Top shaft insulation and measurement structure of impact type hydraulic generator

Abstract

The invention relates to the field of hydro-generators, and discloses an impact hydro-generator top shaft insulation and measurement structure which is composed of a top shaft, a sliding rotor, a shaft insulation structure, an insulation measurement structure and a fixing structure. Insulation between the top shaft and the sliding rotor is realized through the shaft insulation structure, insulation measurement between the top shaft and the sliding rotor is realized through the insulation measurement structure, and ground insulation and fixation of the insulation measurement structure are realized through the fixing structure. Insulation and measurement between the top shaft and the sliding rotor of the generator are realized, short circuit accidents caused by the fact that current generated by electromagnetic induction is transmitted to other parts of the generator set through the position are avoided, the insulation performance of the top shaft and the sliding rotor is monitored in real time through the insulation measurement loop, pre-judgment is performed in advance to avoid risks, and meanwhile, the insulation performance of the top shaft and the sliding rotor is improved. The insulation measurement structure is subjected to insulation fixing treatment, section and short circuit of an insulation loop at a high rotating speed are avoided, short circuit accidents of the unit are effectively avoided through the measures, and the operation stability and reliability of the unit are improved.

Description

Technical Field

[0001] The invention relates to the field of hydro-turbine generators, and in particular to an insulation and measurement structure for a top shaft of an impulse hydro-turbine generator. Background Art

[0002] When the hydro-generator is running, an induced current will be generated on the rotor under a strong electromagnetic field. It is necessary to effectively isolate this current from passing through the sliding rotor and the guide bearing bush, and connect it to the ground through the grounding carbon brush on the main shaft to avoid short-circuit accidents. Therefore, a special insulation structure is required between the guide bearing sliding rotor and the top shaft on the generator. The electrical and mechanical properties of the insulating material can effectively block the shaft current from passing between the sliding rotor and the guide bearing bush. At the same time, a device for detecting insulation resistance is provided between the insulation layers to monitor the insulation performance in real time. Summary of the invention

[0003] In view of this, the purpose of the present invention is to disclose an insulation and measurement structure for the top shaft of an impulse turbine generator. The insulation and measurement between the top shaft of the generator and the sliding rotor are realized, and the current generated by electromagnetic induction is isolated from being transmitted to other parts of the unit through this part, causing a short-circuit accident. The insulation performance of the top shaft and the sliding rotor is monitored in real time through the insulation measurement circuit, and the risk is prejudged in advance to avoid risks. At the same time, the insulation measurement structure is insulated and fixed to avoid the insulation circuit section and short circuit at high speed. The above measures effectively avoid the occurrence of short-circuit accidents of the unit and improve the operation stability and reliability of the unit.

[0004] The technical solution of the present invention is: it consists of a top shaft, a sliding rotor, a shaft insulation structure, an insulation measurement structure, and a fixed structure; an insulation structure is arranged between the top shaft and the sliding rotor to achieve insulation isolation; the insulation measurement structure is arranged between two layers of insulation structures to measure the insulation performance; and the fixed structure is used to insulate and fix the insulation measurement structure when it exits the shaft.

[0005] The shaft insulation structure consists of a fourth insulation plate, insulation paper, insulation rings, and insulation film; 4 layers of insulation film are wrapped around the outer surface of the top shaft, then 1 layer of copper tape is wrapped, and then 6 layers of insulation film are wrapped, and the end is fixed with adhesive tape to achieve insulation isolation between the top shaft and the sliding rotor.

[0006] The insulation measurement structure consists of a measuring ring, a connecting piece, a copper belt, and an adhesive tape; the copper belt is pressed and fixed between two layers of insulating films through a top shaft and a sliding rotor to measure the insulation between the top shaft and the sliding rotor. The copper belt and the connecting piece are welded together, and the connecting piece and the measuring ring are fixed by bolts to realize the connection of the measuring circuit.

