Wind power gear box high speed stage oil leakage prevention structure

Abstract

The utility model discloses a kind of wind power gear box high-speed level oil leakage prevention structure, including gear box shell, high-speed shaft body and dynamic sealing assembly. High-speed shaft body is fixed with gear ring body and double-tapered ring structure, fixed baffle is equipped on the outside of gear ring body, double-tapered ring and conical cylinder cooperate to form labyrinth seal, and elastic packing layer is filled between conical cylinder and shell. Through the equal-interval teeth of gear ring body centrifugal oil, baffle intercepts oil mist, double-tapered ring dynamic compensation axial movement, and the elastic sealing of packing layer, in combination with air passage pressure relief and oil return channel flow guide, realize multistage leakage prevention. The structure avoids interference assembly damage shafting, adapts to high-speed rotating condition, effectively solve the leakage problem caused by oil secondary atomization.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine gearbox sealing technology, specifically to a high-speed oil leakage prevention structure for wind turbine gearboxes. Background Technology

[0002] In wind turbine gearboxes, failure of the high-speed shaft seal is the main cause of oil leakage.

[0003] The prior art (CN220706368U) discloses a leak-proof oil structure for the high-speed stage of a wind turbine gearbox. The high-speed shaft of the wind turbine gearbox passes through a through-hole in a cover, which is then connected back to the gearbox body. The key feature is that a T-shaped oil slinger ring is fixedly fitted at the journal of the high-speed shaft. The T-shaped oil slinger ring includes a main body fixedly fitted at the journal of the high-speed shaft, with an annular protrusion on the main body. An inner and outer rings extend axially from the outer end of the annular protrusion to both sides. An oil retaining ring is fitted between the I-shaped oil slinger ring and the gearbox body. One side of the inner ring of the I-shaped oil slinger ring, the oil retaining ring, and the cover form a first oil return chamber, while one side of the outer ring of the T-shaped oil slinger ring and the cover form a second oil return chamber. The cover has an annular groove facing the second oil return chamber. The gearbox body and the cover have oil return pipes connected to the first oil return chamber. This invention reduces maintenance costs and solves the oil leakage problem at the high-speed shaft diameter of the wind turbine gearbox.

[0004] The aforementioned device employs a labyrinth structure with a rigid T-shaped oil slinger ring and a fixed oil baffle ring, which has the following drawbacks:

[0005] 1. Assembly damage: The oil slinger ring requires interference fit installation, and the high-temperature hot fitting process can easily lead to shaft deformation, affecting transmission accuracy; 2. Poor dynamic adaptability: Clearance fit components cannot compensate for axial movement during high-speed shaft operation, resulting in increased sealing clearance; 3. Secondary atomization leakage: The oil is atomized under high-speed centrifugal action, and traditional oil baffle structures cannot effectively intercept fine oil mist particles, resulting in low oil return efficiency.

[0006] This solution addresses the aforementioned issues through a flexible sealing assembly and a dynamic flow guiding structure.

[0007] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0008] In response to the problems in related technologies, this utility model proposes a leak-proof oil structure for the high-speed stage of a wind turbine gearbox to overcome the aforementioned technical problems in existing related technologies.

[0009] Therefore, the specific technical solution adopted by this utility model is as follows:

[0010] A high-speed oil leakage prevention structure for a wind turbine gearbox includes a gearbox housing. A high-speed shaft is installed at the center of the inner side of the gearbox housing. A gear ring is fixedly installed on the outer side of the high-speed shaft. An oil baffle is rotatably installed on the outer side of the gear ring. A first conical ring is provided at the left end of the gear ring. A second conical ring is provided at the left end of the first conical ring. A conical cylinder is provided on the outer side of the first and second conical rings. A filler is provided in the cavity between the conical cylinder and the gearbox housing. An oil return channel is provided in the inner wall of the gearbox housing. The inner wall of the conical cylinder forms a stepped labyrinth gap with the first and second conical rings.

[0011] As a further embodiment of this utility model, the annular teeth of the toothed ring body are arranged at equal intervals.

[0012] As a further embodiment of this utility model, the oil baffle is fixedly connected to the gearbox housing.

[0013] As a further embodiment of this utility model, the first conical ring and the second conical ring are coaxially arranged, and both the first conical ring and the second conical ring are fixedly connected to the high-speed shaft.

[0014] As a further embodiment of this utility model, a fixing ring is fixedly connected to the right end of the cone, and a mounting bolt is spirally connected to the inner side of the fixing ring, the mounting bolt penetrating the gearbox housing.

