Shafting sealing structure of wind turbine generator system

Abstract

The utility model relates to wind power generation equipment technical field discloses a kind of shafting sealing structure of wind turbine unit, including sealing support ring and main shaft;The shaft shoulder of the main shaft is provided with protruding portion circumferentially;The sealing support ring is L-shaped, including support part and connecting part;The support part includes the support surface for being contacted with bearing, and the connecting part includes the matching surface for interference fit with the protruding portion;So that sealing support ring is through L type design, improves the rigidity of whole while, reduced is the shrinkage deformation amount after support ring thermal expansion installation, to solve the problem that the interference fit section length is too small in the prior art sealing support ring for reducing the stress level of shafting shaft shoulder position.

Description

Technical Field

[0001] This utility model relates to the field of wind power technology, and in particular to a shaft sealing structure for a wind turbine generator set. Background Technology

[0002] With the grid parity of wind power, more and more manufacturers are demanding larger sizes and higher reliability from wind turbine products. The shaft seal support ring is a crucial component of the wind turbine shaft system, and its structural requirements are mainly reflected in three aspects. First, as a support and positioning structure for the front bearing, it needs a certain structural strength. Second, it needs to provide a high-hardness surface on the outer circumference of the bearing housing for mating with the seal ring. Third, the seal support ring must not experience any relative movement with the main ring throughout the entire lifespan of the turbine.

[0003] Traditional shaft sealing support rings are directly fixed to the bearing mounting surface. To reduce the stress level at the shaft shoulder, the front end of the support ring is partially suspended, and the actual interference fit section length is too short. Under long-term alternating loads, the support ring is at risk of loosening and slipping. Furthermore, due to the inconsistent rigidity caused by the suspended front end, gaps that do not meet the requirements of the process documents can easily occur between the support ring and the bearing mating surface after heat installation and cold contraction. Utility Model Content

[0004] The purpose of this invention is to provide a shaft sealing structure for wind turbine generator sets, which solves the problem in the prior art where the length of the interference fit section is too small due to the sealing support ring being designed to reduce the stress level at the shaft shoulder.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: In the first aspect, this utility model provides a shaft sealing structure for a wind turbine generator set, including a sealing support ring and a main shaft; The spindle has a circumferential protrusion on its shoulder; The sealing support ring is L-shaped and includes a support portion and a connecting portion; The support portion includes a support surface for contacting the bearing, and the connecting portion includes a mating surface for interference fit with the protrusion.

[0006] As an optional solution, the connection surface between the support and the connecting part is perpendicular to the axis of the main shaft.

[0007] Alternatively, the support portion extends radially along the main shaft, and the connecting portion extends axially along the main shaft.

[0008] As an optional solution, a limiting component is also included; The protrusion is provided with a mounting groove, and the mating surface is provided with an anti-rotation keyway corresponding to the position of the mounting groove, and the mounting groove is connected to the anti-rotation keyway; The fixing part of the limiting member is connected to the mounting groove, and the limiting part of the limiting member extends into the anti-rotation keyway.

[0009] As an optional solution, a sealing lip made of rubber or PTFE is integrated or fixed on the support, and the sealing lip forms a contact seal with the spindle.

[0010] As an optional solution, the corner where the connecting part and the support part are connected is provided with a smooth transition rounded corner or stress relief groove.

[0011] As an optional solution, the surface of the sealing support ring that comes into contact with the outside is coated with an anti-corrosion coating or a wear-resistant coating.

[0012] This utility model has the following unexpected beneficial effects: 1. This utility model includes a main shaft and a sealing support ring. The main shaft is provided with a protrusion to cooperate in installing an L-shaped sealing support ring. The sealing support ring includes a support part and a connecting part. The support part includes a support surface for contacting the bearing, and the connecting part includes a mating surface for interference fit with the protrusion. The L-shaped design of the sealing support ring improves the overall rigidity while reducing the shrinkage deformation after thermal expansion installation, thereby solving the problem of the short interference fit section length caused by the sealing support ring in the prior art to reduce the stress level at the shaft shoulder position.

