JPH0636565Y2 - Bobbin for transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer bobbin, and more particularly to a transformer bobbin used for a small transformer.

[0002]

2. Description of the Related Art The transformer illustrated in FIGS. 1 and 2 in which a primary winding 1 and a secondary winding 2 are wound in parallel with a core body 4 of a bobbin 3 has been conventionally used in the core body 4. Collar parts 5 and 5 for drawing out windings are provided orthogonally to each other so as to project to the left and right, and the primary winding 1 and the secondary winding 2 are wound around a core body 4 in each of the collar parts 5 and 5. Locking grooves a and b for inserting are provided respectively, and for example, winding c is provided in the locking groove a.
By winding a winding start end c ₁ in engagement locks and core 4 of a predetermined number of times, it is for locking the winding end portion c ₂ of the winding c to the other locking groove b. Furthermore, in the conventional trans bobbin,
The configuration to be improved by the present invention will be described with reference to FIG. In the figure, the conventional bobbin 20
Since the inner surface portions 21a and 22a of the collar portions 21 and 22 are not spread downward, the inner surface portions 21 and 22 of the collar portions 21 and 22 are in a state where the windings 23 and 24 are wound around the bobbin 20.
The bulging portions g and r are formed at the portions a and 22a, that is, at the outer corners of the windings 23 and 24, respectively.

[0003]

[Problems to be Solved by the Invention] The conventional bobbin 2 described above.
In No. 0, when the windings 23 and 24 are wound, the bulging portions g and r are generated at the outer corners of the windings 23 and 24, so that the bulging portions g and r are solder dip. During the process, there is a risk of contact with the solder liquid surface L, and the high heat of the solder liquid surface destroys the insulating coating film of the winding.

Therefore, in the solder dipping process, there arises a technical problem to be solved in order to prevent the winding from coming into contact with the solder liquid surface, and the present invention solves the problem. With the goal.

[0005]

The present invention has been proposed in order to achieve the above-mentioned object. A hollow cylindrical core body is provided in the center of a bobbin, and the front and rear ends of the core body are provided. A thin side plate is provided so as to project, and a primary winding and a secondary winding are respectively wound in a groove-shaped space formed by the side plate.
A transformer is provided in the lower portion of the side plate in a shape substantially perpendicular to the core body, and flanges are provided on the left and right sides of the core body in a protruding shape, and the flange portion is provided with a plurality of terminal pins and locking grooves, respectively. In this case, the inner side surface of each of the facing flange portions is formed so that the lower portion is laterally expanded, and the space below the primary winding groove portion and the secondary winding groove portion on the flange portion side is widened. A bobbin for a transformer, which is characterized by being formed.

[0006]

