A generator set stator coil insulation structure

Abstract

The utility model discloses a generator set stator coil insulation structure relates to generator stator coil insulation moisture -proof technical field, including the component of wrapping, insulation component, the component of wrapping includes wrapping sleeve, the overlapping piece, and the inside of wrapping sleeve is equipped with the wrapping cavity, and the opening slit that is equipped with with the wrapping cavity communication is on the outer wall of wrapping sleeve, the insulation component includes the fire -retardant layer, the moisture -proof layer, the heat insulating layer, the insulating layer, through setting up the wrapping sleeve that is equipped with the fire -retardant layer, the moisture -proof layer, the heat insulating layer, the insulating layer in the inside, is equipped with the opening slit on the wrapping sleeve, can open the inside of wrapping sleeve and will straight line insulation end and wrap in, provides the first layer protection for straight line insulation end, avoids the moisture molecule and enters straight line insulation end, still through the overlapping piece that is equipped with the fire -retardant layer, the moisture -proof layer, the heat insulating layer, the insulating layer with the opening slit, the wrapping sleeve cladding, provides the second layer protection for straight line insulation end, avoids the moisture molecule and enters straight line insulation end, simultaneously, the wrapping sleeve, the overlapping piece and straight line insulation end installation convenient, and the operability is high.

Description

Technical Field

[0001] This utility model relates to the field of generator stator coil insulation and moisture-proof technology, specifically to an insulation structure for generator set stator coils. Background Technology

[0002] A generator set, also known as a "hydro-turbine generator set," is a power generation unit composed of a turbine and its associated generator in a hydropower station. It is the main power equipment for producing electricity in a hydropower station. When the water flowing through the turbine, it converts water energy into mechanical energy to drive the machinery to rotate; the generator then converts the mechanical energy into electrical energy for output. Because the linear insulation end of the coil is inside the stator, the environment is enclosed and blocked. In a humid environment over a long period of time, the insulating paper and mica tape on the linear insulation end are easily corroded, resulting in a shortened service life. The traditional method is to wrap a heat insulation layer and a moisture-proof layer around the linear insulation end, and then heat-shrink the heat insulation layer and moisture-proof layer and wrap it around the linear insulation end to adsorb moisture molecules and ensure the dryness of the linear insulation end. However, the linear insulation end is mostly a "U"-shaped structure, and the operating space is narrow, making the winding operation inconvenient, time-consuming, and difficult to guarantee the sealing after winding.

[0003] Utility model patent CN216851500U discloses an insulation structure for a generator set stator coil, comprising an overall stator coil, the overall stator coil including a straight insulating end in the middle and two curved insulating ends at both ends, wherein an external connection is provided on one end of the curved insulating end, and both the straight insulating end and the curved insulating end include a circuit body; the straight insulating end is composed of a first insulating paper, a first heat insulation layer, a moisture-proof layer, and mica tape, the first insulating paper wrapping around the circuit body, the first heat insulation layer wrapping around the first insulating paper, the moisture-proof layer wrapping around the first heat insulation layer, and the mica tape wrapping around the moisture-proof layer; the curved insulating end is composed of a second insulating paper, a second heat insulation layer, an insulating flame-retardant layer, and a wear-resistant coating layer, the second insulating paper wrapping around the circuit body, and the... The second heat insulation layer is wrapped around the second insulating paper, the insulating flame retardant layer is wrapped around the insulating flame retardant layer, and the wear-resistant coating layer is wrapped around the insulating flame retardant layer. When the entire straight insulating end 1 of the stator coil is in a humid environment inside the stator, the moisture-proof layer 7 can adsorb moisture molecules through its moisture-proof and dehumidifying properties, thereby ensuring the dryness inside the straight insulating end 1. This makes the mica tape 8 and the first heat insulation layer 6 less susceptible to moisture erosion. The first heat insulation layer 6 can ensure the airtightness and heat insulation of the first insulating paper 5. Moreover, the first heat insulation layer 6 is made of adhesive material, which is beneficial for wrapping the moisture-proof layer 7 around the first heat insulation layer 6 during production. The arc insulating end 02 of the coil also has a certain degree of wear resistance. In this patent, the moisture-proof layer and the heat insulation layer are located outside the straight insulating end, which is inconvenient to operate during winding, takes a long time, and makes it difficult to ensure the sealing after winding. Utility Model Content

[0004] The main purpose of this utility model is to provide an insulation structure for the stator coil of a generator set, which solves the problems of easy corrosion of the straight insulation end of the stator coil of the existing generator set in a humid environment and the inconvenience of winding a moisture-proof layer and a heat insulation layer.