[0007] The fixed structure consists of a first insulating block, a second insulating block, an insulating tube, a first insulating plate, a second insulating plate, and a third insulating plate; the measuring ring is connected to the first insulating block, the second insulating block, and the insulating tube on the sliding rotor through bolts to achieve insulation and fixation to the ground; the copper strip led out from the top shaft is connected to the first insulating plate, the second insulating plate, and the third insulating plate on the sliding rotor through bolts to achieve insulation and fixation to the ground.

[0008] Before the copper tape is fixed on the shaft, it is necessary to half-wrap multiple layers of insulating paper and brush curing glue while wrapping.

[0009] The gaps in the fixed structure need to be filled with curing glue.

[0010] The bolts in the fixed structure need to be locked with curing glue.

[0011] The shaft insulation structure and the insulation measurement structure need to be installed by shrinkage after heating.

[0012] The beneficial effects of the present invention are:

[0013] 1. The top shaft insulation and measurement structure of the impulse turbine generator realizes the insulation between the top shaft of the generator and the sliding rotor, and isolates the current generated by electromagnetic induction from being transmitted to other parts of the unit through this part, causing short-circuit accidents.

[0014] 2. The present invention realizes the insulation measurement between the top shaft and the sliding rotor of the generator, and monitors the insulation performance of the top shaft and the sliding rotor in real time through the insulation measurement circuit, so as to make predictions in advance and avoid risks.

[0015] 3. In view of the fact that the copper strip is prone to fatigue fracture and short circuit at high speed, the present invention performs insulation fixing treatment on the insulation measurement structure to avoid the insulation circuit being broken and short-circuited at high speed.

[0016] 4. The present invention has a stable and simple structure, which improves the safety and stability of the unit operation and greatly facilitates on-site installation and maintenance.

[0017] 5. The present invention has strong applicability to hydro-generator sets of different structures and sizes, has a flexible structure, has low requirements on the structure of the generator set rotor, etc., and has wide engineering application and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is an enlarged view of the structure of the present invention.

[0020] Explanation of the marks in the figure: 1-top shaft; 2-sliding rotor; 3-first insulating block; 4-measuring ring; 5-second insulating block; 6-insulating tube; 7-connecting piece; 8-first insulating plate; 9-second insulating plate; 10-copper belt; 11-third insulating plate; 12-fourth insulating plate; 13-insulating paper; 14-insulating ring; 15-adhesive tape; 16-insulating film; 17-shaft insulation structure; 18-insulating measurement structure; 19-fixing structure. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] like Figure 1 and Figure 2 As shown, an insulation and measurement structure of the top shaft of an impulse turbine generator is composed of a top shaft 1, a sliding rotor 2, a shaft insulation structure 17, an insulation measurement structure 18, and a fixing structure 19; an insulation structure 17 is arranged between the top shaft 1 and the sliding rotor 2 to achieve insulation isolation; the insulation measurement structure 18 is arranged between two layers of insulation structures 17 to measure the insulation performance; and the insulation measurement structure 18 is insulated and fixed by a fixing structure 19 when it is out of the shaft.

[0024] like Figure 1 and Figure 2 As shown, the shaft insulation structure 17 is composed of a fourth insulation plate 12, insulation paper 13, insulation ring 14, and insulation film 16; 4 layers of insulation film 16 are wrapped around the outer surface of the top shaft 1, then 1 layer of copper tape 10 is wrapped, and then 6 layers of insulation film 16 are wrapped, and the end is fixed with an adhesive tape 15 to achieve insulation isolation between the top shaft 1 and the sliding rotor 2.

[0025] like Figure 1 and Figure 2 As shown, the insulation measurement structure 18 is composed of a measuring ring 4, a connecting piece 7, a copper belt 10, and an adhesive tape 15; the copper belt 10 is pressed and fixed between two layers of insulating films 16 through the top shaft 1 and the sliding rotor 2 to measure the insulation between the top shaft 1 and the sliding rotor 2, the copper belt 10 and the connecting piece 7 are welded together, and the connecting piece 7 and the measuring ring 4 are fixed by bolts to realize the connection of the measuring circuit.

