Insulation end cover of wind driven generator

Abstract

The utility model relates to the technical field of motor end covers, in particular to an insulating end cover of a wind driven generator, which comprises an end cover body, a bearing chamber and an insulating bush positioned between the end cover body and the bearing chamber. The insulating bush comprises a radial supporting section positioned at the side ends of the end cover body and the bearing chamber and an axial connecting section positioned in the mounting gap; the end cover body is connected with the insulating bush through a first connecting assembly, the bearing chamber is connected with the insulating bush through a second connecting assembly, a first mounting table is arranged on the end cover body, a second mounting table is arranged on the bearing chamber, a radial supporting section of the insulating bush is supported on the first mounting table and the second mounting table, and the first connecting assembly comprises a first connecting bolt and a first gasket. The second connecting assembly comprises a second connecting bolt and a second gasket. The insulating end cover of the wind driven generator can isolate shaft current between the stator and the rotor, and is simple in structure, small in processing difficulty and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of motor end covers, and specifically provides an insulating end cover for a wind turbine generator. Background Art

[0002] Wind energy is a clean and renewable energy source. Wind power generation is widely used in water-scarce, fuel-scarce or inaccessible areas such as coastal islands, grassland pastoral areas, mountainous areas, and plateau regions, which can greatly save the consumption of non-renewable energy sources. To solve the technical problem of shaft current in wind turbine generators, common solutions include insulating bearings and insulating end covers. There are mainly the following problems with insulating bearings and insulating end covers: 1. The cost of insulating bearings is high, and the blocking effect on high-frequency shaft current generated by frequency converters is not ideal, which limits their wide application and has a limited scope of use; 2. The existing insulating end cover structure adds insulating components such as non-woven tapes, insulating gaskets, insulating washers, and insulating sleeves between metal components such as end covers, bearing chambers, and connecting bolts to cut off the shaft current between the three. However, this method has a relatively complex processing technology, a large number of insulating components, a cumbersome installation process, a long manufacturing cycle, and a high cost.

[0003] Therefore, how to design an insulating end cover for a motor with low process difficulty, high manufacturing efficiency, low cost, and a wide range of applications is an urgent problem to be solved at present. Summary of the Utility Model

[0004] In order to solve the above problems, the utility model provides an insulating end cover for a wind turbine generator, which can isolate the conduction path of shaft current between the stator and rotor structures, effectively prevent the harm of shaft current to the motor, improve the manufacturing accuracy of motor components, facilitate the installation of operators, has low process processing difficulty, high processing efficiency, and can reduce costs.

[0005] An insulating end cover for a wind turbine generator provided by the utility model specifically includes an end cover body, a bearing chamber, and an insulating bushing located between the end cover body and the bearing chamber. There is an installation gap between the end cover body and the bearing chamber. The insulating bushing includes a radial support section located at the side ends of the end cover body and the bearing chamber and an axial connection section located in the installation gap; the end cover body and the insulating bushing are connected by a first connecting component, and the bearing chamber and the insulating bushing are connected by a second connecting component.

[0006] Further, an inner sunken mounting platform one is provided on one side end face of the end cover body close to the bearing chamber, and an inner sunken mounting platform two is provided on one side end face of the bearing chamber close to the end cover body; the radial support section of the insulating bushing is supported on the mounting platform one and the mounting platform two.

[0007] Further, the axial connection section of the insulating bushing is extended and arranged towards one side from the radial support section, and the insulating bushing as a whole has a T-shaped structure.

[0008] Further, the axial connection section of the insulating bushing extends away from the radial support section to the outside of the end cover body and the bearing chamber.

[0009] Further, the first connection assembly includes a first connection bolt and a first washer disposed between the insulating bushing and the nut of the first connection bolt; the second connection assembly includes a second connection bolt and a second washer disposed between the insulating bushing and the nut of the second connection bolt.

