JPS6032740Y2 - Bracket structure for transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transformer having a bracket around an iron core, and substantially relates to an improvement of the bracket structure.

Generally, in a transformer with an EI type core, three of the four sides forming the outline of the core are surrounded by brackets, and a bottom plate is attached to the remaining side to complete the product.

Furthermore, this type of bracket has a fixed shape regardless of the type of transformer, and has not received any attention for improvement.

However, in reality, the structure of this type of bracket is quite cumbersome, and the sheet material used to make the bracket is wasted.

In order to clarify this drawback, a conventional transformer bracket structure will be illustrated and explained in FIGS. 1 and 2.

The bracket 1 is constructed by forming a first side surface 3 along one side of the iron core 2 (imaginary line), an upper surface 4 along the top surface, and a second side surface 5 along the other side from a single metal sheet material as shown in FIG. As shown in the developed view, the punching is performed in a continuous state, and the folding lines L1. Fold at L2 to make a U-shape.

The width W of each surface part is approximately the same as the thickness of the iron core 2, but on both sides of each surface part there are front and rear holding pieces 3', 3';4',4': 5 ', 5' are provided, which are also initially press punched continuously flush with each surface 3, 4.5, and then in a developed view on both sides of each surface 3, 4.5 in the length direction. The bending lines L3' and L4' located at ?
It is made by bending at L5'.

Furthermore, if the ears 6 and 7 with mounting holes are required to attach the transformer to the chassis or other parts, these should also be bent at the bending line L6.
It is press punched in one piece so that it can be bent at L7, and also has claws 10 and 10 for fastening the bottom plate 9.
..., etc. are punched out in the same way.

Therefore, in the bracket 1 having such a conventional structure, for the sake of simplicity, without considering the material plate thickness, the surface portions 3. 4. A material with a width W+2ω is required, which is the sum of the width W required for 5 and the width 2ω required for each front and rear presser piece 3', 4', and 5'.

In this way, although a relatively large amount of material is required, as shown by the hatched area in FIG. 2, the presser pieces 3' are adjacent in the length direction.

4' and the triangular part 12 between 4' and 5'...
There are many materials that are wasted.

Furthermore, the portion 13 between the mounting ears 6, 7 and the bottom plate fastening claw 10, which extend in the same direction, becomes a considerable waste.

Moreover, as described above, as shown in the first diagram, the bracket 1
Because there are many components, there are many bending points in order to complete the product, so even if it were automated with a machine, it would not be desirable.

This proposal was basically made based on the above considerations, and it is possible to make the width of the material required for the bracket almost the same as the thickness of the iron core, minimize the amount of wasted material, and also facilitate assembly. It is an object of the present invention to provide a bracket structure that can minimize the number of times of bending.

The basic idea is that it is possible to omit the front and rear holding pieces 3', 4', and 5' of the transformer core used in the conventional bracket.

Conventionally, these presser pieces 3/, 4/. 5' was used because there was a preconceived notion that without it, the bracket would not be able to prevent the core from shifting, but the applicant conducted experiments with the above-mentioned focus on breaking this preconceived notion. As a result, they came to the conclusion that as long as the bracket could be firmly held in relation to the bottom plate, it would be sufficient to not need these holding pieces.

An embodiment of the proposed bracket structure based on this idea will be described in detail below.

The same reference numerals as in FIGS. 1 and 2 are used in the present embodiment for components corresponding to those in the conventional example.

The proposed bracket 1 also consists of a first side surface portion 3, an upper surface portion 4, and a second side surface portion 5 that are continuous in order to surround the three sides of the transformer core 2, but conversely speaking, these surface portions 3, 4. The presser pieces 3', 4', and 5' shown in FIGS. 1 and 2, which protrude with respective widths ω on both sides of each surface portion as in the conventional case, are not provided.

Therefore, as shown in FIG. 4A, which is a developed view of the bracket 1, the width of the metal sheet material required to punch out this bracket may be the same as the width W of each surface, and the width W of each surface is the same as the width W of each surface. The thickness should be approximately the same as the thickness T of 2.

Even if the ears 6.7 are provided continuously on the first and second side parts 3, 5 and have mounting holes for the chassis etc., the material portions 14 and 14 at the mounting holes will only be wasted. , there is no wasted material with respect to each of the main constituent surface portions 3, 4.5.

In this way, the material of the bracket 1 is saved, and the U-shaped main part is created by simply folding the lines L between each surface part.
1. It is sufficient to simply bend it at L2, and even if the mounting ears 6 and 7 are bent, it is sufficient to bend it at four locations in total.

In this way, the bracket 1, in which each surface portion 3.degree. 4.5 is simply attached to each surface portion of the iron core 2, is maintained fixed to the iron core by the bottom plate 9 as described below.

FIG. 4B shows a developed view of the bottom plate 9, which is also press punched from a metal sheet in this state.

