JP7285246B2 - transformer - Google Patents

Description

The present invention relates to transformer installations or transformers.

Distribution transformers, such as pole-mounted transformers that supply power by changing the voltage on distribution lines, or power transformers, which are relatively small transformers for power reception installed in individual factories, are mainly composed of an iron core. and a winding wound around an iron core, and a container for housing the transformer body, that is, an outer box.

Conventionally, the main body of the transformer has been fixed by a fixing device having a specified size structure installed inside the outer case. When these fixing devices are made by different manufacturers, or even if they are made by the same manufacturer, if the capacity of the transformer and the year of manufacture are different, the installation position of the iron core and windings inside the outer case will be slightly different. Due to the lack of uniformity, repairs such as replacing the outer box were often time-consuming or difficult.

Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2006-196759) describes a power transformer equipped with an adjustable fixing mechanism 2 that fixes a core P part made up of internal parts such as an iron core and a coil winding of a power transformer. The general-purpose replacement outer box 1, the adjustable fixing mechanism 2 is provided with a pair of laterally slidable clamping pieces 13, and a base 3 for anti-vibration on which the core part P is placed and fixed, and the core It is formed by an upper anti-vibration seat 4 having a plurality of screw holes 4A arranged in a vertical direction so that the upper part of the part P is screwed and fixed to the inner wall via a spacer 7 of a predetermined length. (see abstract).

Patent Document 2 (Japanese Patent Application Laid-Open No. 2020-188093) describes that "a transformer has an assembly having an iron core and a winding wound around the iron core, and a tank 10 that houses the assembly. It has a top fastener 30 attached to the top of the tank 10 and a content mounting seat 40 provided on the inner wall of the tank 10 and serving as a connection portion with the top fastener 30. Mounting portion 31 of the top fastener 30 Alternatively, the fixing groove 32 provided on one side of the content mounting seat 40 of the tank 10 is fitted to the mounting portion 31 of the upper fastener 30 or the convex portion provided on the other side of the content mounting seat 40 of the tank 10, so that the voltage is reduced. The container contents are secured to the tank 10." (see abstract).

JP 2006-196759 A JP 2020-188093 A

In the power transformer described above, if the main body parts such as the iron core and windings are hardly deteriorated, but the outer case is significantly rusted, only the outer case is replaced and the transformer main body is used as it is. By performing a so-called outer box replacement repair, it is possible to reduce the cost of the equipment compared to the case where all parts of the transformer are manufactured with new parts.

According to Patent Document 1, when performing an outer box replacement repair for a plurality of transformers having the same apparent power determined by the specifications of the transformer main body, that is, the capacity, but different specifications of the transformer main body and the outer box, By using an adjustable fixing mechanism for the fixing portion between the container body and the outer box, it is possible to use one general-purpose replacement outer box. However, in Patent Document 1, additional parts such as holding pieces, spacers, and additional wires are used as the adjustable fixing mechanism. The influence of , the influence on the reliability of the entire device, and the compatibility of the outer box at the time of manufacturing a new product and the outer box for general-purpose replacement are not taken into consideration.

According to Patent Document 2, by fixing the main body of the transformer using the fixing groove provided in the mounting portion of the upper clamp, fixing bolts are not used and the number of parts for fixing the main body of the transformer is reduced. , the fixing structure of the transformer body can be simplified. In addition, it is possible to simplify the work of fixing the transformer main body to the container, and it is possible to improve productivity by reducing the assembly work process. However, in Patent Document 2, compatibility is ensured by using a single general-purpose replacement outer box to replace and repair multiple transformers with the same transformer capacity but different transformer main body and outer box specifications. has not been considered.

INDUSTRIAL APPLICABILITY The present invention makes it possible to replace a plurality of transformers with the same capacity but with different specifications of the main body and the outer box, while suppressing an increase in the number of parts, and replacing them with a single general-purpose replacement outer box. for the purpose.

A preferred example of the transformer of the present invention is a transformer having a transformer main body having an iron core and windings wound around the iron core, and an outer case housing the transformer main body, wherein the transformer main body is An upper fixing metal fitting attached to the outer box mounted above, a mounting seat provided on the inner wall of the outer box and connecting to the upper fixing metal fitting, and an outer metal fitting attached to the lower part of the main body of the transformer. A lower fixing bracket to the box, and a vibration rest provided on the inner bottom of the outer box, which is a connection portion with the lower fixing bracket, and the upper fixing bracket is connected to the bolt hole provided in the mounting seat. It has an elongated hole-shaped fixing groove that can adjust the bolt fastening position, and the lower fixing bracket has a multi-stage anti-vibration fixing groove that can adjust the position where it fits with the anti-vibration provided on the inner bottom of the outer box. characterized by having

As another feature of the present invention, in the transformer described above, the upper fixing bracket has a fixing groove that fits with a cylindrical protrusion provided on the mounting seat, and the fixing groove is formed by the above-described It is a groove in the circumferential direction of the outer case, and the protrusion is fitted into the fixed groove by rotating the transformer body.

