A wind power gearbox output shaft sealing oil return structure

Abstract

The present invention belongs to the technical field of wind power gearboxes, and discloses a wind power gearbox output shaft sealing oil return structure, including a gearbox housing, an output shaft, a labyrinth ring, a shaft end transparent cover and sealing lubricating oil. The gearbox housing is provided with a housing oil return channel located below the output shaft, and its first outlet is connected to the gearbox housing, and the distance between the first outlet and the output shaft axis is smaller than the distance between the second outlet and the output shaft axis; the labyrinth ring is sleeved on the output shaft; the shaft end transparent cover is provided with a labyrinth oil return channel, and a labyrinth cavity is formed between the shaft end transparent cover and the labyrinth ring, and one end of the labyrinth oil return channel is connected to the labyrinth cavity, and the other end is connected to the second outlet; the sealing lubricating oil is arranged in the housing oil return channel to isolate the first outlet and the second outlet. The wind power gearbox output shaft sealing oil return structure of the present invention can improve the sealing effect of the labyrinth cavity, and avoid the oil mist inside the gearbox housing from backflowing into the labyrinth cavity to aggravate leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power gearboxes, and in particular to a wind power gearbox output shaft sealing oil return structure. Background Art

[0002] Wind power gearbox is an important component in wind power equipment, and its product reliability is related to the safe operation of wind turbines. There is a large amount of lubricating oil inside the gearbox body, which is transmitted to the various operating parts of the gearbox through the oil circuit to ensure the lubrication and heat dissipation of gears and bearings. In order to prevent the leakage of oil and oil mist, the output shaft end generally adopts a non-contact labyrinth seal structure. From the actual operating conditions, there are still many oil leakage phenomena at the output shaft end, because the existing design of the return oil pipeline directly passes through the gearbox internal liquid level, causing part of the oil mist to enter the labyrinth seal structure from the inside of the gearbox through the return oil pipeline, increasing the risk of oil leakage of the labyrinth seal structure; these oil mists pass through the labyrinth seal structure and condense and adhere to the shaft end housing and the output shaft, polluting the cabin environment and posing a safety hazard. Summary of the invention

[0003] The object of the present invention is to provide a wind turbine gearbox output shaft sealing oil return structure to improve the sealing effect of the labyrinth cavity and avoid the oil mist inside the gearbox housing from flowing back into the labyrinth cavity to aggravate leakage.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Provided is a wind turbine gearbox output shaft sealing oil return structure, comprising:

[0006] A gearbox housing, wherein the gearbox housing is provided with a housing oil return passage, wherein the housing oil return passage has a first outlet and a second outlet, wherein the first outlet is connected to the interior of the gearbox housing;

[0007] An output shaft, the output shaft is rotatably connected to the gear box housing through a shaft bearing, the housing oil return passage is located below the output shaft, and the distance between the first outlet and the output shaft axis is smaller than the distance between the second outlet and the output shaft axis;

[0008] A labyrinth ring, wherein the labyrinth ring is sleeved on the output shaft;

[0009] A shaft end transparent cover, wherein the shaft end transparent cover is detachably connected to the end of the gear box housing, 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 connected to the labyrinth cavity, and the other end is connected to the second outlet; and

[0010] A sealing lubricating oil is disposed in the oil return passage of the casing, and the sealing lubricating oil is configured to isolate the first outlet and the second outlet.

[0011] As a preferred structure of the present invention, the labyrinth oil return channel comprises:

[0012] a first channel, one end of which is connected to the labyrinth cavity;

[0013] A second channel, wherein one end of the second channel is connected to the first channel, and the other end of the second channel is connected to the second outlet.

[0014] As a preferred structure of the present invention, the shaft end cover also includes at least one labyrinth guide ring, which divides the labyrinth cavity into multiple labyrinth chambers, and the labyrinth oil return channel includes multiple first channels, and the multiple first channels are connected to the multiple labyrinth chambers in a one-to-one correspondence.

[0015] As a preferred structure of the present invention, the sealing lubricating oil fills the second channel and invades into the plurality of first channels.

[0016] As a preferred structure of the present invention, the box oil return channel includes a third channel connecting the first outlet and the second outlet, the third channel is straight or curved or a combination of straight and curved shapes, and the sealing lubricating oil fills the third channel to isolate the first outlet and the second outlet.