[0013] 2. To address the risk of loosening and slippage of the sealing support ring, this utility model adds a low-stress zone protrusion structure (i.e., a protrusion) to the surface of the shaft system. By milling an anti-rotation keyway between the support ring and the main shaft to cooperate with the installation of the limiting component, the support ring can be effectively prevented from slipping. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the sealing structure of an embodiment of the present utility model; Figure 2 The sealing structure of this utility model embodiment is in Figure 1 A magnified view of a section at point A; Figure 3 This is a schematic diagram of the bearing seat with a sealing structure according to an embodiment of the present invention; Figure 4 The sealing structure of this utility model embodiment is in Figure 3 Enlarged view of section B Figure 5 This is a schematic diagram of the connection of the sealing structure according to an embodiment of the present invention; In the figure, 1 is the sealing support ring; 101 is the support part; 1011 is the support surface; 1012 is the anti-rotation keyway; 102 is the connecting part; 1021 is the mating surface; 2 is the protrusion; 201 is the mounting groove; 3 is the limiting part; 4 is the spindle; 401 is the shaft shoulder. Detailed Implementation

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0016] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] In one embodiment, such as Figures 1 to 5 As shown, in the first aspect, the present invention provides a shaft sealing structure for a wind turbine generator set, comprising a sealing support ring 1 and a main shaft 4.

[0019] The spindle 4 has a protrusion 2 around its shoulder 401. The length of the protrusion 2 extends radially along the shoulder 401 of the spindle 4, and the protrusion 2 is located in a low-stress area on the surface of the spindle 4. The protrusion 2 is an annular protrusion on the shoulder 401 of the spindle 4.

[0020] The sealing support ring 1 is L-shaped and includes a support part 101 and a connecting part 102; The connection method of the support part 101 and the connecting part 102 is not further limited here. Both the support part 101 and the connecting part 102 are structural workpieces.

[0021] The support portion 101 includes a support surface 1011 for contacting the bearing, and the connecting portion 102 includes a mating surface 1021 for interference fit with the protrusion 2.

[0022] Based on this, the sealing structure includes a protrusion 2 and a sealing support ring 1. The protrusion 2 is arranged circumferentially along the shaft shoulder 401 of the main shaft 4. The sealing support ring 1 is "L-shaped". The support portion 101 of the sealing support ring 1 includes a support surface 1011 that contacts the bearing. The connecting portion 102 of the sealing support ring 1 includes a mating surface 1021 for interference fit with the protrusion 2. Due to the structural characteristics of the sealing support ring 1, the forces from the bearing and the protrusion 2 borne by the support portion 101 and the connecting portion 102 can act on the sealing support ring 1 without interfering with each other. Therefore, after mating with the protrusion 2 in the low-stress area, it can reduce the shrinkage deformation after thermal expansion while ensuring overall rigidity. This solves the problem in the prior art where the length of the interference fit section of the sealing support ring 1 is too small due to the need to reduce the stress level at the shaft shoulder 401 position.

[0023] Furthermore, such as Figures 1 to 5 As shown, the connecting surface of the support part 101 and the connecting part 102 is perpendicular to the axis of the main shaft 4. The support part 101 extends in the radial direction of the main shaft 4, and the connecting part 102 extends in the axial direction of the main shaft 4.

[0024] The support part 101 is located on the transverse structure of the sealing support ring 1, and the connecting part 102 is located on the vertical structure of the sealing support ring 1. With the increase of the thickness of the support part 101 and the connecting part 102 in each direction, better structural strength can be obtained, but it is necessary to ensure that the support part 101 and the connecting part 102 can be installed normally.

[0025] Furthermore, such as Figures 1 to 5 As shown, it also includes a limiting component 3.

[0026] The protrusion 2 has a mounting groove 201, and the mating surface 1021 has an anti-rotation keyway 1012. The mounting groove 201 is connected to the anti-rotation keyway 1012, and the groove wall of the mounting groove 201 is aligned with the groove wall of the anti-rotation keyway 1012.

[0027] The fixing part of the limiting member 3 is installed in the mounting groove 201, and the limiting part of the limiting member 3 extends into the anti-rotation keyway 1012. At this time, the protrusion 2, the sealing support ring 1, and the limiting member 3 form a whole.

[0028] Because the interference fit, which is easy to install, may loosen due to material fatigue of the workpiece itself under the continuous and severe vibration of the wind turbine generator, resulting in a slight relative rotation (i.e., fretting wear) between the sealing ring and the main shaft 4, this utility model provides a rigid and mechanical anti-rotation guarantee for the sealing structure by setting the mounting groove 201, the anti-rotation keyway 1012 and the limiting member 3, which completely eliminates the possibility of circumferential movement and solves the problem of the sealing support ring 1 running around from the perspective of structural improvement.

