Method and device for disassembling and assembling stator coil of steam turbine generator and phase modifier

Abstract

The invention discloses a steam turbine generator and phase modifier stator coil disassembling and assembling method and device, and belongs to the technical field of steam turbine generator and phase modifier repairing. According to the invention, the problem that no fixed supporting tool is provided for improving the safety and the installation stability when the stator coil is disassembled and installed during the replacement of the stator coil of the steam turbine generator and the phase modifier at present is solved. The method comprises the following steps: dismounting a stator coil and mounting the stator coil, clamping a tooth part of a stator core through an insulating block on a supporting tool, aligning a U-shaped groove of the supporting tool with the stator coil to be taken down, pulling out the stator coil by using a pull belt, supporting the stator coil through the U-shaped groove, and axially moving the supporting tool until the stator coil is completely taken out. According to the steam turbine generator and phase modifier stator coil dismounting and mounting method and device, the stator coil at the top does not fall suddenly to hurt people when being dismounted, and safety guarantee is provided for field operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steam turbine generator and phase modifier repair, and particularly relates to a steam turbine generator and phase modifier stator coil dismounting and mounting method and device. BACKGROUND

[0002] Steam turbine generator and phase modifier on-site replacement of single or several stator coils is a common repair work. When the stator coil is dismounted from the stator lower wire slot, it will be subjected to certain resistance. Thus, a support point is needed to enable the dismounting stator coil to generate a pulling force on the stator coil.

[0003] If the dismounted stator coil is at the circumferential top position, it is easy to fall down and hurt people due to untimely protection at the moment of dismounting the stator coil from the stator lower wire slot. Therefore, necessary measures are taken to catch the stator coil at the top of the stator bore during dismounting.

[0004] When the new stator coil, especially the new stator coil at the top position, is mounted, the operator holds the new stator coil upward and puts it into the stator lower wire slot. However, this operation needs a certain time, and the new stator coil is heavy. In this case, the operation is difficult and it is difficult to ensure that the bottom surface of the new stator coil can be closely fitted. Auxiliary support tools are needed to assist the operation, so as to ensure that the new stator coil is put into the stator lower wire slot and closely fitted.

[0005] Therefore, the present application proposes a steam turbine generator and phase modifier stator coil dismounting and mounting method and device to solve the above problems. SUMMARY

[0006] The research and development purpose of the present application is to solve the problem that there is no fixed support tool to improve safety and stability during dismounting and mounting the stator coil of the steam turbine generator and phase modifier. In the following, a brief summary of the present application is given to provide a basic understanding of some aspects of the present application. It should be understood that this summary is not an exhaustive summary of the present application. It is not intended to determine the key or important parts of the present application, nor to limit the scope of the present application.

[0007] The technical scheme of the present application is as follows:

[0008] Scheme one: a steam turbine generator and phase modifier stator coil dismounting and mounting method, comprising the following steps:

[0009] Dismounting the stator coil:

[0010] S1: removing the slot wedge for fixing the stator coil;

[0011] S2: Put the support tool into the stator bore, fix the insulating blocks on the ends of the support tool on the stator core teeth and clamp them, align the U-shaped grooves between the two insulating blocks with the stator coils to be removed, fix the ends of the other end of the support tool on the stator core teeth opposite to the 180° of the stator coils to be removed;

[0012] S3: Wrap one end of the pull belt around the stator coil and fix it, wrap the other end of the pull belt around the end of the support tool and fix it;

[0013] S4: repeatedly tighten the pull belt, make the stator coil rise from the stator lower slot into the stator bore and enter the U-shaped groove of the support tool, when the bottom surface of the stator coil is separated from the stator core teeth, use the insulating wedge-shaped strip to pad the gap between the stator coil and the stator core teeth, and loosen the pull belt;

[0014] S5: In the stator bore, move the support tool along the axial direction of the stator bore, align the U-shaped groove of the support tool with the next section of the stator coil to be pulled out, assemble the pull belt again, repeatedly tighten the pull belt to make the stator coil at this position rise from the stator lower slot and separate from the stator core teeth, and move the insulating wedge-shaped strip to continue padding the gap between the stator coil and the stator core teeth;

[0015] S6: Repeat step S5 until the stator coil is completely separated from the stator lower slot and is caught by the U-shaped groove of the end of the support tool;

[0016] Install the stator coil:

[0017] D1: Lift the new stator coil into the stator bore and put it into the stator lower slot;

[0018] D2: Put two support tools into the stator bore and fix them, support the stator coil through the U-shaped grooves of the two support tools;

[0019] D3: Insert the thin end of the insulating wedge-shaped strip into the gap between the bottom of the stator coil and the U-shaped groove, continue to hammer the insulating wedge-shaped strip, drive the stator coil into the stator lower slot through the insulating wedge-shaped strip, until the stator coil contacts the bottom of the stator lower slot.

