JP2015008173A - Stationary induction electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction electric device having a sealed container structure capable of reducing noises with a simple constitution without adding extra structure to the inside or outside of the sealed container of the stationary induction electric device.SOLUTION: The stationary induction electric device includes: an iron core 3 constituted of plural electromagnetic steel plates 3a expanding in a horizontal longitudinal direction and a vertical direction of the horizontal iron core, which are laminated in a horizontal shorter direction of the iron core perpendicular to a horizontal longitudinal direction of the iron core; a stationary induction electric device main body 23 including a winding 2 wound on the iron core 3; and a sealed container 1 constituted of a polyhedron having seven or more planes for storing the stationary induction electric device main body 23 and an insulation medium 4 encapsulated therein.

Description

  Embodiments of the present invention relate to a static induction electric device represented by a transformer or a reactor, and in particular, a static induction electric appliance having a configuration for suppressing a radiated sound caused by plate vibration of a sealed container that accommodates a main body of a static induction electric appliance. About.

  In recent years, static induction appliances such as transformers and reactors have a structure in which the energy of a large electric field or magnetic field is confined in a smaller space due to large capacity, small size, and light weight. There is a tendency to grow.

  In general, the noise of a static induction device is that vibration generated in the main body of a static induction device propagates to a closed container that houses the main body of the static induction device when energized, and the plate surface of the closed container vibrates and radiates as sound to the outside. Makes noise.

  Here, the structure of a general static induction appliance will be described with reference to FIGS.

  FIG. 10 is an elevational cross-sectional view perpendicular to the horizontal horizontal direction of the iron core showing a schematic configuration of a conventional general static induction electric machine. 11 is a horizontal cross-sectional view showing a schematic configuration of the static induction appliance of FIG. 10, and FIG. 12 is a vertical cross-sectional view perpendicular to the longitudinal horizontal direction of the iron core showing the schematic configuration of the static induction appliance of FIGS. is there.

  In these drawings, the static induction electric device includes a static induction electric device main body 23, a sealed container 1 that accommodates the stationary induction electric device main body 23, and an insulating medium 4 such as oil filled in the sealed container 1. Yes. The stationary induction main body 23 includes an iron core 3, a yoke fastening fitting 31 and a winding 2.

  The iron core 3 is configured by laminating a plurality of electromagnetic steel plates 3 a, and these electromagnetic steel plates 3 a are fastened to each other in the stacking direction by a yoke fastening fitting 31. Each electromagnetic steel plate 3a is a substantially rectangular flat plate extending in the vertical direction, and has two openings. By laminating these electromagnetic steel sheets 3a, the outer shape of the iron core 3 is substantially rectangular parallelepiped, and the main pillar extending in the vertical direction at the center by the two openings formed therein, and the main pillar Two side columns extending in parallel with the main column at both ends and two yokes extending in the horizontal direction for connecting the main column and the side columns at the upper and lower ends are formed.

  In the following description, the horizontal direction in which the electromagnetic steel sheet 3a spreads is called the iron core horizontal longitudinal direction, and the horizontal direction perpendicular to the iron core horizontal longitudinal direction, that is, the lamination direction of the electromagnetic steel sheets 3a is called the iron core horizontal short direction.

  A cylindrical insulating cylinder is disposed on the main pillar of the iron core 3, and a cylindrical winding 2 is wound around the insulating cylinder.

  The sealed container 1 is a substantially rectangular parallelepiped container, and includes a top plate 1b, a bottom plate 1d, and four side plates 1a connected to the top plate 1b and the bottom plate 1d. Of the four side plates 1a, the two side plates 1a facing each other spread in the iron core horizontal longitudinal direction, and the other two side plates 1a corresponding to each other spread in the iron core horizontal short direction.

  The stationary induction device main body 23 is placed and fixed on the bottom plate 1d of the hermetic container 1 via a support member 23d disposed on the bottom thereof.

