JP2015177085A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that when a transformer shakes due to earthquake, the upper end side of the transformer shakes significantly with the lowe end side as a fulcrum, and since a coil stand, and the like, provided in the transformer drop off due to shaking, and thereby the winding also drops off.SOLUTION: A mold transformer 1 is constituted of a core 2, a winding 3, and an upper core fastener 4a and a lower core fastener 4b provided, respectively, at an upper part and lower part of the core 2. The core is a wound core constituted of an upper yoke 2b interconnecting a leg 2a and the upper ends thereof, and a lower yoke 2c interconnecting the lower ends of the leg 2a. A slip member 6 is provided between the lamination plane of the lower yoke and the lower core fastener, and a friction member 7 is provided between the lamination plane of the upper yoke and the upper core fastener. With such a configuration, the fulcrum of shaking is never located on the lower end side, and thereby shaking of a mold transformer can be suppressed.

Description

The present invention relates to a structure that suppresses shaking of a transformer due to an earthquake in a transformer composed of an iron core, windings, and upper and lower cores.

  As a prior art related to the present invention, FIG. 3 (A) shows a front view of the molded transformer described in FIG. In Patent Document 1, a three-phase mold transformer is shown. However, in order to simplify the description, FIG. 3A illustrates the structure of a single-phase mold transformer as an example.

  Reference numeral 1 denotes a molded transformer, which is mainly composed of an iron core 2 and a winding 3. The winding 3 is coated with mold resin and wound around the iron core 2. An upper core fastening 4a and a lower core fastening 4b are disposed at the upper end and the lower end of the iron core 2, respectively.

  A coil base 5 is provided between the upper core fastening 4 a and the upper end of the winding 3 and between the lower core fastening 4 b and the lower end of the winding 3.

  An anti-vibration rubber 10 is attached to the lower end of the lower core fastening 4 b, and a base 11 is attached to the lower end of the anti-vibration rubber 10. The base 11 is attached to the ground with anchor bolts (not shown).

  The mold transformer is swayed in various directions by an earthquake. The transformer has a structure that easily swings toward the front and back of the sheet of FIG. However, depending on the direction of the shaking of the earthquake, there is a case where it shakes greatly in the left-right direction of the paper surface of FIG. 3 (A), which is shown in FIG. 3 (B).

JP-A-56-81910

  As shown in FIG. 3 (B), when the earthquake greatly shakes in the horizontal direction of the paper, the lower end of the mold transformer or the upper end of the mold transformer is greatly shaken with the lower core tightening as a fulcrum. That is, since the fulcrum of the swing is on the lower end side of the mold transformer, the swing on the upper end side is increased, causing a problem that the coil stand falls off.

An object of this invention is to provide the transformer which can suppress a shake also in the case of an earthquake.

In order to achieve the above object, the invention of claim 1
In a transformer constituted by an iron core, a winding, and an upper core fastening and a lower core fastening provided respectively on the upper and lower portions of the iron core,
It is a transformer in which a sliding member is provided between the lower part of the iron core and the lower core.

The invention of claim 2 is characterized in that the iron core is a substantially rectangular wound iron core made of a laminate of thin plates.
A leg part, an upper yoke part connecting the upper ends of the leg parts, and a lower yoke part connecting the lower ends of the leg parts,
The transformer according to claim 1, wherein a lower core clamp is in contact with each laminated surface of the lower yoke portion via the sliding member.

  The invention according to claim 3 is the transformer according to claim 1 or 2, wherein the sliding member is a bake plate, an iron plate, or a stainless plate.

  A fourth aspect of the present invention is the transformer according to any one of the first to third aspects, wherein a support member is provided between the upper portion of the iron core and the upper core clamp.

The invention of claim 5 is a transformer constituted by an iron core, a winding, and an upper core fastening and a lower core fastening provided respectively in the upper part and the lower part of the iron core.
A transformer in which an elastic body is interposed between a lower portion of the iron core and a lower core fastening.

  The invention according to claim 6 is the transformer according to claim 5, wherein the elastic body is made of rubber, and is interposed between each laminated surface of the lower yoke portion of the iron core and the lower core fastening.

  According to a seventh aspect of the present invention, in the transformer according to any one of the fifth to sixth aspects, a support member is provided between the upper part of the iron core and the upper core fastening.

  According to the present invention, since the fulcrum of shaking does not become the lower end side even in the event of an earthquake, the shaking of the transformer can be suppressed.

