JP2019009167A - Oil-filled transformer and manufacturing method of tank using the same - Google Patents

Abstract

To provide an oil-filled transformer that considers the yield improvement and energy conservation of an oil-filled transformer.SOLUTION: In an iron-filled transformer which houses an iron core-coil assembly in which an iron core and a coil are assembled in a tank and includes insulation oil, the tank includes a flange for mounting a lid and a body part composed of a bottom plate and a side plate, and the flange is fixed by welding on the outside of the body part, and the bottom plate is fixed by welding inside the body part, and the bottom plate uses a member hollowed out from the plate used for the flange.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an oil-filled transformer, and more particularly to a tank of an oil-filled transformer in consideration of yield improvement and energy saving.

  In general, an oil-filled electrical device, for example, a tank of an oil-filled transformer, contains insulating oil as an insulating medium of the transformer. The insulating oil expands when the temperature rises due to the energization heat of the transformer, and the internal pressure of the tank rises. Therefore, the tank needs to have sufficient strength so as not to be deformed. Moreover, the heat dissipation performance which can suppress the temperature rise of insulating oil with low heat conduction is requested | required.

  As a prior art of this type of tank, there is JP-A-53-35122 (Patent Document 1). In Patent Document 1, the tank has upper and lower side plates and corrugated side plates, and the side plates are formed with a number of fin-like overhangs formed by sequentially bending at right angles. It is described that the space in the outlet is formed in an overhanging oil chamber in which oil in the tank can convect.

JP-A-53-35122

  In the prior art shown in Patent Document 1, it is described that the tank has upper and lower side plates and corrugated side plates, but no consideration is given to yield improvement and energy saving of the upper and lower side plates.

  An object of this invention is to provide the oil-filled transformer which considered the yield improvement and energy saving of the oil-filled transformer.

  In view of the above-mentioned background art, the present invention is an oil-filled transformer in which an iron core-coil assembly in which an iron core and a coil are assembled is housed in a tank and insulating oil is put therein. The tank is composed of a body part consisting of a flange for attaching a lid, a bottom plate, and a side plate, the flange is fixed by welding outside the body part, the bottom plate is fixed by welding inside the body part, and the bottom plate is flanged It is comprised so that the member cut out from the board used for may be used.

  ADVANTAGE OF THE INVENTION According to this invention, the oil-filled transformer which considered the yield improvement and energy saving of the oil-filled transformer can be provided.

1 is a schematic perspective view of an entire tank in Embodiment 1. FIG. 2 is a longitudinal sectional view of the entire tank in Embodiment 1. FIG. It is the schematic diagram which showed the relationship between the flange in Example 1, and a baseplate. It is a schematic perspective view of the whole tank which provided the wave rib in Example 1. FIG. It is a schematic perspective view of the whole tank which provided the embossing in Example 1. FIG. It is a schematic perspective view of the whole tank in Example 2. FIG. It is a cross-sectional view of the oil-filled transformer in Example 2. It is explanatory drawing which shows the welding part of the flange and trunk | drum in Example 2. FIG. It is a schematic perspective view of the whole tank which provided the wave rib in Example 2. FIG. It is a schematic perspective view of the whole tank which provided the embossing in Example 2. FIG. 6 is a schematic perspective view of the entire tank in Embodiment 3. FIG. 6 is a longitudinal sectional view of the entire tank in Embodiment 3. FIG. It is explanatory drawing which shows the welding part of the baseplate and trunk | drum in Example 3. FIG. It is explanatory drawing which shows the welding part of the flange and trunk | drum in Example 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic perspective view of the entire tank in the present embodiment. In FIG. 1, a tank 10 is composed of a flange 11 for attaching a lid, a bottom plate 12, and a body portion 13 made of a side plate, thereby insulating an iron core-coil assembly in which an iron core and a coil are assembled. It is comprised so that the insulating oil for may be accommodated. The body part 13 is formed by pressing a sheet-like book board, for example, a steel plate. Reference numeral 14 denotes a leg portion that supports the entire tank.

