Generator stator coil pulling-out tool

Abstract

The utility model relates to a tool for pulling out a stator coil of a generator, which belongs to the technical field of generator maintenance and comprises an oil cylinder base capable of being arranged on a stator iron core, a transition plate arranged on the oil cylinder base, an oil cylinder arranged on the transition plate and pull rods arranged on the oil cylinder. The pull rod I penetrates through the oil cylinder, the transition plate and the oil cylinder base and can be connected with the upper-layer coil, and the pull rod II penetrates through the oil cylinder, the transition plate and the oil cylinder base and can be connected with the lower-layer coil. According to the utility model, the whole faulty stator coil can be pulled out of the stator core at one time by using a tool according to actual requirements on the premise that the stator core is not damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of generator maintenance, in particular to a generator stator coil extraction tool. Background Art

[0002] The coils of large generators are divided into upper and lower stator coils, which are sequentially inserted into the stator core slots using an oil cylinder. The slot wedge gaps between the stator coils and the stator core are filled with insulating material. After the coils are inserted, the entire generator is cured using GVPI whole-unit impregnation technology. Once the generator stator is dried, the coils, core, and insulation material are bonded together to form a single unit. This generator has a compact structure and good integrity after impregnation. However, when stator coils develop problems and require replacement and repair during subsequent whole-unit testing or power plant operation, disassembly and repair are difficult, making it very challenging.

[0003] Currently, in the field of generator maintenance technology using the GVPI process, the technical research on the complete extraction of stator coils is still at a blank stage. The research of this utility model fills this research gap. The following technical discussion uses the stator coil extraction of a 500MW water-hydrogen-cooled generator as an example. Utility Model Content

[0004] The utility model aims to provide a tool for extracting a faulty stator coil from a stator core after the generator is fully immersed, which can meet the needs of stator coil maintenance during maintenance.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model provides a generator stator coil extraction tool, including a cylinder base that can be arranged on the stator core, a transition plate arranged on the cylinder base, a cylinder arranged on the transition plate, and a pull rod arranged on the cylinder, the pull rod can be divided into pull rod I and pull rod II, the pull rod I passes through the cylinder, the transition plate and the cylinder base and can be connected to the upper coil, the pull rod II passes through the cylinder, the transition plate, and the cylinder base and can be connected to the lower coil.

[0006] Preferably, the top of the pull rod is located outside the oil cylinder and is provided with a nut and a washer three.

[0007] Preferably, a second washer is provided between the nut and the third washer.

[0008] Preferably, the oil cylinder base includes a bracket, and a positioning block is provided at the bottom of the bracket.

[0009] Preferably, the bottom of the positioning block protrudes and can cooperate with the dovetail slot of the stator core.

[0010] Preferably, the bracket is connected to the positioning block via screws.

[0011] Preferably, the top of the bracket is connected to the transition plate by bolts.

[0012] Preferably, the bolt is connected to the transition plate via a washer.

[0013] Preferably, the number of the oil cylinder bases is two and they are located on both sides of the pull rod respectively, and the tops of the two oil cylinder bases are connected by the transition plate.

[0014] In summary, the present invention has the following beneficial technical effects:

[0015] The utility model can be used to pull out the entire stator coil with problems from the stator core at one time by using a tool without damaging the stator core according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the assembly of a generator stator coil extraction tool when extracting the upper layer of wire rods;

[0017] Figure 2 This is a schematic diagram of the assembly of a generator stator coil extraction tool when extracting a layer of wire rods;

[0018] Figure 3 This is a structural schematic diagram of the oil cylinder base in a generator stator coil extraction tool of the utility model;

[0019] Figure 4 This is a structural schematic diagram of a transition plate in a generator stator coil extraction tool according to the present invention;

[0020] Figure 5 This is a structural schematic diagram of a pull rod I in a generator stator coil extraction tool according to the present invention;

[0021] Figure 6 This is a structural schematic diagram of a pull rod II in a generator stator coil extraction tool according to the present invention;

[0022] Figure 7 The utility model is a schematic structural diagram of a washer three in a generator stator coil extraction tool.

[0023] Figure numerals: 001, cylinder base; 002, screw; 003, washer 1; 004, transition plate; 005, pull rod I; 006, nut; 007, washer 2; 008, washer 3; 009, pull rod II; 010, positioning block; 011, bracket; 012, upper coil; 013, lower coil; 014, stator core; 015, dovetail groove; 016, cylinder. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The present invention discloses a generator stator coil extraction tool comprising a cylinder base 001, a transition plate 004, a pull rod I 005, a pull rod II 009, and a washer III 008. After the stator coil is punched, the cylinder base 001 is positioned in conjunction with the stator slot wedge. The cylinder base 001 is bolted to the transition plate 004, and the transition plate 004 is bolted to the cylinder 016. One end of the pull rod passes through the inner bores of the cylinder 016 and the transition plate 004 and is screwed into a threaded hole drilled in the top surface of the stator coil. The other end of the pull rod is tightened to the top surface of the cylinder 016 using a washer III 008 and a nut 006, thereby integrally connecting the stator coil, cylinder base 001, transition plate 004, and cylinder 016. During the extraction process, oil pressure is applied to the cylinder 016, and the stator coil is extracted from the stator core 014 by the extension of the piston of the cylinder 016.