[0017] As a preferred structure of the present invention, it also includes an oil baffle, which is mounted outside the labyrinth ring, one end of the oil baffle abuts against the shaft system bearing, and the other end abuts against the shaft end cover, forming an oil return chamber between the oil baffle and the labyrinth ring.

[0018] As a preferred structure of the present invention, the gear box housing also includes an oil return channel of an oil baffle having a third outlet and a fourth outlet, and the third outlet is connected to the interior of the gear box housing; the oil baffle is provided with an oil return hole of the oil baffle, one end of the oil return hole of the oil baffle is connected to the oil return chamber, and the other end is connected to the fourth outlet.

[0019] As a preferred structure of the present invention, the oil return channel of the oil baffle is located below the output shaft, and the distance between the fourth outlet and the axis of the output shaft is smaller than the distance between the third outlet and the axis of the output shaft.

[0020] As a preferred structure of the present invention, the tank oil return channel includes two branch channels, one end of the two branch channels is respectively provided with the first outlet, and the other end is directly or indirectly connected to the second outlet.

[0021] As a preferred structure of the present invention, the third outlet is not arranged directly above the first outlet.

[0022] Beneficial effects of the present invention: The wind turbine gearbox output shaft sealing oil return structure provided by the present invention retains a portion of the lubricating oil in the oil return channel of the box body as sealing lubricating oil to act as a liquid seal, and the second outlet is lower than the first outlet in the vertical direction to prevent the lubricating oil in the gearbox body from flowing back into the labyrinth oil return channel through the first outlet; the structure is simple, the processing difficulty is low, and no additional parts are added. It can improve the sealing effect of the labyrinth cavity and avoid the oil mist inside the gearbox body from flowing back into the labyrinth cavity to aggravate leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural cross-sectional view of a wind turbine gearbox output shaft sealing oil return structure provided in Embodiment 1 of the present invention;

[0024] Figure 2 The first embodiment of the present invention provides Figure 1 Partial cross-sectional view of the middle gearbox housing along the AA direction;

[0025] Figure 3 This is a front view of the wind turbine gearbox output shaft sealing oil return structure provided in the first embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the wind turbine gearbox output shaft sealing oil return structure provided in the second embodiment of the present invention.

[0027] In the figure:

[0028] 1. Gearbox housing; 11. Housing oil return channel; 111. First outlet; 112. Second outlet; 113. Third channel; 12. Oil retaining member oil return channel; 121. Third outlet; 122. Fourth outlet; 2. Output shaft; 3. Shaft system bearing; 4. Labyrinth ring; 5. Shaft end cover; 51. Labyrinth oil return channel; 511. First channel; 512. Second channel; 52. Labyrinth guide ring; 6. Labyrinth cavity; 61. Labyrinth chamber; 7. Sealing lubricant; 8. Oil retaining member; 81. Oil return chamber; 82. Oil retaining member oil return hole. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It is also necessary to explain that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] Embodiment 1