  Moreover, FIG. 2 is a longitudinal cross-sectional view of the oil-filled transformer seen from the AA line of FIG. As shown in FIG. 2, the flange 11 is fixed to the body part 13 by welding outside the body part 13, and the bottom plate 12 is fixed to the body part 13 by welding inside the body part 13.

  FIG. 3 is a schematic diagram showing the relationship between the flange 11 and the bottom plate 12 in the present embodiment. As shown in FIG. 3, by cutting out the bottom plate 12 from the plate on which the outer shape of the flange 11 is formed, the cut surfaces of the inner shape of the flange 11 and the outer shape of the bottom plate 12 coincide with each other to obtain similar members. be able to. As shown in FIG. 2, the flange 11 is fixed outside the body portion 13 and the bottom plate 12 is fixed inside the body portion 13, so that for example, laser cutting can be performed from the plate forming the outer shape of the flange 11. In the case of hollowing out, the welding gap between the flange 11 and the bottom plate 12 can be eliminated by setting the laser width to the thickness of the side plate constituting the body portion 13.

  In addition, you may cut | disconnect several times with a laser width smaller than the plate | board thickness of a side plate. Moreover, it cut | disconnects by the width | variety more than the plate | board thickness of a side plate, and the difference with plate | board thickness may be filled up with the bead by welding. Alternatively, the bottom plate 12 may be cut out from the plate used for the flange 11 first, and then the outer shape of the flange 11 may be formed.

  Thus, since the shape of a bottom plate and a flange becomes similar by using the member which hollowed out the inside for a flange as a bottom plate, there exists an effect that it becomes difficult to produce a difference in the tank internal pressure in the upper and lower parts of a tank. In particular, when the tank structure has a curved surface portion or a recessed portion, if the shape of the bottom plate and the flange do not match, the strength and yield will decrease, but this can be achieved by using a member hollowed out in the flange for the bottom plate. Can solve the problem.

  Moreover, since the member which hollowed out the inside of a flange is used for a baseplate, there exists an effect of the yield improvement of a member. In addition, waste materials can be reduced, and energy saving effects are also expected. In addition, since the flange and bottom plate can be acquired automatically, no errors due to design errors or errors are generated. Moreover, it is possible to eliminate the welding gap between the flange and the bottom plate by adjusting the laser width for cutting.

  FIG. 4 is a schematic perspective view of the entire tank provided with wave ribs in the present embodiment. FIG. 1 shows that the body portion 13 is composed of a side plate that is a flat plate, whereas FIG. 4 shows a configuration in which the side plate that forms the body portion has corrugated bent wave ribs 40 for increasing the heat radiation area. is there. In this configuration, similarly to the above, by using the member hollowed out in the flange 11 for the bottom plate, there is an effect of improving the yield and energy saving, and at the same time improving the heat dissipation effect.

  FIG. 5 is a schematic perspective view of the entire tank provided with embossing in the present embodiment. In FIG. 1, the body portion 13 is constituted by a side plate that is a flat plate, whereas in FIG. 5, a convex portion or a concave portion emboss 50 is formed on the side plate that forms the body portion. In this configuration, similarly to the above, by using a member hollowed out in the flange 11 for the bottom plate, it is possible to improve the yield and save energy, and at the same time, the heat dissipation can be further improved. There is an effect that the strength of the can be improved.

  As described above, in this embodiment, the tank is configured by the body portion including the flange for attaching the lid, the bottom plate, and the side plate, the flange is fixed by welding outside the body portion, and the bottom plate is the body portion. The inside is fixed by welding, and the bottom plate is configured to use a member cut out from the plate used for the flange.

  As a result, it is possible to improve the yield of the members and to reduce the waste material, to have an energy saving effect, and to prevent a decrease in the strength of the tank.