[0029] Furthermore, this embodiment is not shown in the accompanying drawings. The limiting member 3 is an anti-rotation pin or bolt. Both the anti-rotation pin and bolt are standard parts, which are inexpensive, easy to procure, and can provide greater shear stress. This allows the limiting member 3 to ensure the long-term effectiveness of the anti-rotation function while reducing the difficulty of maintaining the workpiece.

[0030] Furthermore, in this embodiment not shown in the accompanying drawings, a sealing lip made of rubber or PTFE is integrated or fixed on the support portion 101, and the sealing lip forms a contact seal with the main shaft 4.

[0031] The sealing lip constitutes a dual sealing configuration of "rigid interference seal + flexible contact seal", which can effectively compensate for machining and installation errors, adapt to the slight runout and thermal deformation of the spindle 4 during operation, and fit tightly on the spindle 4. While ensuring connection strength, it effectively prevents external dust, moisture and other contaminants from entering the bearing cavity, solving the defect of using only a single interference fit that requires high machining accuracy and surface roughness.

[0032] Furthermore, in this embodiment not shown in the accompanying drawings, a rounded corner or stress relief groove is provided at the corner where the connecting part 102 connects to the support part 101. The design of this rounded corner or stress relief groove can more smoothly transition stress and disperse stress to a larger area, fundamentally avoiding the generation of cracks. This solves the problem of fatigue cracks caused by stress concentration at the right angle of the sealing support ring 1 due to the "L"-shaped structure, thereby further improving the stability of the workpiece.

[0033] Furthermore, this embodiment is not shown in the accompanying drawings. The surface of the sealing support ring 1 that comes into contact with the outside world is provided with an anti-corrosion coating or a wear-resistant coating. The corresponding coating protects the sealing support ring 1 from wind and sand corrosion and wear, thereby ensuring that the precision structure and corresponding functional surfaces of the wind turbine generator can work effectively throughout the entire life cycle of the equipment, reducing the maintenance pressure on the corresponding workers.

[0034] In summary, the sealing structure uses the protrusion 2 on the shoulder 401 of the main shaft 4 to cooperate with the sealing support ring 1 for sealing. The sealing support ring 1 is "L" shaped, and the connecting part 102 of the sealing support ring 1 is interference-fitted with the protrusion. The support part 101 supports the bearing. The L-shaped design of the sealing support ring 1 improves the overall rigidity while reducing the shrinkage deformation after thermal expansion installation. This solves the problem in the prior art where the length of the interference fit section of the sealing support ring 1 is too small due to the need to reduce the stress level at the shoulder 401 of the shaft system.

[0035] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A shaft sealing structure for a wind turbine generator set, characterized in that, Includes a sealing support ring (1) and a main shaft (4); The main shaft (4) has a circumferentially protruding part (2) on its shoulder (401). The sealing support ring (1) is L-shaped and includes a support part (101) and a connecting part (102). The support portion (101) includes a support surface (1011) for contacting the bearing, and the connecting portion (102) includes a mating surface (1021) for interference fit with the protrusion (2).

2. The sealing structure according to claim 1, characterized in that, The connection surface between the support part (101) and the connecting part (102) is perpendicular to the axis of the main shaft (4).

3. The sealing structure according to claim 1, characterized in that, The support portion (101) extends radially along the main shaft (4), and the connecting portion (102) extends axially along the main shaft (4).

4. The sealing structure according to claim 3, characterized in that, It also includes a limiting component (3); The protrusion (2) is provided with a mounting groove (201), and the mating surface (1021) is provided with an anti-rotation keyway (1012) corresponding to the position of the mounting groove (201), and the mounting groove (201) and the anti-rotation keyway (1012) are connected; The fixing part of the limiting member (3) is connected to the mounting groove (201), and the limiting part of the limiting member (3) extends into the anti-rotation keyway (1012).

5. The sealing structure according to claim 1, characterized in that, A sealing lip made of rubber or PTFE is integrated or fixed on the support part (101), and the sealing lip forms a contact seal with the main shaft (4).

6. The sealing structure according to claim 1, characterized in that, The corner where the connecting part (102) connects to the support part (101) is provided with a smooth transition rounded corner or stress relief groove.

7. The sealing structure according to claim 1, characterized in that, The sealing support ring (1) has an anti-corrosion coating or a wear-resistant coating on the surface that comes into contact with the outside.

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