JPH0974724A - Stator-winding disassembling device for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to perform the disassembling work of a stator winding safely using a light labor of a small number of persons by providing a wedge-shaped disassembling device, which pushes up the stator winding, a load suspending device and a carrier device. SOLUTION: The wedge-shaped tip part of a wedge-shaped disassembling device 14 is inserted into the end part side of the cut surfaces of an upper-side stator winding 4b and a lower-side stator winding 4a on the side of a turbine and on the side of a collector. The inserted wedge-shaped disassembling device 14 moves itself with a driving device 19, gradually advances toward the central part of an iron core from both end parts of the iron core and slowly draws the upper-side stator winding 4b from a slot. The drawn upper-side stator winding 4b is temporarily set in the hollow part in the stator core for the time being. Thereafter, the worker operates a load suspending device 20, moves the upper-side stator winding 4b on a carrier device 21 at the lower part of the stator core and carries out the winding 4b to the outside of the stator frame. Thus, the disassembling work of the stator winding can be performed safely using a light labor of a small number of persons.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator winding disassembling apparatus which can efficiently disassemble a stator winding when renewing a stator winding of a rotary electric machine.

[0002]

2. Description of the Related Art A rotating electric machine is gradually deteriorated during long-term use. Above all, a stator winding of the rotating electric machine is used under severe mechanical stress and thermal stress. Its insulation performance is likely to deteriorate.

In a large rotating electric machine used in a power plant or the like, if the insulation performance of the stator winding deteriorates, batch updating of the entire stator is an option, but the crane capacity is insufficient. In some cases, it is not possible to update the entire stator at once due to problems such as loading and unloading to and from the building, or the overall construction period. In such a case, if the other stator constituent members are sound, it is preferable from the viewpoint of resource economy to update only the stator winding. From such a background, in recent years, the opportunity to update only the stator winding is increasing.

FIG. 3 shows a structure of a stator of a general rotating electric machine, and FIG. 4 shows an external shape of a stator winding. Also, FIG.
Shows an assembly drawing of the stator windings in the slots. In these figures, the stator core 2 arranged in the stator frame 1 is
A large number of slots 3 are processed so as to open to the inner surface thereof, and the stator windings 4 are inserted into these slots 3. Further, a stator winding wedge 5 is inserted in the wedge groove formed at the entrance of the slot 3 in order to fix the stator winding 4 in the slot. In addition, in this example, the stator winding 4 in the slot 3 includes a lower stator winding 4a,
It is composed of the upper stator winding 4b, and the slot 3 is filled with side ripple springs 6 and padding 7 in order to suppress the vibration of the stator winding 4 during operation.

In the stator of the rotating electric machine having such a structure, when the stator winding is to be renewed, first, the stator winding 4 inserted into the slot 3 of the stator core 2 is disassembled. Then need to be removed. However, the stator winding, which is the main current path in the rotating electric machine, is made of a copper material, and its ends are firmly connected by solder or solder. Further, the stator windings and the connecting portions of the end portions are covered with a tough insulating material. Therefore,
After disassembling the stator winding wedge 5, the end of the stator winding 4 is cut by some method, and then the stator winding 4 is pulled out from the slot 3.

However, the lower stator winding 3a and the upper stator winding 4b inserted in the slot 3 are composed of the side ripple spring 6, the padding 7 and the stator winding wedge 5.
Since it is firmly inserted in the slot 3 by the above, even if the stator winding wedge 5 is disassembled, it cannot be easily pulled out from the slot. Therefore, in order to pull out the lower stator winding 4a and the upper stator winding 4b from the slot 3,
It requires a lot of manpower and time. Hereinafter, the outline of this work will be described with reference to FIGS.

As described above, after disassembling the stator winding wedge 5, the end connecting portions of the lower stator winding 4a and the upper stator winding 4b are cut by, for example, a saw-tooth cutter. Next, the pull cord 8a is attached to the upper stator winding 4b outside the core ends of the cut upper and lower stator windings, and one end of the other pull cord 8b is inserted into the slot 3 of the opposing stator core 2. It is fixed to the inserted provisional wedge 9. These pull cords 8
By interposing a chain block 10 between a and 8b and operating this chain block, the upper stator winding 4b is slightly pulled out from the slot 3.