  FIG. 6 is a schematic perspective view of the entire tank in the present embodiment. FIG. 7 is a top view of the cross section of the oil-filled transformer in which the iron core-coil assembly is housed in the tank. FIG. 7 shows an oil-filled transformer having a three-phase three-leg structure. In addition, the structure of the same function as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description.

  As shown in FIG. 7, in the oil-filled transformer in the present embodiment, the iron core-coil assembly 20 in which the iron core 21 and the coil 22 are assembled has a plurality of phases (U phase 26) on a plurality of legs of the iron core 21. , V-phase 27 and W-phase 28) coils 22 are provided. The coil 22 includes a primary coil portion 23 and a secondary coil portion 24. The throttle portion 15 is formed on the surface of the body portion 13 of the tank facing the interphase contact portion 25 where the coils 22 of the plurality of phases are close to each other so that the insulating oil 30 provided on the outer periphery of the coil 22 has a constant layer thickness. Is provided. The throttle portion 15 extends in the axial direction of the coil 22 and is recessed toward a portion where a plurality of phase coils are close to each other.

  In this embodiment, the surface of the body portion 13 of the tank 10 is formed as a curved surface extending along the outer peripheral surface of the coil 22 so that the insulating oil 30 on the outer peripheral surface of the coil 22 has a substantially constant layer thickness. Accordingly, the insulation distance 16a of the interphase contact portion with the periphery of the tank can be reduced to the necessary insulation distance 16b on the insulation performance while ensuring the necessary insulation distance 16b on the insulation performance. The heat conduction of the insulating oil is small, for example, 0.12 W / m · K, but the heat conduction of the metal tank is relatively large, for example, 80 W / m · K. Therefore, the heat radiation performance can be improved by reducing the thickness of the insulating oil having a low thermal conductivity and reducing the distance to the tank having a relatively large thermal conductivity. According to this structure, the heat dissipation from the coil which is a heat source can be improved by thinning the insulating oil layer. In addition, the oil-filled transformer can be reduced in size.

  Also in this embodiment, as shown in FIG. 2, the flange 11 is fixed by welding outside the body portion 13, and the bottom plate 12 is fixed by welding inside the body portion 13. Then, as shown in FIG. 3, each member having a similar relationship between the inner shape of the flange 11 and the outer shape of the bottom plate 12 can be obtained by hollowing out the bottom plate 12 from the plate on which the outer shape of the flange 11 is formed.

  Here, fixing by the welding of the flange 11 and the trunk | drum 13 is considered. FIG. 8 is an explanatory view showing a welded portion between the flange 11 and the body portion 13 in the present embodiment. In FIG. 8, (a) is the figure which looked at the flange 11 from the baseplate side, and has shown the welding part with the fuselage | body part 13. FIG. Moreover, (b) is the longitudinal cross-sectional view of an oil-filled transformer similar to FIG. As described above, the body portion 13 in the present embodiment is formed by a curved surface extending along the outer peripheral surface of the coil 22 and faces the portion 25 where the coils 22 of the plurality of phases are close to each other. A diaphragm portion 15 is provided on the surface of the body portion 13. Therefore, if the welding torch used for welding does not enter the throttle portion 15 and the wire jumping length is short, welding may not be possible.

  Therefore, in this case, as shown in FIG. 8A, the portion excluding the throttle portion 15 is welded from the bottom plate side of the flange 11 outside the body portion 13. The hatched portion shows a bead formed by welding.

  That is, a region of the flange 11 where the welding torch enters the drawn portion 15 has a welded portion on the B side of the flange 11, and a region where the welding torch does not enter the drawn portion 15 has a welded portion on the C side of the flange 11. Therefore, it is possible to form a welded portion having a distance that the sum of the weld lengths of the welded portion on the B side and the welded portion on the C side of the flange 15 is longer than the outer peripheral surface of the tank. Therefore, the welding strength can be improved as compared with the case where only the flange 15B side is welded.