[0010] Further, the first connection bolt connects the insulating bushing and the end cover body at the first installation platform.

[0011] Further, the second connection bolt connects the insulating bushing and the bearing chamber at the second installation platform.

[0012] Further, the axial connection section of the insulating bushing is located in the middle of the radial support section.

[0013] Compared with the prior art, the present utility model can achieve the following beneficial effects:

[0014] The insulating end cover of the wind turbine in this solution can completely block the conduction path of the shaft current between the stator and rotor structures while ensuring the reliable overall connection of the insulating end cover, effectively preventing the harm of the shaft current to the motor. Compared with the motor insulating end cover in the prior art, it has better insulating performance and better blocking effect on the shaft current.

[0015] The insulating end cover of the wind turbine in this solution can be integrally processed after the assembly of the insulating end cover is completed, which can improve the manufacturing precision of the motor components, and the insulating end cover is assembled as a whole, which is convenient for the operator to install.

[0016] The insulating end cover of the wind turbine in this solution has no lashing with non-metallic tapes, the number of components is greatly reduced, the structure is simple and reliable, the process difficulties such as heating, curing and processing are relatively low, the manufacturing cycle is short, the production efficiency is high, and the production cost is low. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the insulating end cover of the wind turbine according to an embodiment of the present utility model.

[0018] The reference numerals therein include: end cover body 1, bearing chamber 2, insulating bushing 3, installation gap 4, radial support section 5, axial connection section 6, first installation platform 7, second installation platform 8, first connection bolt 9, first washer 10, second connection bolt 11, second washer 12. Detailed Embodiment

[0019] In the following, reference will be made to the attached Figure 1Describe embodiments of the present utility model. In the following description, the same modules are denoted by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, their detailed descriptions will not be repeated.

[0020] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the following further elaborates on the present utility model in conjunction with Figure 1 the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and do not constitute a limitation to the present utility model.

[0021] A wind turbine insulating end cover, as Figure 1 shown, includes an end cover body 1, a bearing chamber 2 and an insulating bushing 3. The insulating bushing 3 is located between the end cover body 1 and the bearing chamber 2. The end cover body 1 and the insulating bushing 3 are connected by a first connecting component, and the bearing chamber 2 and the insulating bushing 3 are connected by a second connecting component. The components of the wind turbine insulating end cover in this embodiment are fewer, the assembly difficulty and the processing technology difficulty are smaller, and the cost is lower.

[0022] There is an installation gap 4 between the end cover body 1 and the bearing chamber 2. The insulating bushing 3 is integrally in a T-shaped structure, including a radial support section 5 and an axial connection section 6. The radial support section 5 is located at the side ends of the end cover body 1 and the bearing chamber 2, and the axial connection section 6 is located within the installation gap 4. The axial thickness of the radial support section 5 is relatively large, which can ensure the connection strength between the insulating bushing 3 and the end cover body 1 and the bearing chamber 2, where the radial direction is Figure 1 the direction shown by M in the figure, and the axial direction is Figure 1 the direction shown by N in the figure.

[0023] The axial connection section 6 of the insulating bushing 3 is formed by extending from the radial support section 5 towards one side. The axial connection section 6 of the insulating bushing 3 extends outwards from the end cover body 1 and the bearing chamber 2 in a direction away from the radial support section 5 to meet the requirement of the creepage distance between the end cover body 1 and the bearing chamber 2. The axial connection section 6 of the insulating bushing 3 is located in the middle of the radial support section 5 to improve the support stability.

[0024] As Figure 1 shown, an inner sunken mounting platform one 7 is provided on the side end face of the end cover body 1 close to the bearing chamber 2, and an inner sunken mounting platform two 8 is provided on the side end face of the bearing chamber 2 close to the end cover body 1. The radial support section 5 of the insulating bushing 3 is supported on the mounting platform one 7 and the mounting platform two 8, which can further improve the connection and support stability of the insulating bushing 3.