Subsequently, several workers enter the stator core, attach a drawstring 8c to the hook-shaped wire 11, and this hook-shaped wire is used for cooling the stator core 2 at about 40-
The upper stator winding 4b to be pulled out by utilizing the air duct gaps at several points (about 1.5 m apart) of the air duct 12 arranged every 60 mm over the entire length and circumference of the stator core. Wrap around. Next, as in the case of FIG. 7, the tension string 8b is fixed to the temporary wedge 9 inserted into the slot 3 of the stator core 2 facing the fishing hook wire 11.
A chain block 10 is interposed between the pull cord 8b and the pull cord 8c, and by operating this chain block, the upper stator winding 4b is gradually moved from the both ends of the stator core to the slot 3 to the central portion of the core. Pull out towards you. When pulling out the stator windings, the stator windings 4 to be pulled out in order to make it easier to pull out from the slots 3.
Vibration is given by hitting b with a wooden hammer 13.

The pulled-out upper stator winding 4b is received by a few workers in the stator core in a middle waist posture, and once lowered to the lower part, is supported by everyone in a middle waist posture outside the stator core. Carry out.

After pulling out one stator winding in this way, the next stator winding is pulled out,
By repeating this in sequence, all the upper stator windings 4b are pulled out from the slots 3. After that, the same work as above is repeated to pull out all the lower stator windings 4a.

As described above, the work of pulling out the stator winding from the inside of the slot requires a lot of manpower and time, and is a painstaking work. Further, since the work is performed in a narrow stator core, there are many problems in that the work is performed in a middle-waist posture that is physically very tight, and there is a problem that it is dangerous.

[0012]

As described above,
Since the work of disassembling the stator windings of a rotating electric machine is performed in a narrow stator core, the work posture tends to be an unnatural posture such as mid-waist, which is physically demanding and requires a lot of manual labor. And needed time.

The present invention has been made in order to solve the above problems, and enables the disassembling work of the stator winding to be carried out as soon as possible, safely, lightly, and by a small number of people. It aims to realize rationalization and efficiency.

[0014]

SUMMARY OF THE INVENTION A stator winding disassembling apparatus for a rotating electric machine according to the present invention is a wedge-shaped disassembling apparatus which is inserted into a slot of a stator iron core and pushes up the stator winding. A lifting device that lifts the stator winding that has been pushed up and pulled out from the slot and transfers it to the transfer device, and a transfer device that transfers the stator winding transferred from this lifting device to the outside of the stator core. The main feature is to have and.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a wedge-shaped disassembling device which is inserted into a slot of a stator iron core and pushes up a stator winding has a base portion having a wedge-shaped tip and a tip portion attached to the base portion. A push-up plate that opens and closes at the other end with this tip as a fulcrum, and a pressure mechanism that opens and closes this push-up plate. This pressurizing mechanism not only has the function of pressurizing the push-up plate by air pressure from a pneumatic cylinder etc. to open and close it,
It also has a function to vibrate the push-up plate. In addition, the wedge-shaped disassembling device is provided with a drive device that is driven by a motor and makes the entire device self-propelled.

The hoisting device is installed on both ends of the stator frame or on the floor surface outside thereof, and by utilizing its multi-joint mechanism, the stator winding pulled out from the slot of the stator core is hoisted and conveyed. Transfer to equipment. Note that the hoisting device detects the weight of the hoisted stator winding, automatically balances with this weight, and can be temporarily stopped in the hollow, and can be moved by pulling by a person. It is desirable to have a function. Further, the transfer device is composed of a roller conveyor and a belt conveyor, and is arranged on the lower part inside the stator core and the floor surface outside its extension, and the stator winding transferred from the hoisting device is attached to the stator core. Transport it outside.

According to the present invention having such a configuration, the work of disassembling the stator winding can be mechanized, so that work in an unnatural posture such as a middle waist and the like accompanying work in a narrow space,
The work that is very physically demanding and persistent is improved, and it is particularly effective for the stator winding update work of the rotating electric machine that is performed in the power plant.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In these drawings, a large number of slots 3 are formed in the stator core 2 arranged in the stator frame 1 so as to open to the inner surface thereof, and the stators are formed in these slots 3. Winding 4 is inserted. In this example,
The stator winding 4 is inserted in the same slot 3 as the lower stator winding 4a and the upper stator winding 4b,
In the wedge groove formed at the entrance of the slot 3, the stator winding 4
A stator winding wedge (not shown) is inserted to secure the coil in the slot.