  When vibration in the vertical direction of the winding 2 occurs, the vibration of the stationary induction main body 23 is caused by the yoke clamp 31 that clamps the electromagnetic steel plate 3a constituting the iron core 3 in the stacking direction, and the support member 23d and the sealed container 1. The vibration is transmitted to the sealed container 1 via the contact surface with the bottom plate 1d, the vibration is transmitted to the bottom plate 1d, the side plate 1a and the top plate 1b of the sealed container 1, and the plate surface vibrations of the bottom plate 1d, the side plate 1a and the top plate 1b are transmitted. Generated and emitted as noise. In addition, the vibration of the stationary induction main body 23 is transmitted to the side plate 1a, the bottom plate 1d, and the top plate 1b constituting the sealed container 1 through the insulating medium 4, and noise is generated by the plate surface vibration of the side plate 1a, the bottom plate 1d, and the top plate 1b. Is emitted.

  In this way, noise generated from the stationary induction unit is radiated from the sealed container to the outside, so conventional noise reduction technology is still possible with a soundproof tank, soundproof building, soundproof wall, etc. made of steel plate or concrete. There is a structure that covers the induction machine, but these methods have problems such as extra installation space and construction time.

JP 2000-260627 A Japanese Patent Laid-Open No. 11-3825 JP 2000-315609 A

  In order to solve such a problem, in a vibration transmission path that passes through the bottom plate, side plate, and top plate of the sealed container, a method of reinforcing the corner portion of the sealed container with a prismatic member of the same material, or in vibration oil In the propagation path, attach a weight member to a part that is likely to vibrate, install a sound absorbing material around it, or add vibration stays and vibration-damping steel plates to the side plate of the sealed container against vibration transmitted from the side plate to the sound insulation plate. A method of attaching a heavy member or the like has been proposed.

  In addition, a prismatic member made of the same material as the side plate is attached to the joint between the side plate and the bottom plate of the sealed container, or the stationary induction electric device supported by the top plate and the joint between the top plate and the side plate of the sealed container is tightened. There is also a method of attaching and integrating a prismatic member made of the same material as the top plate between the stud portion. As a result, the vibration generated in the static induction body consisting of windings and iron core can be attenuated by reducing the area of the vibration surface of the sealed container structure, which increases the size and cost of the static induction machine. The generated noise can be reduced while minimizing the problems such as.

  In addition, an additional weight member is attached to the outer vibration-prone portion such as the side plate of the sealed container that is in direct contact with the insulating oil, which is the insulating medium, and the additional weight member By concentrating on the attached part and attaching the sound absorbing material and the soundproofing plate only on the outside thereof, the noise caused by the vibration propagation in oil can be reduced. As a result, it is possible to design a sealed container without being restricted by the strength calculation of the sealed container against the internal pressure, and by adjusting the natural frequency of the sealed container by changing the weight of the additional weight member, it is possible to avoid resonance and reduce noise. The effect is improved, and the mounting area of the soundproof plate can be reduced.

  In addition, by providing reinforcement stays at regular intervals on the outside of the airtight container side plate, it is possible to suppress vibrations related to the vibration transmission path from the main body of the static induction appliance to the damping steel plate, and to be attached to the outside of the reinforcement stay Is composed of a thin steel plate coated with a damping paint or the like, a damping steel plate and a frame-like weight body, so that the vibration transmissibility can be reduced and the vibration radiation sound of the sound insulating plate can be reduced.

  However, these structures can reduce radiation noise from the side plate of the hermetic container while minimizing the increase in size and cost of the static induction electric machine as compared with the conventional structure, but the hermetic structure constituting the static induction electric machine. Since a new structure is installed inside or outside the container, a new installation space is required, and the number of parts increases, so that construction time is also required. As a result, there was a problem that it led to an increase in cost and construction period.

  The embodiment of the present invention is made to solve the above-described problem, and by making the shape of the closed container of the stationary induction appliance difficult to transmit vibration and having a structure that can suppress plate surface vibration of the closed container. It is an object of the present invention to provide a static induction device having a hermetic container structure that is simpler and can reduce noise without adding a new structure inside or outside the hermetic container.

