Pole body insulation fixing structure of hydro-generator pole coil

Abstract

The utility model discloses a pole body insulation fixing structure of a pole coil of a hydro-generator, which relates to the technical field of hydro-generators and comprises a pole body insulation plate arranged between a pole iron core and the pole coil, a wedge-shaped self-locking pressing block is fixed on the pole iron core through a locking bolt, a counter bore is arranged on a pressing block inclined surface of the wedge-shaped self-locking pressing block, and the counter bore is connected with the wedge-shaped self-locking pressing block. A bolt hole is formed in the counter bore, a threaded hole is correspondingly formed in the magnetic pole iron core, a locking bolt penetrates through the bolt hole and is screwed with the threaded hole to fix the wedge-shaped self-locking pressing block on the magnetic pole iron core, and a lock washer is arranged between the head of the locking bolt and the wedge-shaped self-locking pressing block; the pressing block inclined surface of the wedge-shaped self-locking pressing block is in good contact with the magnetic pole iron core and is vertical to the pole body insulating plate; the wedge-shaped self-locking pressing block comprises a locking part and a protruding part, and one end of the pole body insulating plate is provided with a notch matched with the wedge-shaped self-locking pressing block and connected with the protruding part in an abutting mode. According to the utility model, the abnormal movement of the pole body insulation can be more effectively avoided, and the reliability of the magnetic pole insulation is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generator technology, specifically to an insulation and fixing structure for the magnetic pole coil of a hydro-generator. Background Technology

[0002] During the assembly of a hydro-generator, reliable pole insulation must be installed between the pole coil and the pole core to ensure the insulation performance of the magnetic pole assembly. For poles with internal ventilation structures, the pole insulation needs to be intermittently installed to meet the internal ventilation requirements. The pole insulation is glued to the inner side of the pole core or pole coil. During actual operation of the unit, the pole coil deforms due to centrifugal force and heating, which may cause relative displacement between the pole coil and the pole core in the axial, circumferential, and radial directions. Over time, this displacement may cause the pole insulation plate to fail to adhere properly, resulting in abnormal movement.

[0003] Existing technical solutions employ an adhesive coating process to bond the insulating board to the magnetic pole body. However, due to potential relative displacement between the magnetic pole coil and the magnetic pole core in the axial, circumferential, and radial directions, the problem of the insulating board shifting within the pole body still occurs after long-term operation.

[0004] Chinese patent document CN108465966A, published on August 31, 2018, discloses a welding protection process for magnetic pole iron support plates. Based on product performance requirements, this method protects the magnetic pole iron support plates during welding by implementing pre-treatment processes, preventing damage to the insulation from molten slag and spatter during welding. This ensures the installation quality of the insulation material during magnetic pole assembly, guarantees the electrical performance of the generator's magnetic poles, and provides crucial assurance for the stable and safe operation of the generator. However, this technical solution involves wrapping the pole body insulation around the magnetic pole core and fixing the pole body insulation plate by uniformly adjusting the gap and welding the iron support plate. While the welding points provide initial fixation, during actual operation, as the operating time increases, the weld seam may develop defects due to vibration, thermal expansion, or fatigue stress, leading to loosening of the iron support plate and abnormal movement of the pole body insulation plate. Furthermore, any loosening or displacement that may occur during operation cannot be adjusted after welding. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model proposes a pole body insulation fixing structure for a hydro-generator magnetic pole coil, which can more effectively avoid abnormal movement of the pole body insulation and improve the reliability of the magnetic pole insulation.

[0006] This utility model is achieved using the following technical solution:

[0007] A pole body insulation fixing structure for a hydro-generator magnetic pole coil includes a pole body insulation plate disposed between the magnetic pole core and the magnetic pole coil. A wedge-shaped self-locking block is fixed to the magnetic pole core by locking bolts. The wedge-shaped self-locking block has several countersunk holes on its inclined surface, each countersunk hole containing a bolt hole. Corresponding threaded holes are provided on the magnetic pole core. The locking bolts pass through the bolt holes and engage with the threaded holes to tighten and fix the wedge-shaped self-locking block to the magnetic pole core. A locking washer is provided between the head of the tightening bolt and the wedge-shaped self-locking block; the inclined surface of the wedge-shaped self-locking block is in good contact with the magnetic pole core, and the block shall not be higher than the inner surface of the magnetic pole core after installation; the wedge-shaped self-locking block is perpendicular to the pole body insulation plate; the wedge-shaped self-locking block includes a locking part that contacts the magnetic pole core and a protruding part that protrudes out of the magnetic pole core; one end of the pole body insulation plate is provided with a notch that cooperates with the wedge-shaped self-locking block and abuts against the protruding part of the wedge-shaped self-locking block.

