Fixing structure for stator coil of vacuum dip-coating steam turbine generator

Abstract

The utility model discloses a fixing structure of a vacuum paint dipping steam turbine generator stator coil, and belongs to the field of steam turbine generator stators. Comprises: a stator having a stator core slot; the stator coil is divided into an upper coil and a lower coil; the bracket is arranged on the stator; first filler strips are arranged on the upper and lower end faces of the inner wall of the stator core groove, one ends of the upper coil and the lower coil are inserted into the stator core groove and abut against the first filler strips, and a second filler strip is arranged between the upper coil and the lower coil; and first expansion cloth is arranged between the upper coil and the first filler strip. The fixing structure for the stator coil of the vacuum dip-coating steam turbine generator has the beneficial effect that a paint film is effectively locked by the fixing structure for the stator coil of the vacuum dip-coating steam turbine generator.

Description

Technical Field

[0001] The present application relates to the field of steam turbine generator stators, and in particular to a fixing structure for a vacuum-impregnated steam turbine generator stator coil. Background Art

[0002] The stator winding is the main component of the generator, which is the conductive element of the generator and an indispensable part for the generator to produce electromagnetic effects. Therefore, the stability of the stator coil plays a vital role in the safe and stable operation of the unit. The ends of the stator coil are traditionally fixed to the stator pressure plate with end hoops and bolts. Due to the irregular ends of the stator coil, it is difficult to fix them. When a short circuit occurs at the output end of the generator, the end of the wire rod will generate a strong electric force, and the stator coil is easy to loosen. Utility Model Content

[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0004] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a fixing structure of a stator coil of a vacuum impregnated steam turbine generator, including:

[0005] A stator having stator core slots;

[0006] The stator coil is divided into an upper coil and a lower coil;

[0007] A bracket, arranged on the stator;

[0008] A first gasket is provided on the upper and lower end surfaces of the inner wall of the stator core slot, one end of the upper coil and the lower coil is inserted into the stator core slot and abuts against the first gasket, a second gasket is provided between the upper coil and the lower coil; a first expansion cloth is provided between the upper coil and the first gasket.

[0009] The present application provides a plurality of expansion cloths at key positions of the stator coil, so that the expansion cloths play a better role in locking the paint film after vacuum pressure dipping, so that the fixed joint surface of the stator coil has no gap, greatly improving the mechanical strength of the stator end, and reducing the adverse effects caused by the vibration of the stator during operation.

[0010] Furthermore, a pad is installed between the upper coil and the lower coil, a second expansion cloth is provided on the contact surface of the upper coil, the lower coil and the pad, a first through hole is opened on the pad, and a polyester rope is passed through the first through hole to tie and fix the pad, the second expansion cloth, the upper coil and the lower coil together.

[0011] Furthermore, the middle section of the end of the stator coil is inclined; a number of stacked and spaced insulating sheets are provided on adjacent stator coils, a third expansion cloth is provided on the contact surface between the insulating sheet and the stator coil, and the insulating sheet, the stator coil and the third expansion cloth are tied and fixed together by a polyester rope.

[0012] Furthermore, a fourth expansion cloth is provided at the joint between the lower coil and the bracket, a pad is installed between the upper coil and the lower coil, and a fifth expansion cloth is provided on the contact surface between the pad and the upper coil and the lower coil; a plurality of evenly distributed second through holes are opened on the bracket, and a polyester rope is passed through the second through holes to tie and fix the upper coil, the lower coil, the fourth expansion cloth, the fifth expansion cloth, the pad and the bracket together.

[0013] Furthermore, the stator coil has a stator lead at the end away from the stator core slot, a sixth expansion cloth is installed outside the stator lead, a slot body for clamping the stator lead is provided on the bracket, and the stator lead and the sixth expansion cloth are fixed in the slot body by a polyester rope.

[0014] Furthermore, a pressing ring is provided between the stator and the bracket, a copper ring is provided on the pressing ring, and the copper ring covers the outer surface of the pressing ring, and the pressing ring and the copper ring are fixed by tightening bolts.