As still another feature of the present invention, in the transformer, the suspended transformer main body is inserted into the outer box and rotated to rotate the transformer main body so that the mounting seat is provided with a It is characterized in that fitting the cylindrical projection into the fixing groove of the upper fixing metal fitting and fitting the anti-vibration fixing groove of the lower fixing metal fitting to the anti-vibration fixing groove of the lower fixing metal fitting are performed at the same time. and

According to the present invention, when a plurality of transformers with the same capacity but different specifications of the transformer main body and the outer box are to be replaced and repaired, one general-purpose replacement outer box can be used while suppressing an increase in the number of parts. It is possible to respond to

1 is a schematic diagram of a main body of a transformer targeted by the present invention; FIG. FIG. 2 is a schematic diagram of a fixing structure between an outer case and a transformer main body in a conventional transformer; 4 is a top view of a schematic diagram of the lower fastener in Example 1. FIG. 4 is a schematic view of the positional relationship between the bottom clamp and the main body vibration rest immediately after inserting the transformer main body to which the bottom clamp is fixed in the first embodiment into the outer case; FIG. FIG. 4 is a schematic view of the positional relationship between the bottom clamp and the main body anti-vibration after fixing the transformer main body to which the bottom clamp is fixed in the first embodiment to the outer case; FIG. 2 is a projection view of two main body fixing brackets, left and right, according to the first embodiment; FIG. 4 is a schematic diagram of a fixing structure of a transformer main body to which a left main body fixing metal fitting 41 and a right main main body fixing metal fitting 42 in Embodiment 1 are applied; FIG. 10 is a schematic view of the inside of the transformer in which the main body of the transformer is fixed to the main body mounting seat 27 of the outer case 10 using the main body fixing metal fittings 43 and 44 in Embodiment 2; FIG. 10 is a plan view, a front view, a plan view, a front view, and a right side view of a right main body fixing metal fitting 44 in Embodiment 2. FIG. FIG. 8 is a schematic diagram of a fixing structure of a transformer main body to which a left main body fixing metal fitting 43 and a right main main body fixing metal fitting 44 in Embodiment 2 are applied; Fig. 10 is a schematic diagram showing a state in which the lifted transformer body in Example 2 is inserted into the outer box 10 and lowered to a target position just before the transformer body lands on the bottom of the box; After completing the relative rotation 51 between the transformer main body and the outer case 10 in the second embodiment, the pair of main body mounting seats 27 of the outer case 10 are fixed to the left main body fixing bracket 43 and the right main body fixing bracket 44 for fixing the main body. It is a schematic diagram showing a state in which the groove 90 is fitted to the deepest position in the horizontal direction.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing for describing the embodiments, the same component is given the same name and reference numeral as much as possible, and the repeated description thereof is omitted.
Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

FIG. 1 shows a schematic diagram of a transformer targeted by the present invention. As shown in FIG. 1, the transformer to which the present invention is directed has a container consisting of an outer case 10 and a cover 11. Inside the container is a transformer comprising an iron core 12 and a winding 13 wound around the iron core 12. The container body 14 is accommodated. In addition, it is desirable that the container be hermetically sealed. Moreover, the case where the outer case 10 and the cover 11 are integrated may also be called an outer case. Further, the transformers in the embodiments shown below are oil-filled transformers having insulating oil, which is a liquid for insulating and cooling the transformer main body 14, in the outer box, or varnish, which is a resin, in the outer box. A dry-type transformer coated on the main body 14 will be described as a representative. Not limited to these, other transformers may be used.

FIG. 1 shows, as an example of a transformer to which the present invention is directed, a core-type transformer in which there is one iron core, which is a magnetic circuit, and a winding is wound around the iron core. The present invention is similarly applicable to a shell type in which two or more iron cores surround a winding. Moreover, the present invention can be applied not only to a single-phase transformer for single-phase alternating current, but also to a three-phase transformer for three-phase alternating current.

