Insulation structure for end head of core-penetrating screw of stator core of hydro-generator
By adding a sealing ring to the insulating structure of the stator core screw end of the hydraulic generator, a sealing space is formed, which solves the problems of insulation failure and high manufacturing costs, and improves environmental adaptability and reduces costs.
Patent Information
- Application Number
- CN202411360488.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-02-14
AI Technical Summary
The insulating structure of the stator core screw end of the existing hydraulic turbine generator is difficult to isolate moisture and dirt in a humid environment, resulting in failure of the insulation of the core screw, and it is difficult to form standard parts in the insulating structure, which is high in manufacturing costs.
The insulating structure of the stator core threaded screw end head is added to form a sealing space to avoid dirt and moisture entering, and the insulating structure can be optimized so that it can be designed as standard structural parts for mass production.
It effectively avoids insulation failure accidents caused by dirt and moisture, improves the environmental adaptability of the generator, and reduces manufacturing costs.
Smart Images
Figure CN119448633A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of stator cores, and in particular relates to an insulating structure of a screw end of a stator core of a hydro-generator. Background Art
[0002] The structure of using through-core screws to compress the stator core of large-scale hydro-turbine generator sets is widely adopted, and the through-core screws and stator core must be insulated. Figure 2 The insulating nut in the device completely covers the disc spring and the sleeve.
[0003] The existing insulation structure has the following problems:
[0004] Since the operating environment of the hydropower station is relatively humid, the existing structure cannot effectively isolate moisture and dirt, which can easily lead to failure of the insulation of the through screw to the ground and cause accidents.
[0005] Since the disc spring configurations of different generators are often different, the insulating caps of the insulating structure can only be customized, which is difficult to form standard parts and has high manufacturing costs. Summary of the invention
[0006] In order to solve the above problems existing in the prior art, the object of the present invention is to provide an insulation structure for the end of a stator core through-core screw of a hydro-generator.
[0007] The technical solution adopted by the present invention is:
[0008] The invention discloses an insulating structure for the end of a through-screw rod of a stator core of a hydro-turbine generator, comprising a through-screw rod connected to the stator core, a thin nut and a round nut being threadedly connected to the through-screw rod, and an insulating sleeve being sleeved on the through-screw rod; an insulating cap being connected to an insulating washer, and the insulating washer being sleeved on the insulating sleeve; the thin nut, the round nut, the steel washer and the end of the through-screw rod are arranged in a space surrounded by the insulating cap and the insulating washer, and a sealing ring is arranged between the insulating washer and the insulating sleeve; a sleeve is also sleeved on the insulating sleeve, and the sleeve is located between the insulating washer and the stator core, and a disc spring is sleeved on the sleeve, and the disc spring is pressed tightly between the sleeve and the stator core.
[0009] The present invention adds a sealing ring or a similar sealing element on the basis of the existing generator stator core through-core screw end insulation structure, so that the existing generator stator core through-core screw end insulation structure forms a sealed space, which can effectively prevent dirt and moisture from entering the space and causing the generator stator core through-core screw insulation failure accident, so that the environmental adaptability of the generator is effectively improved.
[0010] As a preferred embodiment of the present invention, a sealing groove with a triangular cross section is provided on the lower side of the insulating gasket, and the cross section of the sealing ring after compression is triangular. The sealing ring is arranged in the sealing groove, and the inner side of the sealing ring is pressed tightly against the insulating sleeve, and the lower side of the sealing ring is pressed tightly against the sleeve. The sealing ring with a triangular cross section can be pressed tightly against the insulating gasket, the insulating sleeve and the sleeve respectively, to ensure reliable sealing and prevent dirt and moisture from entering the sealed space.
[0011] As a preferred solution of the present invention, a steel washer is sleeved on the through-screw rod, and the steel washer is pressed tightly between the insulating washer and the round nut.
[0012] As a preferred solution of the present invention, the through-core screw, thin nut, round nut and insulating sleeve are all standard parts.
[0013] As a preferred solution of the present invention, the insulating cap, steel washer, insulating washer and sealing ring are all of standard design.
[0014] The present invention optimizes the insulation structure of the existing generator stator core through-screw end head. The closed insulation space formed by the insulation cap, insulation gasket, sealing ring and insulation sleeve is independent of the sleeve and disc spring, and can be designed as a standard structural part for mass production to reduce costs.
[0015] As a preferred solution of the present invention, a compression washer is arranged between the disc spring and the stator core. The compression washer can reliably support the disc spring and improve the stability of the disc spring after compression.