[0005] To achieve the above objectives, this utility model provides a generator set stator coil insulation structure, comprising:

[0006] A packaging assembly includes a packaging sleeve and an overlap piece disposed on the packaging sleeve; the packaging sleeve has a packaging cavity inside, and an opening slit communicating with the packaging cavity is provided on the outer wall of the packaging sleeve; the length of the overlap piece exceeds the width of the opening slit, and after the overlap piece is wrapped around the packaging sleeve under the action of external force, it connects with the overlap piece itself so that the overlap piece covers the opening slit.

[0007] The insulating component includes a flame-retardant layer and a moisture-proof layer disposed on the inner wall of the encapsulation cavity and on the overlapping parts; a heat-insulating layer is disposed outside the moisture-proof layer; and an insulating layer is disposed outside the heat-insulating layer.

[0008] As a further improvement of this utility model, the wrapping sleeve is made of polyolefin material; the opening seam is located at the top of the wrapping sleeve.

[0009] As a further improvement of this utility model, a locking connector and a locking groove are respectively provided on both sides of the opening slit; the locking connector and the locking groove are engaged to restrict the opening slit from moving in a direction perpendicular to the axis of the wrapping sleeve.

[0010] As a further improvement of this utility model, the overlapping component includes an overlapping piece; the overlapping piece is made of polyolefin material, and the overlapping piece is located on the outer wall of the wrapping sleeve and is integrally formed with the wrapping sleeve.

[0011] As a further improvement of this utility model, there is a gap between the connecting end of the overlapping piece and the opening seam of the wrapping sleeve.

[0012] As a further improvement of this utility model, the end of the overlapping piece away from the wrapping sleeve is provided with a connector, and the back of the end of the overlapping piece that connects to the wrapping sleeve is provided with a connecting groove; a connecting buckle is provided at the connecting groove; after the overlapping piece wraps around the wrapping sleeve once, the connector is inserted into the connecting buckle and engaged with the connecting groove.

[0013] The beneficial effects of this utility model are reflected in:

[0014] By using a sleeve with an internal flame-retardant layer, moisture-proof layer, heat insulation layer, and insulation layer, and an opening slit in the sleeve, the linear insulating end can be wrapped inside, providing the first layer of protection for the linear insulating end and preventing moisture molecules from entering. Then, an overlapping piece with the same flame-retardant, moisture-proof, heat insulation, and insulation layers is used to cover the opening slit and the sleeve, providing the second layer of protection for the linear insulating end and preventing moisture from entering the linear insulating end. At the same time, the sleeve, overlapping piece, and linear insulating end are easy to install and highly operable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the stator coil insulation structure of a generator set according to the present invention;

[0016] Figure 2 This is a cross-sectional structural diagram of AA, representing the stator coil insulation structure of a generator set according to this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Wrapping sleeve; 2. Overlapping piece; 201. Overlapping piece; 3. Wrapping cavity; 4. Opening seam; 5. Flame retardant layer; 6. Moisture-proof layer; 7. Heat insulation layer; 8. Insulation layer; 9. Clip connector; 10. Clip groove; 11. Connector; 12. Connecting groove; 13. Connecting buckle; 14. Straight insulating end. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] In one embodiment, see Figure 1 The present invention relates to an insulation structure for a generator stator coil, comprising a wrapping component and an insulation component.