Since the inner side surface of each of the flange portions provided on the left and right sides of the bobbin is formed so that the lower portions thereof spread laterally, the groove portion for the primary winding and the secondary winding on the flange portion side are formed. When the primary winding and the secondary winding are wound, respectively, the space below the working groove is formed wider, and the winding thickness in the vicinity of each outer corner is smaller than that in the other portions. Therefore, the position of the outer corner of the winding is 1
It is located above the other parts of the secondary winding and the secondary winding. Thus, during the solder dipping process, there is no contact with the solder liquid surface, and the danger that the insulating coating film of the winding is destroyed by the high heat of the solder liquid surface is eliminated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. For convenience of description, a configuration that is conventionally known and related technical matters will be described at the same time. First, the bobbin 6 shown in a perspective view in FIG. 5, a front view in FIG. 6, a bottom view in FIG. 7, and a side view in FIG. 8 will be described. The bobbin 6 is made of an electrically insulating material such as thermosetting synthetic resin. A hollow square tubular core body 7 is provided at the center of the bobbin 6, and both front and rear end portions of the core body 7 are provided. The thin side plates 8 and 9 are provided in an overhanging shape, and the lower side of each of the side plates 8 and 9 is provided with flange portions 10 and 11 which are approximately right angle to the core body 7 and which are overhanging to the left and right, respectively.
A partition plate 1 is provided in the central portion of the core body 7 between the collar portions 10 and 11.
2, the groove-like space formed by the outer peripheral surface of the core body 7 and the two side plates 8 and 9 is divided by the partition plate 12 into two parts. The space is the groove for primary winding 1
3 and the other space as the secondary winding groove 14
The primary winding 15 is wound around the groove portion 13 for the secondary winding, and the secondary winding 16 is wound around the groove portion 14 for the secondary winding. A plurality of locking grooves E, F, G, H for pulling out the windings and locking grooves ▲ E ▼, ▲ F ▼, ▲ G are provided on the collar portions 10 and 11.
Of the locking grooves E, F for the primary winding 15, at least the locking groove E used for locking the winding start end portion 15a of the primary winding 15 is provided. And the winding end portion 15
Locking grooves H used for locking b are provided at both ends of the flange portions 10 and 11, respectively, and the locking grooves E and H have inner portions E ₁ close to the core body 7 as shown in FIG. It is formed so as to be close to the outer peripheral surface of the core body 7, and is formed in an inclined shape in a bottom view so that the outer side portion E ₂ is, for example, a position away from the core body 7 on the left side. , The locking grooves E and H located on the left and right outer sides in FIG. 7 are formed symmetrically in a bottom view when viewed from the bottom, and both locking grooves E and H are alternatively locked at the winding start end. I am able to do it. On the other hand, the collar part 10,
Terminal pins 17a and 17b for fixing the winding start end portion 15a and the winding end portion 15b are respectively provided on the bottom surfaces of the overhanging portions of the left and right end portions of 11 in a protruding manner. Therefore, the winding start end portion 15a of the primary winding 15 is inserted into the locking groove E, the primary winding 15 is wound around the core body 7 of the primary winding groove portion 13, and is wound a predetermined number of times. The terminal end portion 15b is pulled out from the locking groove H to the outside of the collar portion 10, and the terminal pin 1
The winding start end portion 15a is fixed to 7a and the winding end portion 15b is fixed to the terminal pin 17e. In this winding completion state, the winding start end portion 15a of the primary winding 15 is inclined. Guided by the locking groove E having a shape like a groove, the core 7 is immediately approached at a position where it is disengaged from the locking groove E, so that the flange portion does not cross the other portion of the primary winding 15. It is insulated by 10, and in addition, it is smoothly wound around the core body 7 in the vicinity of the winding start end portion 15a inserted into the locking groove E due to the inclined shape.

On the bobbin 6 of the illustrated example, winding guide projections 18, 18 are provided on the left and right sides of the respective locking grooves E, F ..., Locking grooves ▲ E- ▼, ▲ F- ▼. Since it is formed protrudingly,
As illustrated in FIG. 6, for example, the winding start end portion 15a pulled out from the locking groove E is sufficiently isolated from the adjacent locking groove F and the terminal pin 17b by this winding guide convex portion 18. However, since it is possible to wire to the terminal pin 17a, it is possible to easily secure a sufficient creepage distance. Further, the bobbin 6 has a collar portion 1 as shown in FIG.
The inner side surface portions 10a and 11a of 0 and 11 are formed such that the lower portions thereof are spread laterally in the left and right sides of the drawing, and the primary winding groove portion 13 and the secondary winding groove portion on the side of the flange portions 10 and 11 are formed. In the state where the space under 14 is formed wide and the primary winding 15 and the secondary winding 16 are wound, the winding thickness is smaller in the vicinity of the outer corner portions Q and R than in the other central portions. Therefore, the positions of the outer corner portions Q and R are located above the other parts of the primary winding 15 and the secondary winding 16.

Therefore, in this embodiment, the winding start ends 15a and 16a and the winding end 15 of the primary winding 15 and the secondary winding 16 wound around the terminal pins 17a, 17b ...
b, 16b and the solder dipping process for soldering these terminal pins 17a, 17e, etc., the outer corners Q, R from the solder liquid level L, which is schematically shown by the dotted line in FIG. There is no possibility of contacting the solder liquid surface L at a position sufficiently distant upward, and the risk that the insulating coating film of the winding is destroyed by the heat of the solder liquid surface L can be eliminated. As illustrated in FIG. 9, even if the temperature fuse 19 for preventing overheating of the winding is wound around the primary winding 15, for example, in this embodiment, the inner surface portion 10a having a lower expanded shape is formed. Since the space under the primary winding groove portion 13 is widened by the above, the conventional bobbin 20 (the inner side surface portions 21a of the collar portions 21 and 22 shown in FIG.
22a is not the lower spreading shape) The bulging portions g and r of the outer corner portions appearing in the windings 23 and 24 wound around the lower portion 22b do not occur in the bobbin 6 of the above-mentioned embodiment. The risk of dielectric breakdown of the winding due to contact and approach of the is eliminated.