[0020] Solution two: a device for disassembling and assembling the stator coil of a steam turbine generator and a phase modifier, which is used to realize the method for disassembling and assembling the stator coil of a steam turbine generator and a phase modifier as described in solution one, the support tool comprises a hollow rod and a support part, the support part is arranged at both ends of the hollow rod respectively, the support part is connected with the hollow rod through threads, the support part is connected with an insulating block, and a U-shaped groove is processed on the support part.

[0021] Further, one end of the hollow rod is processed with left-handed thread, the other end of the hollow rod is processed with right-handed thread, one supporting part is threadedly connected with one end of the hollow rod through the left-handed thread, and the other supporting part is threadedly connected with the other end of the hollow rod through the right-handed thread.

[0022] Further, the hollow rod is processed with a through hole.

[0023] The present application has the following beneficial effects:

[0024] 1. The method for disassembling and assembling the stator coil of the steam turbine generator and the phase modifier realizes that the stator coil at the top will not fall suddenly and hurt people when being disassembled, provides safety guarantee for on-site operation, adopts the disassembly mode of pulling the belt to pull, and avoids the damage problem caused by the reaction force of the wedge on the other stator coils reserved in the lower wire slot of the stator when the stator coil is outwardly expanded through the wedge.

[0025] 2. When installing a new stator coil, the method for disassembling and assembling the stator coil of the steam turbine generator and the phase modifier overcomes the problem that the new stator coil at the top is heavy and difficult to lift manually, ensures that the new stator coil is reassembled in place in the lower wire slot of the stator, and can better ensure that there is no gap between the stator coil and the bottom of the slot.

[0026] 3. The device for disassembling and assembling the stator coil of the steam turbine generator and the phase modifier, the hollow rod of the supporting tool is connected with one supporting part at two ends through reverse threads, under this design, the two supporting parts on the two sides can be simultaneously extended or retracted by rotating the end of the hollow rod, the operation is convenient and fast, the through hole is processed on the hollow rod, when the supporting tool is supported in the stator bore, a screwdriver or a steel rod is inserted into the through hole to continue to rotate the hollow rod, so that the supporting tool is more stable in the stator bore. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a front view of the supporting tool installed in the stator bore;

[0028] Figure 2 is a perspective view of the supporting tool installed in the stator bore;

[0029] Figure 3 is a sectional view of the supporting tool installed in the stator bore;

[0030] Figure 4 is a front view of the supporting tool;

[0031] Figure 5 is a side view of the supporting tool;

[0032] Figure 6 is a schematic view of the disassembled stator coil;

[0033] Figure 7is a schematic view of installing stator coil.

[0034] In the figure: 1 - stator lower slot, 2 - stator core tooth part, 3 - support tool, 4 - U-shaped slot, 5 - insulation block, 6 - stator coil, 7 - slot wedge, 8 - stator bore, 9 - pull belt, 10 - insulation wedge-shaped strip, 11 - hollow rod, 12 - support part, 13 - through hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0036] The connection mentioned in the present application is divided into fixed connection and detachable connection. The fixed connection (i.e. non-detachable connection) includes but is not limited to conventional fixed connection modes such as flange connection, rivet connection, adhesive connection and welding connection, and the detachable connection includes but is not limited to conventional detachable modes such as threaded connection, buckle connection, pin connection and hinge connection. When the specific connection mode is not specifically limited, at least one connection mode can be found in the existing connection mode to realize the function, and the person skilled in the art can select it according to the needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.

