JP7344843B2 - mold transformer - Google Patents

Description

The present invention relates to a molded transformer, and in particular to the structure of a steady rest fitting for a molded transformer.

One type of transformer is a molded transformer, in which the coil of the transformer body is molded with resin. When a molded transformer is housed in a box-shaped panel (such as a switchboard), a vibration isolator (steady rest structure) is provided to prevent the vibrations of the transformer from being transmitted to the panel.

As an example of a vibration isolating device that prevents the vibration of the transformer from being transmitted to the panel side, Patent Document 1 states, ``As a vibration isolating device, a steady rest metal fitting is provided on the transformer body, and a steady rest seat is provided on the outer plate of the panel side. A bolt is fixed to the steady rest metal fitting, a round hole is provided in the steady rest seat, and the bolt is passed through the round hole, so that the bolt and the round hole of the steady rest seat do not come into contact with each other under normal conditions. ” (see summary).

Japanese Patent Application Publication No. 2008-103578

When installing a transformer, a hanging device such as a wire is hung on hanging ears provided on the top of the transformer, and the transformer is lifted by the wire and moved and installed.

As seen in Patent Document 1, conventionally, the steady rest fitting of a vibration isolator is provided with a hole for bolt attachment, but this steady rest fitting may be mistakenly used as a hanging ear. If a transformer is lifted by hanging a wire around the steady rest metal fitting and the steady rest metal fitting is not strong enough, there are many cases where the steady rest metal fitting is damaged due to the weight of the transformer.

The present invention solves this problem and provides a molded transformer that allows the operator to recognize at a glance that the hole in the steady rest metal fitting is not a hanging ear, and that can reliably prevent damage to the steady rest metal fitting. purpose.

In order to solve the above problem, in the present invention, a slit is provided above the bolt fixing hole of the steady rest fitting.

An example of the molded transformer of the present invention is as follows:
A molded transformer in which a transformer body consisting of an annular core forming a magnetic path and a coil wound around the annular core and molded with resin is housed in a board,
A vibration isolating device is provided on the upper fastener attached to the transformer main body,
The vibration isolator includes a bolt attached to a hole in a steady rest provided in the upper fastener, and a bolt passed through a hole in a steady rest on the panel side, or a bolt attached to the steady rest on the panel side. is passed through a hole in a steady rest provided in the upper fastener, thereby suppressing relative displacement between the transformer main body and the board;
The device is characterized in that an upward slit that is open at the top is provided above the hole of the steady rest metal fitting.

According to the present invention, an operator can recognize at a glance that the hole in the steady rest fitting of a molded transformer is not a hanging ear, and damage to the steady rest fitting can be reliably prevented.

Problems, configurations, and effects other than those described above will be made clear by the following description of the embodiments.

FIG. 2 is an enlarged view of the upper part of the transformer according to Embodiment 1 of the present invention. FIG. 3 is an enlarged view of the upper part of the transformer according to Embodiment 2 of the present invention. The overall configuration diagram of a conventional molded transformer. A partially enlarged top view of the steady rest structure of a conventional molded transformer. A partially enlarged side view of the steady rest structure of a conventional molded transformer. A partially enlarged view of a conventional steady rest fitting seen from the front.

Embodiments of the present invention will be described below with reference to the drawings. In each figure for explaining the embodiments, the same components are given the same names and symbols as much as possible, and repeated explanations thereof will be omitted.

Prior to describing embodiments of the present invention, a molded transformer described in Patent Document 1 will be described. Figure 3 (a) shows a front view of the overall configuration of a box-contained transformer, and Figure 3 (b) shows its top view, in which the main body of a three-phase molded transformer is housed in a rectangular board. .

In FIG. 3(a), the transformer body and the panel are fixed to a common base embedded in concrete or the like using bolts or the like.

In Fig. 3, 1 is a molded part where the coil is covered with resin, 2 is a tap switching part, 3 is an upper fastener, 4 is a lower fastener, 5 is a primary terminal, 6 is a secondary terminal, and 7 is connected to the ground. It is a vibration isolator. In the transformer, the molded transformer main body is fixed with an upper fastener 3 and a lower fastener 4. 8 is a rectangular panel, and 9 is a vibration isolator for the panel side, which is provided at two locations on the left and right when viewed from the front of the transformer. During operation of the transformer, the transformer vibrates due to the magnetostriction of the iron core, and the vibration frequency due to this magnetostriction is twice the commercial frequency. A vibration isolator 9 is provided to prevent vibrations of these frequencies from being transmitted to the board side.