(A) shows the side view of the mold transformer in the 1st embodiment of the present invention, and (B) shows the front view. (A) shows the side view of the mold transformer in the 2nd Embodiment of this invention, (B) shows the front view. (A) shows the front view of the conventional mold transformer, and (B) shows the state of shaking during an earthquake.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes a molded transformer, which includes an iron core 2 and a winding 3. The iron core 2 includes two leg portions 2a extending in the vertical direction, an upper yoke portion 2b that connects the upper ends of the two leg portions 2a, and a lower yoke portion 2c that connects the lower ends of the two leg portions 2a. It consists of The iron core 2 is a laminated iron core in which a plurality of thin steel plates are stacked, and has a rectangular shape.

  A substantially cylindrical winding 3 made of a mold resin is wound around and fixed to the outer periphery of the substantially central portion of the two legs 2a of the iron core 2 in the vertical direction.

  Further, the upper yoke portion 2b of the iron core 2 is formed with a laminated surface on both end surfaces in the left-right direction of FIG. 1A, one laminated surface 2b1 on the left side of the paper, and the other laminated surface 2b2 on the right side of the paper. Has been. Similarly, in the lower yoke portion 2c of the iron core 2, a laminated surface is formed on both end surfaces in the left-right direction of the paper, one laminated surface 2c1 is formed on the left side of the paper, and the other laminated surface 2c2 is formed on the right side of the paper. These laminated surfaces 2b1 and 2b2 are provided with an upper core fastening 4a, and the laminated surfaces 2c1 and 2c2 are provided with a lower core fastening 4b. The upper core clamp 4a and the lower core clamp 4b are formed of a U-shaped metal fitting, and the longitudinal direction extends in the left-right direction in FIG. 1B, and the upper yoke portion 2b and lower yoke of the iron core 2 It is provided so as to cover the entire laminated surface of the part 2c.

  Coil bases 5 are respectively provided between the winding 3 and the upper core fastening 4a and between the winding 3 and the lower core fastening 4b. The coil base 5 is formed in a cylindrical or prismatic shape of an insulating material such as a veneer or a press board.

  The upper core fastening 4a and the lower core fastening 4b are connected to each other by an upper and lower connection fitting 8 that is rod-shaped and is threaded at both ends. The upper end of the upper and lower connecting fitting 8 is inserted through the upper core fastening 4a and coupled by a nut, and the lower end of the upper and lower connecting fitting 8 is inserted through the lower core fastening 4b and joined by a nut. By tightening the nuts at both ends of the upper and lower connecting brackets 8, a pulling force is applied between the upper core tightening 4 a and the lower core tightening 4 b, and the coil base 5 is also subjected to a compressing force in the vertical direction. The wire 3 is fixed to the center of the leg 2a of the iron core 2.

  The anti-vibration rubber 10 is bonded to the lower end of the lower core fastening 4b. The anti-vibration rubber 10 is provided to reduce vibration such as excitation vibration of the mold transformer 1 itself transmitted to the installation surface. Further, a base 11 is bonded to the lower end of the vibration-proof rubber 10, and the molded transformer 1 is fixed to the installation surface by driving an anchor bolt (not shown) between the base 11 and the installation surface.

  Here, the features of the present invention will be described.

  The upper core clamp 4a is further configured by a first upper core clamp 4a1 and a second upper core clamp 4a2, and the first upper core is formed on one laminated surface 2b1 of the upper yoke portion 2b shown in FIG. The fastening 4a1 is arranged on the other laminated surface 2b2, and the second upper core fastening 4a2 is arranged.

Further, between the first upper core clamp 4a1 and the second upper core clamp 4a2, an upper connecting member 9a of all screws is provided, and both ends are gripped by nuts 9a1. By tightening the nut 9a1, an attractive force acts between the first upper core fastening 4a1 and the second upper core fastening 4a2, and the upper yoke portion 2b of the iron core 2 is gripped.

Further, there is a gap between the first upper core clamp 4a1 and one laminated surface 2b1 of the upper yoke portion 2b and between the second upper core clamp 4a2 and the other laminated surface 2b2 of the upper yoke portion 2b. A flat-shaped eyelash member 7 made of a high-strength resin is disposed. With such a configuration, even if the mold transformer 1 sways in the left-right direction of the paper surface of FIG. 1B due to an earthquake, the upper core fastening 4a and the upper yoke portion 2b of the iron core 2 are Will not slip.

  Similarly, the lower core clamp 4b includes a first lower core clamp 4b1 and a second lower core clamp 4b2, and the first lower core is formed on one laminated surface 2c1 of the lower yoke portion 2c shown in FIG. The fastening 4b1 is arranged on the other laminated surface 2c2, and the second lower core fastening 4b2 is arranged.

