A wind turbine generator unit sliding bearing main shaft support structure

Abstract

The utility model discloses a kind of wind turbine generator set sliding bearing main shaft support structure, one end of main shaft is connected with wind turbine generator set blade hub, the other end of main shaft is installed in bearing seat through bearing, bearing is sliding bearing, sliding bearing is respectively installed in the inside of bearing seat and axially installed on the end face of bearing seat, the surface of sliding bearing is equipped with lubricating film and surface contact is formed between sliding bearing and bearing seat, each sliding bearing is formed by the detachable connection of several sliding bearing units;Compared with prior art, the sliding bearing used in the utility model has high load-carrying capacity and long service life, is easy to maintain, has low manufacturing cost, high operating efficiency, vibration reduction and reliability, etc., when bearing is damaged, tower maintenance can be realized without disassembling wind turbine generator set blade hub, improve wind turbine generator set operating reliability, reduce production and operation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the technical field of main shaft bearing support, and in particular to a main shaft support structure for a wind turbine sliding bearing. Background Technology

[0002] In wind turbine design, the main shaft support design is a major challenge and a key technology. Typically, the wind turbine main shaft is supported by two tapered roller bearings; see [link to relevant documentation]. Figure 1 As shown, the blade hub 01 is connected to the main shaft 02, which is supported on two tapered roller bearings 03. The tapered roller bearings 03 are mounted on the main shaft bearing housing 04 and serve as radial support and axial load bearings.

[0003] The disadvantages of tapered roller bearing support are: (1) Axial preload failure. Tapered roller bearings require precise preload to eliminate clearance, but the complex wind power conditions and alternating loads and thermal expansion and contraction of materials may lead to insufficient preload of the bearing rollers.

[0004] (2) Stress concentration at the roller edge. The spindle deflection and the mismatch between the roller cone angle and the raceway cause stress concentration at the roller end, resulting in failure phenomena such as spalling in the contact area between the roller end and the raceway.

[0005] (3) Fretting wear. During start-stop cycles, the inner ring of the bearing and the mating surface of the spindle experience micron-level slippage, oxidation wear particles, groove-like wear marks, and accelerated fatigue cracks.

[0006] (4) Lubrication failure. Centrifugal oil spillage: Grease migrates to the large end of the roller in the high-speed zone, resulting in insufficient lubrication at the small end. Low-temperature solidification: The rheological properties of the grease deteriorate at -20℃, causing roller slippage and scratches.

[0007] (5) The maintenance cost is extremely high. Replacing the main shaft bearing requires hoisting the fan, which is very costly and not economical. Utility Model Content

[0008] The purpose of this utility model is to address the shortcomings of existing technologies by providing a wind turbine sliding bearing main shaft support structure. This structure solves the problems of axial preload failure, roller stress concentration, fretting wear, lubrication failure, and high maintenance costs that currently exist due to the use of tapered roller bearings for main shaft support. This improves the operational reliability of wind turbines and reduces production and maintenance costs.

[0009] To achieve the above objectives, the technical solution provided by this utility model is as follows: a wind turbine sliding bearing main shaft support structure, one end of the main shaft is connected to the wind turbine blade hub, and the other end of the main shaft is installed in a bearing housing through a bearing. The bearing is a sliding bearing, which is radially installed inside the bearing housing and axially installed on the end face of the bearing housing, and the sliding bearing and the bearing housing form a surface contact.

[0010] Furthermore, the sliding bearing includes a radial sliding bearing and an axial sliding bearing; the main shaft is supported in the radial sliding bearing, the radial sliding bearing is installed inside the bearing housing, and the axial sliding bearing is installed on the end face of the bearing housing and supports the end of the main shaft.

[0011] Furthermore, the radial sliding bearing includes several sliding bearing units, which are detachably connected to each other.

[0012] Furthermore, the sliding bearing units of the radial sliding bearing are arranged circumferentially within the bearing housing.

[0013] Furthermore, the radial sliding bearing comprises 40-48 sliding bearing units.

[0014] Furthermore, the radial sliding bearing comprises 46-48 sliding bearing units.

[0015] Furthermore, the axial sliding bearing includes several sliding bearing units, which are detachably connected to each other.

[0016] Furthermore, the sliding bearing unit of the axial sliding bearing is arranged circumferentially at the end face of the bearing housing.

[0017] Furthermore, the axial sliding bearing comprises 40-48 sliding bearing units.

[0018] Furthermore, the axial sliding bearing comprises 46-48 sliding bearing units.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects: 1. This utility model possesses high load-bearing capacity and long service life. The sliding bearing achieves surface contact through oil film lubrication, which, compared to the point-line contact of rolling bearings, allows it to withstand greater loads and has a theoretically longer service life.

[0020] 2. This utility model features a flexible structure and convenient maintenance. The sliding bearing can be manufactured and replaced in sections, and when damaged, it can be repaired on the tower without disassembling the wind turbine blade hub, significantly reducing maintenance costs and downtime.

[0021] 3. The manufacturing cost of this utility model is low. The sliding bearing has a simple structure, uses less material, and its production cost is significantly lower than that of rolling bearings of the same specifications.

[0022] 4. The wind turbine generator set using this invention has high operating efficiency. The sliding bearing has low friction loss, and the power loss is reduced compared to the rolling bearing, thereby increasing the power generation of the wind turbine generator set and significantly improving the economic efficiency of the wind farm.

