Head combining structure for stator bar of hydro-generator

Abstract

The utility model discloses a hydro-generator stator bar end combining structure which comprises an upper layer end combining block, a lower layer end combining block, an upper layer bar lead and a lower layer bar lead, the inner end of the upper layer end combining block is provided with a male S-shaped welding surface, and the inner end of the lower layer end combining block is provided with a female S-shaped welding surface. The male S-shaped welding face and the female S-shaped welding face are attached and fixed through welding. The outer end of the upper-layer end-combining block is provided with an upper-layer winding bar mounting part, the folded yarn of the upper-layer winding bar lead is welded in the upper-layer winding bar mounting part, the outer end of the lower-layer end-combining block is provided with a lower-layer winding bar mounting part, and the folded yarn of the lower-layer winding bar lead is welded in the lower-layer winding bar mounting part. According to the utility model, a plane welded junction of an electric connector type structure is changed into an S-shaped welded junction, so that part of welding area is enlarged, and meanwhile, the upper and lower end combining blocks effectively reduce internal stress caused by rising of a coil bar, deviation in a pitch direction and uniform butt joint in the butt joint process.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydro-generator manufacturing, in particular to a hydro-generator stator wire bar parallel end structure. Background Art

[0002] The larger the capacity of a hydro-turbine generator set, the higher the requirements for component layout and process quality. The stator bar paralleling sleeve design significantly impacts stator size, and this impact becomes a key factor influencing component layout and process quality improvement. The stator coils of large hydro-turbine generators all utilize a bar-type stator bar structure. After the bar wire is embedded and installed, the upper and lower ends of the bar need to be connected, a process known as paralleling. This is accomplished by brazing. The paralleling sleeve design is influenced by a variety of factors, including electrical performance, process performance, spatial location, and thermal effects.

[0003] The splint-type structure requires a lot of welding work, with four welded surfaces, making the welding process quite challenging. The welded surfaces are close to the insulation layer of the wire rod. Using high-power medium-frequency induction heating equipment, even with air or water cooling, can easily damage the insulation layer on the wire rod.

[0004] The welding workload of the electric joint structure is small, there is only one butt welding surface, and the welding is completed when the welding heat is conducted to the insulation; however, there is a problem of strength change at the joint due to internal stress. Utility Model Content

[0005] In response to the problems existing in the background technology, the utility model provides a stator wire rod parallel head structure of a hydro-turbine generator, and the technical solution includes: an upper parallel head block, a lower parallel head block, an upper wire rod lead and a lower wire rod lead, wherein the inner end of the upper parallel head block is provided with a male S-shaped welding surface, and the inner end of the lower parallel head block is provided with a female S-shaped welding surface, the male S-shaped welding surface and the female S-shaped welding surface are fitted and fixed by welding; the outer end of the upper parallel head block is provided with an upper wire rod mounting portion, and the strands of the upper wire rod lead are welded in the upper wire rod mounting portion; the outer end of the lower parallel head block is provided with a lower wire rod mounting portion, and the strands of the lower wire rod lead are arranged in the lower wire rod mounting portion by welding.

[0006] The upper and lower parallel header blocks are installed in the insulation box by pouring a glue layer.

[0007] An upper lead insulation layer is provided outside the area where the upper wire rod lead is not covered by the upper header block.

[0008] The lower wire rod lead is not provided with a lower lead insulation layer outside the lower header block area.

[0009] The upper wire rod mounting portion has two welded sides.

[0010] The lower wire rod mounting portion has two welded sides.

[0011] The beneficial effects of the present invention are as follows: the present invention changes the flat weld of the electric joint structure into an S-shaped weld, thereby increasing part of the welding area; at the same time, the upper and lower header blocks effectively reduce the internal stress caused by the deviation in the wire rod elevation and pitch direction during the butt connection process, thereby increasing the strength and stability of the weld of the upper and lower wire rods; at the same time, the insulation distance between the welding surface and the wire rod is kept relatively far, which will not damage the insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a longitudinal sectional view of an embodiment of a parallel structure of stator wire bars of a hydro-generator according to the present utility model;

[0013] Figure 2 is a schematic diagram of another longitudinal section of an embodiment of the present utility model;

[0014] Figure 3 It is a schematic diagram of a transverse section in an embodiment of the present utility model.