[0034] like Figure 1-Figure 3As shown, an embodiment of the present invention provides a wind power gearbox output shaft sealing oil return structure, comprising a gearbox housing 1, an output shaft 2, a labyrinth ring 4, a shaft end cover 5 and a sealing lubricant 7. The gearbox housing 1 is provided with a housing oil return channel 11, which penetrates the gearbox housing 1 along the thickness direction of the gearbox housing 1, and the housing oil return channel 11 has a first outlet 111 and a second outlet 112, and the first outlet 111 is connected to the interior of the gearbox housing 1. The output shaft 2 is rotatably connected to the gearbox housing 1 through the shaft bearing 3. Preferably, the output shaft 2 and the shaft bearing 3 are interference fit; the housing 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 this embodiment is assembled, when the second outlet 112 is located directly below the axial direction of the output shaft 2, the first outlet 111 is higher than the second outlet 112 in the vertical direction, which can prevent the lubricating oil inside the gearbox housing 1 from entering the first outlet 111 through the second outlet 112 in the reverse direction. The labyrinth ring 4 is sleeved on the output shaft 2 and one end abuts against the inner ring of the shaft bearing 3. The shaft end cover 5 is detachably connected to the end of the gear box housing 1, and is provided with a labyrinth oil return channel 51. A labyrinth cavity 6 is formed between the shaft end cover 5 and the labyrinth ring 4. One end of the labyrinth oil return channel 51 is connected to the labyrinth cavity 6, and the other end is connected to the second outlet 112. The lubricating oil in the labyrinth cavity 6 can enter the housing oil return channel 11 through the labyrinth oil return channel 51. The sealing lubricating oil 7 is arranged in the oil return channel 11 of the housing, and can extend into the labyrinth oil return channel 51. The sealing lubricating oil 7 is configured to isolate the first outlet 111 and the second outlet 112. When the sealing oil return structure of the output shaft of the wind power gearbox of this embodiment is initially assembled, the specific amount of the sealing lubricating oil 7 can be selected according to the position and shape of the housing oil return channel 11, and injected into it, so that the first outlet 111 and the second outlet 112 are isolated. During use, the sealing lubricating oil 7 continuously receives the lubricating oil return oil from the labyrinth cavity 6 through the labyrinth oil return channel 51. When the accumulated amount extends to the first outlet 111, part of the return oil can enter the gearbox housing 1. The sealing lubricating oil 7 plays a role of liquid sealing, which can not only prevent the lubricating oil inside the gearbox housing 1 from entering the labyrinth cavity 6 in the reverse direction through the housing oil return channel 11, but also does not affect the accumulated return lubricating oil flowing back to the gearbox housing 1, thereby reducing the lubricating oil leakage rate of the labyrinth cavity 6.

[0035] The wind turbine gearbox output shaft sealing oil return structure of the embodiment of the present invention has a simple structure, low processing difficulty, and no additional parts are added. A portion of the lubricating oil is retained in the box body oil return channel 11 as the sealing lubricating oil 7 to play a liquid seal role, which can improve the sealing effect of the labyrinth cavity 6 and avoid the oil mist inside the gearbox housing 1 from entering the labyrinth cavity 6 to aggravate leakage.

[0036] Furthermore, the labyrinth oil return channel 51 includes a first channel 511 and a second channel 512. The first channel 511 extends radially along the shaft end cover 5, and one end of the first channel 511 is connected to the labyrinth cavity 6. The second channel 512 extends axially along the shaft end cover 5, and one end of the second channel 512 is connected to the first channel 511, and the other end is connected to the second outlet 112. It should be noted that the radial extension along the shaft end cover 5 includes a direction that is not parallel to the radial direction, that is, there may be an angle between the first channel 511 and the vertical plane; similarly, the axial extension along the shaft end cover 5 also includes a direction that is not parallel to the axial direction, that is, there is an angle between the second channel 512 and the horizontal plane. Preferably, when assembling the output shaft sealing oil return structure of the wind power gearbox in an embodiment of the present invention, the first channel 511 is arranged in the vertical direction, and correspondingly, the second channel 512 is arranged in the horizontal direction, so as to facilitate guiding the lubricating oil in the labyrinth cavity 6 into the labyrinth oil return channel 51, such as Figure 1 The illustration is not intended to be limiting.

[0037] Furthermore, the shaft end transparent cover 5 further includes at least one labyrinth guide ring 52, which divides the labyrinth cavity 6 into a plurality of labyrinth chambers 61, and the labyrinth oil return channel 51 includes a plurality of first channels 511, which are connected to the plurality of labyrinth chambers 61 in a one-to-one correspondence, and the sealing lubricating oil 7 intrudes into the first channels 511. The labyrinth guide ring 52 can increase the walking path of the oil mist, which is convenient for the sealing effect of the labyrinth cavity 6; the lubricating oil in each labyrinth chamber 61 isolated by the labyrinth guide ring 52 can be guided to flow back through the plurality of first channels 511; further, the sealing lubricating oil 7 fills the second channel 512 and extends into the plurality of first channels 511, so that the plurality of labyrinth chambers 61 will not be interconnected through the labyrinth oil return channel 51, further avoiding the reduction of the sealing effect of the labyrinth cavity 6.