  In order to solve the above-mentioned problems, a static induction electric appliance according to an embodiment of the present invention is configured by laminating a plurality of electromagnetic steel sheets extending in the horizontal horizontal direction of the core and in the vertical direction in the horizontal horizontal direction perpendicular to the horizontal horizontal direction of the core. A stationary induction electric body having an iron core configured as described above, and a winding wound around the iron core, and a polyhedron having seven or more faces, containing the stationary induction electric body and encapsulating an insulating medium An airtight container.

  By increasing the number of surfaces constituting the sealed container in this way, the number of nodes of the plate surface vibration of the sealed container can be increased and the vibration per surface of the sealed container can be suppressed, so the generated vibration energy is the same. Even if there is, it is possible to suppress the radiated sound based on the plate vibration of the sealed container, and there is no need to provide a separate structure such as a soundproof wall, soundproof building, vibration suppression member, etc., and a large noise reduction effect can be obtained in a small space Can do.

  Further, in the embodiment of the present invention, the sealed container is composed of a top plate, a side plate, and a bottom plate, and at least the sealed container plate surfaces that are most susceptible to plate surface vibrations based on vibrations generated from the stationary induction main body are mutually connected. It is characterized by comprising two or more surfaces that are not on the same plane.

  By configuring in this way, it becomes possible to suppress the vibration of the airtight container plate surface that is most susceptible to the vibration generated by the static induction appliance, and more effectively suppress the radiated sound based on the plate surface vibration. it can.

1 is a horizontal sectional view showing a configuration of a static induction electric device according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a sealed container of a stationary induction device according to a first embodiment of the present invention. The elevation sectional view perpendicular to the iron core horizontal longitudinal direction which shows the composition of the stationary induction machine concerning a 2nd embodiment of the present invention. The external appearance perspective view of the airtight container of the static induction appliance which concerns on the 2nd Embodiment of this invention. The horizontal sectional view showing the composition of the static induction machine concerning a 3rd embodiment of the present invention. The elevation sectional view perpendicular to the iron core horizontal longitudinal direction which shows the composition of the static induction appliance concerning a 3rd embodiment of the present invention. The external appearance perspective view of the airtight container of the static induction appliance which concerns on the 3rd Embodiment of this invention. The graph which shows the relationship between the horizontal-to-vertical dimension ratio of a side plate, and the natural mode of a plate surface vibration about the case where an airtight container is a rectangular parallelepiped shape. The image figure which shows typically the mode deformation | transformation in the vibration of the side plate of an airtight container about the case where an airtight container is a rectangular parallelepiped shape. Fig. 3 is a vertical sectional view perpendicular to the horizontal horizontal direction of the iron core showing a schematic configuration of a general static induction electric appliance. FIG. 11 is a horizontal cross-sectional view showing a schematic configuration of the stationary induction device of FIG. 10. FIG. 12 is a vertical sectional view perpendicular to the horizontal horizontal longitudinal direction of the iron core, showing a schematic configuration of the static induction appliance of FIGS. 10 and 11.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, parts common or similar to those in the prior art shown in FIGS. 10 to 12 are denoted by common reference numerals, and redundant description is omitted.

  In the present embodiment, the structure of a sealed container made of a polyhedron that is installed around an stationary induction electric device body serving as a vibration source via an insulating medium in a static induction device typified by a transformer or a reactor will be described.

(First embodiment)
In the first embodiment of the present invention, the configuration of a static induction electric device in which a static induction electric device body having a winding and an iron core is housed in a sealed container filled with an insulating medium will be described as an example. Will be described with reference to FIG.

  FIG. 1 is a horizontal cross-sectional view showing the configuration of the static induction electric appliance according to the first embodiment, and shows a horizontal cross-sectional view along the horizontal horizontal longitudinal direction of the iron core including the winding axis direction center line of the hermetic container. FIG. 2 is an external perspective view of the sealed container of the stationary induction device according to the first embodiment, and schematically shows the state of plate vibration based on a typical vibration mode of the sealed container with a dotted line. .