The bobbin 6 on which the primary winding 15 and the secondary winding 16 have been wound can be covered with the cover 25 illustrated in FIG. 11, and is provided on the bobbin 6. It is made possible to elastically lock the locking portion J formed on the cover 25 to the cover locking portion I, and in this locked state,
By the cover portion K provided on the cover 25, the substrate 29
Other than the mounting surface A on the whole surface, at least the primary winding 15
The outer periphery of the transformer can be covered as shown in FIG. 12, and the cover 25 is provided with locking claws M, M, and the transformer 28 completed by mounting the core 27 is shown in FIG.
, The pin holes 29a of the substrate 29, 29a ...
In the state where the terminal pins 17a, 17b ... Are inserted in the terminal pins 17a, 17b, ..., The respective locking claws M can be inserted into the temporary fixing holes 29b, 29b of the substrate 29 and can be locked, respectively.
It is configured so that the delusion of the transformer 28 while soldering 7b to the respective circuits of the substrate 29 can be prevented by the locking operation of the locking claw M and the temporary stop hole 29b. The illustrated cover 25 is formed of an electrically insulating material having elasticity such as synthetic resin, and the illustrated cover portion K includes left and right cover portions K ₁ and K _1, and a ceiling cover portion K ₂ . It consists bottom view囲状of the flange cover portion K ₃ Metropolitan locking portion J is provided with the side plate portion J _1, J ₁ provided substantially right angles from the left and right cover portions K _1, K _1, a ceiling cover K ₂ Notches J ₂ and J ₂ formed in the side plate portions J ₁ and J ₁ near the base, the left and right convex portions J ₃ and J ₃ provided on the upper part of the collar cover portion K ₃ , and the left and right cover portions K ₁ and The cover locking portion I provided on the bobbin 6 is composed of a partition ridge J ₄ having a substantially inverted U-shape in a front view, which is formed to project inward from K _1, and a collar cover K _3. The vertical ridges I ₁ and I ₁ projecting on the side plate 8 near the core insertion hole 30 of the bobbin 6 and the upper part of the side plate 8 are illustrated as examples. Upper ridges I ₂ and I ₂ , lower ridges I ₃ protruding near the lower portion of the core insertion hole 30, partition groove portions I ₄ provided on the upper and left and right portions of the partition plate 12, and the collar portion 10. The cover 25 and the bobbin 6
When covered, the collar cover portion K ₃ is fitted to the collar portion 10 and the inner edges of the side plate portions J ₁ , J ₁ covering the outer side surface of the side plate 8 have vertical ridges I ₁ , I ₁ and upper convex portions. By engaging with the outer edges of the strips I ₂ and I ₂ , the cover 25 is substantially fixed to the bobbin 6 in the vertical, horizontal, and front-rear directions, respectively. right and left protrusions J ₃ to the left and right _3, J ₃
And the partition ridge J ₄ engages with the partition groove I ₄ of the partition plate 12, so that the left and right cover portions K ₁ of the cover 25,
The rattling of K ₁ is further reduced, and the cover 25 is fixed to the bobbin 6 with less rattling.