[0038] Furthermore, the box oil return channel 11 includes a third channel 113. In this embodiment, the third channel 113 is a linear channel. The sealing lubricating oil 7 is arranged in the third channel 113 and intrudes into the labyrinth oil return channel 51. Figure 1 As shown, the third channel 113 is inclined at the end of the first outlet 111 toward the axis direction of the output shaft 2, so that the second outlet 112 is lower than the first outlet 111 in the vertical direction, and the amount of the sealing lubricating oil 7 is based on covering the second outlet 112 and not flowing out of the first outlet 111, and the amount of the sealing lubricating oil 7 in the labyrinth oil return channel 51 is not limited. The linear channel described in the present application is not limited to a linear channel, but also includes a plurality of channels that are inclined at different angles to the axis direction and are connected.

[0039] Furthermore, the wind turbine gearbox output shaft sealing oil return structure of the embodiment of the present invention further includes an oil baffle 8, which is mounted outside the labyrinth ring 4, one end of the oil baffle 8 abuts against the shaft bearing 3, and the other end abuts against the shaft end transparent cover 5, and an oil return chamber 81 is formed between the oil baffle 8 and the labyrinth ring 4. Preferably, the oil baffle 8 abuts against the outer ring end face of the shaft bearing 3, and the oil return chamber 81 of the oil baffle 8 can prevent most of the oil mist from entering the labyrinth cavity 6, further improving the sealing effect.

[0040] Further, the gearbox housing 1 further comprises an oil baffle oil return passage 12 having a third outlet 121 and a fourth outlet 122, wherein the third outlet 121 is connected to the interior of the gearbox housing 1; the oil baffle 8 is provided with an oil baffle oil return hole 82, which penetrates the oil baffle 8 in the radial direction of the oil baffle 8, one end of the oil baffle oil return hole 82 is connected to the oil return chamber 81, and the other end is connected to the fourth outlet 122. Further, the oil baffle 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 baffle oil return passage 12 is inclined along the axial direction of the gearbox housing 1, and the specific inclination angle is not limited in this embodiment, so as to facilitate the inflow of lubricating oil return oil; in this embodiment, the fourth outlet 122 is located on the inner wall of the hole of the gearbox housing 1, and the third outlet 121 is located on the end surface of the gearbox housing 1 at a point lower than the fourth outlet 122. The lubricating oil blocked by the oil baffle 8 can be quickly introduced into the gear box housing 1 through the oil baffle oil return channel 12 .

[0041] Furthermore, the tank oil return channel 11 includes two branch channels, one end of each of the two branch channels is provided with a first outlet 111, and the other end is directly or indirectly connected to the second outlet 112; Figure 2 The figure shows a schematic diagram of a structure in which a branch channel is provided in the case oil return channel 11, and the two branch channels are symmetrically provided along the radial direction of the gearbox case 1; specifically, the two branch channels are provided in a Y shape, each having a first outlet 111 at one end, and intersecting at the other end to form a main channel to be connected to the second outlet 112. In this case, it can be considered that the other end of the branch channel is 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 in the figure), each having a first outlet 111 at one end, and intersecting at the other end to be directly connected to the second outlet 112.

[0042] Furthermore, the third outlet 121 is not arranged directly above the first outlet 111. Specifically, the third outlet 121 of the oil baffle oil return passage 12 cannot be arranged above the first outlet 111. The third outlet 121 of the oil baffle oil return passage 12 can be arranged lower than the first outlet 111, or when the outlet of the oil baffle oil return passage 12 is higher than the first outlet 111, it is sufficient as long as it is not arranged directly above the first outlet 111, so as to prevent the lubricating oil in the oil baffle oil return passage 12 from entering the box oil return passage 11 through the first outlet 111. Figure 3 As shown, it is a schematic diagram of the positional relationship between the third outlet 121 and the first outlet 111. The two branch channels of the housing oil return channel 11 are symmetrically arranged along the radial direction of the gearbox housing 1, and their respective first outlets 111 are respectively located on both sides of the third outlet 121, which can prevent the lubricating oil returned from the third outlet 121 from flowing into the first outlet 111.

