JPH02892Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a winding cover for a small transformer, and in particular, it involves winding the primary winding and the secondary winding in parallel to each other. It is a small transformer with
The present invention relates to a winding cover for a small transformer that is provided with a partition plate for partitioning the primary winding and the secondary winding.

[Problems to be solved by conventional techniques and ideas] Conventionally, in small transformers in which the primary winding and the secondary winding are wound in parallel to each other, as the size becomes smaller, both The partition plates that separate them will also become smaller.
In such a case, the creepage distance between the primary winding and the secondary winding becomes short, which tends to reduce the insulation performance, and the insulation deteriorates significantly due to the adhesion of dust and moisture during use, for example. There were concerns that the high voltage on the primary side would leak to the secondary side, causing electric shock to the user or causing a fire accident.

Japanese Utility Model Publication No. 59-42016 discloses a device in which a cover is fitted onto the primary bobbin.
However, the device described in the publication has a notch on the side surface of the cover as a means for fitting the cover onto the bobbin, and a claw portion is provided protrudingly on the inner surface of the cover. The claw portion is elastically engaged with the surface of the transformer. That is, the cover is unstable because it is fitted onto the transformer by the snapping of the claws. Furthermore, the cover cannot prevent, for example, high voltage on the primary side from leaking to the secondary side.

Further, a structure in which the bobbin is locked to the substrate by a cover is also described in Japanese Utility Model Publication No. 55-4432. However, in the case described in the publication, claw-like mounting feet are provided at both lower ends of the cover, and these are fitted into mounting holes provided in the board, so that the cover can be mounted stably. It is not possible to eliminate the defect that high voltage on the primary side leaks to the secondary side.

Therefore, in view of the defects of the prior art, 1.
A technical problem arises that must be solved in order to prevent the high voltage on the next side from leaking to the secondary side, and the present invention aims to solve this problem.

[Means to solve the problem]

The present invention was proposed to achieve the above-mentioned object, and the primary winding and the secondary winding are connected to the cover locking part of the bobbin in which the primary winding and the secondary winding are wound in parallel with each other through a partition plate. A locking portion that can be locked, and a locking portion that can substantially cover at least the outside of the periphery of the primary winding on the other front surface excluding the surface where the terminal pin is inserted into the board in this locked state. A small transformer consisting of a cover part with a flat surface and a locking claw that can be locked into a temporary fixing hole of the board when the terminal pin is inserted into the pin hole of the board, so that the transformer can be temporarily fixed to the board. In the winding cover, the partition plate is provided with a partition groove around the partition plate, and an inverted partition protrusion is provided on the inside of the winding cover at a portion facing the partition groove, and It is an object of the present invention to provide a winding cover for a small transformer, in which the winding cover is inserted into the bobbin by engaging the partitioning protrusions with the partition grooves.

[Effect]

A bobbin in which the primary winding and the secondary winding are separated by a partition plate and wound in parallel has a partition groove provided around the partition plate, and a portion facing the partition groove. An inverted-shaped partition protrusion was provided on the inside of the winding cover, and the partition protrusion was fitted into a partition groove provided on the partition plate to insert the winding cover into the bobbin. As soon as the winding cover is securely attached to the bobbin, the high voltage on the primary side may leak to the secondary side or the transformer frame, causing an electric shock to the user.
This can sufficiently prevent the risk of a fire occurring.