[0008] The surface of the pole body insulating plate that contacts the magnetic pole core is provided with embedded protrusions, and the magnetic pole core is provided with holes that cooperate with the embedded protrusions. The embedded protrusions are embedded in the holes of the magnetic pole core to reduce movement.

[0009] One side of the pole body insulating plate is fixed to the magnetic pole core by adhesive-impregnated felt, and the other side is in smooth contact with the magnetic pole coil; or one side of the pole body insulating plate is fixed to the magnetic pole coil by adhesive-impregnated felt, and the other side is in smooth contact with the magnetic pole core.

[0010] The distance between the protrusion of the wedge-shaped self-locking pressure block and the magnetic pole coil is 8-15mm.

[0011] At least one countersunk hole is provided.

[0012] The countersunk holes are symmetrically arranged on the inclined surface of the wedge-shaped self-locking pressure block.

[0013] The bolt hole in the countersunk hole of the wedge-shaped self-locking block is coaxially set with the threaded hole on the magnetic pole core, and the front end of the threaded hole is set as a smooth hole.

[0014] The length of the protrusion is not less than the thickness of the electrode insulation plate.

[0015] The protruding part of the wedge-shaped self-locking pressure block has an anti-slip texture.

[0016] The wedge-shaped self-locking pressure block is covered with a corrosion-resistant coating.

[0017] The wedge-shaped self-locking pressure block is made of high-strength materials such as steel and aluminum alloy.

[0018] Compared with the prior art, the advantages of this utility model are as follows:

[0019] 1. In this utility model, a wedge-shaped self-locking block is fixed to the magnetic pole core by a locking bolt. The wedge-shaped self-locking block cooperates with the pole body insulation plate. A stop washer is set between the head of the locking bolt and the wedge-shaped self-locking block, which effectively prevents abnormal movement of the pole body insulation, improves the reliability of the magnetic pole insulation and enhances the overall stability of the structure. At the same time, the stop washer effectively prevents the bolt from loosening, enhances the locking reliability, and the wedge-shaped self-locking block can generate additional preload force to ensure the clamping effect. It can guarantee long-term operation and fixation in high vibration environment, and can also be loosened, adjusted or disassembled when necessary.

[0020] 2. In this utility model, the combination of embedded protrusions and holes further restricts the movement of the electrode insulation plate, significantly improves the stability of the connection, and prevents the insulation plate from shifting or misaligning due to mechanical vibration, thereby ensuring the insulation effect and long-term reliability.

[0021] 3. In this utility model, one side of the pole body insulation plate is fixed to the magnetic pole core or magnetic pole coil by adhesive-impregnated felt. By attaching and fixing one side of the pole body insulation plate to the magnetic pole core or magnetic pole coil with adhesive-impregnated felt, the positioning stability of the insulation plate can be effectively enhanced, preventing loosening or displacement caused by vibration, thermal expansion or centrifugal force during operation. The other side makes smooth contact with the contact parts, reducing wear between the insulation plate and the coil or core, reducing physical damage, and ensuring the reliability of the structure.

[0022] 4. In this utility model, the distance between the protrusion of the wedge-shaped self-locking pressure block and the magnetic pole coil is 8-15mm, which meets the insulation requirements of the magnetic pole coil to ground.

[0023] 5. In this utility model, the wedge-shaped self-locking block is flush with the inner surface of the magnetic pole core. After the magnetic pole is installed, the wedge-shaped self-locking block is in direct contact with the magnetic yoke, and the force transmitted from the outer diameter side is directly transmitted to the magnetic yoke, reducing the stress on the bolt.

[0024] 6. In this utility model, the magnetic pole core and the outer surface of the magnetic yoke form a wedge-shaped gap with a smaller outer diameter and a larger inner diameter. The cross-section of the wedge-shaped self-locking block is the same as that of the wedge-shaped block, which ensures that the wedge-shaped block will not come out under any circumstances, thus improving the safety of the magnetic pole.

[0025] 7. In this utility model, the bolt hole in the countersunk hole of the wedge-shaped self-locking block is coaxially set with the threaded hole on the magnetic pole core, which ensures installation accuracy, improves the reliability of bolt assembly and the fixing strength of the wedge-shaped self-locking block, reduces bolt stress concentration caused by hole position offset during installation, and extends service life.

[0026] 8. In this utility model, the length of the protrusion is not less than the thickness of the electrode insulation plate, which ensures that the protrusion applies a uniform force to the electrode insulation plate. It will not cause insufficient clamping force due to being too short, nor will it cause additional stress concentration or deformation due to being too long.