[0016] As a preferred solution of the present invention, the sleeve includes an integrally formed end ring plate and an isolating tube, the insulating pad is pressed against the end ring plate, and the disc spring is sleeved on the isolating tube. The end ring plate and the pressing washer can well support the disc spring.
[0017] As a preferred solution of the present invention, the compression washer is sleeved on the isolation sleeve, and a gap is left between the lower end of the isolation sleeve and the stator core. When the disc spring is compressed, a gap is still left between the lower end of the isolation sleeve and the stator core to ensure that the sleeve has sufficient expansion space.
[0018] As a preferred embodiment of the present invention, the insulating cap, insulating gasket, insulating sleeve and sealing ring also form a central closed cavity, and the end of the through-screw, thin nut, round nut and steel gasket are all arranged in the central cavity.
[0019] As a preferred solution of the present invention, a top cap is provided on the insulating cap, and the end of the through-core screw extends into the top cap.
[0020] The beneficial effects of the present invention are:
[0021] 1. The present invention adds a sealing ring or a similar sealing element on the basis of the existing generator stator core through-core screw end insulation structure, so that the existing generator stator core through-core screw end insulation structure forms a sealed space, which can effectively prevent dirt and moisture from entering the space and causing the generator stator core through-core screw insulation failure accident. The environmental adaptability of the generator is effectively improved.
[0022] 2. The present invention optimizes the insulation structure of the existing generator stator core through-screw end. The closed insulation space formed by the insulation cap, insulation gasket, sealing ring and insulation sleeve is independent of the sleeve and disc spring, and can be designed as a standard structural part for mass production to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the structure of the present invention;
[0024] Figure 2 It is a schematic diagram of the existing stator core through-screw end insulation structure.
[0025] In the figure: 1- stator core; 2- through screw; 3- thin nut; 4- round nut; 5- insulating sleeve; 6- insulating cap; 7- insulating gasket; 8- sealing ring; 9- sleeve; 10- disc spring; 11- steel washer; 12- compression washer. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.
[0028] like Figure 1As shown, the stator core through-screw end insulation structure of the hydro-turbine generator in this embodiment comprises a through-screw 2 connected to the stator core 1, a thin nut 3 and a round nut 4 are threadedly connected to the through-screw 2, and an insulating sleeve 5 is sleeved on the through-screw 2; it also comprises an insulating cap 6, the insulating cap 6 is connected to an insulating washer 7, the insulating washer 7 is sleeved on the insulating sleeve 5, the thin nut 3, the round nut 4 and the end of the through-screw 2 are arranged in a space surrounded by the insulating cap 6 and the insulating washer 7, and a sealing ring 8 is arranged between the insulating washer 7 and the insulating sleeve 5; the insulating sleeve 5 is also sleeved with a sleeve 9, the sleeve 9 is located between the insulating washer 7 and the stator core 1, and the sleeve 9 is sleeved with a disc spring 10, which is pressed between the sleeve 9 and the stator core 1. The through-screw 2 is sleeved with a steel washer 11, which is pressed between the insulating washer 7 and the round nut 4.
[0029] The present invention adds a sealing ring 8 or a similar sealing element on the basis of the existing insulation structure of the end of the through-core screw 2 of the stator core 1 of the generator, so that the insulation structure of the end of the through-core screw 2 of the stator core 1 of the generator forms a sealed space, which can effectively prevent dirt and moisture from entering the space and causing insulation failure accidents of the through-core screw 2 of the stator core 1 of the generator, so that the environmental adaptability of the generator is effectively improved.
[0030] The lower side of the insulating gasket 7 is provided with a sealing groove with a triangular cross section, the sealing ring 8 has a triangular cross section after compression, the sealing ring 8 is arranged in the sealing groove, the inner side of the sealing ring 8 is pressed tightly against the insulating sleeve 5, and the lower side of the sealing ring 8 is pressed tightly against the sleeve 9. The sealing ring 8 with a triangular cross section can be pressed tightly against the insulating gasket 7, the insulating sleeve 5 and the sleeve 9 respectively, to ensure reliable sealing and prevent dirt and moisture from entering the sealed space.
[0031] Furthermore, the through-core screw 2, thin nut 3, round nut 4 and insulating sleeve 5 are all standard parts. The insulating cap 6, steel washer 11, insulating washer 7 and sealing ring 8 are all of standard design.
