CN220544752U - Insulating optimization stator core penetrating screw rod of hydraulic generator - Google Patents
Insulating optimization stator core penetrating screw rod of hydraulic generator Download PDFInfo
- Publication number
- CN220544752U CN220544752U CN202321803237.4U CN202321803237U CN220544752U CN 220544752 U CN220544752 U CN 220544752U CN 202321803237 U CN202321803237 U CN 202321803237U CN 220544752 U CN220544752 U CN 220544752U
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- Prior art keywords
- penetrating screw
- stator core
- insulation
- core
- insulating
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- 230000000149 penetrating effect Effects 0.000 title claims abstract description 68
- 238000005457 optimization Methods 0.000 title claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 44
- 238000003475 lamination Methods 0.000 claims abstract description 39
- 239000011810 insulating material Substances 0.000 claims abstract description 15
- 238000005498 polishing Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 9
- 238000009423 ventilation Methods 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000003973 paint Substances 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 210000003298 dental enamel Anatomy 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 230000007774 longterm Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The utility model discloses an insulation optimized stator core penetrating screw rod of a hydraulic generator, which comprises a core penetrating screw rod assembly used for penetrating stator core lamination, wherein the core penetrating screw rod assembly comprises a core penetrating screw rod body, an insulation sleeve and a nut, the insulation sleeve is sleeved on the core penetrating screw rod body, the core penetrating screw rod body penetrates through a mounting hole on the stator core lamination, and the stator core lamination is clamped and locked by the nuts at two ends of the core penetrating screw rod body; the surface of the inner part of the insulating sleeve, which is positioned on the core penetrating screw body, is provided with an insulating layer which is formed by winding and polishing insulating material strips. According to the utility model, the insulating layer formed by winding and polishing the insulating material strip is arranged on the surface of the inner part of the insulating sleeve of the core penetrating screw body, so that the insulating optimization of the core penetrating screw is realized, the insulating performance of the core penetrating screw can be effectively enhanced, the short circuit between the core penetrating screw and the stator core caused by pollutants attached to the insulating sleeve is prevented, and the reliability of the generator is improved.
Description
Technical Field
The utility model belongs to hydraulic generator equipment, and particularly relates to a hydraulic generator insulation optimization stator core penetrating screw rod.
Background
The stator core penetrating screw rod is a main fixing piece for directly contacting an iron core and a metal outer member in the hydraulic generator, the core penetrating screw rod penetrates through the iron core, and a certain gap exists between the iron core and the core penetrating screw rod. The main causes of the reduced insulation of the through-screw are: when the machine set operates, carbon powder generated by a carbon brush of a collecting ring of a generator rotor and metal dust generated by a mechanical braking device of the generator when the machine set brakes and stops are sucked into the generator and attached to the stator and the rotor; and the oil mist generated by the combined bearing in operation due to the increase of the oil temperature is sealed into the stator nacelle through the end cover on the upstream side of the bearing. The two main pollutants are finally attached to the insulating sleeve through the gap between the iron core and the core penetrating screw rod, the insulation of the core penetrating screw rod is affected, and the short circuit between the core penetrating screw rod and the stator iron core can be caused when the insulation of the core penetrating screw rod is severe, so that the safe operation of the generator is greatly threatened.
Disclosure of Invention
The utility model aims to solve the technical problems: according to the utility model, the insulating layer formed by winding and polishing the insulating material strips is arranged on the surface of the inner part of the insulating sleeve of the core penetrating screw body, so that the insulating property of the core penetrating screw can be effectively enhanced, the short circuit between the core penetrating screw and a stator core caused by pollutants attached to the insulating sleeve is prevented, and the reliability of the generator is improved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a hydraulic generator insulation optimization stator wears core screw rod, includes the core screw rod subassembly that wears that is used for running through stator core lamination, wear core screw rod subassembly including wearing core screw rod body, insulating sleeve and nut, insulating sleeve cover is located on wearing core screw rod body, wear core screw rod body and run through the mounting hole on the stator core lamination and both ends pass through the nut and hold the stator core lamination centre gripping locking; the surface of the inner part of the insulating sleeve, which is positioned on the core penetrating screw body, is provided with an insulating layer which is formed by winding and polishing insulating material strips.
Optionally, the insulating material tape is a impregnated alkali-free glass ribbon.
Optionally, the surface of the insulating layer is coated with an insulating paint.