〔Example〕

An embodiment of this invention will be described below in detail with reference to the accompanying drawings. For convenience of explanation, conventionally known technical matters will also be explained at the same time. First, an embodiment of this invention is used in a small transformer whose perspective is shown in Fig. 1, Fig. 4 shows a perspective view, Fig. 5 shows a front view, Fig. 6 shows a bottom view, and Fig. The bobbin 1 shown in side view will be described below. This bobbin 1 is made of electrically insulating material such as synthetic resin, and
A hollow rectangular cylindrical core body 2 is provided in the center of the bobbin 1, thin side plates 3 and 4 are provided in an overhanging manner at both front and rear ends of the core body 2, and a core body is provided at the bottom of each side plate 3 and 4. a flange 5 that is substantially perpendicular to the body 2 and extends to the left and right, respectively;
A partition plate 7 is provided in the center of the core body 2 between the flanges 5 and 6, and a partition plate 7 is provided protrudingly from the outer peripheral surface of the core body 2 and 2.
The groove-shaped space formed by the side plates 3 and 4 is divided into two by the partition plate 7, one of the divided spaces is used as the primary winding groove 8, and the other The space is used as a secondary winding groove 9, and the primary winding 10 is wound in the primary winding groove 8, and the secondary winding 11 is wound in the secondary winding groove 9. It is. After winding the primary winding 10 and the secondary winding 11, the bobbin 1 can be covered with a cover 12 as shown in FIG. This cover 12 is attached to the stop I.
The terminal pins 13a, 13 provided on the bobbin 1 can be elastically locked with the locking portion J formed in the
b... is inserted into the pin holes 14a, 14a... of the board 14, and the cover 12 is provided with at least the outside of the periphery of the primary winding 10 on the other front surface excluding the insertion surface A when the... is inserted into the pin holes 14a, 14a... of the board 14. The cover 12 is provided with locking claws M, M so that the transformer 16, which has been completed with the core 15 attached, can be covered by the cover 12 as shown in FIG. As illustrated in the figure, when the terminal pins 13a, 13b, etc. are inserted into the board 14, each locking claw M is connected to the board 14
4, the terminal pins 13a, 13b...
The locking claw M and the temporary locking hole 14 prevent the transformer 16 from moving accidentally while soldering the transformer 16 to the respective circuits on the board 14.
It is configured so that it can be prevented by the locking operation of b.

The illustrated cover 12 is formed of an electrically insulating material having elasticity such as synthetic resin, and the illustrated cover part K is the left and right cover part K.
1, K1, a ceiling cover part K2, and a flange cover part K3 having an enclosing shape in bottom view, and the locking part J is a side plate part J provided approximately at right angles from the left and right cover parts K1, K1.
1. Side plate J near J1 and ceiling cover K2
1, Notches J2, J2 formed in J1, and left and right convex parts J3, J3 provided on the upper part of the collar cover part K3
and left and right cover parts K1, a partition convex part J4 which is formed to protrude inwardly from the left and right cover parts K1 and has a substantially inverted character shape when viewed from the front.
and a flange cover part K3, and the one illustrated as the cover locking part I provided on the bobbin 1 is a vertical convex strip protruding from the side plate 3 near the core insertion hole 17 of the bobbin 1. I ₁ , I ₁ , upper protrusions I ₂ , I 2 protruding from the upper part of the side plate 3 , lower protrusion _{I 3 protruding} from the vicinity of the lower part of the core insertion hole 17 , and the upper and left and right parts of the partition plate 7 When the cover 12 is placed over the bobbin ₁ , the flange cover part K3 is fitted into the flange part 5, and the outside of the side plate 3 is Side plate part J1 that covers the side surface,
The inner edge of J1 engages with the outer edges of the vertical protrusions I ₁ , I ₁ and the upper protrusions I ₂ , I ₂ , and the cover 12 is moved in the vertical, horizontal, and front-back directions with respect to the bobbin 1. The lower protrusion I 3 is substantially fixed, and the left and right protrusions J3 are engaged on the left and right sides of the lower protrusion I ₃ , and the partition protrusion J 4 is engaged with the partition groove I ₄ of the partition plate 7. The play of the left and right cover parts K1, K1 of the cover 12 is further reduced, and the cover 12 is fixed to the bobbin 1 with less play. When the terminal pins 13a, 13b... are inserted into the pin holes 14a... of the board 14 as shown in FIG.
The lower edge 7a without a groove is substantially joined to the substrate 14, so that the primary winding 10 and the terminal pins 13a, 1
3b... are the left and right cover parts K1, K of the cover 12.
1. The flange cover part K3 is covered by the partition plate 7 and the substrate 14, and is also covered by the partition groove _I4 of the partition plate 7 and the partition protrusion J4 that engages with the partition groove I4. The primary winding 10 is separated from the secondary winding 11, and in this way the primary winding 10 and its terminal pins 13a, 13b... are isolated from the outside, preventing dust and moisture from adhering to it. The cover 12 with the above structure prevents accidents such as the high voltage on the primary side leaking to the secondary side and causing electric shock to the user or fire due to the resulting reduction in insulation. This can be sufficiently prevented by

