize the drainage of the lubricating oil to the oil drain hole 710 at the bottom of the bearing unit.

[0067] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0068] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An oil-lubricated bearing unit structure, characterized in that: include: The bearing seat (100) is provided with an oil inlet (110) for lubricating oil to flow in, and an end of the bearing seat (100) facing away from the oil inlet (110) is provided with a first oil outlet (120) and a second oil outlet (130), wherein the first oil outlet (120) and the second oil outlet (130) are used for the lubricating oil to flow out; A hollow shaft (200) is disposed inside the bearing seat (100), a first bearing (300) and a second bearing (400) are respectively disposed between the bearing seat (100) and the hollow shaft (200), and the oil inlet (110) and the first oil outlet (120) are both located between the first bearing (300) and the second bearing (400); A first sealing structure and a second sealing structure are located on a side of the second bearing (400) facing away from the first bearing (300), a first cavity (510) and a second cavity (610) communicating with the second oil outlet (130) are respectively provided inside the first sealing structure and the second sealing structure, an annular guide groove (521) is provided on a side of the first sealing structure and the second sealing structure facing away from the second bearing (400), and a guide plate (700) for the lubricating oil to flow out is provided inside the first cavity (510); The first sealing structure comprises an inner sealing cover (520) and an inner retaining ring (530), the second sealing structure comprises an outer sealing cover (620) and an outer retaining ring (630), and the second sealing structure is located on a side of the first sealing structure facing away from the second bearing (400); The guide plate (700) is of a conical structure as a whole. An oil drain hole (710) is provided at the bottom of the guide plate (700). The guide plate (700) is used to collect the lubricating oil thrown out by the inner retaining ring (530) during high-speed rotation. The oil drain hole (710) is used for the lubricating oil to flow out.

2. The oil-lubricated bearing unit structure according to claim 1, characterized in that: The annular guide groove (521) is respectively provided on the inner sealing cover (520) and the outer sealing cover (620); an oil drain port (522) is provided at the bottom of the inner sealing cover (520); the oil drain port (522) is connected to the first cavity (510) and the second oil outlet (130).

3. The oil-lubricated bearing unit structure according to claim 1, characterized in that: The guide plate (700) is connected to the inner sealing cover (520) via a fastener (800).

4. The oil-lubricated bearing unit structure according to claim 1, characterized in that: An oil spray port is provided at the end of the oil inlet (110), and the oil spray port is used to spray the lubricating oil onto the first bearing (300) and the second bearing (400).

5. The oil-lubricated bearing unit structure according to claim 3, characterized in that: The guide plate (700) is provided with a through hole in the circumferential direction, and the fastener (800) is passed through the through hole.

6. The oil-lubricated bearing unit structure according to claim 3, characterized in that: The fastener (800) is specifically a bolt.

7. The oil-lubricated bearing unit structure according to claim 5, characterized in that: The number of the through holes is 7, and the through holes are symmetrically distributed on both sides of the guide plate (700).

8. The oil-lubricated bearing unit structure according to any one of claims 1 to 7, characterized in that: The cross-sections of the first sealing structure and the second sealing structure perpendicular to the axial direction of the hollow shaft (200) are in the shape of a "U".

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