4 and 5 are partially enlarged views showing the seismic steady rest structure (vibration isolator) of FIG. 3. FIG. 4 is a partially enlarged view of the steady rest structure seen from the top, and FIG. 5 is a partially enlarged view of the steady rest structure seen from the side.

4 and 5, 10 is a steady rest fitting provided on the upper fastener 3, 11 is a steady rest bolt attached to the steady rest fitting, 12 is a steady rest seat which corresponds to the outer plate on the board side, and 13 is a bolt. Nut 14 attached to is a round hole through which bolt 11 provided on the steady rest seat is passed.

In FIGS. 4 and 5, the steady rest part of the molded transformer main body is composed of a steady rest metal fitting 10 and a steady rest bolt 11. A steady rest bolt 11 is attached to a steady rest metal fitting 10, tightened with a nut, and fixed in a state protruding outside the width of the transformer. The steady rest bolt 11 protruding outward passes through a round hole 14 provided in the steady rest seat 12 on the board side, and in a normal state, it blocks the transmission of vibration without directly contacting the steady rest bolt 11. In the event of an earthquake, the steady rest bolt 11 stops in the round hole 14 and acts as a stopper to suppress vibration. In addition, by fixing a nut 13 to the tip of the steady rest bolt 11 that has passed through it, with a space provided so that it does not come into direct contact with the steady rest seat 12 on the panel side, a structure that has earthquake resistance in three axial directions can be obtained. . With such a configuration, vibrations due to magnetostriction of the iron core are difficult to be transmitted to the board side, and the influence on the board side can be eliminated.

FIG. 6 shows a front view of the steady rest fitting 10 at the top of a conventional transformer. A steady rest fitting 10 provided on the upper part of the upper fastener 3 is provided with a plurality of (three in the figure) holes 15.

When installing a transformer, a hanging device such as a wire is hung on hanging ears provided on the top of the transformer, and the transformer is lifted by the wire and moved and installed.

As shown in FIG. 6, conventionally, the steady rest fitting 10 of the vibration isolator is provided with holes 15 for bolt attachment, but there is a risk that the steady rest fitting 10 may be mistakenly used as a hanging ear. If a wire is hung around the steady rest fitting 10 and the transformer is lifted up, and the steady rest fitting 10 is not strong enough, the steady rest fitting 10 will be damaged by the weight of the transformer.

The present invention solves this problem, allows the operator to recognize at a glance that the hole in the steady rest fitting 10 is not a hanging ear, and reliably prevents damage to the steady rest fitting.

FIG. 1 shows a partially enlarged view of the upper part of a molded transformer according to Embodiment 1 of the present invention. FIG. 1(a) is a partially enlarged side view of the steady rest structure when the vibration isolator 9 in the front view of FIG. 3(a) is viewed from the front, and FIG. ) is a front view of the vibration isolator 9 seen from the left side, and a partially enlarged view of the steady rest fitting seen from the front.

An annular core 100 forming a magnetic path is attached with a molded part 1 in which a coil wound around the annular core is covered with resin, and an upper fastener 3 is attached to the upper part of the annular core 100. The upper fastener 3 is equipped with a vibration isolator 9 for suppressing relative displacement with the panel. A steady rest fitting 10 constituting a vibration isolator is attached to the upper fastener 3, and the steady rest fitting 10 has U-shaped elongated holes 20a, 20b, 20c open at the top for attaching bolts. are arranged vertically. It can be said that the U-shaped elongated hole has a slit in the upper direction having the same width as the diameter of the hole.

As shown in Fig. 1(a), when storing the molded transformer main body in a panel, insert bolts into the elongated holes 20a, 20b, 20c of the steady rest fitting 10 and secure them with nuts. Insert the steady rest bolt 11 into the round hole 14 provided in 12. In a normal state, the steady rest bolt 11 and the steady rest seat 12 do not come into direct contact with each other to cut off transmission of vibrations. In the event of an earthquake, the steady rest bolt 11 stops in the round hole 14 of the steady rest seat 12, and acts as a stopper to suppress vibration.

