JPH0451454Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a casing for a transformer.

(Conventional technology) A conventional transformer is shown in FIG.

A coil is formed by winding a conducting wire (not shown) around a bobbin 100, and a primary coil and a secondary coil are arranged in parallel in the direction of the axis of the bobbin 100 (perpendicular to the plane of the paper). Note that the bobbin 100 for the primary coil and secondary coil is integrally formed.
Furthermore, a predetermined clearance is formed between the primary coil and the secondary coil in the axial direction of the bobbin 100 to ensure a predetermined creepage distance, and the coils are wound.

102... is a lead wire provided on the bottom surface of the bobbin 100, to which the ends of the conductive wires of both the coils are connected. The transformer 104 formed in this way is connected to the connection hole 1 formed in the circuit board 106.
08... The lead wire 102 is inserted into the circuit board 106 and fixed by soldering on the back surface of the circuit board 106. Further, the bobbin 100 is wrapped around the bobbin 100 with an insulating tape 110 for the purpose of insulating the coil from the outside and preventing moisture.

In addition, in order to increase the creepage distance, a groove is carved in the clearance between the primary coil and the secondary coil, and a spacer piece that can be fitted throughout the groove is provided to insulate the outer periphery. A transformer that is wrapped with tape is also known.

(Problems to be solved by the invention) However, the conventional transformer described above has the following problems.

When assembling a transformer, the work of winding the conductor around the bobbin, connecting the lead wire and the conductor, and then wrapping insulating tape around the bobbin is done manually, but this winding work is very tedious and difficult to work with. There is a problem that it is bad. Furthermore, when exporting, there are restrictions on the thickness of the insulating tape depending on the country, which may further increase the burden on the workers. Creepage distance also differs depending on the country, and there is a problem in that work efficiency is further reduced when the work of fitting spacer pieces is added to increase the creepage distance.

Furthermore, since the lead wires and their rigidity are small, they tend to bend easily, making it difficult to smoothly attach the transformer to the circuit board unless the lead wires are adjusted to the desired position before being inserted into the connection holes of the circuit board. There are also points.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a transformer casing that is easy to assemble and easy to attach to a circuit board.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

Namely, the base is made of an insulating material, on which the transformer can be mounted, and has a small hole in the bottom through which the lead wires of the transformer can be inserted; , comprising a cover that can cover the transformer placed on the base, and a distance expanding means for increasing the creepage distance between the coils of the transformer inside the base and/or the cover. shall be.

(effect) The operation will be explained with reference to FIG.

The lead wire 22 of the transformer 10 is inserted into the through hole 24 of the base 12, and the lead wire 22 is inserted into the through hole 24 of the base 12.
It is possible to perform positioning.

When attaching the transformer 10 to the base 12, spacer pieces 16a and 16b serving as distance expanding means are fitted to the sides of the groove 42 of the bobbin 20, and when the cover 30 is placed on the spacer piece 16c is fitted to the upper side of the groove 42. By covering the coils 38a and 38b, the creepage distance between the coils 38a and 38b can be increased.
It becomes possible to insulate 8a and 38b from the outside.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration will be explained.

In FIG. 1, 12 is a base, and spacer parts 14a and 14b are vertically provided along the inner wall surface. Spacer pieces 16a, 16b serving as distance expanding means are arranged at the center of the spacer parts 14a, 14b.

18a and 18b are guide pieces, and the transformer 1
The end face of the bobbin 20 of 0 is guided. The bottom surface of the base 12 is provided with through holes 24 through which the lead wires 22 of the transformer 10 are inserted.

Reference numerals 26, . . . designate hooks protruding from the outer wall of the base 12, which have a substantially right-angled triangular cross section, and are formed so as to be able to hook into a hook hole in a cover, which will be described later. Furthermore, hooks 28 are arranged at the bottom of the base 12. The hooks 28 have a curved outer surface at the tip and are arranged to be hooked into a through hole drilled in a circuit board (not shown) to fix the transformer 10 to the circuit board. The base 12 is formed by resin molding so that the spacer parts 14a, 14b, the hook parts 26..., the hooks 28... are integrated.

Reference numeral 30 denotes a cover, which is shaped like a box with an open bottom. A latching hole 32 is provided on the side surface of the cover 30 corresponding to the latching portion 26 bored in the base 12.
... has been drilled. A protrusion 36 is provided on the upper surface 34.
A spacer piece 16c serving as a distance expanding means is provided inside the protrusion 36 and on the ceiling surface.