[0025] The connecting component one includes a connecting bolt one 9 and a washer one 10. The washer one 10 is arranged between the insulating bushing 3 and the nut of the connecting bolt one 9. The connecting component two includes a connecting bolt two 11 and a washer two 12. The washer two 12 is arranged between the insulating bushing 3 and the nut of the connecting bolt two 11. The connecting bolt one 9 connects the insulating bushing 3 and the end cover body 1 at the mounting platform one 7, and the connecting bolt two 11 connects the insulating bushing 3 and the bearing chamber 2 at the mounting platform two 8.

[0026] There is an interference fit between the inner circle of the end cover body 1 and the outer circle of the insulating bushing 3, and there is an interference fit between the outer circle of the bearing chamber 2 and the inner circle of the insulating end cover 3. The connection between the insulating bushing 3 and the end cover body 1 and between the insulating bushing 3 and the bearing chamber 2 through interference fit can ensure reliable connection in the radial direction and good centering.

[0027] The material of the insulating bushing 3 is SMC insulating material, which is formed by die pressing. The material is uniform and has good structural strength, and can withstand the force transmission between the stator and the rotor. At the same time, this material has good insulation performance in both cold and hot states. The mating positions of the insulating end cover 3 with other components of the generator such as the machine base and the bearing are machined after the insulating end cover 3 is assembled, which can reduce the assembly error caused by the mating and improve the force-bearing condition of the bearing operation.

[0028] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0029] The above specific implementation manners of the present invention do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A wind turbine insulation end cover, characterized in that: The invention comprises an end cover body (1), a bearing chamber (2) and an insulating bushing (3) located between the end cover body (1) and the bearing chamber (2); a mounting gap (4) is located between the end cover body (1) and the bearing chamber (2); the insulating bushing (3) comprises a radial support section (5) located at the side ends of the end cover body (1) and the bearing chamber (2) and an axial connection section (6) located in the mounting gap (4); the end cover body (1) and the insulating bushing (3) are connected by a connecting component 1, and the bearing chamber (2) and the insulating bushing (3) are connected by a connecting component 2.

2. The wind turbine insulation end cover according to claim 1, characterized in that: An inner sunken mounting platform (7) is provided on an end surface of the end cover body (1) close to the bearing chamber (2), and an inner sunken mounting platform (8) is provided on an end surface of the end cover body (1) close to the bearing chamber (2); a radial support section (5) of the insulating bushing (3) is supported on the first mounting platform (7) and the second mounting platform (8).

3. The wind turbine insulation end cover according to claim 2, characterized in that: The axial connection section (6) of the insulating bushing (3) is formed by extending the radial support section (5) toward one side, and the insulating bushing (3) is a T-shaped structure as a whole.

4. The wind turbine insulation end cover according to claim 3, characterized in that: The axial connection section (6) of the insulating bushing (3) extends to the outside of the end cover body (1) and the bearing chamber (2) in a direction away from the radial support section (5).

5. The wind turbine insulation end cover according to claim 4, characterized in that: The connecting assembly 1 comprises a connecting bolt 1 (9) and a washer 1 (10) arranged between the insulating bushing (3) and the nut of the connecting bolt 1 (9); the connecting assembly 2 comprises a connecting bolt 2 (11) and a washer 2 (12) arranged between the insulating bushing (3) and the nut of the connecting bolt 2 (11).

6. The wind turbine generator insulation end cover according to claim 5, characterized in that: The connecting bolt 1 (9) connects the insulating bushing (3) and the end cover body (1) at the mounting platform 1 (7).

7. The wind turbine insulation end cover according to claim 6, characterized in that: The second connecting bolt (11) connects the insulating bushing (3) and the bearing chamber (2) at the second mounting platform (8).

8. The wind turbine insulation end cover according to claim 7, characterized in that: The axial connecting section (6) of the insulating bushing (3) is located in the middle of the radial supporting section (5).

Images