A gear ring fixing structure for a combined drive yaw system of a wind turbine generator set

Abstract

This invention discloses a gear ring fixing structure for a combined drive yaw system of a wind turbine generator. The yaw system employs two yaw gear rings: an outer yaw gear ring and an inner yaw gear ring. The meshing surface of the outer yaw gear ring is the external tooth surface, and the meshing surface of the inner yaw gear ring is the internal tooth surface. Each of the two yaw gear rings is individually meshed and driven by an independent yaw motor. The gear ring fixing structure includes a gear ring fixing flange and friction gaskets. The inner yaw gear ring has a flange hole and is connected to the gear ring fixing flange by bolts. The outer yaw gear ring does not have a flange hole, and a friction gasket is placed between its bottom surface and the top surface of the gear ring fixing flange. The horizontal and vertical displacement of the outer yaw gear ring is restricted by the aforementioned bolts. The gear ring fixing flange is connected and fixed to the tower flange of the wind turbine generator by bolts. This invention effectively connects and fixes the two yaw gear rings without affecting installation and commissioning.

Description

Technical Field

[0001] This invention relates to the technical field of wind turbine generator sets, and in particular to a gear ring fixing structure for a combined drive yaw system of a wind turbine generator set. Background Technology

[0002] The following points are mainly considered in the design of wind turbine generator sets:

[0003] The mainstream yaw system for current large wind turbine generators uses a single-tooth ring yaw. Because there is only one toothed ring, this structure makes it easy to adjust the pitch between the toothed ring and the yaw drive. It can be connected and fixed to the base using only one set of brakes or bearings. The single-tooth ring flange also has only one set of bolt holes, allowing direct connection to the tower flange. No additional fixing or conversion components are needed to meet commissioning and hoisting requirements.

[0004] For the combined internal and external yaw system, in order to facilitate independent adjustment of the internal and external yaw gears, the internal and external gears are designed separately, that is, two yaw gear rings are used to manage the internal and external yaw respectively, so the two gear rings can move independently.

[0005] This involves the key issues of how to fix the inner and outer gear rings and how to transport and hoist the entire machine:

[0006] 1. Since the inner and outer gear rings are separate, an additional fixing structure is required compared to a single gear ring;

[0007] 2. If both the inner and outer gear rings use traditional flange connections, after the yaw adjustment is completed, the relative positions of the two sets of flange holes on the inner and outer gear rings will be uncertain, and they will ultimately be unable to properly align with the tower flange. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and to propose a gear ring fixing structure for a wind turbine generator set combined drive yaw system, which can effectively connect and fix the two yaw gear rings without affecting installation and commissioning.

[0009] To achieve the above objectives, the technical solution provided by this invention is as follows: a gear ring fixing structure for a combined drive yaw system of a wind turbine generator set. The yaw system employs two yaw gear rings, namely an outer yaw gear ring and an inner yaw gear ring. The meshing surface of the outer yaw gear ring is the outer tooth surface, and the meshing surface of the inner yaw gear ring is the inner tooth surface. Both yaw gear rings are individually meshed and driven by independent yaw motors. The gear ring fixing structure includes a gear ring fixing flange and friction gaskets. The inner yaw gear ring has a flange hole and is connected to the gear ring fixing flange by bolts. The outer yaw gear ring does not have a flange hole, and a friction gasket is provided between its bottom surface and the top surface of the gear ring fixing flange. The horizontal and vertical displacements of the outer yaw gear ring are restricted by the aforementioned bolts. The gear ring fixing flange is connected and fixed to the tower flange of the wind turbine generator set by bolts.

[0010] Furthermore, the gear ring fixing flange is a single-ring ring, requiring only two sets of bolt holes to be machined: one set for the internal yaw gear ring connection and the other set for the tower flange connection.

[0011] Furthermore, the bolts used to connect the inner yaw gear ring and the gear ring fixing flange are countersunk bolts.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] 1. The yaw gear ring fixing method is simple and has no installation interference. It uses bolts to fix the inner yaw gear ring and friction shims to fix the outer yaw gear ring, which does not interfere with the independent tooth adjustment of the inner and outer yaw gear rings.

[0014] 2. The adoption of the gear ring fixing flange enables the two yaw gear rings to be integrated into one package during the yaw assembly (by using the gear ring fixing flange, the inner yaw gear ring is fixed with bolts and the outer yaw gear ring is fixed with friction gaskets, so that the four major components of the base, inner yaw gear ring, gear ring fixing flange and outer yaw gear ring are packaged into a whole, realizing the overall lifting), which is beneficial for the transportation of the whole machine and direct hoisting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gear ring fixing structure on the combined drive yaw system of a wind turbine generator.