In addition, the cover part K, the locking part J,
The shape of the locking pawl M and the shape of the cover locking part I of the bobbin 1 can be various shapes other than the illustrated example, which have substantially the same functions as those described above. The number of retaining claws M may also be an appropriate number. As shown in FIG.
are provided with mounting holes 18, 18, and a closing plate 19 shaped to substantially close the lower ends of the left and right cover parts K1, K1 of the cover 12, and between the flange part 5 and the partition plate 7, as shown in FIG. As illustrated in FIG. 11, the insertion claws 19a, 19a can be inserted into the mounting holes 18, 18, so that when the transformer 15 is not inserted into the board 14, the blocking plate 19
This allows the primary winding 10 to be isolated from the outside in substantially the same way as in the case of FIG. 11.

Further, the flanges 5 and 6 of the illustrated bobbin 1 are provided with a plurality of locking grooves E, F, G, H and locking grooves, . Of the locking grooves E, F... for the primary winding 10, at least the locking groove E used for locking the winding start end 10a of the primary winding 10 is located on the inner side near the core 2 as shown in FIG. Part E1
is located close to the outer circumferential surface of the core body 2, and is formed in an inclined shape when viewed from the bottom such that the outer portion E2 is located away from the core body 2, for example to the left,
In addition, in the illustrated example, the locking grooves E and H located at the left and right outer ends in FIG. The winding start end can be locked. Therefore, the winding start end 10a of the primary winding 10 is inserted into the locking groove E, and the core 2 of the primary winding groove 8 is closed.
Wrap this primary winding 10 around a predetermined number of times, pull out the winding end part 10b from the locking groove H to the outer side of the collar part 5, and then wind the winding start end 10a around the terminal pin 13a. Wrap the terminal end 1 around the terminal pin 13e.
0b, respectively, but in this completed state of winding, the winding start end 10a of the primary winding 10 is guided by the inclined locking groove E, and at the position where it comes off from the locking groove E, Since it approaches the core 2 immediately, it is insulated from other parts of the primary winding 10 by the flange 5 without crossing it, and furthermore, because it is slanted, In the vicinity of this winding start end 10a inserted into the locking groove E, the winding is smoothly wound around the core body 2.

The illustrated bobbin 1 has winding guide convex portions 2 on the left and right sides of each of the locking grooves E, F, . . .
0 and 20 are formed in a protruding manner, for example, as illustrated in FIG. The wiring can be wired to the terminal pin 13a while being sufficiently isolated from the locking groove F and the terminal pin 13b, thereby making it possible to easily secure a sufficient creepage distance.

In addition, in the illustrated bobbin 1, as shown in FIG. 7, the inner surface portions 5a, 6a of the flanges 5, 6 are formed such that the lower portions thereof expand outward to the left and right in the figure.
The space below the primary winding groove 8 and the secondary winding groove 9 on the side is formed wide, and when the primary winding 10 and the secondary winding 11 are respectively wound, The winding thickness is made smaller in the vicinity of Q and R than in the other central parts, so that the positions of the outer corners Q and R are lower than in other parts of the primary winding 10 and secondary winding 11. It is arranged to be in the upper position.

Therefore, in this embodiment, the terminal pin 13
The winding start ends 10a, 11a, the winding end parts 10b, 11b of the primary winding 10 and the secondary winding 11 wound around a, 13e, etc., and their terminal pins 13a, 1.
3e, etc., the outer corners Q and R are at a sufficient distance upward from the solder liquid level L, which is schematically shown by the dotted line in FIG. There is no fear of contact with the solder liquid level L, and the risk of the insulation coating of the winding being destroyed by the heat of the solder liquid level L has been eliminated. Even if the temperature fuse 21 for preventing overheating of the wire is wound around the primary winding 10, in this embodiment, the inner surface portion 5a which is widened at the bottom prevents this fuse from heating.
Since the space at the bottom of the next winding groove 8 is wide, the conventional bobbin 22 illustrated in FIG. Winding wires 25, 26
Since the bulges g and r at the outer corners that appear in the bobbin 1 of the above embodiment do not occur in the bobbin 1 of the above embodiment, the fear of dielectric breakdown of the winding due to contact or proximity of the solder liquid level L is eliminated in this case as well. .

