JPS6234403Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a small transformer.

Generally, transformers have the risk of their coils burning out due to excessive current, which is undesirable from a disaster prevention perspective. Therefore, proposals have been made to incorporate a temperature fuse and connect the temperature fuse to the coil.

However, in conventional small transformers of this type, when connecting the lead wire at the terminal of the temperature fuse and the lead wire at the end of the coil, the two ends drawn out on the coil were twisted and connected by soldering. However, in accordance with safety standards, this type of coil requires an insulating material such as a separately prepared insulating paper to be interposed between the connecting portion and the coil, which poses a problem in that the work is complicated.

In addition, there is another type that connects the temperature fuse and the coil terminal wire through a relay terminal, etc. In this case, the material cost is increased for the relay terminal, and the space for its arrangement is also taken into consideration. The drawback was that I had to do it.

The present invention was proposed in view of the above points, and is a compact transformer that eliminates the need for the above-mentioned insulating materials and relay terminals, allows the terminals of the temperature fuse and coil to be easily connected, is easy to manufacture, and is suitable for downsizing. The purpose is to provide equipment.

The present invention will be explained below with reference to the drawings.

FIG. 1 and FIGS. 2A and 2B show an embodiment of a small transformer according to the present invention. In the figure, 1 is a coil bobbin main body, and flanges 2 and 3 are formed at both ends of the coil bobbin main body, respectively. 4 ₁ to 4 ₄ are pin terminals, and these pin terminals 4 ₁ to 4 ₄ are implanted upright in thick walled parts 5 ₁ to 5 ₄ formed on the upper surface of one flange 2, for example, at a corner. There is. 6 is a protrusion formed on one side of the flange 2 along the extending direction of the flange, and this protrusion 6 has a plate shape and protrudes slightly outward from the side end of the flange 2. In addition, cutouts 7 ₁ and 7 ₂ for guiding lead wires are formed on both sides of the protrusion 6 . Further, the protrusion 6 is provided through a notch ₇₁ in the vicinity of the thick wall portion 5 in which the pin ₄₁ , around which one of the lead wires 8a of the temperature fuse 8 is tied, is planted. A notch 6a' is formed at the tip of the portion 6. When the other lead wire 8b of the temperature fuse 8 is drawn out, for example, from the bottom of the other notch ₇₂ , this notch 6a' may be provided on the opposite notch ₇₁ side to facilitate the work of tying the lead wire together. That's preferable.
Note that the temperature fuse 8 is provided, for example, on the body 9 of the coil bobbin body 1 , or on the body 9 of the coil bobbin body 1.
It is provided between the lower winding and the upper winding wound above, and the latter aspect is generally adopted.

When assembling, one of the lead wires 8a of the temperature fuse 8 is drawn out from the bottom of one of the notches ₇₁ to the top, and the lead wire 8a is connected to the thick wall portion 5 protruding from the corner of the upper surface of the flange 2. It is pulled out to the outside through the notch 5 ₁ ′ on the outer bottom of the pin terminal 4 _{1 , and tied around the base of the pin terminal 4 1 ,} followed by soldering. Further, the other lead wire 8b of the temperature fuse 8 is drawn upward from the bottom of the other notch ₇₂ , and the protrusion 6
The coil lead wire of a coil (not shown) to be wound on the body 9 is connected to the tip of the protrusion through a notch 6a' formed at the tip of the body 9, as is well known in the art. It is sufficient to solder it together with the lead wire 8a of the temperature fuse 8. For mass production, it is preferable to perform the soldering work by immersing the product in a soldering bath, for example.
In this case, there will be no problem if, for example, thermosetting resin is used as the coil bobbin material. Note that even if the resin is a thermoplastic resin, there is no problem in practical use as long as it is a so-called fiber-reinforced plastic mixed with glass fiber or the like.

3A and 3B show another embodiment of the present invention. In this embodiment, a plurality of pin terminals _{4a 1} are attached to a thick wall portion 5a formed on one side of the flange 2a.
- 4a _o are planted along the extending direction of the flange, and a round bar-shaped protrusion 6a, for example, is integrally formed in the vicinity of the pin terminal _4a1 to which one of the lead wires 8a of the temperature fuse 8 is wound. This protrusion 6a is characterized in that it protrudes from the upper surface of the thick portion 5a of the flange 2a. That is, pin terminal 4
A protrusion 6a is formed on the upper surface of the thick part 5a ₂ , which is formed adjacent to the thick part 5a ₁ having the thickness a 1 via the notch _{7a 1, in a direction perpendicular to the pin terminals 4a 1 to 4a o} . ing.

One of the lead wires 8a of the temperature fuse 8 provided in the coil is drawn out from the bottom of one of the notches _7a1 to the top, and the lead wire 8a is connected to a guide formed at the corner of the thick part _5a1 . It is tied to the base of the pin terminal 4a ₁ through the part 5a ₁ ′, and the other lead wire 8b of the temperature fuse 8 is led out to the top through the other notch 7a ₂ and connected to the base of the pin terminal 4a ₁ . It is configured to wrap around a protrusion 6a on the upper surface of a thick portion _5a2 provided adjacent to the thick portion _5a1 .

The other configurations are substantially similar to the previous embodiments.

As described above, according to the present invention, the flange of the coil bobbin is provided with a protrusion that can easily connect the lead wire of the coil and the lead wire at the terminal of the temperature fuse. There is no need for an intervening device, which has the advantage of good workability.

Furthermore, since there is no need to use relay terminals or the like, cost increases can be suppressed.

Furthermore, there is no need to consider the space for insulating materials and relay terminals, and there is an advantage that the size can be reduced accordingly.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a small transformer according to an embodiment of the present invention showing a temperature fuse installed in the coil bobbin, Fig. 2 A is a plan view of the same, Fig. B is a side view, and Fig. 3 I , b are other embodiments of the present invention. 1 ... Coil bobbin body, 2, 2a, 3... Flange, 4 ₁ to 4 ₄ , 4a ₁ to 4a _o ... Pin terminal, 5 ₁ to 5 ₄ , 5a, 5a ₁ , 5a ₂ ... Thick part,
6, 6a...protrusion, 6a'...notch, 7, 7a ₁ ,
7,7a ₂ ... cut, 8 ... temperature fuse, 9 ...
...Torso.

Claims (1)

[Scope of utility model registration request] A protrusion is formed in the vicinity of a pin terminal around which one lead wire of a temperature fuse is embedded in the flange of the coil bobbin and is provided in a coil wound around the body of the coil bobbin, and the protrusion A small transformer in which the other lead wire of the temperature fuse and the lead wire of the coil wound around the coil bobbin are tied together and connected by soldering.