Optionally, the insulating paint is epoxy enamel.
Optionally, a ventilation slot plate for cooling is further arranged on the outer side of the stator core lamination, and the core penetrating screw assembly penetrates through the ventilation slot plate.
Optionally, a positioning ring protruding along the radial direction is arranged on the outer wall of the insulating sleeve, and the stator core lamination and the ventilation slot plate clamp the positioning ring to form a ventilation gap between the stator core lamination and the ventilation slot plate.
Optionally, the stator core lamination is located the outside of ventilation frid and still is equipped with the tooth pressure plate that fixed stator core lamination was used, the core screw rod subassembly that wears runs through tooth pressure plate and arranges.
Optionally, a metal washer and an insulating washer are sequentially sleeved on the inner side of the nut on the core-penetrating screw body, and the insulating washer is contacted with the end part of the insulating sleeve to form a continuous insulating structure.
Optionally, the inner side of the insulating washer on the core-penetrating screw body is further sleeved with a pressing plate, a disc spring and a supporting plate in sequence, and the nut is pressed on the outer wall of the tooth pressing plate through the metal washer, the insulating washer, the pressing plate, the disc spring and the supporting plate in sequence.
Optionally, one side of tooth pressure plate still is equipped with the riding block, install the location muscle that is used for carrying out vertical location to stator core lamination between the riding block at stator core lamination both ends.
Compared with the prior art, the utility model has the following advantages: the utility model comprises a core penetrating screw assembly for penetrating the stator core lamination, wherein an insulating layer formed by polishing after winding an insulating material belt is arranged on the surface of the inner part of the insulating sleeve of the core penetrating screw body, and the insulating layer formed by polishing after winding the insulating material belt is arranged on the surface of the inner part of the insulating sleeve of the core penetrating screw body, so that the insulating optimization of the core penetrating screw is realized, the insulating performance of the core penetrating screw can be effectively enhanced, the short circuit between the core penetrating screw and the stator core caused by pollutants attached to the insulating sleeve is prevented, and the reliability of the generator is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Legend description: 1. stator core lamination; 11. a ventilation slot plate; 12. a tooth pressing plate; 13. a support block; 14. positioning ribs; 2. a core-through screw assembly; 21. a core penetrating screw body; 22. an insulating sleeve; 221. a positioning ring; 23. a nut; 24. a metal gasket; 25. an insulating gasket; 26. a pressing plate; 27. a belleville spring; 28. and a supporting plate.
Detailed Description
As shown in fig. 1, the insulation optimized stator core penetrating screw of the hydraulic generator in the embodiment comprises a core penetrating screw assembly 2 for penetrating through a stator core lamination 1, wherein the core penetrating screw assembly 2 comprises a core penetrating screw body 21, an insulation sleeve 22 and a nut 23, the insulation sleeve 22 is sleeved on the core penetrating screw body 21, the core penetrating screw body 21 penetrates through a mounting hole on the stator core lamination 1, and the stator core lamination 1 is clamped and locked by the nuts 23 at two ends; the insulating layer formed by polishing after the insulating material strip is wound is arranged on the surface of the inner part of the insulating sleeve 22 of the core penetrating screw body 21, the insulating layer formed by polishing after the insulating material strip is wound is arranged on the surface of the inner part of the insulating sleeve of the core penetrating screw body, so that the insulating optimization of the core penetrating screw is realized, the insulating performance of the core penetrating screw can be effectively enhanced, the short circuit between the core penetrating screw and a stator core caused by pollutants attached to the insulating sleeve is prevented, and the reliability of the generator is improved.
The insulation structure of the core-penetrating screw body 21 is optimized, and the insulation structure comprises the steps of properly reducing the diameter of a polish rod section (the inner part of the insulation sleeve 22) of the core-penetrating screw body 21 on the premise of not changing the overall size of the core-penetrating screw body 21, increasing the insulation of the polish rod section of the core-penetrating screw body 21, and ensuring that dust or greasy dirt and the like existing between the screw and the iron core cannot influence the insulation. In addition, in order to ensure the possible strength reduction caused by the size reduction, the embodiment further comprises selecting high-quality materials to optimize the strength, specifically selecting 42CrMo high-strength modulated silver bright round steel, wherein the tensile strength of the materials is more than 900Mpa, and the yield strength is more than 735Mpa; the diameter of the original core-penetrating screw rod is reduced to 10.8mm, and the same structural strength can be maintained.
