JP2000049021A - Electromagnetic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain electromagnetic equipment, in which the deformation and breakage of the adhesive injection guides of coil bobbins can be prevented, even when a center- leg iron core warps and an adhesive can be injected surely into a magnetic gap. SOLUTION: Electromagnetic equipment is constituted, in such a way that a center- leg iron core 21 is inserted into primary and secondary coils, which are constituted by respectively winding wires around a pair of bobbins and square frame-like side-leg iron cores 22, in which both ends of the core 21 in the longitudinal direction are press- fitted and which form a closed magnetic path together with the core 21 are arranged on the outer periphery of both coils. In addition, an adhesive 32 is injected into a magnetic gap (g) formed between the facing flange sections of the bobbins and adhesive injection guides 25 which have injection holes 26, through which the adhesive 32 is led to the magnetic gap (g) are provided to both flange sections. Moreover, recessed relieving sections 27 in which the outlets 26a of the injection holes 26 are opened are provided on the rear surfaces 25a of the guides 25 away from the upper end faces 22b of the side-leg iron cores 22, so that the collision of the guides 25 with the cores 22 caused due to the warping of the center-leg iron core 21 is absorbed by the sections 27, when the iron core 21 is press-fitted in the side-leg iron cores 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to, for example, a discharge lamp ballast such as a transformer or a choke provided in a fluorescent lighting equipment, and is particularly formed between a center leg iron core and a side leg iron core. The present invention relates to an electromagnetic device in which an adhesive is injected into a magnetic gap for magnetic leakage.

[0002]

2. Description of the Related Art As shown in FIG. 6, a discharge lamp ballast generally includes a primary coil 52 and a secondary coil 53 formed by winding electric wires around a pair of coil bobbins 50 and 51, respectively. It is known that an assembly 55 formed by fitting a center leg iron core 54 having a U-shape is disposed inside a side leg iron core 56 having a substantially rectangular shape.

In this type, the assembly 55
By pressing the longitudinal end portions 54a of the central leg iron core 54 with pressurizing tools 57 respectively, these end portions 54a are pressed into the recesses 56a of the side leg iron core 56 and mounted. Has become. FIG. 7 shows the two iron cores 5.
FIG. 4 is an exploded perspective view of the iron cores 4 and 56, in which the iron cores 54 and 56 are laminated with a core plate punched by a press, and are connected so as not to be separated by appropriate connecting means (not shown). At the same time, convex portions 57 for magnetic leakage are formed on the inner surface of the side leg iron core 56, respectively. Note that the convex portion 57 may be formed on the side surface of the center leg iron core 54 instead of the side leg 56.

[0004] By the assembly according to the above procedure,
Magnetic gaps g for magnetic leakage are formed between the front end surface of the convex portion 57 and the side surface of the central leg iron core 54 facing this (or the inner side surface of the side leg iron core 56). When the assembled discharge lamp ballast is used, the leakage magnetic path passing through the magnetic gap g is alternately formed in each cycle of the alternating current to be applied. , 56 vibrate and generate noise.

In order to prevent such vibration and noise, an adhesive is injected into the magnetic gap g and hardened.

The inventor of the present invention has shown in FIGS. 6, 8 and 9 that the thermosetting adhesive and the cold setting adhesive can be used.
And the pair of coil bobbins 5 as shown in FIG.
The structure in which the adhesive injection guides 58 are provided on the opposed flanges 50a, 51a of 0 and 51, respectively, and these guides 58 have a function as an adhesive injection jig has been previously proposed. The adhesive injection guide 58 is provided on the flange 50a,
An injection hole 58a for injecting the adhesive S into the magnetic gap g located between the holes 50b is provided.
The adhesive S extruded from the adhesive injector 59 having a lower end fitted thereto is guided to be injected into the magnetic gap g.