[0026] The cylinder base 001 is connected by the positioning block 010 and the bracket 011 through bolts or screws 002, and realizes the positioning function by cooperating with the stator core; the central through hole of the transition plate 004 is used to pass the pull rod, and the remaining threaded holes are fixed to the cylinder 016 and the cylinder base 001 through screws 002; the threaded ends of the pull rod I 005 and the pull rod II 009 are respectively connected to the screw holes on the top surfaces of the upper coil 012 and the lower coil 013, and the hexagonal head end passes through the transition plate 004, the washer three 008 and the cylinder 016, which is convenient for an external electric wrench to apply torque; the pull rod passes through the washer, and the washer three 008 is tightened to the upper end face of the cylinder 016 through the nut 006.

[0027] Specifically, in this embodiment, the cylinder base 001 is fixedly connected to other components by the bracket 011 and the positioning block 010 through the hexagonal cylindrical head screw, wherein the positioning block 010 and the stator core 014 utilize the protruding part of the positioning block 010 and the dovetail groove 015 of the core punching to achieve the positioning function.

[0028] The transition plate 004 serves as a connecting plate between the left and right cylinder bases 001, and also as a connecting plate between the cylinder base 001 and the hydraulic cylinder 016. It is fixed to the bracket 011 using hexagon socket head screws and fixed to the cylinder 016 using bolts, playing a transition role.

[0029] One end of the tie rod is formed into a hexagonal head, and the remaining portion is threaded. Tie rod I (005) is long enough to screw one end into the threaded hole of the upper wire rod, and the other end passes through the top of cylinder (016). It is tightened against the top of cylinder (016) using washer (008) and nut (006). Tie rod II (009) is long enough to connect the lower wire rod to cylinder (016). The hexagonal head on one end of the tie rod is used for tightening and removing the tie rod during installation.

[0030] like Figure 1 In the generator stator coil repair tool shown, the double-dotted line portion at the lower end represents the stator core 014, the solid line portion represents the generator stator coil repair tool of the present invention, and the double-dotted line portion at the upper end represents the oil cylinder 016.

[0031] like Figure 2 The oil cylinder base 001 shown is connected by a positioning block 010 and a bracket 011 by bolts. The bottom protrusion of the positioning block 010 cooperates with the dovetail groove 015 of the stator core 014. The bottom protrusion block has the same width as the dovetail groove 015 of the stator core 014. The two parts jointly realize the positioning function; the bracket 011 raises the distance between the oil cylinder 016 and the stator core 014, and leaves space between the two brackets 011 for the coil to be pulled out.

[0032] like Figure 3 The transition plate 004 shown is bolted downwardly to the Figure 4 The oil cylinder base 001 is connected and connected to the oil cylinder 016 upwards through bolts.

[0033] like Figure 4 The tie rod Ⅰ 005 shown passes through the oil cylinder 016 and the oil cylinder base 001, and the threaded end is screwed down into the upper coil 012, and the hexagonal head is higher than the upper end surface of the oil cylinder 016. When screwing in, use an electric wrench and hexagonal head to tighten the tie rod.

[0034] like Figure 5 The tie rod II 009 shown passes through the oil cylinder 016 and the oil cylinder base 001, and the threaded end is screwed down into the lower coil 013, and the hexagonal head is higher than the upper end surface of the oil cylinder 016. When screwing in, use the hexagonal wrench and the hexagonal head to tighten the tie rod.

[0035] like Figure 6 The washer 3 008 shown is placed on the upper end surface of the oil cylinder 016 and contacts the tightening nut 006, thereby increasing the contact area between the nut 006 and the upper end surface of the oil cylinder 016.

[0036] The utility model relates to the development of a tool for extracting a faulty stator coil from a stator core 014 of a generator using GVPI technology. In response to practical needs, the tool can be used to extract the entire faulty stator coil from the stator core 014 at once without damaging the stator core 014.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A generator stator coil extraction tool, characterized in that: The invention comprises an oil cylinder base (001) which can be arranged on a stator core (014), a transition plate (004) arranged on the oil cylinder base (001), an oil cylinder (016) arranged on the transition plate (004), and a pull rod arranged on the oil cylinder (016). The pull rod can be divided into a pull rod I (005) and a pull rod II (009). The pull rod I (005) passes through the oil cylinder (016), the transition plate (004) and the oil cylinder base (001) and can be connected to an upper coil (012). The pull rod II (009) passes through the oil cylinder (016), the transition plate (004) and the oil cylinder base (001) and can be connected to a lower coil (013).

2. A generator stator coil extraction tool according to claim 1, characterized in that: The top of the pull rod is located outside the oil cylinder (016) and is provided with a nut (006) and a washer three (008).

3. A generator stator coil extraction tool according to claim 2, characterized in that: A second washer (007) is provided between the nut (006) and the third washer (008).

4. A generator stator coil extraction tool according to claim 1, characterized in that: The oil cylinder base (001) comprises a bracket (011), and a positioning block (010) is provided at the bottom of the bracket (011).

5. A generator stator coil extraction tool according to claim 4, characterized in that: The bottom of the positioning block (010) is protruding and can be matched with the dovetail groove (015) of the stator core (014).

6. A generator stator coil extraction tool according to claim 4, characterized in that: The bracket (011) is connected to the positioning block (010) via screws (002).

7. A generator stator coil extraction tool according to claim 6, characterized in that: The top of the bracket (011) is connected to the transition plate (004) via bolts.

8. A generator stator coil extraction tool according to claim 7, characterized in that: The bolt and the transition plate (004) are connected with a washer 1 (003).

9. The generator stator coil extraction tool according to claim 1, characterized in that: The oil cylinder bases (001) are provided in two and are respectively located on both sides of the pull rod, and the tops of the two oil cylinder bases (001) are connected via the transition plate (004).

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