[0015] The beneficial effect of the present application is that it provides a fixing structure for the stator coil of a vacuum-impregnated steam turbine generator that effectively locks the paint film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0017] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements.

[0018] Schematically, components and elements are not necessarily drawn to scale.

[0019] In the attached picture:

[0020] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0021] Figure 2 yes Figure 1 Sectional view along AA;

[0022] Figure 3 yes Figure 1 Cross-sectional view along the middle line BB;

[0023] Figure 4 yes Figure 1 The view along the C direction;

[0024] Figure 5 yes Figure 1 Enlarged view of part A.

[0025] Reference numerals:

[0026] 1. Stator; 2. Stator coil; 3. Bracket; 4. Stator core slot; 5. Press ring; 6. Copper ring; 7. Tension bolt; 8. Upper coil; 9. Lower coil; 10. First gasket; 11. Second gasket; 12. First expansion cloth; 13. Pad; 14. Second expansion cloth; 15. First through hole; 16. Insulating sheet; 17. Third expansion cloth; 18. Fourth expansion cloth; 19. Gasket; 20. Fifth expansion cloth; 21. Second through hole; 22. Stator lead; 23. Sixth expansion cloth; 24. Slot; 25. Wafer rope. DETAILED DESCRIPTION

[0027] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0028] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0029] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0030] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0031] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] Reference Figure 1-5The fixed structure of the stator coil of the vacuum impregnated steam turbine generator includes a stator 1, a stator coil 2, and a bracket 3. After the stator coil 2 is embedded in the stator 1, the entire stator is vacuum pressure impregnated, so that the inside of the stator coil 2 and the bonding between the coil and the iron core can be made more solid, and the damping effect is good. The stator 1 has low vibration and low noise during operation. At the same time, a very uniform and dense insulating layer is formed on the surface of the stator coil 2. This insulating layer can effectively inhibit the corrosion of moisture and chemical substances, provide higher electrical insulation performance, small local discharge, and enhance the reliability and safety of the motor. The stator 1 has a stator core slot 4, and the bracket 3 is fixed on the stator 1. One end of the stator coil 2 is embedded in the stator core slot 4, and the other end is arranged on the bracket 3.

[0033] A pressing ring 5 is provided between the stator 1 and the bracket 3, and a copper ring 6 is provided on the pressing ring 5, and the copper ring 6 covers the outer surface of the pressing ring 5, and the pressing ring 5 and the copper ring 6 are fixed by tightening bolts 7. The good conductivity of the copper ring 6 is used to effectively prevent leakage magnetic flux from entering the inside of the pressing ring 5, thereby reducing the internal loss of the motor.

[0034] The stator coil 2 is divided into two layers, an upper coil 8 and a lower coil 9. A first gasket 10 is provided on the upper and lower end surfaces of the inner wall of the stator core slot 4. One end of the upper coil 8 and the lower coil 9 is inserted into the stator core slot 4 and abuts against the first gasket 10. A second gasket 11 is provided between the upper coil 8 and the lower coil 9. A first expansion fabric 12 is also provided between the upper coil 8 and the first gasket 10.

[0035] When the stator coil 2 is embedded in the stator core slot 4, the stator coil 2 at the position of the outer slot of the stator core slot 4 is a straight section. In order to facilitate the fixing of this section, the present application installs a cushion block 13 between the upper coil 8 and the lower coil 9, and a second expansion cloth 14 is provided on the contact surface of the upper coil 8, the lower coil 9 and the cushion block 13. A first through hole 15 is opened on the cushion block 13, and a polyester rope 25 is passed through the first through hole 15 to tie and fix the cushion block 13, the second expansion cloth 14, the upper coil 8 and the lower coil 9 together.

[0036] The middle section of the end of the stator coil 2 is inclined. Specifically, a plurality of insulating sheets 16 are stacked and spaced apart on adjacent stator coils 2, and a third expansion cloth 17 is provided on the contact surface between the insulating sheet 16 and the stator coil 2, and the insulating sheet 16, the stator coil 2 and the third expansion cloth 17 are tied and fixed together by a polyester rope 25.