[0015] As a further embodiment of this utility model, an air passage is provided in the inner wall of the gearbox housing, and an air vent is provided on the inner side of the bottom end of the gearbox housing, with the air vent located below the packing.

[0016] As a further embodiment of this utility model, an oil return chamber is provided between the gearbox housing and the oil baffle, and the oil return channel is located on the lower side of the oil return chamber.

[0017] The beneficial effects of this utility model are as follows:

[0018] This invention utilizes a gearbox housing, oil baffle, gear ring body, first conical ring, second conical ring, conical barrel, and packing. The double conical rings and the conical surface of the conical barrel cooperate to form an adaptive labyrinth seal, allowing for small-amplitude axial movement and avoiding rigid contact wear. The silicon-based elastic packing layer absorbs high-speed shaft vibration, reducing the risk of seal gap changes. The evenly spaced teeth of the gear ring body ensure that the oil is evenly thrown out, and the oil baffle traps and condenses the oil mist, reducing leakage. The air passage and vent form a negative pressure chamber, accelerating the return of oil to the oil sump through the return oil channel, thus improving the return oil efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the oil leakage prevention structure of the high-speed stage of the wind turbine gearbox according to an embodiment of the present utility model;

[0021] Figure 2 This is an embodiment of the oil leakage prevention structure for the high-speed stage of a wind turbine gearbox according to the present invention. Figure 1 A schematic diagram of the structure at point A.

[0022] In the picture:

[0023] 1. Gearbox housing; 2. High-speed shaft; 3. Gear ring body; 4. Oil baffle; 5. First cone ring; 6. Second cone ring; 7. Cone cylinder; 8. Fixing ring; 9. Mounting bolts; 10. Packing; 11. Air passage; 12. Oil return passage. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0025] According to an embodiment of this utility model, a leak-proof structure for the high-speed stage of a wind turbine gearbox is provided.

[0026] Please refer to the instruction manual appendix. Figure 1-2 According to an embodiment of the present invention, the high-speed stage oil leakage prevention structure of the wind turbine gearbox includes a gearbox housing 1. A high-speed shaft 2 is installed in the center of the inner side of the gearbox housing 1. A gear ring 3 is fixedly installed on the outer side of the high-speed shaft 2. An oil baffle 4 is rotatably installed on the outer side of the gear ring 3. A first conical ring 5 is provided at the left end of the gear ring 3. A second conical ring 6 is provided at the left end of the first conical ring 5. A conical cylinder 7 is provided on the outer side of the first conical ring 5 and the second conical ring 6. A filler 10 is provided in the cavity between the conical cylinder 7 and the gearbox housing 1. An oil return channel 12 is provided in the inner wall of the gearbox housing 1. The inner wall of the conical cylinder 7 forms a stepped labyrinth gap with the first conical ring 5 and the second conical ring 6.

[0027] The core components of the leak-proof structure include a dynamic sealing assembly (double cone ring + cone cylinder), an oil-throwing unit (toothed ring body + oil baffle), and an oil return system.

[0028] The high-speed shaft 2 is installed in the gearbox housing 1 through bearings, and the end is fixed with a gear ring 3, which has 12 trapezoidal teeth evenly distributed around its circumference.

[0029] In one embodiment, please refer to the appendix to the specification. Figure 1-2 As a further embodiment of this utility model, the annular teeth of the toothed ring body 3 are arranged at equal intervals.

[0030] Ensure the oil is evenly distributed by centrifugation to avoid localized accumulation that could worsen atomization.

[0031] In one embodiment, please refer to the appendix to the specification. Figure 1-2 As a further embodiment of this utility model, the oil baffle 4 is fixedly connected to the gearbox housing 1.

[0032] The fixed oil baffle plate forms a stable interception cavity with the shell, and the connection method (such as welding or bolt fixing) needs to be clearly defined.

[0033] In one embodiment, please refer to the appendix to the specification. Figure 1-2 As a further embodiment of this utility model, the first conical ring 5 and the second conical ring 6 are coaxially arranged, and both the first conical ring 5 and the second conical ring 6 are fixedly connected to the high-speed shaft 2.

[0034] Ensure the concentricity of the conical seal.

[0035] In one embodiment, please refer to the appendix to the specification. Figure 1-2 As a further embodiment of this utility model, a fixing ring 8 is fixedly connected to the right end of the cone 7, and a mounting bolt 9 is spirally connected to the inner side of the fixing ring 8, the mounting bolt 9 penetrating the gearbox housing 1.

[0036] A detachable sealing module is implemented, and the bolt preload controls the packing compression.