[0027] 9. In this utility model, the protruding surface of the wedge-shaped self-locking pressure block is provided with anti-slip texture, which increases the friction between the wedge-shaped self-locking pressure block and the electrode body insulation plate, further restricts the movement of the electrode body insulation plate, reduces the risk of failure caused by surface slippage under vibration environment, improves structural reliability, and the wedge-shaped self-locking pressure block is provided with a corrosion-resistant coating to extend its service life.

[0028] 10. In this utility model, the magnetic pole body insulation plate is provided with a notch that cooperates with the wedge-shaped self-locking block, which can effectively prevent abnormal movement of the magnetic pole body insulation plate.

[0029] 11. In this utility model, the front end of the threaded hole is a smooth hole, which can effectively lengthen the flexible section of the locking bolt and avoid excessive local stress in the locking bolt. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structural layout of this utility model;

[0031] Figure 2 for Figure 1 Enlarged view of a portion of region P in the middle;

[0032] Figure 3 for Figure 2 Diagram showing direction A in the middle;

[0033] Figure 4 for Figure 2 Diagram of the B-direction;

[0034] Marked in the image:

[0035] 1. Magnetic pole coil; 2. Locking bolt; 3. Locking washer; 4. Wedge-shaped self-locking block; 5. Magnetic pole core; 6. Pole body insulation plate. Detailed Implementation

[0036] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] Example 1

[0038] As the most basic embodiment of this utility model, refer to Figure 1A pole body insulation fixing structure for a hydro-generator magnetic pole coil includes a pole body insulation plate 6 disposed between a magnetic pole core 5 and a magnetic pole coil 1. A wedge-shaped self-locking block 4 is fixed to the magnetic pole core 5 by locking bolts 2. The wedge-shaped self-locking block has several countersunk holes on its inclined surface, and bolt holes are provided in the countersunk holes. Corresponding threaded holes are provided on the magnetic pole core 5. The locking bolts 2 pass through the bolt holes and threaded holes to fix the wedge-shaped self-locking block to the magnetic pole core 5. A stop washer 3 is provided between the head of the locking bolt 2 and the wedge-shaped self-locking block; the inclined surface of the wedge-shaped self-locking block 4 is in reliable contact with the surface of the magnetic pole core 5, and the wedge-shaped self-locking block 4 is perpendicular to the pole body insulating plate 6; the wedge-shaped self-locking block 4 includes a locking part that contacts the magnetic pole core 5 and a protruding part that protrudes out of the magnetic pole core 5, and one end of the pole body insulating plate 6 is provided with a notch that cooperates with the wedge-shaped self-locking block 4 and abuts against the protruding part of the wedge-shaped self-locking block 4.

[0039] This embodiment improves the overall stability of the structure, while the locking washer effectively prevents the bolts from loosening and enhances the reliability of the locking.

[0040] Example 2

[0041] As another preferred embodiment of this utility model, this embodiment is a further detailed supplement and explanation of the technical solution of this utility model based on the above-described embodiment 1. (Refer to...) Figure 1 In this embodiment, the surface of the pole body insulating plate 6 that contacts the magnetic pole core 5 is provided with embedded protrusions, and the magnetic pole core 5 is provided with holes that cooperate with the embedded protrusions. The embedded protrusions are embedded in the holes of the magnetic pole core 5 to reduce movement. The distance between the protrusion of the wedge-shaped self-locking block 4 and the magnetic pole coil 1 is 8-15mm.

[0042] This embodiment can prevent the insulation plate from shifting or misaligning due to mechanical vibration, thereby ensuring the insulation effect and long-term reliability. Furthermore, the distance between the protrusion of the wedge-shaped self-locking block and the magnetic pole coil is 8-15mm, which meets the insulation requirements of the magnetic pole coil to ground.

[0043] Example 3

[0044] As another preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above embodiment 2. In this embodiment, one side of the pole body insulating plate 6 is fixed to the magnetic pole core 5 by adhesive-impregnated felt, and the other side is in smooth contact with the magnetic pole coil 1.

[0045] Example 4

[0046] As another preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above embodiment 2. In this embodiment, one side of the pole body insulating plate 6 is fixed to the magnetic pole coil 1 by adhesive-impregnated felt, and the other side is in smooth contact with the magnetic pole core 5.

[0047] Example 5

[0048] As another preferred embodiment of this utility model, this embodiment is a further detailed supplement and explanation of the technical solution of this utility model based on the above-described embodiment 4. (Refer to...) Figure 1 In this embodiment, two countersunk holes are provided, and the countersunk holes are symmetrically arranged on the inclined surface of the wedge-shaped self-locking pressure block 4.