FIG. 2 shows a schematic diagram of a fixing structure between an outer casing and a transformer main body in a conventional transformer. In FIG. 2, the main components in the outer box, excluding the transformer body, are the top fasteners 20 arranged above the transformer body and the bottom fasteners 21 arranged below the transformer body. , a main body fixing metal fitting 22 arranged above the transformer main body in the same manner as the upper metal fitting 20 for fixing the main body of the transformer and the outer case, and a metal fitting fixing bolt for fixing the upper metal fitting 20 and the main body fixing metal fitting 22. There are five types of bolts 24 for fixing a nut 23, a main body fixing bracket 22, and a main body mounting seat 25 provided with one bolt hole in the inner wall of the outer box.

The main body fixing bracket 22 is a plate member bent in a U shape, and the mounting portions at both ends thereof are positioned on the main body mounting seats 25 provided at two locations facing the substantially central portion of the inner wall of the outer casing 10 . It is fastened with a main body fixing bolt 24 , and is fastened with an upper fastener 20 and a metal fitting fixing bolt/nut 23 .

The upper fastener 20 and the lower fastener 21 are respectively fixed to the upper and lower parts of the transformer main body 14 when the transformer is manufactured. The method of fixing the top fastener 20 and the bottom fastener 21 is, for example, although not shown, a tightening band is used to pass through holes drilled in both metal fittings, the outer periphery of the core, the upper surface of the top fastener, and the bottom. The bottom surface of the fastener is looped around and both ends are tied and fixed.

The main body steady rests 26 are a pair of protrusions provided on the bottom surface of the outer box, and are fitted into a pair of holes or grooves provided in the lower part of the lower fastener 21, thereby suppressing the voltage change inside the outer box. It suppresses the movement of the main body of the transformer and plays an auxiliary role in fixing the main body of the transformer.

The upper fastener 20, the lower fastener 21, and the main body fixing metal fitting 22 are collectively referred to as metal fittings, and the metal fixing bolts/nuts 23 and main body fixing bolts 24 are collectively referred to as fixing bolts or simply bolts. Also, the main body vibration rest 26 is simply referred to as a vibration rest.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 12. FIG.

FIG. 3 shows a top view of a schematic diagram of the bottom bracket in Example 1, and FIG. 4 shows the bottom bracket and main body immediately after inserting the transformer body to which the bottom bracket is fixed in Example 1 into the outer case. A schematic diagram of the positional relationship with the steady rest is shown, and the transformer main body to which the lower fasteners in Example 1 are fixed is fixed to the outer case (rotating the transformer main body so that it fits in the vertical groove of the lower fasteners). Fig. 10 shows a schematic diagram of the positional relationship between the lower fastener and the main body vibration rest after fitting the main body vibration rest.

As shown in FIG. 3, the lower fasteners in the first embodiment can be used universally for any spacing in response to variations in the spacing between the pair of main body vibration rests 26 due to differences in the specifications of the outer box. The groove part fitted to the pair of main body vibration rests 26 has a plurality of main body vibration rest fixing grooves 30 arranged in a multi-step shape in the diametrical direction of the outer casing 10 so that the main body vibration rests 26 can be used for this purpose. In addition, the main body anti-vibration fixing groove 30 is called an anti-vibration fixing groove at the end.

As shown in Figures 4 and 5, even if the installation position of the vibration restraint of the outer box at the time of production and the vibration restraint of the general-purpose exchange outer box are different, the vibration restraint will move to the inside of the vibration restraint fixing groove. It is possible for the stop to be mated. The vibration rest fixing groove is not limited to a continuous groove shape as shown in FIG. 3, and may have a shape in which a plurality of single holes are provided.

FIG. 6 shows a projection view of the main body fixing metal fittings divided into left and right parts in the first embodiment, and FIG. shows a schematic diagram of

6(a) and 6(b) show a plan view and a front view of the left main body fixing bracket 41. FIG. 6(c), 6(d), and 6(e) show a plan view, a front view, and a right side view of the right main body fixing bracket 42. FIG.

As shown in FIG. 7, the left main body fixing metal fitting 41 and the right main body fixing metal fitting 42 in the first embodiment are long hole-shaped main bodies that can adjust the bolt fastening position with the top fastener 20 according to the inner diameter of the outer casing 10. It has a fixing metal fitting fixing groove 60 and an elongated main body fixing groove 61 whose bolt fastening position can be adjusted according to the mounting height of the main body mounting seat 25 provided on the inner wall of the outer box.