When disassembling the stator windings in the rotary electric machine having such a structure, after disassembling the stator winding wedges, the end portions of the lower stator winding 4a and the upper stator winding 4b are disassembled. Is cut by some method, for example, a saw-tooth cutter. Next, the wedge-shaped tip portion of the wedge-shaped decomposition device 14 is inserted between the ends of the cut surfaces of the upper stator winding 4b and the lower stator winding 4a on the turbine side and the collector side. When the gap between the upper and lower stator windings is slightly widened by this insertion, the wedge-shaped disassembling device 14 is inserted further deeply between the upper and lower stator windings 4a and 4b.

The wedge-shaped disassembling device 14 has a width slightly smaller than that of the slots of the stator core, and the overall shape is similar to a wedge. The board portion 15 has a wedge-shaped tip portion, and the push-up plate 16 is provided on the upper surface slightly rearward of the wedge-shaped tip portion.
Has one end rotatably attached. A pressurizing mechanism 17 such as a pneumatic cylinder is installed on the upper surface of the central portion of the substrate portion 15. The pressurizing plate 16 is pressurized by the pressurizing mechanism 17 in the vicinity of the middle thereof, and the other end side opens and closes vertically. The pressurizing mechanism 17 has not only a function of pressurizing the push-up plate 16 by air pressure or the like to open and close it, but also a function of exciting the push-up plate 16 at a desired frequency. Further, a drive device 19 driven by a motor 18 is installed on the substrate portion 15 so that the entire wedge-shaped disassembling device 14 can be self-propelled.

As shown in FIG. 2, a suspension device 20 having multiple joints is attached to both ends of the stator frame 1, and the tip ends thereof extend into the stator core 2. This hoisting device 20 detects the weight of the stator winding 4 that is a hoisting load, automatically balances with this weight, and can be temporarily stopped in the hollow, and can be pulled by a person to move it vertically, horizontally, and longitudinally. It has a function of easily moving in the direction. The hoisting device 20 can be directly attached to the stator frame 1 or can be installed on the floor surface outside the stator frame 1.

At the lower part of the inner surface of the stator core 2, a transfer device 21 composed of a roller conveyor or a belt conveyor is installed. Also, on the floor surface outside the extension of the stator frame 1, a similar conveying device is installed on the extension line of the roller conveyor or the belt conveyor, and both are connected.

The operation of the apparatus of the present invention constructed as above will be described below.

Since the wedge-shaped disassembling device 14 inserted between the upper and lower stator windings 4a and 4b has a wedge-shaped overall shape, the gap between the upper and lower stator windings 4a and 4b increases as the insertion depth increases. To go. In this case, the push-up plate 16 reduces the frictional resistance between the inner wall of the slot and the surface of the stator winding by vibrating by the air pressure, and the opening / closing function of the pressurization mechanism 17 causes the push-up plate 16 to move the stator winding from the inside of the slot 3. While repeating the pushing-up operation, the driving device 19 self-propels and gradually advances from both ends of the iron core toward the center of the iron core, and gradually pulls out the upper stator winding 4b from the slot.

The upper stator winding 4b gradually pulled out from the inside of the slot 3 in this way is temporarily emptied from the hollow inside the stator core by the hoisting devices 20 attached to both ends of the stator frame 1. Is temporarily placed in. Thereafter, the operator operates the hoisting device 20 to move the upper stator winding 4b onto the carrier device 21 below the stator core, and the carrier device carries the upper stator winding out of the stator frame.

After the upper stator winding 4b has been pulled out from the slot and carried out to the outside of the stator frame 1 as described above, the wedge-shaped disassembling device 14 is moved to the slot and the lower stator winding 4a. Insert between, and perform the same operation as above,
The lower stator winding 4a is gradually pushed up from the inside of the slot 3 and pulled out, and is carried out of the stator frame by the hoisting device 20 and the carrying device 21.