Here, when a minute element at an arbitrary point (x _i , y _i ) on the plate vibrates at a speed v _s (x _i , y _i ), the sound pressure at a location (x, y, z) away from r _i Can be represented by Formula (1). However, i is an integer, ω is vibration acceleration, ρ ₀ is the density of the sound propagation medium, and S is the area of the vibration surface, that is, the plate surface constituting the sealed container.

That is, the sound pressure by the plate surface vibration of finite elastic plate is proportional to the area S of the magnitude and direction of the plane of vibration of the vibration velocity v _s. For a closed container with a low noise structure, if the height of the container is constant, the vibration area is determined by the width of the side of the horizontal section.

  In the first embodiment, the structure of the stationary induction main body 23 is the same as that of the above-described conventional technique shown in FIGS. In this embodiment, the horizontal cross-sectional shape of the hermetic container 1 is hexagonal, and the side plate 1a of the hermetic container that is arranged facing the iron core horizontal longitudinal direction is bent along the iron core horizontal longitudinal direction (width direction). And two or more planes that are not on the same plane. Moreover, in this embodiment, it arrange | positions so that the vertex of a hexagon may be located on the centerline of the iron core 3 horizontal horizontal direction of an iron core.

  Here, the noise generated from the static induction electric body 23 having the winding 2 applied to the iron core 3 having a rectangular parallelepiped cross section is mainly from the center in the horizontal horizontal direction of the iron core 3 toward the outside in the horizontal horizontal direction of the iron core. It is known that the light propagates in the direction of the arrow X in FIG. 1 and the plate surface of the side plate 1a arranged in that direction vibrates most and becomes loud noise.

  By configuring the sealed container 1 as in the present embodiment, an effect of reducing the vibration amount of the side plate 1a provided along the horizontal horizontal longitudinal direction of the iron core that is most susceptible to the influence of the vibration source can be obtained. That is, according to this embodiment, the vibration area per one side plate 1a is smaller than that in the case where the horizontal cross-sectional shape is a quadrangle, and it is most susceptible to the noise generated from the stationary induction main body 23. This is because the vertex of the hexagon is located on the center line of the induction electric machine main body 23 in the horizontal horizontal direction of the iron core, so that the vibration node is located in the central portion of the stationary induction electric machine main body 23 in the horizontal horizontal direction.

  1 and 2 show the case where the hexagonal apex is located on the side plates 1a arranged on both the front side and the back side of the iron core 3 located on the center line in the horizontal longitudinal direction of the iron core. If this apex is provided with respect to at least one side plate 1a provided so as to oppose the iron core in the horizontal longitudinal direction, a noise reduction effect can be obtained. Moreover, although the case where the horizontal cross-sectional shape of the airtight container 1 is a hexagon was shown in FIG. 1 and FIG. 2, the horizontal cross-sectional shape of the airtight container 1 should just be a polygon more than a pentagon.

  Thus, when the horizontal cross-sectional shape of the sealed container 1 is a quadrangle, that is, compared to the case where the side plate 1a arranged opposite to the longitudinal direction of the iron core 3 of the stationary induction electric appliance body 23 is configured as a single piece, In the embodiment, since the horizontal cross-sectional shape of the sealed container 1 is a hexagon, the vibration area per side plate 1a is reduced, the sound radiation direction from the side plate 1a is also dispersed, and the vibration speed is the same. The radiated sound from the sealed container 1 becomes small.

  In the present embodiment, the horizontal cross-sectional shape of the sealed container 1 is a hexagon that is symmetrical with respect to the center line in the iron core horizontal longitudinal direction. However, the horizontal cross-sectional shape of the sealed container is, for example, a pentagon, and the center line in the iron core horizontal longitudinal direction. However, it is possible to reduce the radiated sound from the sealed container (not shown).