[0049] In this embodiment, the firmness of the wedge-shaped self-locking block 4 is ensured while also taking into account the uniformity of the force distribution of the fixed structure.

[0050] Example 6

[0051] As another preferred embodiment of this utility model, this embodiment is a further detailed supplement and explanation of the technical solution of this utility model based on the above-described embodiment 5. (Refer to...) Figure 1 In this embodiment, the bolt hole in the countersunk hole of the wedge-shaped self-locking pressure block is coaxially arranged with the blind hole on the magnetic pole core 5; the length of the protrusion is not less than the thickness of the pole body insulation plate, and is 10-15mm. In this embodiment, the length of the protrusion is 15mm.

[0052] In this embodiment, the installation accuracy and force uniformity of the locking bolt 2 are ensured, thereby improving the stability and service life of the fixed structure.

[0053] Example 7

[0054] As the preferred embodiment of this utility model, this embodiment is a further detailed supplement and explanation of the technical solution of this utility model based on the above-described embodiment 6. (Refer to...) Figure 1 In this embodiment, the protruding surface of the wedge-shaped self-locking block is provided with anti-slip texture, the wedge-shaped self-locking block is provided with a corrosion-resistant coating, and the wedge-shaped self-locking block is made of high-strength materials such as steel and aluminum alloy.

[0055] This embodiment ensures that the wedge-shaped self-locking block can still achieve stable, insulating, and long-lasting fixing effects in humid, high-vibration, and high-temperature environments, significantly improving the safety, reliability, and service life of the entire structure.

Claims

1. A pole body insulation fixing structure for a hydro-generator magnetic pole coil, comprising a pole body insulation plate (6) disposed between the magnetic pole core (5) and the magnetic pole coil (1), characterized in that: A wedge-shaped self-locking block (4) is fixed to the magnetic pole core (5) by a locking bolt (2). Several countersunk holes are provided on the inclined surface of the wedge-shaped self-locking block, and bolt holes are provided within these countersunk holes. Corresponding threaded holes are provided on the magnetic pole core (5). The locking bolt (2) passes through the bolt holes and blind holes to fix the wedge-shaped self-locking block to the magnetic pole core (5). A stop washer (3) is provided between the head of the locking bolt (2) and the wedge-shaped self-locking block. 4) The inclined surface of the pressure block contacts the surface of the magnetic pole core (5) and the wedge-shaped self-locking pressure block (4) is not higher than the inner surface of the magnetic pole core (5) after installation. The wedge-shaped self-locking pressure block (4) is perpendicular to the pole body insulation plate (6). The wedge-shaped self-locking pressure block (4) includes a locking part that contacts the magnetic pole core (5) and a protruding part that protrudes out of the magnetic pole core (5). One end of the pole body insulation plate (6) is provided with a notch that cooperates with the wedge-shaped self-locking pressure block (4) and abuts against the protruding part of the wedge-shaped self-locking pressure block (4).

2. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The surface of the pole body insulating plate (6) that contacts the magnetic pole core (5) is provided with embedded protrusions. The magnetic pole core (5) is provided with holes that cooperate with the embedded protrusions. The embedded protrusions are embedded in the holes of the magnetic pole core (5) to reduce movement.

3. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The pole body insulation plate (6) is fixed to the magnetic pole core (5) on one side by adhesive-impregnated felt, and the other side is in smooth contact with the magnetic pole coil (1).

4. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The pole body insulation plate (6) is fixed to the magnetic pole coil (1) on one side by adhesive felt, and the other side is in smooth contact with the magnetic pole core (5).

5. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to any one of claims 1-3, characterized in that: The distance between the protrusion of the wedge-shaped self-locking block (4) and the magnetic pole coil (1) is 8-15mm.

6. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 5, characterized in that: At least one countersunk hole is provided.

7. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 6, characterized in that: The countersunk holes are symmetrically arranged on the inclined surface of the wedge-shaped self-locking pressure block (4).

8. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 1, characterized in that: The bolt hole in the countersunk hole of the wedge-shaped self-locking block is coaxially set with the threaded hole on the magnetic pole core (5), and the front end of the threaded hole is set as a smooth hole.

9. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 7, characterized in that: The length of the protrusion is not less than the thickness of the electrode insulation plate.

10. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 9, characterized in that: The protruding part of the wedge-shaped self-locking pressure block has an anti-slip texture.

11. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 10, characterized in that: The wedge-shaped self-locking pressure block is covered with a corrosion-resistant coating.

12. The insulation fixing structure for the magnetic pole coil of a hydro-generator according to claim 11, characterized in that: The wedge-shaped self-locking pressure block is made of steel or aluminum alloy.

Images