During the production of the transformer or when replacing or repairing the outer box for general-purpose replacement, the left main body fixing metal fitting 41 and the right main body fixing metal fitting 42 are attached to the top metal fitting 20 fixed to the main body of the transformer by the metal fitting fixing bolts. - Temporarily fasten with the nut 23 and insert the suspended transformer main body into the outer case 10 to the position shown in FIG. After that, the transformer main body and the outer casing 10 are rotated 50 relative to each other to the position shown in FIG. After that, as shown in FIG. 7, the left main body fixing metal fitting 41 and the right main body fixing metal fitting 42 are fastened with metal fitting fixing bolts/nuts 23 and main body fixing bolts 24 to fix the main body of the transformer to the outer casing 10. to complete.

FIG. 10 shows a modification of the main body fixing grooves 61 of the left main body fixing bracket 41 and the right main body fixing bracket 42 and the main body mounting seat 25 provided on the inner wall of the outer case 10 in the second embodiment.

9(a) and 9(b) show a plan view and a front view of the left main body fixing bracket 43. FIG. 9(c), 9(d) and 9(e) show a plan view, a front view and a right side view of the right main body fixing bracket 44. FIG.

As shown in FIGS. 8 and 10, the main body mounting seat 27 is formed of a cylindrical convex portion, and has a head portion with a large cross-sectional area at its tip.

The main body fixing groove 90 shown in FIG. 9(e) allows the main body mounting seat 27 to be fitted into the main body mounting seat 27 in order to cope with the change in mounting height between the main body mounting seat 27 and the main body mounting seat 27 caused by the different specifications of the transformer main body and the outer case. It is a groove for fixing the main body with multiple steps that get stuck. Each main body fixing groove 90 has an opening at the side end of the main body fixing metal fitting, extends horizontally from the opening, and is bent upward at the terminal end.

FIG. 8 shows a schematic view of the inside of the transformer in which the main body of the transformer is fixed to the main body mounting seat 27 of the outer case 10 using the main body fixing metal fittings 43 and 44 in the second embodiment.

FIG. 10 shows a fixing structure of the transformer main body to which the left main body fixing metal fitting 43 and the right main main body fixing metal fitting 44 in the second embodiment are applied, and the main body mounting seat 27 of the outer box 10 in the main body fixing groove 90 of the main body fixing metal fitting. Indicates a stuck state.

In FIG. 11, the transformer body lifted using the body lifting eyebolt 110 attached to the top fastener 20 is inserted into the outer box 10 and lowered to the target position just before the transformer body lands on the bottom of the box. (the bottom of the transformer body has not yet landed on the bottom of the box). At this time, the fitted positional relationship between the main body vibration rest fixing groove 30 of the lower clamp 21 of the transformer main body and the pair of main body vibration rests 26 corresponds as shown in FIG.

The transformer main body and the outer casing 10 are rotated 51 relative to each other while the transformer main body is lowered and suspended to the state shown in FIG. With the relative rotation 51 between the transformer main body and the outer case 10, the horizontal direction of the groove 90 from the opening of the main body fixing metal fitting 43 and the right main body fixing metal fitting 44 attached to the top fastener 20. Then, the body mounting seat 27 mounted on the inner wall of the outer box 10 is fitted.

12, after the relative rotation 51 between the transformer main body and the outer case 10, the pair of main body mounting seats 27 of the outer case 10 are fixed to the left main body fixing metal fitting 43 and the right main main fixing metal fitting 44. It shows a state in which the groove 90 is fitted to the deepest position in the horizontal direction. At this time, the fit between the main body vibration rest fixing groove 30 of the lower clamp 21 of the transformer main body and the pair of main body vibration rests 26 has reached the state shown in FIG. Rotation 50 and rotation 51 are performed simultaneously.

After that, the suspended state of the transformer main body is released, and the bottom of the transformer main body (which becomes the bottom of the lower fastener 21) lands on the bottom of the box to complete the fixing of the transformer main body and the outer case 10.例文帳に追加Here, as the transformer main body is slightly lowered and landed, the pair of main body mounting seats 27 of the outer box 10 are pushed into the main body fixing grooves 90 of the left main body fixing bracket 43 and the right main body fixing bracket 44. It fits into a groove bent upward at its horizontal end.

According to the second embodiment, the pair of main body mounting seats 27 of the outer box 10 are attached to the main body fixing grooves 90 of the left main body fixing bracket 43 and the right main body fixing bracket 44 attached to the upper fastener 20, and the transformer main body. The main body of the transformer and the outer case 10 are connected without using fixing bolts or the like by fitting them together by rotating and suspending relative to the outer case 10.例文帳に追加Moreover, the fitting between the main body vibration rest fixing groove 30 of the lower clamping member 21 of the transformer main body and the pair of main body vibration rests 26 is performed simultaneously by the same rotational operation. As described above, the work of aligning the main body fixing metal fittings and the main body mounting seats and tightening the bolts becomes unnecessary, the work of fixing the transformer main body and the outer case 10 is simplified, and productivity is improved by reducing the assembly work process. can be done.