[0037] Embodiment 1, in combination Figures 1-7 This embodiment is a method for disassembling and assembling the stator coil of a steam turbine generator and a phase modifier, which comprises the following steps:

[0038] Disassemble the stator coil 6:

[0039] S1: remove the slot wedge 7 used to fix the stator coil 6;

[0040] S2: put the support tool 3 into the stator bore 8, the length of the support tool 3 is less than the diameter of the stator bore 8 when put in, after put in, the one end support part 12 of the support tool 3 is supported on the stator core tooth part 2 and clamped, the hollow rod 11 of the support tool 3 is rotated, the support parts 12 at both ends of the hollow rod 11 are simultaneously elongated, until the other end of the hollow rod 11 also supports the stator core tooth part 2 at 180° opposite, the U-shaped slot 4 between the insulation blocks 5 is determined to be aligned with the stator coil 6 to be removed, then a screwdriver or an iron rod is inserted into the through hole 13 of the hollow rod 11, the hollow rod 11 is further rotated by means of the screwdriver or the iron rod, until the support tool 3 is stably clamped in the stator bore 8;

[0041] S3: one end of the pull belt 9 is wound around the stator coil 6 and fixed, and the other end of the pull belt 9 is wound around the end of the support tool 3 away from the wound stator coil 6 and fixed;

[0042] S4: repeatedly tighten the pull belt 9, so that the stator coil 6 is lifted from the stator lower slot 1 into the stator bore 8 and enters the U-shaped groove 4 of the support tool 3, when the bottom surface of the stator coil 6 is separated from the stator core tooth part 2, use the insulating wedge-shaped strip 10 to pad the gap between the stator coil 6 and the stator core tooth part 2, and loosen the pull belt 9;

[0043] S5: in the stator bore 8, move the support tool 3 along the axial direction of the stator bore 8, so that the U-shaped groove 4 of the support tool 3 is aligned with the next section of the stator coil 6 to be pulled out, and the pull belt 9 is assembled again. Repeatedly tighten the pull belt 9 to lift the stator coil 6 from the stator lower slot 1 and separate it from the stator core tooth part 2, and move the insulating wedge-shaped strip 10 to continue padding the gap between the stator coil 6 and the stator core tooth part 2;

[0044] S6: repeat step S5 until the stator coil 6 is completely separated from the stator lower slot 1, and the stator coil 6 is caught by the U-shaped groove 4 at the end of the support tool 3;

[0045] Install the stator coil 6:

[0046] D1: lift the new stator coil 6 into the stator bore 8 and put it into the stator lower slot 1;

[0047] D2: use two support tools 3 to put into the stator bore 8 and fix, and support the stator coil 6 through the U-shaped groove 4 of the two support tools 3;

[0048] D3: insert the narrow end of the insulating wedge-shaped strip 10 into the gap between the bottom of the stator coil 6 and the U-shaped groove 4, and continue to hammer the insulating wedge-shaped strip 10 to drive the stator coil 6 into the stator lower slot 1 until the stator coil 6 contacts the bottom of the stator lower slot 1, and the installation of the stator coil 6 is completed and the slot wedge 7 is inserted.

[0049] Embodiment 2, combined Figures 4-7 This embodiment is described, a stator coil dismounting and mounting device for a turbo-generator and a phase modifier, the support tool 3 includes a hollow rod 11 and a support part 12, one end of the hollow rod 11 is machined with left-handed internal threads, the rod end of the support part 12 is machined with external threads compatible with it, the support part 12 is connected with the internal threads of the hollow rod 11 through the external threads, the other end of the hollow rod 11 is machined with right-handed internal threads, the rod end of the other support part 12 is machined with external threads compatible with it, which is connected at the other end of the hollow rod 11 through the external threads. The two ends of the hollow rod 11 are connected with the support part 12 through threads of different directions, when the hollow rod 11 is rotated, the two ends of the support part 12 will be stretched out or contracted at the same time.

[0050] A U-shaped groove 4 is machined on the support portion 12, and two insulating blocks 5 are mounted on the support portion 12, with the U-shaped groove 4 being arranged between the two insulating blocks 5;

[0051] Before installation, first shorten the length of the supporting tool 3 to be smaller than the diameter of the stator bore 8, insert the supporting tool 3 deep into the stator bore 8, and first clamp the insulating block 5 on the supporting part 12 at one end of the hollow rod 11 on the stator core tooth 2 on one side, then rotate the hollow rod 11 to extend the supporting parts 12 on both sides of the hollow rod 11 at the same time, until the insulating block 5 on the supporting part 12 on the other side of the hollow rod 11 is against the stator core tooth 2, continue to screw the hollow rod 11 to strengthen the stability of the supporting tool 3, use the front end of the screwdriver or the iron rod to insert it into the through hole 13 of the hollow rod 11, and use the screwdriver or the iron rod to continue to turn the hollow rod 11 to ensure the stability of the supporting tool 3.

