Rotary bearing oil seal structure

Abstract

The application discloses a rotary bearing oil sealing structure and relates to the technical field of water wheel power generation equipment. The rotary bearing oil sealing structure comprises a thrust head, a mirror plate, a thrust pad, a thrust bearing seat and an oil groove. The thrust head is arranged on a rotating shaft. The mirror plate is arranged at the lower end of the thrust head. The oil groove is arranged at the lower end of the thrust head. The thrust bearing seat and lubricating oil are arranged in the oil groove. The thrust pad is arranged above the thrust bearing seat. An oil film is formed between the mirror plate and the thrust pad. An annular groove is arranged outside the thrust head. The annular groove is connected with the oil groove. An oil blocking ring is arranged above the oil groove. The lower end of the oil blocking ring is inserted into the annular groove filled with the lubricating oil. When the unit is operated, the thrust head rotates under the action of the rotating shaft. The mirror plate rotates along with the thrust head, thereby driving the lubricating oil to rotate, hit the oil groove and generate oil mist. The lower end of the oil blocking ring is inserted into the annular groove filled with the lubricating oil. The generated oil mist is blocked in the outer cavity by the oil blocking ring and the lubricating oil, thereby preventing the oil mist from overflowing.

Description

Technical Field

[0001] This invention relates to the field of hydroelectric power generation equipment technology, and specifically to a rotary bearing oil seal structure. Background Technology

[0002] Conventional hydroelectric generator bearing lubrication typically employs an immersion method, meaning the bearing pads are continuously submerged in lubricating oil during unit operation. However, the bearing's operation significantly agitates the lubricating oil in the oil sump, easily leading to the generation of oil mist. The generation and overflow of this oil mist cause environmental pollution throughout the generator unit. Furthermore, the oil mist, mixed with dust generated during unit operation, adheres to the surfaces of the unit's electrical structural components, potentially causing insulation failure and electrical accidents.

[0003] Currently, the oil sump of units using lubricated bearings mostly employs oil-sealed structures, such as contact-type oil baffles. However, the sealing of lubricated bearings is a seal between moving and stationary parts. Due to the certain degree of runout of the rotating parts, the contact parts cannot achieve 100% fit, resulting in an unsatisfactory sealing effect. Furthermore, as the contact parts wear, the sealing effect deteriorates further.

[0004] Chinese patent CN111765247A, published on October 13, 2020, discloses a combined bearing for a hydro-generator set, including a thrust bearing and an oil trough. An oil trough cover is provided above the oil trough, and the cover includes an annular plate and a vertical sleeve. The annular plate is fixedly installed on the top wall of the oil trough, and the vertical sleeve is located below the annular plate and fixedly connected to the inner ring side of the annular plate. The thrust bearing includes a thrust head, which passes through the vertical sleeve. A sealing cover is provided between the top of the thrust head and the oil trough cover. An oil mist conveying mechanism is provided on the side wall inside the sealing cover of the thrust head, and an oil mist cleaning mechanism is provided on the oil trough cover. The oil mist conveying mechanism directs the oil mist generated by the rotation of the thrust head to the cleaning mechanism via airflow. The oil mist cleaning mechanism alternately collects the oil mist and then discharges the collected lubricating oil into the oil trough.

[0005] The device has a fan blade inside the oil tank, which causes the pressure inside the oil tank to increase. A negative pressure zone is formed between the bearing and the generator rotor hub above the oil tank cover. The high-pressure gas containing oil mist in the oil tank carries the oil mist from between the thrust bearing and the sealing cover to the generator's air passage, thus contaminating the unit and increasing the waste of lubricating oil. It also cannot prevent oil mist from overflowing. Summary of the Invention

[0006] This invention aims to solve the problem of oil mist overflow and provides a rotary bearing oil sealing structure. When the unit is running, the thrust head rotates under the action of the rotating shaft. The mirror plate rotates with the thrust, thereby driving the lubricating oil to rotate and impact the oil groove and generate oil mist. The lower end of the oil blocking ring is inserted into the annular groove filled with lubricating oil. The generated oil mist is blocked by the oil blocking ring and the lubricating oil in the outer cavity, which plays the role of preventing oil mist overflow.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A rotary bearing oil sealing structure includes a thrust head, a mirror plate, a thrust bearing pad, a thrust bearing housing, and an oil groove. The thrust head is mounted on a rotating shaft, the mirror plate is mounted at the lower end of the thrust head, and the oil groove is fitted around the lower end of the thrust head. The oil groove contains the thrust bearing housing and lubricating oil. A thrust bearing pad is mounted above the thrust bearing housing. An oil film is formed between the mirror plate and the thrust bearing pad. An annular groove is provided on the outer side of the thrust head, and the annular groove is connected to the oil groove. An oil-blocking ring is provided above the oil groove, and the lower end of the oil-blocking ring is inserted into the annular groove filled with lubricating oil.

[0009] Preferably, the annular groove has multiple connecting ports on its outer side.

[0010] Preferably, a labyrinth ring is provided above the annular groove.

[0011] Preferably, the lower end of the oil-blocking ring is provided with a non-stick coating.

[0012] Preferably, the lower end of the oil-blocking ring is inverted conical.

[0013] Preferably, a sealing cap is provided between the inner side of the oil-blocking ring and the thrust head.

[0014] Preferably, a gap labyrinth for sealing is provided between the sealing cover and the thrust head.

[0015] Preferably, the top of the oil tank and the sealing cover is provided with an oil mist suction pipe.

[0016] Preferably, the side wall of the oil tank is provided with a side cover.

[0017] Preferably, a sealing ring is provided between the side cover and the side wall of the oil tank.

[0018] The beneficial effects of this technical solution are as follows:

[0019] I. The present invention provides a rotary bearing oil sealing structure. When the unit is running, the thrust head rotates under the action of the rotating shaft. The mirror plate rotates with the thrust, thereby driving the lubricating oil to rotate and impact the oil groove and generate oil mist. The lower end of the oil blocking ring is inserted into the annular groove filled with lubricating oil. The generated oil mist is blocked by the oil blocking ring and the lubricating oil in the outer cavity, which plays a role in preventing the oil mist from overflowing.

[0020] II. The present invention provides a rotary bearing oil sealing structure in which the oil blocking ring is also agitated in the annular groove, and a labyrinth ring is provided at the upper part of the annular groove to further prevent the lubricating oil from overflowing from the annular groove.

[0021] Third, the present invention provides a rotary bearing oil sealing structure in which a non-stick coating is applied to the lower end surface of the oil blocking ring to reduce the stirring of the lubricating oil by the oil blocking ring.

[0022] IV. The present invention provides a rotary bearing oil sealing structure, wherein the lower end of the oil blocking ring is inverted conical to prevent lubricating oil from escaping upward.

[0023] V. The rotary bearing oil sealing structure provided by the present invention further enhances the effect of preventing oil mist overflow by setting the sealing cover and the gap labyrinth.

[0024] VI. The present invention provides a rotary bearing oil sealing structure in which a small amount of overflowing oil mist is discharged by an oil mist suction and discharge pipe and an oil mist suction and discharge device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the oil-blocking ring in this invention;

[0028] The components are: 1. Rotating shaft; 2. Thrust head; 3. Mirror plate; 4. Thrust bearing; 5. Thrust bearing seat; 6. Oil groove; 7. Lubricating oil; 8. Oil blocking ring; 8.1. Connecting part; 8.2. Lower extension part; 9. Oil mist suction and discharge pipe; 10. Sealing cover; 11. Annular groove; 12. Connecting port; 13. Oil storage chamber under the annular groove; 14. Labyrinth ring; 15. Non-stick coating; 16. Side cover; 17. Sealing ring; 18. Gap labyrinth. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0030] It should be noted that when a component is referred to as being "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0031] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0032] Example 1

[0033] like Figures 1-3As shown, a rotary bearing oil sealing structure includes a thrust head 2, a mirror plate 3, a thrust bearing pad 4, a thrust bearing seat 5, and an oil groove 6. The thrust head 2 is mounted on a rotating shaft 1 via a key or bolt. The mirror plate 3 is located at the lower end of the thrust head 2. The oil groove 6 is fitted around the lower end of the thrust head 2. The oil groove 6 contains the thrust bearing seat 5 and lubricating oil 7. The thrust bearing seat 5 is fixedly mounted on the lower end of the inner wall of the oil groove 6. The thrust bearing pad 4 is positioned above the thrust bearing seat 5. An oil seal is formed between the mirror plate 3 and the thrust bearing pad 4. The thrust head 2 has an annular groove 11 on its outer side, which is connected to the oil tank 6, ensuring that the level of the annular groove 11 and the lubricating oil 7 in the oil tank 6 are consistent. An oil-blocking ring 8 is provided above the oil tank 6. The oil-blocking ring 8 includes a connecting part 8.1 and a lower extension 8.2. The connecting part 8.1 is fixedly connected to the upper part of the oil tank 6, and the lower end of the lower extension 8.1 is inserted into the annular groove 11 filled with lubricating oil 7. The upper surface of the lubricating oil 7 in the annular groove 11 is lower than the upper surface of the annular groove 11. During unit operation, the thrust head 2 rotates under the action of the rotating shaft 1. The mirror plate 3 rotates with the thrust, causing the lubricating oil 7 to rotate and impact the oil tank 6, generating oil mist. The lower end of the oil-blocking ring 8 is inserted into the annular groove 11 filled with lubricating oil 7. The generated oil mist is blocked by the oil-blocking ring 8 and the lubricating oil 7 in the outer cavity, preventing oil mist from overflowing.

[0034] Example 2

[0035] The difference between this embodiment and embodiment 1 is that: multiple connecting ports 12 are provided on the outer side of the annular groove 11, and the multiple connecting ports 12 make the oil storage chamber 13 at the lower end of the annular groove 11 and the lubricating oil 7 in the oil tank 6 become consistent more quickly.

[0036] The annular groove 11 is provided with a labyrinth ring 14 above it, and the oil blocking ring 8 is also agitated in the annular groove 11. The labyrinth ring 14 is provided at the upper part of the annular groove 11 to further prevent the lubricating oil 7 from overflowing in the annular groove 11.

[0037] The lower end of the oil-blocking ring 8 is provided with a non-stick coating 15 to reduce the stirring of the lubricating oil 7 by the oil-blocking ring 8.

[0038] The lower end of the oil-blocking ring 8 is inverted conical to prevent lubricating oil 7 from escaping upwards.

[0039] A sealing cap 10 is provided between the inner side of the oil-blocking ring 8 and the thrust head 2.

[0040] The sealing cover 10 and the thrust head 2 are provided with a gap labyrinth 18 for sealing, which further enhances the effect of preventing oil mist from overflowing.

[0041] The oil tank 6 and the top of the sealing cover 10 are provided with an oil mist suction pipe 9, which is connected to an oil mist suction device and can discharge a small amount of oil mist that overflows to the sealing cover 10 and the top of the oil tank 6.

[0042] The oil tank 6 is provided with a side cover 16 on its side wall.

[0043] A sealing ring 17 is provided between the side cover 16 and the side wall of the oil tank 6. The side cover 16 is used to inspect and maintain the thrust bearing bearing without removing other components.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A rotating bearing oil seal structure, characterized in that: The device includes a thrust head (2), a mirror plate (3), a thrust bearing (4), a thrust bearing seat (5), and an oil groove (6). The thrust head (2) is mounted on a rotating shaft (1), the mirror plate (3) is mounted at the lower end of the thrust head (2), and the oil groove (6) is fitted onto the lower end of the thrust head (2). The oil groove (6) contains the thrust bearing seat (5) and lubricating oil (7). The thrust bearing seat (5) is mounted above the thrust bearing seat (5), and an oil film is formed between the mirror plate (3) and the thrust bearing seat (4). An annular groove (11) is provided on the outside of the oil groove (6), the annular groove (11) is connected to the oil groove (6), an oil blocking ring (8) is provided above the oil groove (6), and the lower end of the oil blocking ring (8) is inserted into the annular groove (11) filled with lubricating oil (7); multiple connecting ports (12) are provided on the outside of the annular groove (11); a labyrinth ring (14) is provided above the annular groove (11); a non-stick coating (15) is provided at the lower end of the oil blocking ring (8); the lower end of the oil blocking ring (8) is inverted conical.

2. The rotary bearing oil seal structure according to claim 1, characterized in that: A sealing cap (10) is provided between the inner side of the oil blocking ring (8) and the thrust head (2).

3. The rotary bearing oil seal structure according to claim 2, characterized in that: A gap labyrinth (18) for sealing is provided between the sealing cap (10) and the thrust head (2).

4. The rotary bearing oil seal structure according to claim 3, characterized in that: The top of the oil tank (6) and the sealing cover (10) is provided with an oil mist suction pipe (9).

5. The rotary bearing oil seal structure according to claim 4, characterized in that: The oil tank (6) is provided with a side cover (16) on its side wall.

6. The rotary bearing oil seal structure according to claim 5, characterized in that: A sealing ring (17) is provided between the side cover (16) and the side wall of the oil tank (6).

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