[0043] Embodiment 2

[0044] like Figure 4 As shown, the second embodiment of the present invention has the same gearbox housing 1, output shaft 2, labyrinth ring 4, shaft end cover 5 and sealing lubricant 7 as the first embodiment, and a labyrinth cavity 6 is formed between the shaft end cover 5 and the labyrinth ring 4. The gearbox housing 1 is provided with a housing oil return channel 11, which is used to return the lubricant oil in the labyrinth cavity 6 into the gearbox housing 1. The difference between the second embodiment and the first embodiment is that the housing oil return channel 11 includes a third channel 113, which is an arc-shaped curved channel, and the sealing lubricant 7 is arranged in the arc-shaped channel and in the labyrinth oil return channel 51, and the sealing lubricant 7 fills the low position in the arc-shaped channel and extends into the labyrinth oil return channel 51.

[0045] In other embodiments, the third channel 113 may be a curved channel such as a wavy channel, or a combination of a straight channel and a curved channel such as an arc or a wavy channel, which is also within the protection scope of the present invention.

[0046] Obviously, the above 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. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A wind turbine gearbox output shaft seal oil return structure, characterized in that: include: A gearbox housing (1), the gearbox housing (1) being provided with a housing oil return passage (11), the housing oil return passage (11) having a first outlet (111) and a second outlet (112), the first outlet (111) being in communication with the interior of the gearbox housing (1); An output shaft (2), the output shaft (2) being rotatably connected to the gear box housing (1) via a shaft bearing (3), the housing oil return passage (11) being located below the output shaft (2), and the distance between the first outlet (111) and the axis of the output shaft (2) being smaller than the distance between the second outlet (112) and the axis of the output shaft (2); A labyrinth ring (4), wherein the labyrinth ring (4) is sleeved on the output shaft (2); A shaft end transparent cover (5), the shaft end transparent cover (5) being detachably connected to the end of the gear box housing (1), the shaft end transparent cover (5) being provided with a labyrinth oil return channel (51), a labyrinth cavity (6) being formed between the shaft end transparent cover (5) and the labyrinth ring (4), one end of the labyrinth oil return channel (51) being connected to the labyrinth cavity (6), and the other end of the labyrinth oil return channel (51) being connected to the second outlet (112); as well as A sealing lubricating oil (7), wherein the sealing lubricating oil (7) is arranged in the oil return channel (11) of the casing, and the sealing lubricating oil (7) is configured to isolate the first outlet (111) and the second outlet (112).

2. The wind turbine gearbox output shaft sealing oil return structure according to claim 1, characterized in that: The labyrinth oil return channel (51) comprises: A first channel (511), one end of the first channel (511) being connected to the labyrinth cavity (6); A second channel (512), one end of the second channel (512) is connected to the first channel (511), and the other end of the second channel (512) is connected to the second outlet (112).

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

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

5. The wind turbine gearbox output shaft sealing oil return structure according to claim 1, characterized in that: The box oil return channel (11) comprises a third channel (113) connecting the first outlet (111) and the second outlet (112); the third channel (113) is in a straight line shape or a curved line shape or a combination of a straight line shape and a curved line shape; the sealing lubricating oil (7) fills the third channel (113) to isolate the first outlet (111) and the second outlet (112).

6. The wind turbine gearbox output shaft sealing oil return structure according to claim 1, characterized in that: It also includes an oil baffle (8), which is sleeved outside the labyrinth ring (4), one end of the oil baffle (8) abuts against the shaft system bearing (3), and the other end abuts against the shaft end cover (5), and an oil return chamber (81) is formed between the oil baffle (8) and the labyrinth ring (4).

7. The wind turbine 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), wherein the third outlet (121) is connected to the interior of the gearbox housing (1); the oil baffle (8) is provided with an oil baffle oil return hole (82), wherein one end of the oil baffle oil return hole (82) is connected to the oil return chamber (81), and the other end is connected to the fourth outlet (122).

8. The wind turbine gearbox output shaft sealing oil return structure according to claim 7, characterized in that: The oil return channel (12) of the oil baffle 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 turbine gearbox output shaft sealing oil return structure according to claim 7, characterized in that: The tank oil return channel (11) comprises two branch channels, one end of each of the two branch channels is provided with the first outlet (111), and the other end is directly or indirectly connected to the second outlet (112).

10. The wind turbine gearbox output shaft sealing oil return structure according to claim 9, characterized in that: The third outlet (121) is not arranged directly above the first outlet (111).

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