[0023] 5. This utility model possesses vibration reduction and reliability. The sliding bearing has excellent damping performance, effectively absorbing vibrations and impacts caused by wind loads, reducing material stress, and minimizing fatigue damage. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main shaft support structure of a wind turbine in the existing technology.

[0025] Figure 2 This is one of the structural schematic diagrams of this utility model.

[0026] Figure 3 This is the second structural schematic diagram of the present invention.

[0027] Figure 4 This is a circumferential structural cross-sectional view of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 an electrical 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 limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1 See Figures 2 to 4 As shown, this is the sliding bearing main shaft support structure for a 30MW wind turbine provided in this embodiment.

[0031] The blade hub 1 is connected to the input flange 2, which is connected to the main shaft 3. The main shaft 3 is supported on two rows of radial sliding bearings 4. The surface of the radial sliding bearings 4 is covered with a lubricating film, and the radial sliding bearings 4 are mounted on bearing seats 5. Preferably, the radial sliding bearings 4 consist of 48 sliding bearing units a, arranged in two rows, with 24 units in each row. The sliding bearing units a are detachably connected and circumferentially distributed on the bearing seats 5. The radial sliding bearings 4 bear the radial load transmitted from the blade hub 1. The sliding bearing units are small in size and light in weight. The design incorporates detachability, allowing for modular manufacturing and replacement. When damaged, maintenance can be performed on the tower without disassembling the wind turbine blade hub, enabling inspection and replacement during wind turbine operation intervals. This results in a short maintenance cycle, low cost, and good economic efficiency.

[0032] Two rows of axial sliding bearings 6 are installed on the front and rear end faces of the bearing housing 5. The surface of the axial sliding bearings 6 is provided with a lubricating film. Preferably, each row of axial sliding bearings 6 has 24 sliding bearing units b, for a total of 48 units. The sliding bearing units b are detachably connected. The axial load transmitted from the blade hub 1 is borne by the front and rear rows of axial sliding bearings 6. The sliding bearing units are small in size and light in weight. The design takes into account detachability, allowing for modular manufacturing and replacement. When damaged, maintenance can be carried out on the tower without disassembling the wind turbine blade hub. This means that maintenance and replacement can be performed during the wind turbine's operating intervals, resulting in a short maintenance cycle, low cost, and good economy.

[0033] In summary, compared with the existing technology, the sliding bearing adopted in this utility model has advantages such as high load-bearing capacity and long service life, easy maintenance, low manufacturing cost, high operating efficiency, vibration reduction and reliability, which significantly improves the economic efficiency of wind farms.

[0034] Example 2 The sliding bearing main shaft support structure for a 30MW wind turbine provided in this embodiment differs from Embodiment 1 in that: the radial sliding bearing consists of 40 sliding bearing units, arranged in two rows, with 20 units in each row. These units are detachably connected and circularly distributed on the bearing housing. Two rows of axial sliding bearings, each with 20 units, are installed on the front and rear end faces of the bearing housing, for a total of 40 units. These units are also detachably connected.

[0035] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all changes made in accordance with the shape and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A wind turbine generator unit sliding bearing main shaft support structure, one end of the main shaft is connected with a wind turbine generator unit blade hub, the other end of the main shaft is installed in a bearing seat through a bearing, characterized in that: The bearing is a sliding bearing, which is radially mounted inside the bearing housing and axially mounted on the end face of the bearing housing, forming a surface contact with the bearing housing.

2. A wind turbine main shaft support structure for a wind turbine main shaft bearing according to claim 1, characterized in that: The sliding bearing includes a radial sliding bearing and an axial sliding bearing; the main shaft is supported in the radial sliding bearing, which is installed inside the bearing housing, and the axial sliding bearing is installed on the end face of the bearing housing and supports the end of the main shaft.

3. A wind turbine main shaft support structure of the type defined in Claim 2, characterised in that: The radial sliding bearing includes several sliding bearing units, which are connected in a detachable manner.

4. The wind turbine sliding bearing main shaft support structure according to claim 3, characterized in that: The sliding bearing units of the radial sliding bearing are arranged circumferentially within the bearing housing.

5. A wind turbine main shaft support structure for a wind turbine main shaft bearing according to claim 3, characterized in that: The radial sliding bearing comprises 40-48 sliding bearing units.

6. A wind turbine main shaft support structure for a wind turbine main shaft bearing according to claim 5, characterized in that: The radial sliding bearing comprises 46-48 sliding bearing units.

7. The wind turbine sliding bearing main shaft support structure according to claim 2, characterized in that: The axial sliding bearing includes several sliding bearing units, which are connected in a detachable manner.

8. The wind turbine sliding bearing main shaft support structure according to claim 7, characterized in that: The sliding bearing units of the axial sliding bearing are arranged circumferentially at the end face of the bearing housing.

9. A wind turbine main shaft support structure for a wind turbine main shaft support structure according to claim 7, wherein: The axial sliding bearing comprises 40-48 sliding bearing units.

10. A wind turbine main shaft support structure for a wind turbine main shaft bearing according to claim 9, characterized in that: The axial sliding bearing comprises 46-48 sliding bearing units.

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