[0021] The packaging component includes a packaging sleeve 1 and an overlapping member 2 disposed on the packaging sleeve 1. The packaging sleeve 1 has a packaging cavity 3 inside, and an opening slit 4 communicating with the packaging cavity 3 is provided on the outer wall of the packaging sleeve 1. The length of the overlapping member 2 exceeds the width of the opening slit 4. After the overlapping member 2 is wrapped around the packaging sleeve 1 under the action of external force, it is connected to the overlapping member 2 itself so that the overlapping member 2 covers the opening slit 4. The insulation component includes a flame-retardant layer 5 and a moisture-proof layer 6 disposed on the inner wall of the packaging cavity 3 and on the overlapping member 2. A heat insulation layer 7 is disposed outside the moisture-proof layer 6, and an insulation layer 8 is disposed outside the heat insulation layer 7.

[0022] Preferably, the flame retardant layer 5 is made of aramid paper, the moisture-proof layer 6 is made of glass cloth, the heat insulation layer 7 is made of polyimide film, and the insulation layer 8 is made of mica tape.

[0023] Further, see Figure 1 The wrapping sleeve 1 is made of polyolefin material, and the opening slit 4 is located at the top of the wrapping sleeve 1.

[0024] Preferably, the wrapping sleeve 1 is a U-shaped hollow cylindrical structure, and the opening slit 4 is formed by cutting the wrapping sleeve 1 with a knife.

[0025] Further, see Figure 1 The two sides of the opening slit 4 are respectively provided with a locking connector 9 and a locking groove 10. The locking connector 9 and the locking groove 10 are engaged to restrict the opening slit 4 from moving in a direction perpendicular to the axis of the wrapping sleeve 1.

[0026] Preferably, the snap-fit ​​connector 9 has a "T" shaped structure, and the snap-fit ​​groove 10 corresponds to the "T" shape of the snap-fit ​​connector 9. After the package 1 is connected to the flame-retardant layer 5, the moisture-proof layer 6, the heat insulation layer 7, and the insulation layer 8, "T" shaped snap-fit ​​grooves 10 are chiseled out on both edges of the opening slit 4 of the package 1. After the snap-fit ​​grooves 10 are chiseled out, the shape of the snap-fit ​​connector 9 appears. The snap-fit ​​connectors 9 and snap-fit ​​grooves 10 on both sides of the opening slit 4 are staggered to facilitate the snap-fit ​​of the snap-fit ​​connectors 9 and snap-fit ​​grooves 10 on both sides of the opening slit 4.

[0027] In the above configuration, the commonly used generator set stator coil linear insulation ends 14 are mostly U-shaped structures arranged in a continuous interval, with small spacing between adjacent linear insulation ends 14. In this application, the shape of the wrapping sleeve 1 is set according to the shape of the linear insulation end 14. For the U-shaped linear insulation end 14, the wrapping sleeve 1 is set as a U-shaped structure, with the opening slit 4 located at the top of the wrapping sleeve 1. When the wrapping sleeve 1 is put on the linear insulation end 14, the wrapping sleeve 1 is opened from the opening slit 4 so that the linear insulation end 14 is inserted into the wrapping cavity 3. The insulation layer 8 is in direct contact with the linear insulation end 14 and is snapped into the snapping joint 9 through the snapping groove 10, thereby tightly snapping the wrapping sleeve 1 onto the linear insulation end 14. The wrapping sleeve 1 is heated (hot air can be used) so that the wrapping sleeve 1 initially shrinks and tightly wraps around the linear insulation end 14.

[0028] In one embodiment, see Figure 1 , 2 The overlapping component 2 includes an overlapping piece 201, which is made of polyolefin material. The overlapping piece 201 is located on the outer wall of the wrapping sleeve 1 and is integrally formed with the wrapping sleeve 1.

[0029] Preferably, the overlapping piece 201 unfolds into a sheet-like structure.

[0030] Further, see Figure 2 There is a gap between the connecting end of the overlapping piece 201 and the wrapping sleeve 1 and the opening seam 4.

[0031] Preferably, the distance between the connecting end of the overlapping piece 201 and the wrapping sleeve 1 and the opening seam 4 is between 10mm and 20mm.