  In other words, when the tank is observed in a top view, if there is a portion where the C-side welding slab, which is the upper surface of the flange 15, and the B-side welding slab, which is the lower surface, overlap, The strength of welding is improved.

  Furthermore, when the plate thickness of the flange 15 is thin, the portion welded from the B side in the region where the welding torch does not enter the throttle portion 15 and the weld portion in the region where the welding torch enters the throttle portion 15 are welded. Furthermore, the welding strength is improved.

  Even if the total weld length on the B side of the flange 15 and the total welded portion on the C side are the same as when only the flange B side is welded, the welded portion is the C side that is the upper surface of the flange 15 and B that is the lower surface. Since it exists on the side, the flange 15 can be firmly connected to the body portion 13.

  Further, as shown in FIG. 8 (b), the narrowed portion 15 is welded from the direction indicated by C on the flange 11, which is the opposite side to the bottom plate side of the flange 11. In addition, the direction shown to B has shown the welding direction about the part except the aperture | diaphragm | squeeze part 15, and it welds from the baseplate side of the flange 11 of the outer side of the trunk | drum 13 of a tank.

  In this way, by welding from both surfaces of the flange 11, welding of the throttle portion 15 of the body portion 13 can be realized. Further, welding is possible regardless of the size of the welding torch and the length of wire jump. Further, the angle and range of the throttle portion of the tank can be freely adjusted regardless of the size of the welding torch and the wire protrusion length. Further, by welding most of the portion excluding the throttle portion 15 from the bottom plate side of the flange 11 outside the body portion 13 of the tank, it is possible to reduce the possibility that slag and metal particles resulting from the welding scatter and remain in the tank. Moreover, since most parts except the throttle part 15 are welded from the bottom-plate side of the flange 11, it can reduce as much as possible that the flatness of the upper part of the flange 11 is lost by the bead by welding.

  FIG. 9 is a schematic perspective view of the entire tank provided with wave ribs in the present embodiment. 6, the body portion 13 is configured by a side plate that is a flat plate, whereas FIG. 9 is a configuration in which the side plate that forms the body portion includes wave ribs 40 that are bent to increase the heat radiation area. is there. Also in this configuration, similarly to the above, by using the member hollowed out in the flange 11 for the bottom plate, there is an effect of improving the yield, energy saving, etc., and at the same time, welding of the drawn portion can be realized and the heat dissipation effect is improved. There is an effect.

  FIG. 10 is a schematic perspective view of the entire tank provided with embossing in the present embodiment. In FIG. 6, the body portion 13 is constituted by a side plate that is a flat plate, whereas in FIG. 10, the embossed 50 of a convex portion or a concave portion is formed on the side plate that forms the body portion. In this configuration, similarly to the above, by using a member that is hollowed out in the flange 11 for the bottom plate, there is an effect of improving the yield and energy saving, and at the same time, welding of the drawn portion can be realized, and heat dissipation is further improved. In addition, there is an effect that the strength of the tank can be improved.

  As described above, in this embodiment, the portion other than the throttle portion is welded on the bottom plate side of the outer flange of the body portion, and the throttle portion is welded on the side opposite to the bottom plate side of the outer flange portion of the body portion. Configure.

  Thereby, in addition to the effect of Example 1, welding of an aperture | diaphragm | squeeze part can be implement | achieved, and there exists an effect that a heat dissipation improvement and size reduction of an oil-filled transformer can be achieved.

  FIG. 11 is a schematic perspective view of the entire tank in the present embodiment. FIG. 12 is a longitudinal sectional view of the oil-filled transformer as seen from the line AA in FIG. In addition, the structure of the function same as FIG. 6 attaches | subjects the same code | symbol, and abbreviate | omits the description.