10 Outer case 11 Cover 12 Iron core 13 Winding 14 Transformer main body 20 Upper fastener 21 Lower fastener 22 Main body fixing metal 23 Metal fixing bolts and nuts 24 Main body fixing bolt 25 Main body mounting seat 26 of conventional and first embodiment Main body vibration rest 27 Main body mounting seat 30 of Embodiment 2 Main body vibration rest fixing groove 41 of lower fastener in Embodiment 1 Left body fixing metal fitting 42 in Embodiment 1 Right main body fixing metal fitting 43 in Embodiment 1 Left side in Embodiment 2 Main body fixing bracket 44 Right main body fixing bracket 50 in the second embodiment Relative rotation 51 between the transformer main body and the outer case 10 in the assembly process of the first embodiment Transformer main body and the outer box 10 in the assembly process of the second embodiment Relative rotation 60 Fixing grooves 61 between the main body fixing bracket and the top fastener in Embodiments 1 and 2 Fixing grooves 90 between the main body fixing metal fitting and the outer case in the first embodiment Fixing the main body fixing metal fitting and the outer case in the second embodiment Groove 110 Body lifting eyebolt

Claims (10)

A transformer having a transformer body having an iron core and windings wound around the iron core, and an outer case housing the transformer body,
An upper fixing bracket attached to the upper part of the transformer main body and connected to the outer case;
a mounting seat that is provided on the inner wall of the outer box and is a connection portion with the upper fixing bracket;
a lower fixing bracket attached to the lower part of the main body of the transformer and connected to the outer case;
a vibration rest provided on the inner bottom of the outer box and being a connection portion with the lower fixing bracket,
The upper fixing bracket has a bolt hole provided in the mounting seat and an elongated fixing groove for adjusting a bolt fastening position,
A transformer according to claim 1, wherein said lower fixing bracket has a multistage anti-vibration fixing groove capable of adjusting a position where it fits with an anti-vibration provided on the inner bottom of said outer case. A transformer according to claim 1, wherein
A transformer according to claim 1, wherein said upper fixing bracket has a fixing groove that fits into a cylindrical projection provided on said mounting seat. A transformer according to claim 2, wherein
The fixing groove of the upper fixing bracket is a groove in the circumferential direction of the outer box,
A transformer as claimed in claim 1, wherein said protrusions are fitted into said fixing grooves by rotating said transformer body. A transformer according to claim 3, wherein
The transformer, wherein the fixing groove has an upwardly bent groove at a terminal end of the groove extending in the circumferential direction of the outer case. A transformer according to claim 3, wherein
A wide opening is provided at the entrance of the fixed groove,
A transformer, wherein the protrusion is fitted from the opening. A transformer according to claim 3, wherein
A transformer, wherein the upper fixing fitting has a plurality of stages of the fixing grooves in the height direction of the outer case. A transformer according to claim 2, wherein
A head with a large cross-sectional area is provided at the tip of the columnar protrusion provided on the mounting seat,
A transformer according to claim 1, wherein said fixing groove and said head are in contact with each other to restrict the position thereof. A transformer according to claim 1, wherein
The lower fixing bracket has a plurality of anti-vibration fixing grooves arranged in multiple stages in the diametrical direction of the outer case,
The anti-vibration fixing groove corresponding to the interval of the anti-vibration according to the specifications of the outer case is selected, and the anti-vibration fixing groove provided on the inner bottom of the outer case is fitted to the selected anti-vibration fixing groove. Characterized transformer. A transformer according to claim 3, wherein
Inserting the suspended transformer main body into the outer case and rotating the transformer main body to fit the cylindrical protrusion provided on the mounting seat into the fixing groove of the upper fixing bracket. and fitting the vibration-rest provided on the inner bottom of the outer case into the vibration-rest fixing groove of the lower fixing bracket at the same time. 10. A transformer according to claim 9,
After rotating the transformer main body, the suspended state of the transformer main body is released, and the bottom of the transformer main body is landed on the bottom of the box, so that the convex portion is located in the fixing groove of the upper fixing bracket. wherein the transformer main body is fixed to the outer case by fitting into an upwardly bent groove at the terminal end of the groove extending in the circumferential direction of the transformer.

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