Next, the transformer 10 will be explained. The transformer 10 includes a bobbin 2 made of an insulating material such as resin.
Coils 38a and 38b are arranged in parallel in the axial direction of zero. A flange portion 40a is provided between both coils 38a and 38b, and a groove 42 is formed in the center on both sides and the top side. Coils 38a, 38
Flange portions 40b and 40c are also provided on the end faces of the coils 38a and 40c on the sides that are not adjacent to each other.
A predetermined number of lead wires 22 . . . are arranged on the bottom surface of the bobbin 20, which prevents loosening of the bobbin 38b in the axial direction, and are connected to the conducting wires of the coils 38a and 38b.

Next, a method of housing the transformer 10 in the transformer casing composed of the base 12 and the cover 30 will be described.

The position of the transformer 10 is confirmed by the number of lead wires 22 . . . and the through holes 24 . The groove 4 on the side of the flange portion 40a of the transformer 10
2, the spacer pieces 16a and 16b arranged on the spacer parts 14a and 14b of the base 12 are inserted into the spacer parts 14a and 14b.
At that time, the lead wires 22... are inserted into the corresponding through holes 24.... Lead wire 22
... is inserted into the through hole 24 ..., the position of the lead wire 22 ... is determined, and the lead wire 22 ... is inserted into the through hole 24 ....
This makes it easy to insert the wire into the connection hole of the circuit board (not shown).

After the transformer 10 is fixed to the base 12, the cover 30 is placed on it. At that time, the spacer piece 16c in the cover 30 is fitted into the groove 42 on the upper side of the flange portion 40a so that the spacer piece 16c can be inserted into the groove 42 on the upper side of the flange portion 40a, and the latching portion 26 protruding from the base 12 and the latching hole 32 of the cover 30 are inserted. ... to insulate the coils 38a, 38b of the transformer 10 from the outside. The transformer unit thus assembled is constructed by inserting the lower ends of the lead wires 22 into connection holes of the circuit board (not shown), and connecting the hooks 28 provided at the bottom of the base 12 with the through holes of the circuit board (not shown). Hang it to secure it.

Next, another embodiment will be described with reference to FIG.

In this embodiment, a spacer piece 80 is provided on the inner surface of the cover 82 to increase the creepage distance, and is integrally molded in resin with the cover 82 together with guide pieces 84a and 84b for positioning a transformer (not shown). ing. Therefore, no spacer piece is provided on the base 86, and the through holes 88, the hooks 90, and the hooks 92 are provided in the same way as in the embodiment shown in FIG.
is only provided. To install a transformer (not shown) (same type as the transformer shown in FIG. 1), first align the lead wires of the transformer with the through holes 88 of the base 86, and then insert the spacer pieces 80 of the cover 82 onto the transformer bobbin. Insert it into the groove, and connect the locking hole 94 of the cover 82 and the locking part 9 of the base 86.
0... should be hooked.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments. For example, the thickness of the cover may vary depending on the required thickness of the coil insulation. It goes without saying that many modifications can be made without departing from the spirit of the invention, such as allowing the cover to have any desired thickness and providing a groove on the cover side as a distance widening means.

(Effects of the invention) When the transformer casing according to the invention is used, the transformer is covered with a cover, so it is possible to omit the cumbersome and time-consuming work of wrapping insulating tape in the conventional transformer assembly process. Therefore, it is possible to improve the workability of assembling the transformer, and it is also possible to reduce costs. In addition, since the spacer pieces for increasing the creepage distance are integrally provided on the base and/or the cover, the conventional process of fitting the spacer pieces and wrapping the insulating tape can be replaced with the process of fixing the cover to the base. It can be reduced to one process.

Additionally, if covers of a certain thickness are mass-produced, there is no need to constantly pay attention to the thickness of the insulating tape, which is the case in the past, reducing the burden on workers and improving productivity. It has the remarkable effect of being able to

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a casing of a conventional transformer, FIG. 2 is an exploded perspective view of another embodiment, and FIG. 3 is a front view of the conventional transformer. 10...Transformer, 12...Base, 16a, 1
6b, 16c... Spacer piece, 20... Bobbin,
22...Lead wire, 30...Cover, 38
a, 38b...coil, 42...concave groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A base made of an insulating material, on which a transformer can be placed, and a base having a small hole drilled in the bottom through which a lead wire of the transformer can be inserted; a cover whose lower surface is open and which can cover the transformer placed on the base; and a distance expanding means for increasing the creepage distance between the coils of the transformer inside the base and/or the cover. A transformer casing characterized by comprising: