JP2015070180A - Stationary induction electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction electric device including a core fastening structure that can suppress transmission of vibration to a closed container, by reducing the twist or the vibration amount in the bending mode of the stationary induction electric device body generated by the vibration of a core and a winging.SOLUTION: A stationary induction electric device includes an upper core fastening member 6 and a lower core fastening member 7 for fastening and fixing a core 3 in the lamination direction at the upper and lower ends thereof. The lower core fastening member 7 is fixed to a stay 8 arranged between the core 3 and the closed container bottom plate 21 in the core lamination direction, so that the ends project from the core lamination direction end. A support hole formed in the stay 8 and a support pole 9 disposed on the closed container bottom plate 21 are supported via an elastic stop swing ring.

Description

  Embodiments of the present invention relate to a noise reduction technique for a static induction electric appliance, and more particularly to a structure for supporting a static induction electric appliance body on a sealed container.

  In recent years, static induction appliances such as transformers and reactors have a structure in which a large electric field and a large magnetic field energy are confined in a smaller space with an increase in capacity, size, and weight, resulting in increased vibration and noise. Tend.

  In general, the noise of a static induction machine is mainly due to the vibration of a static induction machine body mainly composed of a winding and an iron core, and the vibration of a closed container provided so as to cover the stationary induction machine body through a solid propagation path and a propagation path in oil. The vibration is propagated to the bottom plate and the side plate, and when these are vibrated, noise is radiated outside the sealed container.

  Conventionally, as a means for reducing such noise, there is a method of reinforcing a structure or a closed container that covers a stationary induction appliance with a structure such as a soundproof tank, a soundproof building, or a soundproof wall made of steel plate or concrete. . However, since the vibration source is a static induction electric body having a winding and an iron core, it is necessary to reduce the vibration of the static induction electric body.

  There are many ways to reduce the vibration of the static induction electrical machine body, including electromagnetic vibration reduction measures in the winding axis direction of the winding and excitation vibration reduction of the iron core. Mainly measures were taken to prevent run-out during transportation. However, since the iron core and the winding have a laminated structure, the rigidity in the laminating direction is lowered, so that a higher-order vibration mode may appear due to energization and excitation.

JP 2005-32814 A JP-A-6-84659

  In order to improve the problems as described above, there has been proposed a vibration isolation structure for reducing the amount of vibration transmitted from the stationary induction main body to the sealed container side plate via the sealed container bottom plate.

  For example, in Patent Document 1, the inverted V-shaped seismic members installed at the left and right ends of the iron core are provided with a stay portion at the lower end and fixed to the foundation with a foundation bolt, and the upper end is connected to the upper core fastening member. We have proposed a method to reduce the vibration of the transformer body in the left-right direction and the front-rear direction during an earthquake.

  In patent document 2, the method of reducing the transformer noise by the vibration of an iron core coupling | bond part is proposed by pressing down the coupling | bond part of a yoke and the iron core which consists of a step-like silicon steel plate with a pressing plate.

  However, although these structures can reduce the vibration of the falling mode of the static induction electric appliance body, there is a problem that the effect cannot be expected for the torsion mode and the bending mode which are higher order vibration modes. .

  The present invention has been made in order to solve the above-described problems, and reduces the amount of vibration of the static induction electric device main body caused by vibration of the iron core and windings and the vibration amount of the bending mode, and transmits vibration to the sealed container. It aims at providing the static induction electric machine provided with the iron core fastening structure which can be suppressed.

  In order to solve the above-described problems, a stationary induction device according to an embodiment of the present invention includes a sealed container that is filled with an insulating medium and includes a sealed container bottom plate, and a plurality of upright and planarly extending pieces within the sealed container. An iron core configured by laminating electromagnetic steel sheets; a winding wound around the iron core in the sealed container; and the outer side of both sides of the stacking direction at the upper end in the vertical direction of the iron core in the sealed container. Two upper core fastening members extending horizontally along the magnetic steel sheet, and two horizontally extending along the magnetic steel sheet outside the both sides of the stacking direction at the lower end in the vertical direction of the iron core in the sealed container. A lower iron core fastening member, a support column fixedly disposed on the bottom plate of the closed container and projecting upward; and fixed to the two lower iron core fastening members to support the lower iron core fastening member; On the bottom plate of the closed container that extends horizontally in the stacking direction A stay portion formed with a support hole for receiving the support column; and an elastic steadying ring disposed around the support column in the support hole. Is supported by the support column in the horizontal direction through the steady ring in the support hole.

1 is a cross-sectional plan view of a static induction device according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. 3 is a sectional view taken along the line III-III in FIG. 1. The plane sectional view of the stationary induction machine concerning a 2nd embodiment of the present invention. The plane sectional view of the static induction appliance concerning the modification of the 2nd embodiment of the present invention. The elevation sectional view of the static induction appliance concerning the modification of the 2nd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A first embodiment of a static induction electric machine according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan sectional view showing a schematic configuration of a static induction electric appliance which is one example of application of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 3 is a vertical sectional view taken along line III-III in FIG.

  In the figure, a stationary induction electric body 11 having an iron core 3 and a winding 2 is housed in a sealed container 1. The internal space of the hermetic container 1 is filled with an insulating medium 5 for insulating and cooling the stationary induction main body 11. As the insulating medium 5, for example, liquid such as insulating oil, air, gas, or air is used.

  The sealed container 1 is, for example, a rectangular parallelepiped container, and includes a sealed container bottom plate 21, a sealed container side plate 31, and a sealed container top plate 41.

  The iron core 3 is formed by laminating a plurality of electromagnetic steel plates 3a that stand upright and spread in a planar shape, and is fastened and fixed in the laminating direction by an upper iron core fastening member 6 and a lower iron core fastening member 7 provided at the upper and lower ends in the vertical direction. Has been. The upper iron core fastening member 6 and the lower iron core fastening member 7 each extend horizontally along the outside of the laminated electromagnetic steel plates 3 a, that is, in the longitudinal direction of the iron core 3.

  The winding 2 is wound around the vertical axis of the iron core 3 to form a cylindrical shape. The winding 2 is fastened and fixed in the vertical direction by an upper iron core fastening member 6 and a lower iron core fastening member 7 via a winding fastening member 4 made of an insulating material provided at both ends of the winding shaft in the vertical direction. ing.

  Further, the lower iron core fastening member 7 is fixed to a stay portion 8 provided at the lower part of the iron core 3 over the iron core lamination direction by welding or the like. The stay portion 8 extends horizontally in the iron core lamination direction. In the example shown in FIG. 1, two stay portions 8 are arranged at both ends of the iron core 3 in the longitudinal direction.

  Support holes 81 penetrating in the vertical direction are provided at both ends of each stay portion 8. On the other hand, a cylindrical support column 9 is fixed to the sealed container bottom plate 21 in the vertical direction as shown in FIG. Here, the inner diameter of the support hole 81 is formed to be slightly larger than the outer diameter of the support column 9.

  Next, a method for supporting the stay portion 8 to the sealed container bottom plate 21 will be described. A support hole 81 provided in the stay portion 8 is arranged so that the support column 9 of the hermetic container bottom plate 21 is inserted, and a gap between the support hole 81 and the support column 9 is made of an antisway made of an insulating material having elasticity. The ring 10 is inserted so as to fill the gap, and the stay portion 8 is supported by the sealed container bottom plate 21 via the steady ring 10 and the support pillar 9.

  In general, in a static induction appliance, vibration generated from the static induction appliance main body 11 by energization is transmitted to the sealed container bottom plate 21 via the lower iron core fastening member 7, and further from the sealed container bottom plate 21 to the sealed container side plate 31. The air is transmitted to the outside of the airtight container 1 as noise due to vibration of the airtight container side plate 31.

  In the present embodiment, there is no gap between the support hole 81 of the stay portion 8 and the support pillar 9 provided in the closed container bottom plate 21 by interposing the steady ring 10. The inner side and the outer side are in close contact with the support column 9 and the support hole 81, so that a frictional force is generated on the contact surface, and the stay portion 8 is restrained in both the circumferential direction and the axial direction of the support column 9. Further, since the steadying ring 10 is made of an elastic material, it is possible to suppress the vibration of the stationary induction main body 11 from being transmitted to the sealed container bottom plate 21 via the stay portion 8.

  As a result, the relative displacement generated between the stationary induction electric device main body 11 and the closed vessel bottom plate 21 is reduced, and the vibration based on the torsion mode of the iron core stacking direction vibration of the stationary induction electric device main body 11 and the bending mode of the iron core vertical direction and stacking direction vibration. The amount can be reduced.

  Further, in the present embodiment, the inner diameter of the support hole 81 formed in the stay portion 8 is made larger than the outer shape of the support column 9 formed in the closed container bottom plate 21, and the elastic ring 10 having elasticity is inserted in the gap. Therefore, it is not necessary to design the assembly accuracy of the support column 9 and the support hole 81 high.

  The anti-rest ring 10 may be installed by inserting the support hole 81 of the stay portion 8 into the support column 9 of the sealed container bottom plate 21 and then driving the anti-rest ring 10 or by attaching the anti-rest ring 10 to the support hole 81 in advance. Then, the stay portion 8 may be installed by inserting and fixing. The steady rest ring 10 shown in FIG. 3 may be made of a single material insulating material, or may be formed by bonding a ring made of a plurality of types of insulating materials in the radial direction or the axial direction. good. By combining rings made of materials having different rigidity, it is possible to give a cushioning effect and a load bearing effect to the steady ring 10.

  In the present embodiment, the form in which the steady-state structure of the stationary induction main body 11 is formed on the sealed container bottom plate 21 is shown. However, the support pillar 9 is formed on the sealed container top plate 41 and the sealed container side plate 31 to perform the present embodiment. The same effect can be obtained by supporting the stationary induction electric body 11 using the steady ring 10 as in the embodiment.

  As described above, according to the present embodiment, the stay portion 8 that fixes the lower iron core fastening member 7 is supported by the hermetic container bottom plate 21 via the elastic steadying ring 10. As a result, a frictional force is generated on the contact surface between the support hole 81 and the steadying ring 10 provided in the stay 8 and the support column 9 and the steadying ring 10 provided in the sealed container 1, and the stationary induction main body 11. The relative displacement generated between the closed container bottom plate 21 is reduced. Thereby, it is possible to reduce the amount of vibration based on the twist mode in the iron core stacking direction of the stationary induction electric body 11 and the bending mode in the iron core vertical direction.

  As a result, the amount of vibration transmitted from the stationary induction main body 11 to the sealed container side plate 31 through the sealed container bottom plate 21 is reduced, and noise radiated to the outside of the sealed container 1 through the sealed container side plate 31 is reduced. . Therefore, a large soundproof structure that covers the sealed container 1 in which the stationary induction main body 11 is accommodated is not required or can be simplified. Thereby, the whole static induction machine can be made compact.

(Second Embodiment)
Next, a second embodiment of the static induction electric machine according to the present invention will be described with reference to FIG. The vibration generated in the stationary induction body 11 is caused by the vibration in the winding axis direction of the winding 2 generated from the winding 2 through the winding fastening member 4 and the upper core fastening member 6 and the lower core fastening member 7. The bending vibration mode is generated in the upper iron core fastening member 6 and the lower iron core fastening member 7. When vibration in the primary bending mode occurs in the stacking direction of the iron core 3 by energization, the amplitude near the center in the longitudinal direction of the iron core 3 increases.

  For this reason, in this embodiment, as shown in FIG. 4, by providing the stay portions 8 that support the lower core fastening member 7 in the vicinity of the longitudinal end portion and the central portion of the iron core 3, 11 can reduce the vibration amount of the antinode of the first bending mode in the iron core lamination direction.