[0026] like Figure 1 and Figure 2As shown, the fixing structure 19 is composed of a first insulating block 3, a second insulating block 5, an insulating tube 6, a first insulating plate 8, a second insulating plate 9, and a third insulating plate 11; the measuring ring 4 is bolted to the first insulating block 3, the second insulating block 5, and the insulating tube 6 on the sliding rotor 2 to achieve insulation and fixation to the ground; the copper strip 10 led out from the top shaft 1 is bolted to the first insulating plate 8, the second insulating plate 9, and the third insulating plate 11 on the sliding rotor 2 to achieve insulation and fixation to the ground.

[0027] like Figure 1 and Figure 2 As shown, before the shaft-out portion of the copper strip 10 is fixed, it is necessary to half-wrap multiple layers of insulating paper 13, and brush curing glue 20 while wrapping.

[0028] like Figure 1 and Figure 2 As shown, the gap of the fixing structure 19 needs to be filled with curing glue 20 .

[0029] like Figure 1 and Figure 2 As shown, the bolts in the fixing structure 19 need to be locked with a curing adhesive 20 .

[0030] like Figure 1 and Figure 2 As shown, the shaft insulation structure 17 and the insulation measurement structure 18 need to be installed by heat-shrinkage after being heated.

[0031] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. An insulation and measurement structure for the top shaft of an impulse turbine generator, characterized in that: The invention comprises a top shaft (1), a sliding rotor (2), a shaft insulation structure (17), an insulation measurement structure (18), and a fixing structure (19); the insulation structure (17) is arranged between the top shaft (1) and the sliding rotor (2) to achieve insulation isolation; the insulation measurement structure (18) is arranged between two layers of insulation structures (17) to measure insulation performance; and the fixing structure (19) is used to perform insulation fixation when the insulation measurement structure (18) is out of the shaft.

2. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 1 is characterized in that: The shaft insulation structure (17) is composed of a fourth insulation plate (12), insulation paper (13), an insulation ring (14), and an insulation film (16); four layers of insulation film (16) are wrapped around the outer surface of the top shaft (1), then one layer of copper tape (10) is wrapped, and then six layers of insulation film (16) are wrapped, and the ends are fixed with adhesive tape (15) to achieve insulation isolation between the top shaft (1) and the sliding rotor (2).

3. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 1 is characterized by: The insulation measurement structure (18) is composed of a measuring ring (4), a connecting piece (7), a copper belt (10), and an adhesive tape (15); the copper belt (10) is pressed and fixed between two layers of insulating films (16) through a top shaft (1) and a sliding rotor (2), and the insulation between the top shaft (1) and the sliding rotor (2) is measured; the copper belt (10) and the connecting piece (7) are welded together, and the connecting piece (7) and the measuring ring (4) are fixed by bolts to realize the connection of the measuring circuit.

4. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 1 is characterized by: The fixing structure (19) is composed of a first insulating block (3), a second insulating block (5), an insulating tube (6), a first insulating plate (8), a second insulating plate (9), and a third insulating plate (11); the measuring ring (4) is fixed to the sliding rotor (2) by bolts with the first insulating block (3), the second insulating block (5), and the insulating tube (6) to achieve insulation from the ground and fixation; the copper strip (10) led out from the top shaft (1) is fixed to the sliding rotor (2) by bolts with the first insulating plate (8), the second insulating plate (9), and the third insulating plate (11) to achieve insulation from the ground and fixation.

5. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 2 is characterized by: Before the shaft-out portion of the copper strip (10) is fixed, multiple layers of insulating paper (13) are half-wound, and curing glue (20) is brushed on the strip while wrapping.

6. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 2 is characterized by: The gaps in the fixing structure (19) are filled with curing glue (20).

7. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 2 is characterized by: The bolts in the fixing structure (19) are locked with curing glue (20).

8. The top shaft insulation and measurement structure of a Pelton turbine generator according to claim 3 is characterized by: The shaft insulation structure (17) and the insulation measurement structure (18) are heat-shrink mounted after being heated.

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