[0028]

As described above, according to the present invention, when the renewal work due to the deterioration of the insulation performance of the stator winding is performed at a power plant or the like, the stator winding is disassembled, especially from the inside of the slot. Since the work of pulling out the wire is mechanized, it can be performed very easily, quickly and efficiently. Also, after the stator winding is pulled out from the slot, the load of the stator winding, which is a heavy load, is supported by the hoisting device, so it is necessary to support the stator winding in a narrow waist within a narrow core. Without
Further, the carrying out of the stator winding from the inside of the stator core can be easily carried out by the carrying device.

Therefore, the labor of disassembling the stator winding in the work of renewing the stator winding, which requires a lot of time and manpower, can be saved, and its effect is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view of a wedge-shaped disassembling apparatus according to an embodiment of the present invention in a use state.

FIG. 2 is a perspective view of a usage state showing an embodiment of a hoisting device and a carrying device according to the present invention.

FIG. 3 is a vertical cross-sectional view showing an outline of a stator of a rotary electric machine to which the device of the present invention is applied.

4 is an external view illustrating a stator winding in the stator of FIG.

5 is a cross-sectional view illustrating a stator winding in a slot of the stator of FIG.

FIG. 6 is an explanatory diagram showing a situation of pulling out an upper stator winding in a conventional stator winding disassembling method.

FIG. 7 is an explanatory diagram showing a method of attaching a chain block in a conventional stator winding disassembling method.

FIG. 8 is an explanatory diagram showing a method of attaching a hook-shaped wire in a conventional stator winding disassembling method.

[Explanation of symbols]

 1 ... Stator frame 2 ... Stator core 3 ... Slot 4 ... Stator winding 4a ... Lower stator winding 4b ... Upper stator winding 5 ... Stator winding wedge 6 ... Side Ripple spring 7 …… stuffing 8a, 8b, 8c …… pulling string 9 …… temporary wedge 10 …… chain block 11 …… fishing wire 12 …… air duct 14 …… wedge disassembling device 15 …… substrate part 16 …… Push-up plate 17 ... Pressure mechanism 18 ... Motor 19 ... Driving device 20 ... Loading device 21 ... Transporting device

Claims (7)

[Claims] 1. A stator winding disassembling device for a rotating electric machine, wherein a stator iron core is housed in a cylindrical stator frame, and the stator winding housed in a slot of the stator iron core is disassembled. , A wedge-shaped disassembling device that is inserted into the slot of the stator core and pushes up the stator winding, and the stator winding that is pushed up by this wedge-shaped disassembling device and pulled out from the slot is lifted and transferred to the transfer device. An apparatus for disassembling a stator winding of a rotating electric machine, comprising: a hoisting device; and a carrying device that carries the stator winding transferred from the hoisting device to the outside of the stator core. 2. A stator winding disassembling apparatus for a rotating electric machine, wherein a stator iron core is housed in a cylindrical stator frame and the stator winding housed in a slot of the stator iron core is disassembled. A wedge-shaped disassembling device, which is inserted into a slot of the stator core and pushes up the stator winding, has a substrate portion having a wedge-shaped tip, and a tip portion is attached to the substrate portion. A stator winding disassembling device for a rotating electric machine comprising: a push-up plate whose side is opened and closed; and a pressurizing mechanism for opening and closing the push-up plate. 3. The pressurizing mechanism has a function of pressurizing the push-up plate by air pressure from the pneumatic cylinder to open and close the push-up plate, and a function of vibrating the push-up plate. Rotating electric machine stator winding disassembly device. 4. The stator winding of a rotating electric machine according to claim 1, wherein the wedge-shaped disassembling device is provided with a drive device that is driven by a motor and makes the entire device self-propelled. Line decomposition equipment. 5. A hoisting device having multi-joints on both ends of the stator frame or on a floor surface outside the hoisting frame and hoisting a stator winding drawn from a slot of a stator core and transferring the hoisting coil to a transfer device. The stator winding disassembling device for a rotating electric machine according to claim 1, wherein the device is installed. 6. The hoisting device detects the weight of the hoisted stator winding, automatically balances with the weight and can be temporarily stopped in a hollow state, and a person pulls the stator winding. The stator winding disassembling device for a rotary electric machine according to claim 5, having a function of moving the coil. 7. The stator winding disassembling apparatus for a rotary electric machine according to claim 1, wherein a carrier device is disposed on a lower portion inside the stator core and a floor surface outside the extension thereof.