[0037] In one embodiment, please refer to the appendix to the specification. Figure 1-2 As a further embodiment of this utility model, an air passage 11 is provided in the inner wall of the gearbox housing 1, and an air vent 13 is provided on the inner side of the bottom end of the gearbox housing 1, with the air vent 13 located below the packing 10.

[0038] The air passage is tilted at 45° to facilitate gas discharge, and the vent diameter is 3mm to prevent oil leakage.

[0039] In one embodiment, please refer to the appendix to the specification. Figure 1-2As a further embodiment of this utility model, an oil return chamber is provided between the gearbox housing 1 and the oil baffle 4, and the oil return channel 12 is located on the lower side of the oil return chamber.

[0040] The connection path between the oil return channel and the oil sump is clearly defined, and the inclination angle of the oil return channel is ≥5°. The oil baffle 4 covers the toothed ring body with a gap of 0.2mm and is fixed to the shell to form an annular oil return cavity.

[0041] Core transmission components: High-speed shaft 2 is mounted in gearbox housing 1 via bearings, with gear ring 3 fixed at the end. The gear ring has 12 trapezoidal teeth evenly distributed around its circumference. First-stage leak-proof unit: Oil baffle 4 covers the gear ring with a 0.2mm gap and is fixed to the housing to form an annular oil return chamber. Second-stage sealing module: First cone ring 5 (cone angle 30°) and second cone ring 6 (cone angle 45°) are interference-fitted with the high-speed shaft. Cone cylinder 7 is fixed by bolts 9, forming a dynamic gap of 0.1-0.3mm with the double cone rings. Elastic sealing layer: Silicone rubber filler 10 is filled between the cone cylinder and the housing, with a compression rate of 15%-20%. Flow guiding system: The housing is provided with an inclined air passage 11 and a bottom vent 13. The oil return channel 12 has a diameter of 8mm and connects the oil return chamber to the oil tank.

[0042] Workflow:

[0043] Oil slinging stage: When the high-speed shaft rotates, the teeth of the gear ring body centrifugally throw the oil towards the oil baffle plate. More than 80% of the oil is intercepted and flows into the return oil chamber along the inner wall of the oil baffle plate.

[0044] Atomization interception: When the escaping oil mist enters the double-cone ring area, it is blocked by the inner wall of the cone, and some of the oil mist condenses into droplets;

[0045] Dynamic sealing: During axial movement, the gap between the double cone ring and the cone cylinder is adaptively adjusted, and the elastic packing layer compensates for vibration displacement;

[0046] Pressure regulation: Gas in the sealed cavity is discharged through the vent via the air passage, maintaining a slight negative pressure in the cavity and preventing oil leakage;

[0047] Oil return channel: The condensed oil returns to the oil tank through the oil return channel, which greatly reduces leakage.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-speed oil-leakage-proof structure for wind turbine gearboxes, comprising a gearbox housing (1), characterized in that: A high-speed shaft (2) is installed in the center of the inner side of the gearbox housing (1). A gear ring body (3) is fixedly installed on the outer side of the high-speed shaft body (2). An oil baffle (4) is rotatably installed on the outer side of the gear ring body (3). A first conical ring (5) is provided at the left end of the gear ring body (3). A second conical ring (6) is provided at the left end of the first conical ring (5). A cone cylinder (7) is provided on the outer side of the first conical ring (5) and the second conical ring (6). A packing (10) is provided in the cavity between the cone cylinder (7) and the gearbox housing (1). An oil return channel (12) is provided in the inner wall of the gearbox housing (1). The inner wall of the cone cylinder (7) forms a stepped labyrinth gap with the first conical ring (5) and the second conical ring (6).

2. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: The annular teeth of the toothed ring body (3) are arranged at equal intervals.

3. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: The oil baffle (4) is fixedly connected to the gearbox housing (1).

4. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: The first conical ring (5) and the second conical ring (6) are coaxially arranged, and both the first conical ring (5) and the second conical ring (6) are fixedly connected to the high-speed shaft (2).

5. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: A fixing ring (8) is fixedly connected to the right end of the cone (7), and a mounting bolt (9) is spirally connected to the inner side of the fixing ring (8). The mounting bolt (9) penetrates the gearbox housing (1).

6. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: The gearbox housing (1) has an air passage (11) in its inner wall and a vent (13) on the inner side of its bottom end. The vent (13) is located below the packing (10).

7. The oil leakage prevention structure for the high-speed stage of the wind turbine gearbox according to claim 1, characterized in that: An oil return chamber is provided between the gearbox housing (1) and the oil baffle (4), and the oil return channel (12) is located on the lower side of the oil return chamber.

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