[0015] Among them: 1-upper layer parallel header block, 2-lower layer parallel header block, 3-upper layer wire rod lead, 4-lower layer wire rod lead, 5-upper layer lead insulation layer, 6-lower layer lead insulation layer, 7-potting glue layer, 8-insulation box, 101-male S-shaped welding surface, 102-upper layer wire rod mounting part, 201-female S-shaped welding surface, 202-lower layer wire rod mounting part. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2 The embodiment of the utility model shown includes: an upper header block 1, a lower header block 2, an upper wire rod lead 3, a lower wire rod lead 4, an upper lead insulation layer 5, a lower lead insulation layer 6, a potting glue layer 7 and an insulating box 8, wherein the inner end of the upper header block 1 is provided with a male S-shaped welding surface 101, and the inner end of the lower header block 2 is provided with a female S-shaped welding surface 201, the male S-shaped welding surface 101 and the female S-shaped welding surface 201 are fitted and fixed by welding; the outer end of the upper header block 1 is provided with an upper wire rod mounting portion 102, and the strands of the upper wire rod lead 3 are welded in the upper wire rod mounting portion 102, the outer end of the lower header block 2 is provided with a lower wire rod mounting portion 202, and the strands of the lower wire rod lead 4 are arranged in the lower wire rod mounting portion 202 by welding; the upper header block 1 and the lower header block 2 are installed in the insulating box 8 through the potting glue layer 7.

[0018] The upper wire rod lead 3 is not provided with an upper lead insulation layer 5 outside the area covered by the upper header block 1; the lower wire rod lead 4 is not provided with a lower lead insulation layer 6 outside the area of ​​the lower header block 2.

[0019] In this embodiment, in order to ensure the fixing effect of the upper wire bar lead 3 and the lower wire bar lead 4, the upper wire bar mounting portion 102 and the lower wire bar mounting portion 202 both have two welding side surfaces.

[0020] During installation, first weld the strands of the upper wire rod lead 3 and the lower wire rod lead 4 to the upper parallel block 1 and the lower parallel block 2 respectively, then fit the male S-shaped welding surface 101 and the female S-shaped welding surface 201 together and place the welding piece (S-shaped) at the joint, heat and weld to form, achieve conduction, put on the insulating box, and fill the insulating box with insulating potting glue to form a potting glue layer 7 to improve the insulation performance of the insulating box.

Claims

1. A hydro-generator stator bar parallel end structure, characterized in that: include: An upper header block (1), a lower header block (2), an upper wire rod lead (3) and a lower wire rod lead (4), wherein the inner end of the upper header block (1) is provided with a male S-shaped welding surface (101), the inner end of the lower header block (2) is provided with a female S-shaped welding surface (201), the male S-shaped welding surface (101) and the female S-shaped welding surface (201) are fitted together and fixed by welding; an upper wire rod mounting portion (102) is provided at the outer end of the upper header block (1), the strands of the upper wire rod lead (3) are welded in the upper wire rod mounting portion (102), the outer end of the lower header block (2) is provided with a lower wire rod mounting portion (202), the strands of the lower wire rod lead (4) are welded in the lower wire rod mounting portion (202).

2. The stator bar parallel structure of a hydro-generator according to claim 1, characterized in that: The upper layer parallel header block (1) and the lower layer parallel header block (2) are installed in an insulating box (8) through a perfusion glue layer (7).

3. The stator bar parallel structure of a hydro-generator according to claim 1, characterized in that: An upper lead insulation layer (5) is provided outside the area of ​​the upper wire rod lead (3) not covered by the upper header block (1).

4. The stator bar parallel structure of a hydro-generator according to claim 1, characterized in that: A lower layer lead insulation layer (6) is provided outside the area of ​​the lower layer wire rod lead (4) not covered by the lower layer header block (2).

5. The stator bar parallel structure of a hydro-generator according to claim 1, characterized in that: The upper wire rod mounting portion (102) has two welding sides.

6. The stator bar parallel structure of a hydro-generator according to claim 1, characterized in that: The lower wire bar mounting portion (202) has two welding sides.

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