[0037] A fourth expansion cloth 18 is provided at the contact point between the lower coil 9 and the bracket 3, a liner 19 is also installed between the upper coil 8 and the lower coil 9, and a fifth expansion cloth 20 is provided on the contact surface between the liner 19 and the upper coil 8 and the lower coil 9. The bracket 3 is provided with a plurality of evenly distributed second through holes 21, and a polyester rope 25 is passed through the second through holes 21 to tie and fix the upper coil 8, the lower coil 9, the fourth expansion cloth 18, the fifth expansion cloth 20, the liner 19 and the bracket 3 together.

[0038] The stator coil 2 has a stator 1 lead at the end away from the stator core slot 4, and a sixth expansion cloth 23 is installed outside the stator 1 lead. The bracket 3 is provided with a slot body 24 for clamping the stator 1 lead, and the stator 1 lead and the sixth expansion cloth 23 are fixed in the slot body 24 by a polyester rope 25.

[0039] Through the above arrangement, the present application provides a plurality of expansion cloths at key positions of the stator coil 2, and the expansion cloths are MD3017470 with a thickness of 2 mm. After the vacuum pressure varnishing, the expansion cloths play a better role in locking the paint film, so that the fixed joint surface of the stator coil 2 has no gap, greatly improving the mechanical strength of the stator end, and reducing the adverse effects caused by the vibration of the stator during operation.

[0040] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A vacuum-impregnated steam turbine generator stator coil fixing structure, characterized in that: include: A stator having stator core slots; The stator coil is divided into an upper coil and a lower coil; A bracket, arranged on the stator; A first gasket is provided on the upper and lower end surfaces of the inner wall of the stator core slot, one end of the upper coil and the lower coil is inserted into the stator core slot and abuts against the first gasket, a second gasket is provided between the upper coil and the lower coil; a first expansion cloth is provided between the upper coil and the first gasket.

2. The fixing structure of the stator coil of the vacuum impregnated steam turbine generator according to claim 1 is characterized in that: A pad is installed between the upper coil and the lower coil, a second expansion cloth is provided on the contact surface of the upper coil, the lower coil and the pad, a first through hole is opened on the pad, and a polyester rope is passed through the first through hole to tie and fix the pad, the second expansion cloth, the upper coil and the lower coil together.

3. The fixing structure of the stator coil of the vacuum impregnated steam turbine generator according to claim 1 is characterized in that: The middle section of the end of the stator coil is inclined; a plurality of insulating sheets stacked and spaced apart are provided on adjacent stator coils, a third expansion cloth is provided on the contact surface between the insulating sheet and the stator coil, and the insulating sheet, the stator coil and the third expansion cloth are tied and fixed together by a polyester rope.

4. The fixing structure of the stator coil of the vacuum impregnated steam turbine generator according to claim 1 is characterized in that: A fourth expansion cloth is provided at the joint between the lower coil and the bracket, a pad is installed between the upper coil and the lower coil, and a fifth expansion cloth is provided on the contact surface between the pad and the upper coil and the lower coil; a plurality of evenly distributed second through holes are opened on the bracket, and a polyester rope is passed through the second through holes to tie and fix the upper coil, the lower coil, the fourth expansion cloth, the fifth expansion cloth, the pad and the bracket together.

5. The fixing structure of the stator coil of the vacuum impregnated steam turbine generator according to claim 1 is characterized in that: The stator coil has a stator lead at the end away from the stator core slot, and a sixth expansion cloth is installed outside the stator lead. The bracket is provided with a slot body for clamping the stator lead, and the stator lead and the sixth expansion cloth are fixed in the slot body by a polyester rope.

6. The fixing structure of the stator coil of the vacuum impregnated steam turbine generator according to claim 1 is characterized in that: A pressing ring is arranged between the stator and the bracket, a copper ring is arranged on the pressing ring, and the copper ring covers the outer surface of the pressing ring, and the pressing ring and the copper ring are fixed by tightening bolts.

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