First, there is a bottom part 15 that is attached to the bottom of the iron core 2.
On both sides, holding pieces 1 are raised at right angles by bending lines L15', L15', and 1' to press down the front and rear surfaces of the core.
5' and 15' are provided at both ends of this holding piece, and retaining claws 16 and 16 are provided at both ends of the holding piece to press down both side surfaces 3 and 5 of the bracket, respectively.
will be provided.

Therefore, the bottom plate 9 has a width larger than the width W of the bracket, and the provision of the retaining pawls 16 and 16 creates a portion 17°17 (phantom line in Fig. 4B) that results in some wasted material. Since the bracket 1, which is large in size and requires a large amount of material, can be expected to save a large amount of material as mentioned above, the effectiveness of the main project will not be impaired. In fact, it is even better when compared.

Assembly of the bracket and bottom plate is also extremely convenient.

First, place the brackets 1 which have been bent and formed in advance on the three sides of the iron core, and then place the bottom plate bottom surface 15 on the bottom surface of the iron core, and attach a pair of presser pieces 15 which are bent in advance on both sides of the bottom surface 15. ', 15' sandwich the front and rear surfaces of the iron core.

After doing so, bend the retaining claws 16.16 protruding from both lengthwise ends of each presser piece 15', 15' at a substantially right angle inward in the width direction, and
, 5 with the corresponding parts of the husband, thereby fixing the bracket 1 around the core, and the bottom plate itself is completed attached to the bracket and the core (FIGS. 5 and 6).

In the case of the present case, the bracket 1 is only attached to each side of the iron core as described above, but according to the manufacturing example of the applicant, if the bracket 1 is held firmly with the retaining claws 16 and 16 of the bottom plate 9, Similarly, the holding pieces 15', 15' provided only on the bottom plate 9 can sufficiently prevent the core from shifting, especially since it is common knowledge for this type of transformer that the entire transformer is later impregnated with varnish. It has been proven to be strong enough and will be commercialized.

However, as an aid and abetment, it is possible to further prevent the core from shifting, and also,
In an EI type transformer, etc., in order to improve the closeness between the E air core and the I air core, at least one of the required surfaces 3, 4.5 of the bracket (as shown in the figure) is (in the case of , the entire bracket), the raised stripes 18 that protrude toward the iron core are knocked out from the surface of the face part, and the entire bracket is slightly caulked and fixed with the retaining claws 16 and 16 of the bottom plate 9. It is better to concentrate the stress on the peaks of the ridges.

In this way, the required purpose can be achieved without the need for extra material parts.

Incidentally, in order to avoid hitting the iron core when caulking the retaining pawls 16.degree. 16, the width of the bracket should be made slightly wider within a range that is approximately the same as the thickness of the iron core.

In addition, double-sided adhesive tape may be used between each surface of the bracket and the corresponding surface of the iron core, or a flexible sheet material such as felt, sponge, or mat may be inserted to increase the stability of the fixation. It's okay.

As mentioned above, according to this proposal, as a result of repeated experiments and demonstrations based on a new idea, breaking away from conventional preconceptions, it was possible to create a bracket with a width approximately equal to the thickness of the iron core. This makes it possible to provide an extremely rational bracket structure that requires less metal sheet material overall, has no wasted parts, and has extremely few parts that require bending work.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional bracket structure for a transformer, Fig. 2 is an exploded plan view of the conventional bracket, Fig. 3 is a perspective view of an embodiment of the proposed bracket structure, and Figs. 4A and B are, respectively, FIG. 3 is a developed plan view of the bracket and bottom plate of the embodiment;
5 and 6 are a front view and a side view, respectively, of this embodiment after assembly is completed, and FIG. 7 is a perspective view of a bracket of a bracket structure of another embodiment. In the figure, 1 is a bracket, 2 is a transformer core, 3 is a first side surface of the bracket, 4 is a top surface, 5 is a second side surface, 9 is a bottom plate, 15 is a bottom surface, 15', 15' are front and rear holding pieces. , 16
．． 16 is a retaining claw.

Claims (1)

[Claims for Utility Model Registration] A first side surface portion along one side surface of the transformer core, an upper surface portion along the top surface of the core, and a second side surface portion along the other side surface of the core. The width of the first and second side parts and the top part is approximately the same as the thickness of the iron core, and the holding piece is bent so as to follow the front and rear surfaces of the iron core. a bracket that does not have a bracket, a bottom portion that follows the bottom surface of the iron core, a presser piece that is provided on the bottom portion and presses the front and rear surfaces of the iron core, and a bracket that is arranged at both ends of the presser piece and bent at a substantially right angle. A bracket structure for a transformer, comprising: a bottom plate having a retaining claw that presses down the first and second side portions of the bracket from the outside when the bracket is opened;