CN114033851A

CN114033851A - Sealed oil return structure of wind power gear box output shaft

Info

Publication number: CN114033851A
Application number: CN202111514804.XA
Authority: CN
Inventors: 孙海波; 沈峰
Original assignee: Nanjing High Speed Gear Manufacturing Co Ltd
Current assignee: Nanjing High Speed Gear Manufacturing Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-02-11

Abstract

The invention belongs to the technical field of wind power gear boxes, and discloses a sealing oil return structure for an output shaft of a wind power gear box. The gearbox box body is provided with a box body oil return channel positioned below the output shaft, a first outlet of the gearbox box body is communicated with the inside of the gearbox box body, and the distance between the first outlet and the axis of the output shaft is smaller than the distance between the second outlet and the axis of the output shaft; the labyrinth ring is sleeved on the output shaft; the shaft end transparent cover is provided with a labyrinth oil return channel, a labyrinth cavity is formed between the shaft end transparent cover and the labyrinth ring, one end of the labyrinth oil return channel is communicated with the labyrinth cavity, and the other end of the labyrinth oil return channel is communicated with the second outlet; and the sealing lubricating oil is arranged in the oil return channel of the box body and used for isolating the first outlet and the second outlet. The sealing oil return structure for the output shaft of the wind power gear box can improve the sealing effect of the labyrinth cavity and prevent oil mist in the box body of the gear box from reversely flowing into the labyrinth cavity to aggravate leakage.

Description

Sealed oil return structure of wind power gear box output shaft

Technical Field

The invention relates to the technical field of wind power gear boxes, in particular to a sealing oil return structure for an output shaft of a wind power gear box.

Background

The wind power gear box is an important part in wind power equipment, and the product reliability of the wind power gear box is related to the safe operation of a wind generating set. A large amount of lubricating oil is arranged in the gearbox body, and the oil is transmitted to each running part of the gearbox through an oil way, so that the lubrication and the heat dissipation of the gear and the bearing are ensured. In order to prevent the seepage of oil liquid and oil mist, the shaft end of the output shaft generally adopts a non-contact labyrinth seal structure. From the actual operation condition, the oil leakage phenomenon at the shaft end of the output shaft is still more, because the oil return pipeline of the existing design is directly introduced above the liquid level in the gear box, part of oil mist enters the labyrinth seal structure from the interior of the gear box through the oil return pipeline, and the oil leakage risk of the labyrinth seal structure is increased; the oil mist passes through the labyrinth seal structure and is condensed and attached to the shaft end shell and the output shaft, so that the environment of the engine room is polluted, and potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a sealing oil return structure of an output shaft of a wind power gear box, which improves the sealing effect of a labyrinth cavity and prevents oil mist in a box body of the gear box from reversely flowing into the labyrinth cavity to aggravate leakage.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a wind-powered electricity generation gear box output shaft seals oil return structure, includes:

the gearbox box body is provided with a box body oil return channel, the box body oil return channel is provided with a first outlet and a second outlet, and the first outlet is communicated with the inside of the gearbox box body;

the output shaft is rotatably connected to the gearbox body through a shafting bearing, the box body oil return channel is positioned below the output shaft, and the distance between the first outlet and the axis of the output shaft is smaller than the distance between the second outlet and the axis of the output shaft;

the labyrinth ring is sleeved on the output shaft;

the shaft end transparent cover is detachably connected to the end part of the gearbox body and provided with a labyrinth oil return channel, a labyrinth cavity is formed between the shaft end transparent cover and the labyrinth ring, one end of the labyrinth oil return channel is communicated with the labyrinth cavity, and the other end of the labyrinth oil return channel is communicated with the second outlet; and

a sealing grease disposed within the tank oil return passage, the sealing grease configured to isolate the first outlet and the second outlet.

As a preferable structure of the present invention, the labyrinth oil return passage includes:

one end of the first channel is communicated with the labyrinth cavity;

and one end of the second channel is communicated with the first channel, and the other end of the second channel is communicated with the second outlet.

As a preferable structure of the invention, the shaft end transparent cover further comprises at least one labyrinth guide ring, the labyrinth guide ring divides the labyrinth cavity into a plurality of labyrinth chambers, the labyrinth oil return channel comprises a plurality of first channels, and the plurality of first channels are in one-to-one correspondence communication with the plurality of labyrinth chambers.

As a preferable configuration of the present invention, the sealing lubricant fills the second passage and intrudes into the plurality of first passages.

As a preferable structure of the present invention, the tank oil return passage includes a third passage communicating the first outlet and the second outlet, the third passage is linear or curved or a combination of linear and curved, and the sealing lubricant fills the third passage to separate the first outlet from the second outlet.

As a preferred structure of the invention, the oil-retaining device also comprises an oil-retaining member, the oil-retaining member is sleeved outside the labyrinth ring, one end of the oil-retaining member is abutted against the shafting bearing, the other end of the oil-retaining member is abutted against the shaft end transparent cover, and an oil return cavity is formed between the oil-retaining member and the labyrinth ring.

As a preferable structure of the invention, the gearbox casing further comprises an oil blocking member oil return passage having a third outlet and a fourth outlet, and the third outlet is communicated with the inside of the gearbox casing; the oil blocking piece is provided with an oil blocking piece oil return hole, one end of the oil blocking piece oil return hole is communicated with the oil return cavity, and the other end of the oil blocking piece oil return hole is communicated with the fourth outlet.

As a preferable structure of the present invention, the oil returning passage of the oil blocking member is located below the output shaft, and a distance between the fourth outlet and an axis of the output shaft is smaller than a distance between the third outlet and the axis of the output shaft.

As a preferable structure of the present invention, the tank oil return passage includes two branch passages, one end of each of the two branch passages is provided with the first outlet, and the other end of each of the two branch passages is directly or indirectly communicated with the second outlet.

In a preferred configuration of the present invention, the third outlet is not provided directly above the first outlet.

The invention has the beneficial effects that: according to the sealed oil return structure for the output shaft of the wind power gearbox, provided by the invention, a part of lubricating oil is reserved in the oil return channel of the gearbox body and is used as sealed lubricating oil to play a liquid sealing role, the second outlet is lower than the first outlet in the vertical direction, and the lubricating oil in the gearbox body is prevented from flowing backwards through the first outlet and entering the labyrinth oil return channel; simple structure, the processing degree of difficulty is low, does not additionally increase spare part, can improve the sealed effect of labyrinth cavity, and has avoided the inside oil mist of gear box to scurry and has got into labyrinth cavity and aggravate the leakage.

Drawings

FIG. 1 is a structural sectional view of a sealed oil return structure of an output shaft of a wind power gearbox according to a first embodiment of the invention;

FIG. 2 is a partial cross-sectional view taken along A-A of the gearbox housing of FIG. 1 according to one embodiment of the present invention;

FIG. 3 is a front view of a sealing oil return structure of an output shaft of a wind power gearbox according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a sealed oil return structure of an output shaft of a wind power gearbox provided by a second embodiment of the invention.

In the figure:

1. a gearbox body; 11. a tank body oil return passage; 111. a first outlet; 112. a second outlet; 113. a third channel; 12. an oil return passage of the oil baffle; 121. a third outlet; 122. a fourth outlet; 2. an output shaft; 3. a shafting bearing; 4. a labyrinth ring; 5. the shaft end is covered; 51. a labyrinth oil return passage; 511. a first channel; 512. a second channel; 52. a labyrinth guide ring; 6. a labyrinth cavity; 61. a maze room; 7. sealing lubricating oil; 8. an oil blocking member; 81. an oil return cavity; 82. keep off oil spare oil gallery.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

As shown in fig. 1 to 3, an embodiment of the invention provides a sealed oil return structure for an output shaft of a wind power gearbox, which comprises a gearbox body 1, an output shaft 2, a labyrinth ring 4, a shaft end transparent cover 5 and sealed lubricating oil 7. The gearbox box 1 is provided with a box oil return passage 11, the box oil return passage 11 penetrates through the gearbox box 1 along the thickness direction of the gearbox box 1, the box oil return passage 11 is provided with a first outlet 111 and a second outlet 112, and the first outlet 111 is communicated with the inside of the gearbox box 1. The output shaft 2 is rotatably connected to the gearbox body 1 through a shafting bearing 3, and preferably, the output shaft 2 and the shafting bearing 3 are in interference fit; the box oil return channel 11 is located below the output shaft 2, and the distance between the first outlet 111 and the axis of the output shaft 2 is smaller than the distance between the second outlet 112 and the axis of the output shaft 2, that is, after the wind power gearbox output shaft sealing oil return structure of the embodiment is assembled, when the second outlet 112 is located right below the axis of the output shaft 2, the first outlet 111 is higher than the second outlet 112 in the vertical direction, so that the lubricating oil inside the gearbox box 1 can be prevented from reversely entering the first outlet 111 through the second outlet 112. The labyrinth ring 4 is sleeved on the output shaft 2, and one end of the labyrinth ring is abutted to the inner ring of the shafting bearing 3. The shaft end transparent cover 5 is detachably connected to the end portion of the gearbox body 1, the shaft end transparent cover 5 is provided with a labyrinth oil return channel 51, a labyrinth cavity 6 is formed between the shaft end transparent cover 5 and the labyrinth ring 4, one end of the labyrinth oil return channel 51 is communicated with the labyrinth cavity 6, the other end of the labyrinth oil return channel 51 is communicated with the second outlet 112, and lubricating oil in the labyrinth cavity 6 can enter the box body oil return channel 11 through the labyrinth oil return channel 51. The sealing lubricating oil 7 is arranged in the box body oil return passage 11 and can extend into the labyrinth oil return passage 51, and the sealing lubricating oil 7 is configured to isolate the first outlet 111 and the second outlet 112; when the output shaft sealing oil return structure of the wind power gearbox is initially assembled, the specific oil quantity of the sealing lubricating oil 7 can be selected according to the position and the shape of the box body oil return channel 11 and injected into the box body oil return channel, so that the first outlet 111 and the second outlet 112 are isolated; in the use process, the sealing lubricating oil 7 continuously receives the lubricating oil return oil in the labyrinth cavity 6 through the labyrinth oil return passage 51, and when the accumulated amount extends to the first outlet 111, part of the lubricating oil can enter the gearbox box body 1. The sealing lubricating oil 7 plays a role in liquid sealing, lubricating oil in the gear box body 1 can be prevented from reversely entering the labyrinth cavity 6 through the box body oil return channel 11, and accumulated backflow lubricating oil is not influenced to flow back to the interior of the gear box body 1, so that the lubricating oil leakage rate of the labyrinth cavity 6 is reduced.

The sealing oil return structure of the output shaft of the wind power gearbox is simple in structure and low in processing difficulty, additional parts are not added, a part of lubricating oil reserved in the box body oil return channel 11 serves as sealing lubricating oil 7 to achieve a liquid sealing effect, the sealing effect of the labyrinth cavity 6 can be improved, and oil mist in the gearbox body 1 is prevented from flowing backwards into the labyrinth cavity 6 to cause heavy leakage.