  In the oil-filled transformer in the present embodiment, as shown in FIG. 12, the side plate constituting the body portion 13 has a raised portion on the flange 11 side and is bent, and the side plates of the flange 11 and the body portion 13 are bent. Welded in a superposed state. The bottom plate 12 also has a raised portion and is bent, and is welded in a state where the bottom plate 12 and the side plate of the trunk portion 13 are overlapped inside the trunk portion 13.

  FIG. 13 is an explanatory view showing a welded portion between the bottom plate and the body portion in the present embodiment. 13A shows a welded portion between the bottom plate 12 and the body portion 13 in the case of the configuration of FIG. 2 of the first embodiment, and FIG. 13B shows a welded portion between the bottom plate 12 and the body portion 13 of the present embodiment. Is shown. As shown to (a), a board thicker than the side board which comprises the trunk | drum 13 is used for the baseplate 12 on a structure. Therefore, when welding a thin plate and a thick plate, if the plates are welded vertically, the thin plate may be melted due to the welding temperature and welding may be difficult. Moreover, there is a possibility that the hermeticity of the welded portion is reduced, which may cause a reduction in strength. Therefore, as shown in (b), the bottom plate 12 is provided with a raised portion and bent so that the bottom plate 12 and the side plate of the body portion 13 are overlapped and welded. Thereby, the influence of the heat by the welding temperature to the side plate which comprises the trunk | drum 13 can be reduced, welding becomes easy, the airtightness of a welding part improves, and the strength improvement can also be aimed at. In addition, since the influence of heat on the bottom plate 12 can be reduced, the bottom plate 12 can be thinned.

  FIG. 14 is an explanatory view showing a welded portion between the flange and the body portion in the present embodiment. 14A shows a welded portion between the flange 11 and the body portion 13 in the configuration of FIG. 2 of the first embodiment, and FIG. 14B shows a welded portion between the flange 11 and the body portion 13 in the present embodiment. Is shown. As shown to (a), since the flange 11 uses the member which hollowed out the inside of the flange 11 as the baseplate 12 similarly to Example 1 and 2, it is the same board thickness as the baseplate 12, and comprises the trunk | drum 13 It is a board thicker than the side board. Therefore, similarly to the above, when the thin plate and the thick plate are welded while being vertically applied, the thin plate may be melted due to the welding temperature, and welding may be difficult. In addition, there is a possibility of a decrease in airtightness and a decrease in strength. Therefore, as shown in (b), a rising portion is provided on the side plate of the body portion 13 and bent, and the flange 11 and the side plate of the body portion 13 are overlapped and welded. Thereby, the influence of the heat by the welding temperature to the side plate which comprises the trunk | drum 13 can be reduced, welding becomes easy, the airtightness of a welding part improves, and the strength improvement can also be aimed at. In addition, since the influence of heat on the flange 11 can be reduced, the flange 11 can be thinned. In addition, the welding of the narrowed portion 15 of the body portion 13 which has been a problem in the second embodiment can also be solved.

  In addition, in order to use the member hollowed out in the flange 11 as the bottom plate 12, as shown in FIG. 12, the height of the rising portion of the side plate of the body portion 13 is higher than the height Lb of the rising portion of the bottom plate 12. By setting the length Lt to be large, it is possible to use the member hollowed out in the flange 11 as the bottom plate 12 and perform welding with the flange 11 and the side plate of the body portion 13 being overlapped.

  In addition, it is clear that the present embodiment can be applied even in the case where the body portion does not have a throttle portion in the first embodiment.

  As described above, in this embodiment, the side plate constituting the body portion is bent with the rising portion on the flange side, welded in a state where the flange and the side plate of the body portion are overlapped, and the bottom plate is raised. It has a raised portion and is bent, and is welded in a state where the bottom plate and the side plate of the body portion are overlapped inside the body portion.

  Thereby, the influence of the heat by the welding temperature to the side plate which comprises a trunk | drum part can be reduced, welding becomes easy, and the airtightness of a welding part improves and the strength improvement can also be aimed at. Further, since the influence of heat on the bottom plate and the flange can be reduced, the thickness can be reduced.