  That is, even if the vibration from the stationary induction main body is transmitted at the same level to the front and rear side plates provided facing the iron core horizontal longitudinal direction of the sealed container, the side plates located before and after the longitudinal center line of the iron core are Since it vibrates in different vibration modes, resonance between the side plates of the sealed container can be avoided. Thereby, the noise reduction effect can be expected. Even in the case of a polygon such as a heptagon or a nine-sided shape, the same effect can be obtained by making the horizontal cross-sectional shape asymmetric with respect to the center line in the iron core horizontal longitudinal direction.

  Here, the relationship between the horizontal / vertical dimension ratio of the side plate, the natural frequency, and the natural mode can be expressed by Expression (2).

  Where f: natural frequency, t: plate thickness, m: mode order in the horizontal direction of the plate surface, n: mode order in the vertical direction of the plate surface, a: lateral plate width dimension, b: side plate height dimension, c: sound velocity, ν: Poisson's ratio.

  According to equation (2), when the height dimension b and the thickness t of the side plate are constant, the lateral width dimension of the side plate can be determined according to the vibration mode (m, n) and the natural frequency f that are targets. .

  FIG. 8 is a graph showing the relationship between the horizontal-to-vertical dimension ratio of the side plate and the natural mode of plate surface vibration when the sealed container 1 has a rectangular parallelepiped shape. Here, the plate thickness of the side plate is 0.01 m, and the height of the side plate is constant at 3 m. FIG. 9 is an image diagram schematically showing mode deformation in vibration of the side plate. In FIGS. 9A, 9B, 9C, and 9D, the horizontal and vertical mode orders are (1, 1), (2, 1), and (1, 2), respectively. , (2, 2).

  For example, when the secondary mode is set in both the horizontal direction and the vertical direction at 100 Hz, it can be understood from the formula (2) that the lateral width of the side plate should be 1.04 m.

  Here, although the thickness of all the side plates is constant, it is needless to say that the present invention can be applied even when the thicknesses are different.

  In the present embodiment, by increasing the number of surfaces constituting the sealed container 1 in this way, the number of nodes of plate surface vibration of the sealed container 1 can be increased to suppress the vibration per surface of the sealed container 1. it can. Thereby, even if the generated vibration energy is the same, it is possible to suppress the radiated sound based on the plate surface vibration of the sealed container 1, and there is no need to separately provide a structure such as a soundproof wall, a soundproof building, a vibration suppressing member, A large noise reduction effect can be obtained in a small space.

  In the present embodiment, the sealed container 1 includes a top plate 1b, a side plate 1a, and a bottom plate 1d, and is most susceptible to plate surface vibrations based on vibrations generated from the stationary induction main body 23. The plate surface is composed of two or more surfaces that are not coplanar with each other.

  By comprising in this way, it becomes possible to suppress the vibration of the plate | board surface of the airtight container 1 which is most susceptible to the influence of the generation | occurrence | production vibration of a stationary induction | guidance | derivation electric appliance, and suppresses the radiation sound based on plate | board surface vibration more effectively. be able to.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 3 and FIG.

  FIG. 3 is a vertical cross-sectional view perpendicular to the horizontal horizontal longitudinal direction of the iron core showing the configuration of the stationary induction device according to the second embodiment. FIG. 4 is an external perspective view of a sealed container of a stationary induction device according to the second embodiment.

  In this embodiment, the structure of the stationary induction main body 23 is the same as that of the first embodiment, and is the same as the above-described conventional technique shown in FIGS. The state of plate surface vibration based on the vibration mode is schematically represented by a dotted line.

  In this embodiment, the vertical cross-sectional shape of the sealed container 1 is a hexagon. The hermetic container 1 is composed of side plates 1a and 1c, a top plate 1b, and a bottom plate 1d, and the vertical cross-sectional shape is a hexagon.

  Here, the noise generated from the stationary induction main body 23 propagates mainly in the direction of arrow Y shown in FIG. 3, that is, from the center of the iron core 3 in the horizontal horizontal longitudinal direction of the iron core, and the side plate disposed in that direction. The plate surface vibrates most and becomes a loud noise and is radiated to the outside. For this reason, in this embodiment, the side surface 1a, 1c of the airtight container arrange | positioned facing hexagonal and the iron core horizontal longitudinal direction is two in the height direction. It is composed of two planes that are bent and are not coplanar with each other.