When the cover 25 is thus covered and the terminal pins 17a, 17b ... Are inserted into the pin holes 29a ... of the substrate 29 as shown in FIG. Since the edge portion 12a is substantially joined to the substrate 29, the primary winding 15 and the terminal pins 17a and 17b are formed.
Is to be covered by the left and right cover portions K ₁ and K ₁ of the cover 25, the collar portion cover portion K ₃ , the partition plate 12 and the substrate 29, and the partition groove I ₄ of the partition plate 12 and this. The primary winding 15 is partitioned from the secondary winding 16 by the corresponding partition ridge J ₄ and thus the primary winding 1
5 and its terminal pins 17a, 17b ... Are isolated from the outside, so that, for example, a high voltage on the primary side leaks to the secondary side due to the adhesion of dust and moisture and the resulting deterioration in insulation, The cover 25 having the above-described structure can sufficiently prevent accidents such as electric shock to the user and occurrence of a fire accident.

The shapes of the cover portion K, the engaging portion J, and the engaging claw M of the cover 25 and the shape of the cover engaging portion I of the bobbin 6 have substantially the same functions as those described above except for the illustrated example. Various other shapes can be used. Also, the cover 25 of the illustrated example is provided with mounting holes 31 and 31 in the left and right cover portions K ₁ and K ₁ in the vicinity of the collar portion cover portion K ₃ as shown in FIG. Left and right cover parts K ₁ , K
A closing plate 32 having a shape capable of substantially closing the lower end portion of ₁ and between the collar portion 10 and the partition plate 12 is attached to the mounting holes 31 and 31 by inserting the inserting claws 32a and 32a. Therefore, in the case of a use example in which the transformer 28 is not attached to the substrate 29, the primary winding 15 can be isolated from the outside by the closing plate 32 in substantially the same manner as in the case of FIG.

In the illustrated transformer 28, the core 27 is covered with a core cover 33 formed by bending a metal plate. The right and left portions of the core cover 33 are cut and raised to screw holes 34a.
Since the transformer 28 can be firmly attached to an appropriate chassis by using the mounting portions 34, 34 having a certain shape, and since the transformer 28 is formed by the cut-and-raising process, it is possible to save the labor for fixing the separate mounting portion to the core cover 33. I was able to do it.

[0014]

As described in detail in the above-mentioned one embodiment, the present invention forms the inner side surface of the flange portion such that the lower portion is spread laterally outward and the primary winding and the secondary winding are respectively wound. In the state, the winding thickness is smaller in the vicinity of the outer corner portion than in other portions, and the position of the outer corner portion is higher than the other portions of the primary winding and the secondary winding. Will be located.
Therefore, during the solder dipping process, the outer corners are not sufficiently separated from the solder liquid surface to come into contact with the solder liquid surface. Thus, the danger that the insulating coating film of the winding is destroyed by the heat of the liquid surface of the solder at the outer corner portion as in the conventional case can be completely eliminated.

[Brief description of drawings]

FIG. 1 is a front view of a conventional bobbin for a transformer.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a side view illustrating the same main part.

FIG. 4 is a perspective view of the transformer of the present invention.

FIG. 5 is a perspective view of the bobbin.

FIG. 6 is a front view of the bobbin.

FIG. 7 is a bottom view of FIG.

FIG. 8 is a side view of FIG.

FIG. 9 is a side view for explaining the main part of the same.

FIG. 10 is a perspective view of a cover.

FIG. 11 is a perspective view of the bobbin covered with a cover.

FIG. 12 is a front view of FIG. 11.

13 is a bottom view of FIG.

14 is a side view of FIG.

[Explanation of symbols]

 6 bobbin 10,11 collar part 10a, 11a inner side surface part 13 primary winding groove part 14 secondary winding groove part 15 primary winding 15a, 16a winding start end part 15b, 16b winding end part 16 secondary winding 17a, 17b Terminal pin

Claims (1)

[Scope of utility model registration request] 1. A hollow cylindrical core body is provided in the center of a bobbin, thin side plates are provided at both front and rear ends of the core body, and a groove-shaped space formed by the side plates is provided. A secondary winding and a secondary winding are respectively wound, and further, a flange portion is provided in a lower portion of the side plate in a shape substantially perpendicular to the core body, and projecting to the left and right of the core body, and the flange portion is provided. In a transformer provided with a plurality of terminal pins and locking grooves respectively, a lower part of each of the facing flanges is formed to expand laterally, and
A bobbin for a transformer, characterized in that a space below the groove portion for the secondary winding and the groove portion for the secondary winding is formed wide.