[0052] This embodiment is only an illustrative description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for disassembling and assembling the stator coil of a steam turbine generator and a phase regulator, characterized in that: The following steps are involved: Remove the stator coil (6): S1: Remove the slot wedge (7) used to fix the stator coil (6); S2: Place the support tool (3) into the stator chamber (8), fix the insulating block (5) at the end of the support tool (3) on the stator core tooth (2) and clamp it, so that the U-shaped groove (4) between the two insulating blocks (5) is aligned with the stator coil (6) to be removed, and fix the other end of the support tool (3) at the stator core tooth (2) 180° opposite to the stator coil (6) to be removed; S3: Wrapping one end of the pull belt (9) around the stator coil (6) and fixing it, and wrapping the other end of the pull belt (9) around the end of the supporting tool (3) and fixing it; S4: repeatedly tighten the tensioning band (9) to make the stator coil (6) tilt from the stator lower wire slot (1) to the stator bore (8) and enter the U-shaped slot (4) of the support tool (3). When the bottom surface of the stator coil (6) is separated from the stator core tooth portion (2), an insulating wedge-shaped strip (10) is used to pad the gap between the stator coil (6) and the stator core tooth portion (2), and loosen the tensioning band (9); S5: Inside the stator bore (8), move the support tool (3) along the axial direction of the stator bore (8) so that the U-shaped groove (4) of the support tool (3) is aligned with the next section of the stator coil (6) to be pulled out, and re-assemble the drawstring (9). Repeatedly tighten the drawstring (9) so that the stator coil (6) here is tilted from the stator lower wire slot (1) and leaves the stator core tooth portion (2). Move the insulating wedge-shaped strip (10) to continue to pad the gap between the stator coil (6) and the stator core tooth portion (2); S6: Repeat step S5 until the stator coil (6) is completely separated from the stator lower wire slot (1), and the stator coil (6) is received by the U-shaped slot (4) at the end of the supporting tool (3); Install the stator coil (6): D1: Lift the new stator coil (6) into the stator chamber (8) and place it into the stator lower wire slot (1); D2: Use two supporting tools (3) to place them into the stator chamber (8) and fix them, and support the stator coil (6) through the U-shaped grooves (4) of the two supporting tools (3); D3: Insert the thin end of the insulating wedge-shaped strip (10) into the gap between the bottom of the stator coil (6) and the U-shaped slot (4), and continue hammering the insulating wedge-shaped strip (10) to drive the stator coil (6) into the stator lower wire slot (1) through the insulating wedge-shaped strip (10) until the stator coil (6) contacts the bottom of the stator lower wire slot (1).

2. A device for disassembling and assembling a stator coil of a steam turbine generator and a phase condenser, the device being used to implement the method for disassembling and assembling a stator coil of a steam turbine generator and a phase condenser according to claim 1, characterized in that: The supporting tool (3) comprises a hollow rod (11) and a supporting portion (12). The supporting portions (12) are respectively provided at both ends of the hollow rod (11). The supporting portion (12) is connected to the hollow rod (11) via a thread. An insulating block (5) is connected to the supporting portion (12). A U-shaped groove (4) is processed on the supporting portion (12).

3. The device for disassembling and assembling the stator coil of a steam turbine generator and a phase regulator according to claim 2, characterized in that: One end of the hollow rod (11) is processed with a left-handed thread, and the other end of the hollow rod (11) is processed with a right-handed thread. One support portion (12) is threadedly connected to one end of the hollow rod (11) via the left-handed thread, and the other support portion (12) is threadedly connected to the other end of the hollow rod (11) via the right-handed thread.

4. The device for disassembling and assembling the stator coil of a steam turbine generator and a phase regulator according to claim 3, characterized in that: A through hole (13) is machined on the hollow rod (11).

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