  In this embodiment, by making the vertical sectional shape of the sealed container 1 hexagonal, the vibration area per one side of the sealed container side plate having the greatest influence of the vibration source can be reduced as in the first embodiment. Therefore, the radiation noise from the sealed container 1 can be reduced.

  In addition, the hexagonal apex of the vertical section of the sealed container 1 is configured to be located near the center line in the height direction of the iron core 3, so that the hexagonal apex becomes a node of vibration, effectively radiating sound from the side plate. Can be reduced.

  In addition, although this embodiment demonstrated the case where the shape of an iron core horizontal longitudinal direction vertical cross section containing the axial centerline of the coil | winding 2 of the airtight container 1 was a hexagon, it is comprised so that a cross-sectional shape may become a polygon more than a pentagon. In addition, the case where the cross-sectional shape of the sealed container is symmetric with respect to the axial center line of the winding 2 has been described. Also good.

  By making the cross-sectional shape of the hermetic container 1 asymmetric with respect to the axial center line of the winding 2, the resonance frequency can be changed by changing the aspect ratio of each side plate. It is possible to reduce.

  According to the second embodiment described above, the same effects as those of the first embodiment can be obtained.

(Third embodiment)
FIG. 5 is a horizontal cross-sectional view showing a configuration of a static induction apparatus according to the third embodiment. FIG. 6 is a vertical sectional view perpendicular to the horizontal horizontal direction of the iron core showing the configuration of the stationary induction device according to the third embodiment, and FIG. 7 is an external view of the sealed container of the stationary induction device according to the third embodiment. It is a perspective view.

  In this embodiment, the structure of the static induction electric appliance main body 23 is the same as that of the first and second embodiments, and is the same as that of the above-described prior art shown in FIGS.

  In this embodiment, the vertical cross-sectional shape of the sealed container 1 is a polygon that is a pentagon or more, and the horizontal cross-sectional shape is a polygon that is a pentagon or more. In the illustrated example, the vertical cross-sectional shape of the sealed container 1 is an octagon, and the horizontal cross-sectional shape is a hexagon.

  In this way, the horizontal cross section and the vertical cross section of the sealed container are both configured to be a polygonal cross section of a pentagon or more, so that the area of the vibration surface of each side plate can be reduced and resonance of the side plate can be avoided. Thus, the radiated sound from the sealed container can be reduced.

  According to the third embodiment described above, the same effects as those of the first or second embodiment can be obtained.

(Other embodiments)
As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. 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 their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Sealed container 1a, 1c ... Side plate 1b ... Top plate 1d ... Bottom plate 2 ... Winding 3 ... Iron core 3a ... Electromagnetic steel plate 4 ... Insulating medium 23 ... Stationary induction electric appliance main body 23d ... Support member 31 ... Yoke clamping metal fitting

Claims (5)

Stationary induction comprising a core formed by laminating a plurality of electrical steel sheets extending in the horizontal horizontal direction of the core and in the vertical direction in the horizontal horizontal direction perpendicular to the horizontal horizontal direction of the core, and a winding wound around the core The electrical appliance body,
A sealed container configured to be a polyhedron having seven or more faces, containing the stationary induction main body and encapsulating an insulating medium;
Having a static induction machine.   The stationary induction apparatus according to claim 1, wherein the sealed container is configured such that a horizontal cross-sectional shape is a pentagon or more polygon.   The stationary structure according to claim 2, wherein at least one vertex of the polygon of the horizontal cross-sectional shape of the sealed container is present at a position facing a central portion in the horizontal horizontal direction of the iron core. Induction machine.   The stationary induction device according to any one of claims 1 to 3, wherein a vertical cross-sectional shape of the sealed container perpendicular to the horizontal transverse direction of the iron core is a pentagon or more polygon. .   5. The stationary induction device according to claim 4, wherein at least one vertex of the polygon of the vertical cross-sectional shape of the sealed container is present at a position facing a central portion in the vertical direction of the iron core.

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