In this embodiment, a vertical U-shaped elongated hole with an open top, that is, a hole with a slit in the top, is formed at the location where the steady rest bolt 11 is attached to the steady rest fitting 10 of the vibration isolator 9. Therefore, the operator can recognize at a glance that the hole in the steady rest of the molded transformer is not a hanging ear.

In addition, as a modification, the steady rest bolt 11 may be attached to the steady rest seat 12, and the bolt may be inserted into a U-shaped elongated hole formed in the steady rest fitting 10.

According to this embodiment, by providing a slit at the top of the hole in the steady rest metal fitting, the operator can visually recognize at a glance that the hole in the steady rest metal fitting is not a hanging ear, and it is also possible to physically prevent wires, etc. The structure is such that it is impossible to hang a hanging device, and damage to the steady rest fittings can be reliably prevented.

FIG. 2 shows a partially enlarged view of the upper part of a molded transformer according to a second embodiment of the present invention. FIG. 2(a) is a partially enlarged side view of the steady rest structure when the vibration isolator 9 in the front view of FIG. 3(a) is viewed from the front, and FIG. ) is a front view of the vibration isolator 9 seen from the left side, and a partially enlarged view of the steady rest fitting seen from the front.

In Example 1, a slit with the same width as the hole was provided and the upper parts of the elongated holes 20a, 20b, and 20c were all opened, but in this case, there is a risk that the attached steady rest bolt 11 may come off from the upper part of the elongated hole. . In the second embodiment, the width of the slit is set to an arbitrary value.

As shown in FIG. 2, slits with a width narrower than the diameter of the steady rest bolt 11 are provided above the long holes 21a, 21b, and 21c for bolt attachment of the steady rest fitting 10. This prevents the bolt 11 from coming off the top of the elongated hole, and allows the operator to recognize at a glance that it is not a hanging ear.

The hole provided in the steady rest fitting 10 may be a round hole, an elongated hole in the horizontal direction, or an elongated hole in the vertical direction, but an elongated hole in the vertical direction is more preferable.

According to this embodiment, a slit with a width narrower than the diameter of the steady rest bolt is provided at the upper part of the hole in the steady rest metal fitting that constitutes the vibration isolator, so that the hole in the steady rest metal fitting can be visually suspended at a glance. The worker is made to recognize that it is not an ear, and since it is impossible to physically attach a hanging device such as a wire, it cannot be used as a hanging ear, and damage to the steady rest metal fitting can be reliably prevented. It is also possible to prevent the steady rest bolt from coming off from the upper part of the hole.

In the above two embodiments, the structure of the steady rest fitting 10 includes three elongated holes for attaching steady rest bolts, but the present invention can be applied regardless of the number of holes and the shape of the holes. can.

1...Coil mold body 2...Tap switching part 3...Upper fastener 4...Lower fastener 5...Primary terminal 6...Secondary terminal 7...Lower vibration isolator 8...Panel 9...Vibration isolator 10...steady rest fitting 11... Steady rest bolt 12... Steady rest seat 13... Nut 14... Round hole of steady rest seat 20... U-shaped elongated hole 21... Elongated hole with slit 100... Annular core

Claims (5)

A molded transformer in which a transformer body consisting of an annular core forming a magnetic path and a coil wound around the annular core and molded with resin is housed in a board,
A vibration isolating device is provided on the upper fastener attached to the transformer main body,
The vibration isolator is
Attach a bolt to the hole of the steady rest provided in the upper fastener, and pass the bolt through the hole of the steady rest on the panel side, or
By passing the bolt attached to the steady rest on the panel side through the hole of the steady rest provided in the upper fastener,
suppressing relative displacement between the transformer main body and the panel;
A molded transformer characterized in that an upward slit that is open at the top is provided above the hole of the steady rest metal fitting. The molded transformer according to claim 1,
A molded transformer characterized in that a substantially U-shaped elongated hole is provided by making the width of the slit the same as the diameter of the hole of the steady rest fitting. The molded transformer according to claim 1,
A molded transformer characterized in that the width of the slit is narrower than the diameter of the hole of the steady rest fitting. The molded transformer according to claim 3,
A molded transformer characterized in that the width of the slit is narrower than the diameter of the bolt. The molded transformer according to claim 1,
A molded transformer, wherein the steady rest metal fitting is provided with a plurality of the holes.

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