The provision of such an adhesive injection guide 58 on the opposed flanges 50a, 51a does not affect the injection performance of the adhesive injector 59 even when the room-temperature-setting adhesive hardens in the guide 58. It is suitable for mass production without the inconvenience that it becomes easily clogged with a cold-setting adhesive and becomes unusable as in the case of using an injection jig, and
There is no need to replace the jig, and the adhesive S can be inexpensively injected.

[0008]

However, as shown in FIG. 9, in the prior art, the flanges 50a, 51a
The back surface of the adhesive injection guide 58 formed in a single plane is formed by a single plane.
And the upper end surface 56b of the side leg iron core 56 is contacted without a gap, thereby preventing the adhesive S from escaping from the space between the back surface and the upper end surfaces 54b, 56b which are in contact with each other, and the magnetic gap g. This is a configuration in which the adhesive S flows into the device. Therefore, when the height positions of the upper end surfaces 54b and 56b of the center leg iron core 54 and the side leg iron core 56 are not uniform, it has been found that the following problems occur.

That is, as described above, the center leg iron core 54 presses both ends in the longitudinal direction thereof to form a square frame-like side leg iron core 56.
The center leg iron core 5
4 is subjected to resistance due to contact with the recess 56a of the side leg iron core 56, and as a result, the center leg iron core 54 is warped so that its center in the longitudinal direction is the lowest. Fixed to Due to the warpage of the center leg core 54, the upper end surface 5 of the side leg core 56 of the center leg core 54 on the adhesive injection guide side as shown in FIG.
The height position of the upper end surface 54b of the central leg iron core 54 on the side of the adhesive injection guide is lower than the height position of the center leg 6b. In this case, it was also found that the difference in height between the upper end surfaces 54b, 56b and the back surface was about one or two iron core plates.

For this reason, the side legs 5 of the two adhesive injection guides 58 provided so as to cover both the iron cores 54 and 56.
A load in a direction opposite to the press-fitting direction is applied to a portion contacting with the press-fitting 6, which may cause deformation or breakage of the pair of guides 58 as shown in FIG. 10. Then, the position of the injection hole 58a of the guide 58 and the magnetic gap g is misaligned, causing a problem that the injection of the adhesive S is poor.

Accordingly, a first problem to be solved by the present invention is to prevent the guide for injecting the adhesive of the coil bobbin from being deformed or broken even if the center leg iron core is warped, and to provide an adhesive to the magnetic gap. It is an object of the present invention to obtain an electromagnetic device capable of reliably injecting a gas.

Further, a second object of the present invention is to provide an electromagnetic device capable of suppressing leakage of an adhesive injected into a magnetic gap to the outside in solving the first problem. is there.

[0013]

In order to solve the above-mentioned first problem, according to the present invention, an electric wire is wound around a pair of coil bobbins having flange portions at both ends to form a primary coil and a secondary coil.
And a secondary coil, respectively, and a central leg core is fitted over the primary coil and the secondary coil, and both ends in the longitudinal direction of the central leg core are press-fitted to form a closed magnetic path together with the central leg core. Is disposed on the outer periphery of the primary coil and the secondary coil, and between the side surface of the central leg core and the inner surface of the side leg core located between the opposed flange portions of the two coil bobbins. An adhesive injection guide having an injection hole for injecting an adhesive into the magnetic gap is provided on the opposed flange portions, and is recessed on the back surface of the adhesive injection guide so as to be separated from one end surface in the thickness direction of the side leg core. And a relief portion at the bottom of which the outlet of the injection hole is opened is provided.

In the first aspect of the present invention, the clearance formed on the back surface of the adhesive injection guide forms a gap between the back surface and the side leg core covered by the back surface, so that the center leg core is connected to the side leg core. When the center leg iron core is warped as it is press-fitted and mounted, the side leg iron core is allowed to enter the gap. Therefore, it is possible to prevent the adhesive injection guide from receiving a load in a direction opposite to the direction of the press-fitting from the side leg core, and to appropriately maintain the position of the injection hole of the guide and the magnetic gap between the two cores.

In carrying out the first aspect of the present invention, as in the second aspect of the present invention, a gap between the bottom of the relief portion and one end face in the thickness direction of the side leg iron core facing the clearance portion is defined by the gap. The magnetic gap is preferably smaller than the magnetic gap communicating with the magnetic gap.
According to the second aspect of the present invention, it is difficult for the adhesive injected from the injection hole to flow into the gap side, and the adhesive can be smoothly and reliably injected into the magnetic gap.

In order to solve the second problem, the invention according to claim 3 is dependent on the invention according to claim 1 or 2, wherein one end surface in the thickness direction of the side leg iron core from the bottom of the relief portion to face the relief portion. A thin seal protrusion protruding in the direction is provided at the bottom of the escape portion.

Since the third aspect of the present invention is dependent on the second aspect of the invention, it has the following operation in addition to the operation of the first or second aspect of the invention. In other words, the degree of warpage of the center leg iron core differs according to the variation in dimensional tolerance of both iron cores,
As a result, even if the gap becomes large, the gap is locally narrowed by the seal projection, so that leakage of the adhesive from the gap to the outside can be suppressed. Moreover, since the seal projection is thin, when the seal projection receives a load in the direction opposite to the press-fitting direction as described above, only the seal projection is easily deformed. Ripple can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

The electromagnetic device according to the present embodiment is a discharge lamp ballast, which has a pair of coils 1 and 2 and a core structure 3 as shown in FIGS. The ballast body 4 is provided.

One coil 1 used as a primary coil is formed by winding an electric wire 6 around a coil bobbin 5 made of synthetic resin having flange portions 5a and 5b at both ends. Of course, a protective insulating tape 7 is wound around the wound electric wire 6, and necessary terminal fittings 8, 9 are attached to both flange portions 5a, 5b, respectively. Similarly, the other coil 2 used as a secondary coil includes flange portions 10a, 1a at both ends.
An electric wire 11 is wound around a coil bobbin 10 having Ob. Needless to say, a protective insulating tape 12 is wound around the wound electric wire 11, and necessary terminal fittings 13 and 14 are attached to both flange portions 10a and 10b, respectively.

The coil bobbins 5 and 10 of the coils 1 and 2 are formed by the same molding die, and they are arranged side by side so that the flange portions 5a and 10a are continuous in a point-symmetrical posture facing each other. . A synthetic resin containing glass fiber is used as a molding material of the coil bobbins 5 and 10. This resin product has a property of being excellent in heat resistance and being resistant to thermal deformation, but has a property that it is relatively likely to crack against mechanical deformation.

As shown in FIG. 2 and the like, the iron core structure 3
It is formed by combining a center leg iron core 21 as a first iron core and a side leg iron core 22 as a second iron core. The center leg iron core 21 is formed by laminating a plurality of iron core plates made of a thin steel plate having a substantially I shape and punched out by a press die into the same size, and connecting them by welding or other appropriate connecting means.
Both ends in the longitudinal direction of the iron core 21 form a joint end 21a, and the end face is formed by an arc surface in the width direction.

The side leg iron core 22 is formed by laminating a plurality of iron core plates made of a thin steel plate stamped by a press die to the same size in a rectangular frame shape in plan view, and by welding or other appropriate joining means. It is formed by connecting. Both cores 21, 22
Have the same thickness. Joining recesses 22a are provided on the inner side surfaces of the frame portions of the side leg iron cores 22 facing each other in the longitudinal direction. These recesses 22a are formed as recesses that are arcuate in the width direction and conform to the shape of the joint end 21a. Leaky projections 23 are integrally formed on the inner surface of the frame portion extending in the longitudinal direction of the side leg iron core 22 at the longitudinal center portion thereof.

The center leg iron core 21 is fitted inside the coil bobbins 5, 10 of the pair of coils 1, 2 arranged as described above, and is combined with the coils 1, 2. In this combined state, both joint end portions 21a of the center leg iron core 21 project from the coils 1 and 2, and both ends in the thickness direction are exposed.

The assembly of the coils 1 and 2 and the center leg core 21 is assembled inside the side leg core 26 by press-fitting both joint ends 21 a into the joint recesses 22 a of the side leg core 22. That is, after the side leg iron core 26 is supported by a jig (not shown) and set on the press-fitting machine, the assembly is positioned above the press-fitting machine, and then a pair of pressurizing tools 24 (see FIG. ) Is lowered and the upper end surface of the joint end portion 21a is pressed by these pressurizing tools 24, and press-fitting is performed so that this surface and the upper end surface of the side leg iron core 22 are flush with each other.

The ballast body 4 thus assembled is shown in FIG.
And in FIG. By this assembly, two iron cores 2
1 and 22 form a closed magnetic circuit, and a square frame-shaped side leg iron core 22 is arranged on the outer periphery of both coils 1 and 2.
Further, the leakage convex portion 23 approaches the side surface of the center leg iron core 21, and a magnetic gap g for magnetic leakage is formed between them. These magnetic gaps g are provided inside the maximum width W of the coils 1 and 2 as shown in FIG.

The opposite flange portions 5a, 10a of the pair of coil bobbins 5, 10 cover the magnetic gap g located between them and an adhesive injection guide 25 for introducing an adhesive therethrough. Are provided integrally. As shown in FIG.
The flange portions 5a and 1a are arranged so that the back surface 25a thereof comes into surface contact with the upper end surface (one end surface in the thickness direction) of the iron core structure 3.
0a and these guides 2
5 is provided with an injection hole 26 for penetrating the adhesive in the thickness direction.

The adhesive injection guide 25 includes the two cores 21, 2.
An escape portion 27 is provided on the back surface 25a which is provided over the upper end surfaces 21b and 22b of the two coil bobbins 5 and 10 and is continuous with a part of the inner surface of the coil bobbin 5 or 10. The escape portion 27 is formed so as to be depressed away from the upper end surface 22b of the central portion in the longitudinal direction of the frame portion extending in the longitudinal direction of the side leg iron core 22 and the upper end surface 21b of the central portion in the longitudinal direction of the central leg iron core 21. A magnetic gap g faces the escape portion 27 and is continuous. The depth of the escape portion 27 is, for example, equal to the thickness of the two iron core plates. The bottom 27 of this escape portion 27
The gap between a and the upper end face 22b of the side leg iron core 22 opposing it is determined by the depth, and this gap is set smaller than the gap of the magnetic gap g.

An outlet 26a of the injection hole 26 is opened at the bottom 27a of the escape portion 27 so as to face the magnetic gap g, and is closer to the frame side extending in the longitudinal direction of the side leg iron core 22 than the outlet 26a. One or more seal projections 28 are integrally formed and protrude. The seal projection 28 for locally narrowing the gap is provided so as to project toward the upper end face 22b of the side leg iron core 22 facing the bottom 27a, and is thin and tapered toward the tip. The protrusion height is set to be smaller than the gap, for example, about half of the gap.

In FIG. 4, reference numeral 31 denotes an adhesive injector, which is used with its tip inserted into the injection hole 26, and changes the internal pressure of, for example, the cold-setting adhesive 32 (see FIG. 3) to an appropriate pressure. To the injection hole 26, and the magnetic gap g
Is to be injected.

The injection of the adhesive is carried out in an assembled state in which the center leg iron core 21 passed through both the coils 1 and 2 is press-fitted into the side leg iron core 22 as described above. By this assembly, the tip end surface of the adhesive injection guide 25 formed on the flange 5a of the one coil bobbin 5 is brought into contact with the flange 5a.
While being kept in contact with the flange 10a facing the same, and the flange 1a of the other coil bobbin 10
The state where the tip surface of the adhesive injection guide 25 formed at 0a is in contact with the flange 5a facing the flange 10a is maintained. Moreover, these adhesive injection guides 25
Of the two cores 21 and 22
A gap is formed between the upper ends 21b and 22b of the magnetic cores and the upper end of the magnetic gap g formed between the iron cores 21 and 22 is provided. On the other hand, the back surface 25a of the adhesive injection guide 25 other than the escape portion 27 is
Surface contact with the upper end surface 21b without any gap. Therefore, although the gap is open only on the side of the frame portion extending in the longitudinal direction of the side leg iron core 22, the open area of this portion is also small and narrowed by the seal projection 28.

Incidentally, the center leg iron core 2
It has already been described that 1 may be curved so as to be convex downward. Adhesive injection guide 25 in such a state
FIG. 4 shows a cross section of a portion passing through the central leg iron core 21 in the case where the longitudinal central portion of the central leg iron core 21 is curved down by an amount corresponding to one iron core plate.

In such a case, both coils 1
Despite the lowering of 2, the longitudinal center of the frame portion extending in the longitudinal direction of the side leg iron core 22 which rises relatively has the escape portion 27 provided on the back surface 25a of the adhesive injection guide 25, Since it is only raised relatively within the depth range of the escape portion 27, the adhesive injection guide 25 is not pushed up by the side leg iron core 22. The absorption action of the escape portion 27 can prevent an upward load from acting on the adhesive injection guide 25 due to the press-fitting, so that the guide 25 can be prevented from being deformed or damaged.

For this reason, it is impossible to inject a product defect due to breakage of the guide 25 or to inject the adhesive 32,
It is possible to prevent the outlet 26a of the injection hole 26 of the adhesive injection guide 25 from being inclined in the direction of the side leg 22 so as to prevent the facing relationship with the magnetic gap g from being out of order, thereby causing the injection of the adhesive 32 to be defective. Injection hole 26 and magnetic gap g
Can be maintained in an appropriate state as shown in FIG.

Therefore, when the adhesive 32 is injected using the adhesive injector 31, the injection of the adhesive 32 into the magnetic gap g from the outlet 26 a of the injection hole 26 through the gap formed by the escape portion 27 is completed. It is done easily and reliably. Thereby, the vibration of the iron core plate around the magnetic gap g and the accompanying noise can be suppressed.

Moreover, in the injection of the adhesive 32,
The gap is also filled with the adhesive 32, but this gap is narrower in advance than the magnetic gap g and further narrowed by the warpage of the center leg core 21, so that the adhesive 32 can easily flow into the magnetic gap g. it can.

In addition, since the gap is narrowed in this way, the seal projection 28 protruding from the bottom 27a of the escape portion 27 comes closer to or comes into contact with the upper end face 22b. It is possible to prevent the adhesive 32 from leaking out to the outside. In the case of the present embodiment, when the central portion in the longitudinal direction of the central leg iron core 21 is lowered by one iron core plate as described above, the seal projection 28 abuts on the upper end surface 22b of the side leg iron core 22, and Since the gap is partitioned, leakage of the adhesive 32 can be reliably prevented, and the adhesive 32 can reliably flow into the magnetic gap g.

When the central portion in the longitudinal direction of the center leg iron core 21 is lowered by one or more iron core plates, the seal projection 28 comes into contact with the upper end surface 22b of the side leg iron core 22, but since this projection 28 is thin, it is thin. It can be easily deformed, and the upward load acting on the adhesive injection guide 25 from the upper end surface 22b of the side leg iron core 22 can be suppressed. Therefore, even in such a case, deformation and breakage of the guide 25 can be suppressed.

Can be eliminated.

The present invention is not limited to the above embodiment. For example, a thermosetting type adhesive may be used instead of a room temperature setting type adhesive.

Further, instead of forming the leakage convex portion 23 on the side leg core 22, the leakage convex portion 23 may be integrally formed on the side surface of the central portion in the longitudinal direction of the central leg core 21. Therefore, the present invention is also applicable to an electromagnetic device including an iron core structure including a square frame-shaped side iron core having no leakage convex portion and a substantially cross-shaped central iron core which is press-fitted and combined therein. Can be implemented.

[0042]

The present invention is embodied in the form described above and has the following effects.