[0016] Reference numerals: 1-Gear ring fixing flange, 2-External yaw motor, 3-External yaw gear ring, 4-Internal yaw motor, 5-Internal yaw gear ring, 6-Yaw brake, 7-Base, 8-Tower flange, 9-Friction pad, 10-Counterhead screw. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0018] like Figure 1 As shown, this embodiment discloses a gear ring fixing structure for a combined drive yaw system of a wind turbine generator set. The yaw system employs two yaw gear rings: an outer yaw gear ring 3 and an inner yaw gear ring 5. The meshing surface of the outer yaw gear ring 3 is an external tooth surface, and the meshing surface of the inner yaw gear ring 5 is an internal tooth surface. Both yaw gear rings are individually meshed and driven by independent yaw motors. The gear ring fixing structure includes a gear ring fixing flange 1 and a friction gasket 9. The inner yaw gear ring 5 has a flange hole and is connected to the gear ring fixing flange 1 by countersunk bolts 10. The outer yaw gear ring 3 does not have a flange hole, and a friction gasket 9 is provided between its bottom surface and the top surface of the gear ring fixing flange 1. The horizontal and vertical displacements of the outer yaw gear ring 3 are restricted by the countersunk bolts 10. The gear ring fixing flange 1 is connected and fixed to the tower flange 8 of the wind turbine generator set by bolts.

[0019] Preferably, the toothed ring fixing flange 1 is a single-ring ring that can be cast as a whole, requiring only two sets of bolt holes to be machined: one set for connecting the inner yaw toothed ring 5 and the other set for connecting the tower flange 8.

[0020] By using the gear ring fixing flange 1, the inner yaw gear ring 5 and the friction pad 9 are fixed with bolts to fix the outer yaw gear ring 3, so that the four major components of the base 7, the inner yaw gear ring 5, the gear ring fixing flange 1, and the outer yaw gear ring 3 are packaged into a whole, realizing the overall lifting.

[0021] With the base 7 as the lifting anchor point, the constraint force transmission path during lifting is: base - (bearing or brake) - inner yaw gear ring - (countersunk bolt) - gear ring fixing flange - (friction gasket) - outer yaw gear ring.

[0022] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A gear ring fixing structure of a wind turbine unit combined drive yaw system, the yaw system adopts two yaw gear rings, an outer yaw gear ring (3) and an inner yaw gear ring (5), the meshing surface of the outer yaw gear ring (3) is an outer tooth surface, the meshing surface of the inner yaw gear ring (5) is an inner tooth surface, the yaw system further comprises an outer yaw motor and an inner yaw motor, a machine base provides a mounting surface for the outer yaw motor and the inner yaw motor, the outer yaw motor is meshed with the outer tooth surface of the outer yaw gear ring (3), the inner yaw motor is meshed with the inner tooth surface of the inner yaw gear ring (5), and the outer yaw gear ring (3) and the inner yaw gear ring (5) are both meshed and driven by independent yaw motors; characterized in that: The gear ring fixing structure includes a gear ring fixing flange (1) and a friction gasket (9). The inner yaw gear ring (5) is provided with a flange hole, and the inner yaw gear ring (5) is connected to the gear ring fixing flange (1) by bolts. The outer yaw gear ring (3) is not provided with a flange hole, and a friction gasket (9) is provided between its bottom surface and the top surface of the gear ring fixing flange (1). By tightening with the above-mentioned bolts, the horizontal and vertical displacements of the outer yaw gear ring (3) are restricted. The gear ring fixing flange (1) is connected to the wind turbine by bolts. The tower flange (8) of the generator set is connected and fixed; by using the gear ring fixing flange (1), the inner yaw gear ring (5) and the friction pad (9) are fixed with bolts to fix the outer yaw gear ring (3), so that the four major components of the base, inner yaw gear ring (5), gear ring fixing flange (1) and outer yaw gear ring (3) are packaged into a whole, realizing the overall lifting; the gear ring fixing flange (1) is a single ring, and only two sets of bolt holes need to be machined, one set for the connection of the inner yaw gear ring (5) and the other set for the connection of the tower flange (8).

2. The gear ring fixing structure of a wind turbine generator combined drive yaw system according to claim 1, characterized in that: The bolts used to connect the inner yaw gear ring (5) and the gear ring fixing flange (1) are countersunk bolts (10).

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