Insulating flange structure of megawatt semi-direct-driven wind driven generator

Abstract

The utility model relates to an insulating flange structure of a megawatt semi-direct-driven wind driven generator, which comprises a stator base shell, a flange connecting ring is arranged at the side end of the stator base shell, and a gear box rear end cover is fixedly arranged at the side end of the stator base shell through matching with the flange connecting ring. A plurality of insulating blocks and a plurality of insulating base plates are further arranged between the flange connecting ring and the gearbox rear end cover. According to the technical scheme, in consideration of process simplification and cost reduction, a weftless tape process is not adopted, a split type insulation block is adopted to be processed into an insulation seam allowance structure, meanwhile, an insulation sleeve structure in a bolt through hole is omitted, and the insulation purpose is achieved by directly increasing the diameter of the bolt through hole.

Description

Technical Field

[0001] The utility model relates to a generator device, in particular to an insulating flange structure of a megawatt-class semi-direct-drive wind generator. Background Art

[0002] In recent years, the vast majority of offshore wind turbine manufacturers have adopted a semi-direct drive technology approach. Because the generator and gearbox are mechanically coupled, any design flaws could lead to stray currents generated by the generator and converter excitation, potentially causing severe electrical damage to sensitive components within the turbine's drive train (such as bearings and gears). Even after understanding the underlying mechanisms and developing effective mitigation measures, challenges remain, such as complex processes and increased costs. Consequently, industry professionals are still in need of further technical solutions. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present utility model is to provide an insulating flange structure of a megawatt-class semi-direct-drive wind turbine, including a stator base housing, the side end of the stator base housing having a flange connecting ring, the rear end cover of the gear box being fixedly mounted at the side end of the stator base housing by cooperating with the flange connecting ring, and a plurality of insulating blocks and a plurality of insulating gaskets being provided between the flange connecting ring and the rear end cover of the gear box.

[0004] Preferably, each insulating block is fixedly mounted on the flange connection ring and is located above the rear end cover of the gear box, and insulating pads are fixedly mounted on both sides of the cover body of the rear end cover of the gear box.

[0005] Preferably, the rear end cover of the gear box is fixedly mounted on the flange connection ring by bolts, and the outer side surface of the cover of the rear end cover of the gear box is provided with a gasket that matches the bolts, that is, the bolts pass through the rear end cover of the gear box, the insulating gasket and the gasket and are threadedly engaged with the flange connection ring, and insulating gaskets are provided between the rear end cover of the gear box and the flange connection ring, and between the rear end cover of the gear box and the gasket;

[0006] The insulating block is fixedly mounted on the flange connection ring by means of bolts, that is, the bolts pass through the insulating block and engage with the threads of the flange connection ring.

[0007] Preferably, several insulating blocks are arranged in an array along the circumferential direction on the flange connecting ring, and each insulating block has several bolt through holes on its body. The lower end of the insulating block has an insulating block stop surface, and the upper end of the flange connecting ring has a flange ring stop surface that contacts and cooperates with the insulating block. The flange connecting ring also has a flange surface that contacts and cooperates with the rear end cover of the gear box and the insulating gasket.

[0008] Preferably, each insulating block is an arc block structure.

[0009] Preferably, the insulating pad is provided with a second bolt through hole, and the rear end cover of the gear box is provided with a third bolt through hole, and the aperture of the third bolt through hole is larger than the aperture of the second bolt through hole.

[0010] By means of the above solution, the present invention has at least the following advantages:

[0011] The technical solution of the present application is similar to the traditional insulating flange structure, both of which have structures such as insulating plates and bolt insulating parts. However, compared with the traditional solution, in order to simplify the process and reduce costs, the technical solution of the present application does not adopt the weft-free belt process, but instead adopts a split insulating block to be processed into an insulating stop structure. At the same time, the insulating sleeve structure in the bolt through hole is cancelled, and the insulation purpose is achieved directly by increasing the diameter of the bolt through hole.

[0012] In order to ensure the insulation effect, the insulating blocks and insulating pads in the technical solution of this application are made of typical electrical insulating materials, such as laminates, molded parts of limiting reinforcement materials, etc.

[0013] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate a certain embodiment of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a structural schematic diagram of an insulating flange structure of a megawatt-class semi-direct-drive wind turbine generator of the present application;

[0016] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0017] Figure 3 This is a schematic diagram of the structural relationship between the stator frame housing, flange connection ring and insulation block of the present application;

[0018] Figure 4 This is a schematic diagram of the structural relationship between the flange connection ring and the insulating block of the present application;

[0019] Figure 5 It is a structural diagram of the flange connection ring of the present application;

[0020] Figure 6 It is a structural schematic diagram of the insulating block of this application.

[0021] In the figure: 1 stator base housing, 2 flange connecting ring, 3 gear box rear end cover, 4 insulating block, 5 insulating gasket, 6 gasket, 7 bolt through hole 1, 8 insulating block stop surface, 9 flange ring stop surface, 10 flange surface, 11 bolt through hole 2, 12 bolt through hole 3. DETAILED DESCRIPTION

[0022] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] See also Figures 1 to 6 An insulating flange structure of a megawatt-class semi-direct-drive wind turbine generator described in a preferred embodiment of the present invention includes a stator base housing 1, a side end of the stator base housing 1 having a flange connecting ring 2, a gear box rear end cover 3 is fixedly mounted at the side end of the stator base housing 1 by cooperating with the flange connecting ring 2, and a plurality of insulating blocks 4 and a plurality of insulating pads 5 are provided between the flange connecting ring 2 and the gear box rear end cover 3.