According to the first and second aspects of the present invention, when the center leg core is warped as the center leg core is pressed into the side leg core for mounting, the center leg core is formed on the back surface of the adhesive injection guide. Since the adhesive injecting guide can be prevented from receiving the load in the direction opposite to the press-fitting direction from the side leg iron core by the escape portion, it is possible to prevent the adhesive injecting guide of the coil bobbin from being deformed or broken regardless of the warpage. In addition, since the position of the injection hole of the guide and the magnetic gap between the two iron cores is properly maintained, the injection of the adhesive into the magnetic gap can be ensured.

Claim 3 which depends on the invention of claim 1 or 2
According to the invention described in (1), in addition to the effects of the inventions of claims 1 and 2, a seal projection is provided to prevent the adhesive from passing through a gap formed between the side leg iron core and the adhesive injection guide. In addition, it is possible to prevent the adhesive from leaking outside through the gap regardless of the variation in the warpage of the center leg iron core.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a ballast body of a discharge lamp ballast according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the ballast body shown in FIG. 1 is assembled.

FIG. 3 is a plan view of the ballast main body shown in FIG. 2;

FIG. 4 (A) shows a state before the adhesive is injected, and FIG.
Sectional drawing of the stabilizer main body shown along the -Z line. (B) is FIG.
Sectional drawing which expands and shows the Y section in (A).

5A is a perspective view showing a configuration of a coil bobbin included in the stabilizer main body shown in FIG. 1 around an adhesive injection guide; FIG. FIG. 6B is a perspective view showing the configuration around the adhesive injection guide shown in FIG.

FIG. 6 is an exploded perspective view showing a configuration of a ballast body of a discharge lamp ballast according to a conventional example.

FIG. 7 is an exploded perspective view showing a center leg iron core and side leg iron cores included in the ballast body shown in FIG. 6;

8 is a perspective view showing the stabilizer main body shown in FIG. 6 and an adhesive injector for injecting an adhesive into the stabilizer main body.

FIG. 9 is a cross-sectional view showing a situation where an adhesive is injected into the ballast body shown in FIG. 6 by an adhesive injector.

FIG. 10 is a sectional view showing an example of a defect in the ballast body shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Primary coil, 2 ... Secondary coil, 3 ... Iron core structure, 5 ... Coil bobbin, 5a, 5b ... Flange part, 6 ... Electric wire, 10 ... Coil bobbin, 10a, 10b ... Flange part, 11 ... Electric wire, 21 ... Central leg iron core, 22 ... side leg iron core, 22b ... upper end surface (one end surface) of side leg iron core 22, 23 ... leakage convex part, g ... magnetic gap, 25 ... adhesive injection guide, 25a ... back surface of adhesive injection guide 26, injection hole, 26a, outlet of injection hole, 27, escape portion, 27a, bottom of escape portion, 28, seal projection, 32, adhesive.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 31/06 501H

Claims (3)

[Claims] An electric wire is wound around a pair of coil bobbins having flange portions at both ends to form a primary coil and a secondary coil, respectively, and a center leg iron core is fitted over the primary coil and the secondary coil. Both ends of the center leg core in the longitudinal direction are press-fitted and square frame-shaped side leg cores forming a closed magnetic path together with the center leg core are arranged on the outer periphery of the primary coil and the secondary coil. An adhesive injection guide having an injection hole for injecting an adhesive into a magnetic gap between a side surface of the central leg core and an inner surface of the side leg core located between the flange portions facing each other; Wherein an escape portion is provided on a back surface of the adhesive injection guide so as to be separated from one end surface in a thickness direction of the side leg iron core, and a relief portion is provided at a bottom thereof to open an outlet of the injection hole. Vessel. 2. A gap between the bottom of the escape portion and one end face in the thickness direction of the side leg iron core facing the escape portion, the gap being smaller than the magnetic gap communicating with the gap. Electromagnetic device according to. 3. A thin seal projection protruding from the bottom of the escape portion in the direction of one end surface in the thickness direction of the side leg iron core facing the escape portion is provided at the bottom of the escape portion. Or the electromagnetic device according to 2.