The insulating material strips may be made of a desired insulating material as desired, for example, as an alternative embodiment, the insulating material strips in this example are impregnated alkali-free glass filaments. And winding a gum dipping alkali-free glass ribbon on the polished rod section of the screw rod, and polishing and shaping the surface of the insulating layer after thoroughly drying to ensure that the overall size does not exceed the original size.
In addition, in order to further enhance the insulation performance of the core penetrating screw, the short circuit between the core penetrating screw and the stator core caused by the pollutants attached to the insulating sleeve is prevented, and as an alternative implementation mode, the surface of the insulating layer in the embodiment is coated with insulating paint. Needless to say, the insulating paint may be of a desired kind as required, for example, the insulating paint in this embodiment is an epoxy enamel. After the full insulation treatment of the penetrating screw, the diameter of the screw is at the minimum position of the screw end thread section, the diameter of the screw wrapping the insulating layer is smaller than that of the screw thread section, and through verification, the tensile stress, the strength and the insulating performance of the screw all meet the compression requirement of a stator iron core and the safe operation requirement of a unit, and the old T-shaped insulating sleeve cannot damage the screw insulating layer.
As shown in fig. 1, in this embodiment, a ventilation slot plate 11 for cooling is further provided on the outer side of the stator core lamination sheet 1, and the through-core screw assembly 2 is disposed through the ventilation slot plate 11, and an air duct can be formed between the stator core lamination sheets 1 through the ventilation slot plate 11, thereby facilitating heat dissipation of the hydraulic generator.
As shown in fig. 1, in this embodiment, the outer wall of the insulating sleeve 22 is provided with a positioning ring 221 protruding along the radial direction, and the stator core lamination 1 and the ventilation slot plate 11 clamp the positioning ring 221 to form a ventilation gap between the stator core lamination 1 and the ventilation slot plate 11, so that the heat dissipation effect is better.
As shown in fig. 1, in this embodiment, the stator core lamination 1 is further provided with a tooth pressing plate 12 for fixing the stator core lamination 1, and the core penetrating screw assembly 2 is disposed through the tooth pressing plate 12, which is located at the outer side of the ventilation slot plate 11. The tooth pressing plate 12 is provided with a rack for pressing the stator core lamination 1, so that the stator core lamination 1 is firmly and stably installed.
As shown in fig. 1, in this embodiment, a metal washer 24 and an insulating washer 25 are sequentially sleeved on the inner side of the nut 23 on the core-penetrating screw body 21, and the ends of the insulating washer 25 and the insulating sleeve 22 are contacted to form a continuous insulating structure.
As shown in fig. 1, in this embodiment, a pressing plate 26, a belleville spring 27 and a supporting plate 28 are sequentially sleeved on the inner side of the insulating washer 25 on the core-penetrating screw body 21, and the nut 23 is pressed on the outer wall of the tooth pressing plate 12 sequentially through the metal washer 24, the insulating washer 25, the pressing plate 26, the belleville spring 27 and the supporting plate 28.
As shown in fig. 1, in this embodiment, a supporting block 13 is further disposed on one side of the tooth pressing plate 12, and positioning ribs 14 for longitudinally positioning the stator core lamination 1 are installed between the supporting blocks 13 at two ends of the stator core lamination 1, so that the radial and roundness control of the stator core lamination 1 can be controlled.