[0032] The present invention optimizes the insulation structure of the end of the existing generator stator core 1 through-core screw 2. The closed insulation space formed by the insulation cap 6, insulation gasket 7, sealing ring 8 and insulation sleeve 5 is independent of the sleeve and disc spring 10, and can be designed as a standard structural part for mass production to reduce costs.
[0033] Furthermore, a compression washer 12 is provided between the disc spring 10 and the stator core 1. The compression washer 12 can reliably support the disc spring 10 and improve the stability of the disc spring 10 after compression.
[0034] The sleeve includes an integrally formed end ring plate and an isolating tube, the insulating pad is pressed against the end ring plate, and the disc spring 10 is sleeved on the isolating tube. The end ring plate and the pressing washer 12 can support the disc spring 10 well.
[0035] The compression washer 12 is sleeved on the isolation tube, and a gap is left between the lower end of the isolation tube and the stator core 1. When the disc spring 10 is compressed, a gap is still left between the lower end of the isolation tube and the stator core 1 to ensure that the sleeve has enough expansion and contraction space.
[0036] The insulating cap 6, insulating gasket 7, insulating sleeve 5, and sealing ring 8 also form a central closed cavity, and the end of the through-core screw 2, the thin nut 3, the round nut 4, and the steel gasket 11 are all arranged in the central cavity.
[0037] The insulating cap 6 is provided with a top cap, and the end of the through-core screw 2 extends into the top cap.
[0038] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.
Claims
1. A hydro-generator stator core through-core screw end insulation structure, characterized in that: The invention comprises a through-hole screw (2) connected to a stator core (1), a thin nut (3) and a round nut (4) being threadedly connected to the through-hole screw (2), and an insulating sleeve (5) being sleeved on the through-hole screw (2); an insulating cap (6), the insulating cap (6) being connected to an insulating washer (7), the insulating washer (7) being sleeved on the insulating sleeve (5), the thin nut (3), the round nut (4), the steel washer (11) and the end of the through-hole screw (2) being arranged in a space surrounded by the insulating cap (6) and the insulating washer (7), and a sealing ring (8) being arranged between the insulating washer (7) and the insulating sleeve (5); a sleeve (9) being sleeved on the insulating sleeve (5), the sleeve (9) being located between the insulating washer (7) and the stator core (1), and a disc spring (10) being sleeved on the sleeve (9), and the disc spring (10) being pressed tightly between the sleeve (9) and the stator core (1).
2. The insulation structure of the end of the stator core through-core screw of a hydro-generator according to claim 1, characterized in that: A sealing groove with a triangular cross section is provided on the lower side of the insulating gasket (7); the cross section of the sealing ring (8) after compression is triangular; the sealing ring (8) is arranged in the sealing groove; the inner side of the sealing ring (8) is pressed tightly against the insulating sleeve (5); and the lower side of the sealing ring (8) is pressed tightly against the sleeve (9).
3. The insulation structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 1, characterized in that: The through-thread screw (2) is sleeved with a steel washer (11), which is pressed tightly between the insulating washer (7) and the round nut (4).
4. The insulating structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 3 is characterized in that: The through-core screw (2), thin nut (3), round nut (4) and insulating sleeve (5) are all standard parts.
5. The insulating structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 4, characterized in that: The insulating cap (6), steel washer (11), insulating washer (7) and sealing ring (8) are all of standard design.
6. The insulating structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 1, characterized in that: A compression washer (12) is provided between the disc spring (10) and the stator core (1).
7. The insulation structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 6, characterized in that: The sleeve comprises an end ring plate and an isolating tube which are integrally formed, the insulating pad is tightly pressed against the end ring plate, and the disc spring (10) is sleeved on the isolating tube.
8. The hydro-generator stator core through-core screw end insulation structure according to claim 7, characterized in that: The compression washer (12) is sleeved on the isolation cylinder, and a gap is left between the lower end of the isolation cylinder and the stator core (1).
9. The insulation structure of the end of the stator core through-the-core screw of a hydro-generator according to claim 3, characterized in that: The insulating cap (6), insulating gasket (7), insulating sleeve (5) and sealing ring (8) form a closed central cavity, and the end of the through-core screw (2), the thin nut (3), the round nut (4) and the steel gasket (11) are all arranged in the central cavity.
10. The insulation structure of the end of the stator core through-screw of a hydro-generator according to any one of claims 1 to 9, characterized in that: The insulating cap (6) is provided with a top cap, and the end of the through-core screw (2) extends into the top cap.