[0024] Preferably, each insulating block 4 is fixedly mounted on the flange connection ring 2 and located above the rear end cover 3 of the gear box, and insulating pads 5 are fixedly mounted on both sides of the cover body of the rear end cover 3 of the gear box.

[0025] Preferably, the gearbox rear end cover 3 is fixedly mounted on the flange connection ring 2 by bolts, and the outer side surface of the cover body of the gearbox rear end cover 3 is provided with a gasket 6 that matches the bolts, that is, the bolts pass through the gearbox rear end cover 3, the insulating gasket 5 and the gasket 6 respectively and are threadedly matched with the flange connection ring 2, and an insulating gasket 5 is provided between the gearbox rear end cover 3 and the flange connection ring 2, and between the gearbox rear end cover 3 and the gasket 6;

[0026] The insulating block 4 is fixedly mounted on the flange connection ring 2 by means of bolts, that is, the bolts pass through the insulating block 4 and are threadedly engaged with the flange connection ring 2 .

[0027] Preferably, a plurality of insulating blocks 4 are arranged in an array along the circumferential direction on the flange connecting ring 2, and a plurality of bolt through holes 7 are opened on the body of each insulating block 4. The lower end of the body of the insulating block 4 has an insulating block stop surface 8, and the upper end of the flange connecting ring 2 has a flange ring stop surface 9 that contacts and cooperates with the insulating block 4. The flange connecting ring 2 also has a flange surface 10 that contacts and cooperates with the rear end cover 3 of the gear box and the insulating gasket 5.

[0028] Preferably, each insulating block 4 is an arc block structure.

[0029] Preferably, the insulating pad 5 is provided with a second bolt through hole 11 , and the gear box rear end cover 3 is provided with a third bolt through hole 12 , and the aperture of the third bolt through hole 12 is larger than the aperture of the second bolt through hole 11 .

[0030] During the manufacturing and processing of the technical solution of the present application, the stator frame housing 1 is first subjected to primer spraying, drilling, and rough turning processes. At this time, the flange ring stop surface 9 and the flange surface 10 of the flange connection ring 2 are both rough-machined surfaces. After the above processes are completed, the insulating block 4 can be fixed on the flange connection ring 2 by bolting, and then the fine turning process is performed. After the processing is completed, the insulating block stop surface 8 and the flange surface 10 are both fine-machined stop surfaces and fine-machined flange surfaces.

[0031] In summary, the technical solution of the present application realizes a stator frame insulating flange structure with simple process and low cost.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An insulating flange structure for a megawatt-class semi-direct-drive wind turbine generator, characterized by: The invention comprises a stator base housing (1), wherein the side end of the stator base housing (1) is provided with a flange connection ring (2), and a gear box rear end cover (3) is fixedly mounted on the side end of the stator base housing (1) by cooperating with the flange connection ring (2), and a plurality of insulating blocks (4) and a plurality of insulating pads (5) are provided between the flange connection ring (2) and the gear box rear end cover (3); Each insulating block (4) is fixedly mounted on the flange connection ring (2) and is located above the rear end cover (3) of the gear box. Insulating pads (5) are fixedly mounted on both sides of the cover body of the rear end cover (3) of the gear box. The rear end cover (3) of the gear box is fixedly mounted on the flange connection ring (2) by means of bolts. The outer side surface of the cover of the rear end cover (3) of the gear box is provided with a gasket (6) matched with the bolts. That is, the bolts respectively pass through the rear end cover (3) of the gear box, the insulating gasket (5) and the gasket (6) and are threadedly matched with the flange connection ring (2). Insulating gaskets (5) are provided between the rear end cover (3) of the gear box and the flange connection ring (2) and between the rear end cover (3) of the gear box and the gasket (6). The insulating block (4) is fixedly mounted on the flange connection ring (2) by means of bolts, that is, the bolts pass through the insulating block (4) and are threadedly engaged with the flange connection ring (2); A plurality of insulating blocks (4) are arranged in an array along the circumferential direction on the flange connection ring (2); a plurality of bolt through holes (7) are opened on the body of each insulating block (4); an insulating block stop surface (8) is provided at the lower end of the body of the insulating block (4); a flange ring stop surface (9) is provided at the upper end of the flange connection ring (2) for contacting and matching with the insulating block (4); and the flange connection ring (2) also has a flange surface (10) for contacting and matching with the rear end cover (3) of the gear box and the insulating pad (5).

2. The insulating flange structure of a megawatt-class semi-direct-drive wind turbine according to claim 1, characterized in that: Each insulating block (4) is an arc block structure.

3. The insulating flange structure of a megawatt-class semi-direct-drive wind turbine according to claim 1, characterized in that: The insulating pad (5) is provided with a second bolt through hole (11), and the rear end cover (3) of the gear box is provided with a third bolt through hole (12). The aperture of the third bolt through hole (12) is larger than the aperture of the second bolt through hole (11).

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