  Further, at least one of the steady rest support portions of the three stay portions 8 is installed on the opposite side of the stationary induction electric appliance main body 11 in the iron core lamination direction. When the static induction main body 11 is in the torsion mode of the vibration in the iron core lamination direction, the rotation axis does not coincide with the rotation axis in the torsion mode, and this configuration can reduce the vibration amount in the torsion mode. Further, the number and arrangement of the stay portions 8 provided on the bottom portion of the iron core 3 can be appropriately selected in accordance with the generated vibration mode.

  FIG. 5 shows a structure in which stay portions 8 are provided at five locations in the longitudinal direction of the iron core, three are provided in the iron core lamination direction rear surface, and two are provided with an anti-sway support portion on the iron core lamination direction front surface. By arranging the stay portion 8 in consideration of the vibration mode in this way, the vibration amount of the stationary induction electric appliance main body 11 is reduced, and the vibration transmission to the sealed container bottom plate 21 is suppressed, and the sealed container 1 is radiated. Noise can be reduced.

  In addition, about the support part of each stay part 8, it does not necessarily need to provide in the lamination direction both ends of the iron core 3, and you may make it provide a support part only in one side, as shown in FIG. 4 or FIG. By doing in this way, the number of support parts can be reduced and the number of manufacturing steps can be reduced.

  Further, as shown in FIG. 6, by inserting an elastic sheet plate 12 between the stay portion 8 and the closed container bottom plate 21, a fall due to contact imbalance in the steady portion of the stay portion 8 and the stay can be prevented. Vibration transmitted directly from the portion 8 to the sealed container bottom plate 21 can be suppressed.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. For example, the present invention may be applied to improve the noise reduction effect in other power devices / devices other than the transformer. Moreover, you may combine the characteristic of each embodiment. Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Airtight container 2 ... Winding 3 ... Iron core 3a ... Electrical steel plate 4 ... Winding fastening member 5 ... Insulation medium 6 ... Upper iron core fastening member 7 ... Lower iron core fastening member 8 ... Stay part 9 ... Supporting column 10 ... Anti-rest ring 11 ... Stationary induction electric machine body 12 ... Sheet plate 21 ... Sealed container bottom plate 31 ... Sealed container side plate 41 ... Sealed container top plate 81 ... Support hole

Claims (5)

A sealed container filled with an insulating medium and provided with a sealed container bottom plate;
In the sealed container, an iron core configured by laminating a plurality of electromagnetic steel plates that stand upright and spread in a planar shape,
A winding wound around the iron core in the sealed container;
Two upper core fastening members extending horizontally along the magnetic steel sheet outside the both sides of the stacking direction at the upper end in the vertical direction of the iron core in the sealed container;
In the sealed container, two lower core fastening members extending horizontally along the magnetic steel sheet outside both sides of the stacking direction at the lower end in the vertical direction of the iron core,
A support column fixedly arranged on the bottom plate of the closed container and projecting upward;
A support hole that is fixed to the two lower core fastening members to support the lower core fastening member, extends horizontally in the stacking direction of the iron cores, is supported on the sealed container bottom plate, and receives the support pillars A stay section formed with
An anti-rest ring that is arranged so as to surround the support pillar in the support hole and has elasticity,
Have
The stationary induction device, wherein the stay portion is supported in a horizontal direction by the support column via the steady ring in the support hole. In the iron core, the horizontal direction along the surface where the electromagnetic steel sheet spreads forms the longitudinal direction,
The stationary induction device according to claim 1, wherein the stay portion is disposed in at least two places in the longitudinal direction of the iron core.   3. The stationary induction device according to claim 1, wherein at least one of the stay portions is disposed at a longitudinal position corresponding to a vibration mode antinode of vibration in the stacking direction of the iron core.   The stationary induction device according to any one of claims 1 to 3, wherein the steady ring is formed by stacking a plurality of insulating rings.   5. The stationary induction device according to claim 1, further comprising an elastic sheet plate interposed between the stay portion and the sealed container bottom plate. 6.

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