In summary, a loop is formed between the screw and the stator core for long-term operation of the generator, so that circulation is generated, the core is heated, insulation between the core sheets is damaged, insulation of the stator bar is finally damaged, and short-circuit current is generated in the screw due to two-point grounding of the core penetrating screw, so that screw fusing accidents are caused, and the safety of the generator is seriously threatened. The hydraulic generator insulation optimization stator core-penetrating screw in this embodiment is applicable to the hydraulic generator and improves the stator through the core-penetrating screw after overhauling, can avoid receiving all kinds of factors to influence because of the generator long-term operation and lead to stator core-penetrating screw insulation to reduce, through being equipped with the insulating layer that forms through polishing after winding by the insulating material area on the surface that core-penetrating screw body 21 is located insulating sleeve 22 inside part, the insulating optimization of core-penetrating screw has been realized, can effectively strengthen the insulating properties of core-penetrating screw, prevent that insulating sleeve attached pollutant from causing core-penetrating screw and stator core short circuit, promote the reliability of generator, ensure that screw tensile stress, intensity, insulating properties all satisfy stator core and compress tightly needs and the long-term safe operation requirement of unit. The through-core screw rod is designed to realize a full insulation structure, so that the influence of insulation reduction between the long-term running iron core of the generator and the screw rod due to dust or damp on the running safety of the generator is avoided; and the implementation is simple and convenient, the iron core is not required to be disassembled during operation, so that the maintenance efficiency is improved, and the economic benefit of the power plant is also improved.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (10)
1. The insulation optimization stator core penetrating screw of the hydraulic generator is characterized by comprising a core penetrating screw assembly (2) for penetrating through stator core lamination (1), wherein the core penetrating screw assembly (2) comprises a core penetrating screw body (21), an insulating sleeve (22) and a nut (23), the insulating sleeve (22) is sleeved on the core penetrating screw body (21), the core penetrating screw body (21) penetrates through a mounting hole on the stator core lamination (1), and the stator core lamination (1) is clamped and locked by the nuts (23) at two ends; the surface of the inner part of the insulating sleeve (22) of the core-penetrating screw body (21) is provided with an insulating layer formed by winding and polishing an insulating material belt.
2. The hydro-generator insulation optimized stator core-penetrating screw of claim 1, wherein the insulating material strip is a rubberized alkali-free glass ribbon.
3. The hydro-generator insulation optimized stator core-through screw of claim 2, wherein a surface of the insulation layer is coated with an insulation paint.
4. The hydro-generator insulation optimized stator core-through screw of claim 3, wherein the insulation paint is an epoxy enamel.
5. The insulation optimized stator core penetrating screw of a hydro-generator according to claim 4, wherein the outer side of the stator core lamination (1) is further provided with a ventilation slot plate (11) for cooling, and the core penetrating screw assembly (2) penetrates through the ventilation slot plate (11).
6. The insulation optimized stator core penetrating screw of the hydro-generator according to claim 5, wherein a positioning ring (221) protruding along the radial direction is arranged on the outer wall of the insulation sleeve (22), and the stator core lamination (1) and the ventilation slot plate (11) clamp the positioning ring (221) therein to form a ventilation gap between the stator core lamination (1) and the ventilation slot plate (11).
7. The insulation optimized stator core penetrating screw rod of the hydraulic generator according to claim 4, wherein the stator core lamination (1) is further provided with a tooth pressing plate (12) for fixing the stator core lamination (1) on the outer side of the ventilation slot plate (11), and the core penetrating screw rod assembly (2) penetrates through the tooth pressing plate (12).
8. The insulation optimized stator core penetrating screw of the hydro-generator according to claim 7, wherein a metal washer (24) and an insulation washer (25) are sequentially sleeved on the inner side of the nut (23) on the core penetrating screw body (21), and the insulation washer (25) is contacted with the end part of the insulation sleeve (22) to form a continuous insulation structure.
9. The insulation optimization stator core-penetrating screw of the hydraulic generator according to claim 8, wherein a pressing plate (26), a disc spring (27) and a supporting plate (28) are sequentially sleeved on the inner side of the insulation gasket (25) on the core-penetrating screw body (21), and the nut (23) is sequentially pressed on the outer wall of the tooth pressing plate (12) through the metal gasket (24), the insulation gasket (25), the pressing plate (26), the disc spring (27) and the supporting plate (28).
10. The insulation optimized stator core penetrating screw rod of the hydro-generator according to claim 9, wherein one side of the tooth pressing plate (12) is further provided with a supporting block (13), and positioning ribs (14) for longitudinally positioning the stator core lamination (1) are arranged between the supporting blocks (13) at two ends of the stator core lamination (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321803237.4U CN220544752U (en) | 2023-07-10 | 2023-07-10 | Insulating optimization stator core penetrating screw rod of hydraulic generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321803237.4U CN220544752U (en) | 2023-07-10 | 2023-07-10 | Insulating optimization stator core penetrating screw rod of hydraulic generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220544752U true CN220544752U (en) | 2024-02-27 |
Family
ID=89968619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321803237.4U Active CN220544752U (en) | 2023-07-10 | 2023-07-10 | Insulating optimization stator core penetrating screw rod of hydraulic generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220544752U (en) |
-
2023
- 2023-07-10 CN CN202321803237.4U patent/CN220544752U/en active Active
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