Further, the transformer 16 in the illustrated example is covered with a core cover 27 formed by bending the core 15 from a metal plate, but the left and right sides of the core cover 27 are cut and raised to form a mounting portion 28 with screw holes 28a. , 28, the transformer 16 can be securely attached to a suitable chassis using the mounting parts 28, 28.Since the transformer 16 is formed by cutting and bending, there is no separate mounting part on the core cover 27. This saved me the trouble of fixing it.

[Effect of idea]

When the winding cover is inserted into the bobbin,
Since the inverted-shaped partition protrusion protruding from the inner surface of the winding cover fits into the partition groove of the partition plate provided on the bobbin, the winding cover can be stably inserted into the bobbin. This makes it possible to prevent phenomena such as high voltage on the primary side leaking to the secondary side, transformer frame, etc., resulting in electric shock to the user or fire.

[Brief explanation of drawings]

Figures 1 to 8 and Figures 10 onward show an embodiment of this invention, with Figure 1 being a perspective view of the transformer, and Figure 2 being a perspective view of the transformer.
The figure is a perspective view of the cover placed on the bobbin, Figure 3 is a perspective view of the cover, Figure 4 is a perspective view of the bobbin, Figure 5 is a front view of Figure 4, and Figure 6 is the same as Figure 5. FIG. 7 is a side view of FIG. 5, FIG. 8 is a side view of main parts, FIG. 9 is a side view of main parts of a conventional bobbin, and FIG. 10 is a front view of FIG. 11 is a bottom view of FIG. 10, and FIG. 12 is a side view of FIG. 10. 1, 22... Bobbin, 2... Core body, 3, 4...
Side plate, 5, 6, 23, 24...flange, 5a, 6
a, 23a, 24a...inner side surface, 7...partition plate, 7a...lower edge, 8...primary winding groove, 9
...Secondary winding groove, 10...Primary winding, 10a
... Winding start end, 10b ... Winding end, 11...
...Secondary winding, 12...Cover, 13a, 13b...
...Terminal pin, 14... Board, 14a... Pin hole, 1
4b...Locking hole, 15...Core, 16...Transformer, 17...Core insertion hole, 18...Mounting hole, 19
... Closing plate, 19a ... Insertion claw, 20 ... Winding guide protrusion, 21 ... Temperature fuse, 25, 26 ... Winding wire, 27 ... Core cover, 28 ... Mounting part, 28
a... Screw hole, A... Insertion surface, E, F, G, H,
E,,,,a,b...Latching groove, E1...Inside part, E2...Outside part, I...Cover locking part, I ₁
...Vertical protruding portion, I ₂ ... Upper protrusion, I ₃ ... Lower protrusion, I ₄ ... Partition groove, J... Locking portion, J1... Side plate portion, J2... Notch, J3 ...Left and right convex parts, J4
...Convex portion, K...Cover part, K1...Left and right cover part, K2...Ceiling cover part, K3...Flame cover part, L...Solder liquid level, M...Locking claw, Q, R
...outer corner.

Claims (1)

[Scope of utility model registration request] A locking part that can be locked to a cover locking part of a bobbin in which the primary winding and the secondary winding are wound in parallel with each other through a partition plate, and a terminal pin in this locked state. A cover part that can substantially cover at least the outside of the periphery of the primary winding on the other front surface excluding the surface where it is inserted into the board, and a state in which the terminal pin is inserted into the pin hole of the board. In the winding cover of a small transformer, the winding cover of a small transformer consists of a locking pawl that can be locked into a temporary locking hole of the board to temporarily lock the transformer to the board, and the partition plate has a partition groove around it. is provided, and an inverted partition protrusion is provided on the inside of the winding cover at a portion facing the partition groove, and the partition protrusion is engaged with the partition groove so that the winding cover is A winding cover for a small transformer that is inserted into the bobbin.