Further, the labyrinth oil return passage 51 includes a first passage 511 and a second passage 512. The first passage 511 extends in the radial direction of the shaft-end transparent cover 5, and one end of the first passage 511 communicates with the labyrinth chamber 6. The second channel 512 extends along the axial direction of the shaft end transparent cover 5, one end of the second channel 512 is communicated with the first channel 511, and the other end is communicated with the second outlet 112. It should be noted that, the radial extension of the shaft end through cover 5 includes a direction non-parallel to the radial direction, i.e. the first passage 511 may have an angle with the vertical plane; likewise, the axial extension of the shaft end through cover 5 also includes a direction non-parallel to the axial direction, i.e. the second channel 512 is at an angle to the horizontal plane. Preferably, when the wind power gearbox output shaft sealing oil return structure according to the embodiment of the invention is assembled, the first passage 511 is arranged in the vertical direction, and correspondingly, the second passage 512 is arranged in the horizontal direction, so that the lubricating oil in the labyrinth cavity 6 is guided and discharged into the labyrinth oil return passage 51, as shown in fig. 1, but the illustration is not limited.

Further, the shaft end transparent cover 5 further comprises at least one labyrinth guide ring 52, the labyrinth guide ring 52 divides the labyrinth cavity 6 into a plurality of labyrinth chambers 61, the labyrinth oil return passage 51 comprises a plurality of first passages 511, the plurality of first passages 511 are communicated with the plurality of labyrinth chambers 61 in a one-to-one correspondence manner, and the sealing lubricating oil 7 enters the first passages 511. The labyrinth guide ring 52 can increase the walking path of the oil mist, so that the sealing effect of the labyrinth cavity 6 is facilitated; the lubricating oil in each labyrinth chamber 61 separated by the labyrinth guide ring 52 can be guided and returned through the plurality of first passages 511; further, the sealing lubricant 7 fills the second passage 512 and extends into the plurality of first passages 511, so that the plurality of labyrinth chambers 61 do not communicate with each other through the labyrinth oil return passage 51, thereby further avoiding a reduction in the sealing effect of the labyrinth chamber 6.

Further, the tank oil return passage 11 includes a third passage 113, in this embodiment, the third passage 113 is a linear passage, and the sealing lubricant 7 is provided in the third passage 113 and intrudes into the labyrinth oil return passage 51. As shown in fig. 1, the third passage 113 is inclined at the end of the first outlet 111 toward the axial direction of the output shaft 2, so that the second outlet 112 is lower than the first outlet 111 in the vertical direction, the amount of the sealing lubricant 7 is such that the sealing lubricant 7 covers the second outlet 112 and does not flow out of the first outlet 111, and the amount of the sealing lubricant 7 in the labyrinth oil return passage 51 is not limited. The linear passage is not limited to a single linear passage, and includes a plurality of passages that are inclined at different angles to the axial direction and communicate with each other.

Furthermore, the sealed oil return structure of the output shaft of the wind power gearbox in the embodiment of the invention further comprises an oil blocking member 8, the oil blocking member 8 is sleeved outside the labyrinth ring 4, one end of the oil blocking member 8 is abutted to the shafting bearing 3, the other end of the oil blocking member is abutted to the shaft end transparent cover 5, and an oil return cavity 81 is formed between the oil blocking member 8 and the labyrinth ring 4. Preferably, the oil blocking member 8 abuts against the outer ring end face of the shafting bearing 3, and the oil return cavity 81 of the oil blocking member 8 can block most of oil mist from entering the labyrinth cavity 6, so that the sealing effect is further improved.

Further, the gearbox housing 1 also comprises an oil baffle return passage 12 with a third outlet 121 and a fourth outlet 122, wherein the third outlet 121 is communicated with the interior of the gearbox housing 1; the oil blocking member 8 is provided with an oil blocking member oil return hole 82, the oil blocking member oil return hole 82 penetrates through the oil blocking member 8 along the radial direction of the oil blocking member 8, one end of the oil blocking member oil return hole 82 is communicated with the oil return cavity 81, and the other end of the oil blocking member oil return hole is communicated with the fourth outlet 122. Furthermore, the oil-blocking member oil return passage 12 is located below the output shaft 2, and the distance between the fourth outlet 122 and the axis of the output shaft 2 is smaller than the distance between the third outlet 121 and the axis of the output shaft 2, that is, the oil-blocking member oil return passage 12 is obliquely arranged along the axial direction of the gearbox housing 1, and the specific inclination angle thereof is not limited in this embodiment, so as to facilitate the return flow of the lubricating oil; in the present embodiment, the fourth outlet 122 is located on the inner wall of the bore of the gearbox housing 1, and the third outlet 121 is located on the end face of the gearbox housing 1 at a position lower than the fourth outlet 122. The lubricating oil blocked by the oil blocking member 8 can be quickly guided into the gearbox box body 1 through the oil blocking member oil return passage 12.

Furthermore, the tank body oil return passage 11 includes two branch passages, one end of each branch passage is provided with a first outlet 111, and the other end of each branch passage is directly or indirectly communicated with a second outlet 112; as shown in fig. 2, a schematic structural diagram of a branch passage for the case body oil return passage 11 is provided, and two branch passages are symmetrically arranged along the radial direction of the gearbox case body 1; specifically, the two branch channels are arranged in a Y shape, and each of the two branch channels has a first outlet 111 at one end, and the two branch channels converge at the other end to form a main channel and jointly communicate with a second outlet 112, in which case, the other end of the branch channel is considered to be indirectly connected to the second outlet 112 through the main channel. In other embodiments, the two branch channels may also be V-shaped (not shown), and each of the two branch channels has a first outlet 111 at one end thereof, and meets at the other end thereof and directly communicates with a second outlet 112.

Further, the third outlet 121 is not disposed directly above the first outlet 111. Specifically, that is, the third outlet 121 of the oil-blocking member oil return passage 12 cannot be disposed above the first outlet 111, the third outlet 121 of the oil-blocking member oil return passage 12 may be lower than the first outlet 111, or when the outlet of the oil-blocking member oil return passage 12 is higher than the first outlet 111, the third outlet may be disposed not right above the first outlet 111, so as to prevent the lubricating oil in the oil-blocking member oil return passage 12 from entering the tank oil return passage 11 through the first outlet 111. As shown in fig. 3, which is a schematic diagram of the position relationship between the third outlet 121 and the first outlet 111, the two branch passages of the case body oil return passage 11 are symmetrically arranged along the radial direction of the gearbox case body 1, and the respective first outlets 111 are respectively located at two sides of the third outlet 121, so that the lubricating oil returned by the third outlet 121 can be prevented from flowing into the first outlets 111.

Example two

As shown in FIG. 4, the second embodiment of the invention has the same gearbox body 1, output shaft 2, labyrinth ring 4, shaft end transparent cover 5 and sealing lubricating oil 7 as the first embodiment, and a labyrinth cavity 6 is formed between the shaft end transparent cover 5 and the labyrinth ring 4. The gearbox body 1 is provided with a body oil return passage 11 for returning lubricating oil in the labyrinth cavity 6 to flow into the gearbox body 1. The difference between the second embodiment and the first embodiment is that the tank oil return passage 11 includes a third passage 113, the third passage 113 is an arc-shaped curved passage, the sealing lubricant 7 is disposed in the arc-shaped passage and the labyrinth oil return passage 51, and the sealing lubricant 7 fills a low position in the arc-shaped passage and extends into the labyrinth oil return passage 51.

In other embodiments, the third channel 113 may be a curved channel such as a wave, or a combination of a straight channel and a curved channel such as an arc, a wave, etc., which is also within the scope of the present invention.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a wind-powered electricity generation gear box output shaft seals oil return structure which characterized in that includes:

the gearbox casing (1), the gearbox casing (1) is provided with a casing oil return channel (11), the casing oil return channel (11) is provided with a first outlet (111) and a second outlet (112), and the first outlet (111) is communicated with the inside of the gearbox casing (1);

the output shaft (2) is rotatably connected to the gearbox body (1) through a shafting bearing (3), the box body oil return channel (11) is located below the output shaft (2), and the distance between the first outlet (111) and the axis of the output shaft (2) is smaller than the distance between the second outlet (112) and the axis of the output shaft (2);

the labyrinth ring (4), the said labyrinth ring (4) is fitted on the said output shaft (2);

the shaft end transparent cover (5), the shaft end transparent cover (5) is detachably connected to the end part of the gearbox body (1), the shaft end transparent cover (5) is provided with a labyrinth oil return channel (51), a labyrinth cavity (6) is formed between the shaft end transparent cover (5) and the labyrinth ring (4), one end of the labyrinth oil return channel (51) is communicated with the labyrinth cavity (6), and the other end of the labyrinth oil return channel is communicated with the second outlet (112); and

a sealing grease (7), the sealing grease (7) disposed within the tank oil return passage (11), the sealing grease (7) configured to isolate the first outlet (111) and the second outlet (112).

2. The wind power gearbox output shaft sealing oil return structure according to claim 1, wherein the labyrinth oil return passage (51) comprises:

a first passage (511), one end of the first passage (511) is communicated with the labyrinth cavity (6);

a second channel (512), wherein one end of the second channel (512) is communicated with the first channel (511), and the other end is communicated with the second outlet (112).

3. The wind power gearbox output shaft sealing oil return structure according to claim 2, characterized in that the shaft end transparent cover (5) further comprises at least one labyrinth guide ring (52), the labyrinth guide ring (52) divides the labyrinth cavity (6) into a plurality of labyrinth chambers (61), the labyrinth oil return channel (51) comprises a plurality of first channels (511), and the plurality of first channels (511) are communicated with the plurality of labyrinth chambers (61) in a one-to-one correspondence manner.

4. The wind power gearbox output shaft sealing oil return structure according to claim 3, wherein the sealing lubricating oil (7) fills the second channel (512) and invades into the plurality of first channels (511).

5. The wind power gearbox output shaft sealing oil return structure according to claim 1, wherein the box oil return passage (11) comprises a third passage (113) communicating the first outlet (111) and the second outlet (112), the third passage (113) is linear or curved or a combination of linear and curved, and the sealing lubricating oil (7) fills the third passage (113) to separate the first outlet (111) from the second outlet (112).

6. The wind power gearbox output shaft sealing oil return structure according to claim 1, further comprising an oil blocking member (8), wherein the oil blocking member (8) is sleeved outside the labyrinth ring (4), one end of the oil blocking member (8) is abutted to the shafting bearing (3), the other end of the oil blocking member is abutted to the shaft end transparent cover (5), and an oil return cavity (81) is formed between the oil blocking member (8) and the labyrinth ring (4).

7. The wind power gearbox output shaft sealing oil return structure according to claim 6, characterized in that the gearbox housing (1) further comprises an oil baffle oil return passage (12) having a third outlet (121) and a fourth outlet (122), the third outlet (121) communicating with the inside of the gearbox housing (1); the oil blocking piece (8) is provided with an oil blocking piece oil return hole (82), one end of the oil blocking piece oil return hole (82) is communicated with the oil return cavity (81), and the other end of the oil blocking piece oil return hole is communicated with the fourth outlet (122).

8. The wind power gearbox output shaft sealing oil return structure according to claim 7, characterized in that the oil baffle return passage (12) is located below the output shaft (2), and the distance between the fourth outlet (122) and the axis of the output shaft (2) is smaller than the distance between the third outlet (121) and the axis of the output shaft (2).

9. The wind power gearbox output shaft sealing oil return structure according to claim 7, wherein the box body oil return channel (11) comprises two branch channels, one end of each branch channel is provided with the first outlet (111), and the other end of each branch channel is directly or indirectly communicated with the second outlet (112).

10. The wind power gearbox output shaft sealed oil return structure of claim 9, characterized in that the third outlet (121) is not disposed directly above the first outlet (111).