  10: Tank, 11: Flange, 12: Bottom plate, 13: Body part, 14: Leg part, 15: Throttle part, 16a: Insulation distance of interphase contact part, 16b: Necessary insulation distance, 20: Iron core-coil assembly, 21: Iron core, 22: Coil, 23: Primary coil part, 24: Secondary coil part, 25: Interphase contact part, 26: U phase, 27: V phase, 28: W phase, 30: Insulating oil, 40: Wave Rib, 50: Emboss

Claims (9)

An oil-filled transformer in which an iron core-coil assembly in which an iron core and a coil are assembled is stored in a tank and filled with insulating oil,
The tank is composed of a body portion including a flange for attaching a lid, a bottom plate, and a side plate. The flange is fixed by welding outside the body portion, and the bottom plate is fixed by welding inside the body portion. And
An oil-filled transformer, wherein the bottom plate uses a member cut out from a plate used for the flange. The oil-filled transformer according to claim 1,
The iron core-coil assembly includes a plurality of coils respectively attached to a plurality of legs of the iron core,
The body portion facing the portion where the plurality of coils are close to each other is provided with a throttle portion extending in the axial direction of the plurality of coils and recessed toward the portion where the plurality of coils are close to each other,
The flange is welded on the bottom plate side of the flange outside the body portion, except for the throttle portion, and the throttle portion is welded on the side opposite to the bottom plate side of the flange outside the body portion. Oil-filled transformer, characterized in that In the oil-filled transformer according to claim 1 or 2,
The oil-filled transformer, wherein the bottom plate is a member hollowed out from a plate used for the flange by a width equal to or greater than a thickness of the side plate. In the oil-filled transformer according to claim 1 or 2,
The body part has an oil-filled transformer in which the side plate has wave ribs. In the oil-filled transformer according to claim 1 or 2,
The body part is an oil-filled transformer in which the side plate has an emboss of a convex part or a concave part. In the oil-filled transformer according to claim 1,
The side plate constituting the body portion is bent and has a raised portion on the flange side, and the flange and the side plate of the body portion are welded in an overlapped state,
The bottom plate has a raised portion and is bent, and is welded in a state where the bottom plate and the side plate of the body portion are overlapped inside the body portion. An oil-filled transformer tank manufacturing method comprising:
The tank is composed of a body part composed of a flange for attaching a lid, a bottom plate, and a side plate,
The bottom plate is obtained by cutting out the plate used for the flange by a laser with a width equal to or greater than the thickness of the side plate,
The flange is fixed by welding outside the body part,
The method of manufacturing a tank of an oil-filled transformer, wherein the bottom plate is fixed by welding inside the body portion. In the manufacturing method of the tank of the oil-filled transformer according to claim 7,
The tank stores an iron core-coil assembly in which an iron core and a coil are assembled.
The iron core-coil assembly includes a plurality of coils respectively attached to a plurality of legs of the iron core,
The body portion facing the portion where the plurality of coils are close to each other is provided with a throttle portion extending in the axial direction of the plurality of coils and recessed toward the portion where the plurality of coils are close to each other,
The flange is welded on the bottom plate side of the flange outside the fuselage portion except for the throttle portion, and the throttle portion is welded on the opposite side of the flange outside the fuselage portion from the bottom plate side. A method of manufacturing a tank for an oil-filled transformer. In the manufacturing method of the tank of the oil-filled transformer according to claim 7,
The side plate constituting the body part is bent so as to have a raised part on the flange side, and the flange and the side part plate of the body part are welded in an overlapped state,
A method for manufacturing a tank of an oil-filled transformer, wherein the bottom plate is bent so as to have a raised portion, and is welded in a state where the bottom plate and the side plate of the body portion are overlapped inside the body portion.

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