[0032] Further, see Figure 2 The end of the overlapping piece 201 away from the wrapping sleeve 1 is provided with a connector 11. The back of the end of the overlapping piece 201 that is connected to the wrapping sleeve 1 is provided with a connecting groove 12. A connecting buckle 13 is provided at the connecting groove 12. After the overlapping piece 201 wraps around the wrapping sleeve 1 once, the connector 11 is inserted into the connecting buckle 13 and snapped into the connecting groove 12.

[0033] Preferably, the connector 11 has a "Z" shaped structure, and one end of the connector 11 is fixedly connected to the overlapping piece 201.

[0034] Preferably, the connecting groove 12 is a long strip structure, the connecting buckle 13 is a "U" shaped structure, and the internal width of the connecting buckle 13 is the same as the width between the two ends of the connector 11.

[0035] In the above setup, after the wrapping sleeve 1 is connected and wrapped around the linear insulating end 14 via the snap-fit ​​connector 9 and snap-fit ​​groove 10, the wrapping sleeve 1 is heated to initially shrink and firmly connect with the linear insulating end 14. Then, the overlapping piece 201 is wrapped around the wrapping sleeve 1 once, so that the overlapping piece 201 covers the opening 4. The connector 11 at the end of the overlapping piece 201 is inserted into the connecting buckle 13 and pushed into the connecting groove 12. The connector 11 is simultaneously snapped into the connecting buckle 13. The overlapping piece 201, connector 11, and connecting buckle 13 are heated to shrink and tightly wrap around the wrapping sleeve 1, thereby completing the protection of the linear insulating end 14. By wrapping the linear insulating end 14 with the overlapping piece 201 and the wrapping sleeve 1 and initially sealing it after heat shrinking, moisture is reduced from entering. The moisture-proof layer 6 absorbs moisture molecules, ensuring the dryness inside the linear insulating end 14 and preventing corrosion of the linear insulating end 14.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An insulation structure for the stator coil of a generator set, characterized in that, include: The packaging assembly includes a packaging sleeve (1) and an overlap member (2) disposed on the packaging sleeve (1); the packaging sleeve (1) has a packaging cavity (3) inside, and an opening slit (4) communicating with the packaging cavity (3) is provided on the outer wall of the packaging sleeve (1); the length of the overlap member (2) exceeds the width of the opening slit (4), and the overlap member (2) is connected to the overlap member (2) itself after being wrapped around the packaging sleeve (1) under the action of external force, so that the overlap member (2) covers the opening slit (4); The insulating component includes a flame-retardant layer (5) and a moisture-proof layer (6) disposed on the inner wall of the encapsulation cavity (3) and on the overlapping member (2); the moisture-proof layer (6) is provided with a heat insulation layer (7); the heat insulation layer (7) is provided with an insulation layer (8).

2. The stator coil insulation structure of a generator set according to claim 1, characterized in that: The wrapping sleeve (1) is made of polyolefin material; the opening slit (4) is located on the top of the wrapping sleeve (1).

3. The stator coil insulation structure of a generator set according to claim 2, characterized in that: The two sides of the opening (4) are respectively provided with a snap connector (9) and a snap groove (10); the snap connector (9) and the snap groove (10) are snapped together to restrict the opening (4) from moving in a direction perpendicular to the axis of the wrapping sleeve (1).

4. The stator coil insulation structure of a generator set according to claim 3, characterized in that: The overlapping component (2) includes an overlapping piece (201); the overlapping piece (201) is made of polyolefin material, and the overlapping piece (201) is located on the outer wall of the wrapping sleeve (1) and is integrally formed with the wrapping sleeve (1).

5. The stator coil insulation structure of a generator set according to claim 4, characterized in that: There is a gap between the connecting end of the overlapping piece (201) and the wrapping sleeve (1) and the opening seam (4).

6. The generator set stator coil insulation structure according to claim 5, characterized in that: The end of the overlapping piece (201) away from the wrapping sleeve (1) is provided with a connector (11), and the back of the end of the overlapping piece (201) connected to the wrapping sleeve (1) is provided with a connecting groove (12); a connecting buckle (13) is provided at the connecting groove (12); after the overlapping piece (201) wraps around the wrapping sleeve (1) once, the connector (11) is inserted into the connecting buckle (13) and engaged with the connecting groove (12).

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