Further, a lower connecting member 9b of all screws is provided between the first lower core fastening 4b1 and the second lower core fastening 4b2, and both ends are gripped by nuts 9b1. By tightening the nut 9b1, an attractive force acts between the first lower core fastening 4b1 and the second lower core fastening 4b2, and the lower yoke portion 2c of the iron core 2 is gripped.

  Further, there is a slip between the first lower core fastening 4b1 and one laminated surface 2c1 of the lower yoke portion 2c and between the second lower core fastening 4b2 and the other laminated surface 2c2 of the lower yoke portion 2c. A stainless steel plate is disposed as the member 6.

With the above-described configuration, when the mold transformer 1 is shaken in the left-right direction on the paper surface of FIG. 1B due to an earthquake, the lower yoke portion 2c is also moved left and right while sliding the lower core fastening 4b by the sliding member 6. Shake in the direction. That is, when the fulcrum of the swing is not the lower yoke portion 2c but the central portion of the iron core 2, the swing of the molded transformer 1 can be suppressed as a whole.

  If the slip coefficient of the sliding member 6 is too small, the lower yoke portion 2c is greatly swayed conversely if it is swayed in the left-right direction due to an earthquake. That is, the fulcrum of the swing is on the upper yoke 2b side of the iron core 2. In order to prevent this, for example, by increasing the tightening torque value of the nuts 9b1 at both ends of the lower connecting member 9b, or by increasing the glazing coefficient of the sliding member 6 (for example, making the surface uneven) It can be adjusted so that it is in the center of the height of the iron core 2 to suppress shaking.

  In this embodiment, a stainless steel plate is used as the sliding member 6. However, a smooth bake plate or iron plate with less surface irregularities may be used.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the thing with the same structure as what was demonstrated in 1st Embodiment gives the same number, and omits detailed description.

  In the second embodiment, between the first lower core fastening 4b1 and one laminated surface 2c1 of the lower yoke portion 2c and between the second lower core fastening 4b2 and the other laminated surface 2c2 of the lower yoke portion 2c. The rubber 13 which is an elastic body is interposed between them. Specifically, both ends of a plurality of prismatic rubbers 13 are bonded between the first lower core fastening 4b1 and one laminated surface 2c1 of the lower yoke portion 2c. Similarly, both ends of a plurality of prismatic rubbers 13 are bonded between the second lower core fastening 4b2 and the other laminated surface 2c2 of the lower yoke portion 2c.

With the configuration as described above, when the mold transformer 1 sways in the left-right direction on the paper surface of FIG. 2B due to an earthquake, the lower yoke portion 2c is made of the lower core fastening 4b by the rubber 13 which is an elastic body. Swings left and right without synchronizing with shaking. That is, when the fulcrum of the swing is not the lower yoke portion 2c but the central portion of the iron core 2, the swing of the molded transformer 1 can be suppressed as a whole.

If the width direction of the elastic rubber 13 is the left-right direction in FIG. 2A, the greater the width of the rubber 13 or the lower the hardness of the rubber 13, the more the fulcrum of shaking. It becomes the upper yoke 2b side of the iron core 2. In order to prevent this, for example, by increasing the tightening torque value of the nuts 9b1 at both ends of the lower connecting member 9b, reducing the width of the rubber 13, or increasing the hardness of the rubber, It can be adjusted so that it becomes the center of the height, and the shaking can be suppressed.

Claims (7)

In a transformer constituted by an iron core, a winding, and an upper core fastening and a lower core fastening provided respectively on the upper and lower portions of the iron core,
A transformer in which a slip member is provided between a lower part of the iron core and a lower core. The iron core is a substantially rectangular wound iron core made of a laminate of thin plates,
A leg part, an upper yoke part connecting the upper ends of the leg parts, and a lower yoke part connecting the lower ends of the leg parts,
The transformer according to claim 1, wherein a lower core clamp is in contact with each laminated surface of the lower yoke portion via the sliding member.   The transformer according to claim 1, wherein the sliding member is a bake plate, an iron plate, or a stainless plate.   The transformer according to any one of claims 1 to 3, wherein a glazing member is provided between an upper portion of the iron core and upper core fastening. In a transformer constituted by an iron core, a winding, and an upper core fastening and a lower core fastening provided respectively on the upper and lower portions of the iron core,
A transformer in which an elastic body is interposed between a lower portion of the iron core and a lower core fastening.   The transformer according to claim 5, wherein the elastic body is made of rubber and is interposed between each laminated surface of the lower yoke portion of the iron core and the lower core fastening.   The transformer according to claim 5, wherein a glazing member is provided between an upper portion of the iron core and upper core fastening.

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