JP3055542B2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for use in various consumer appliances.

[0002]

2. Description of the Related Art A conventional transformer will be described below with reference to the drawings.

FIG. 7 is an exploded perspective view of a conventional transformer, and FIG.
9 is a perspective view of the transformer, FIG. 9 is a sectional view of the transformer, FIG. 10 is an exploded sectional view of the transformer, FIG. 11 is a rear perspective view of a split core of the transformer, and FIG. 12 is a perspective view of a winding frame of the transformer. FIG.

7 to 12, a conventional transformer has an upper end flange 1 and a lower end flange 2 and a winding frame 4 having a through hole 3 in a vertical direction, and a plurality of terminals implanted in the lower end flange 2. 5, a winding 4a wound around the bobbin 4 while being connected to the terminal 5, a middle leg 6 is inserted into the through hole 3, and an upper outer leg 7 is placed on the upper end flange 1 of the bobbin 4. And a closed magnetic path core 8. The closed magnetic path magnetic core 8 is formed by combining two E-shaped divided magnetic cores 9. The divided magnetic core 9 includes a middle leg 6 inserted into the through hole 3 of the bobbin 4, and a bobbin 4
Upper leg 7 or lower outer leg 10 placed above or below
And side legs 11 arranged on the left and right side surfaces of the winding frame 4.

Then, the two divided magnetic cores 9 are inserted into the through holes 3 from above and below the winding frame 4, and the side legs 11 of the two divided magnetic cores 9 are coated with an epoxy-based adhesive 12. By joining, a sun-shaped closed magnetic path core 8 composed of the middle leg 6, the upper outer leg 7, the lower outer leg 10, and the side leg 11 is formed.

An epoxy-based adhesive 12 is also applied between the upper end flange 1 of the winding frame 4 and the upper and outer legs 7 of the closed magnetic circuit core 8, so that the upper end flange 1 of the winding frame 4 and the closed magnetic circuit The core 8 and the upper outer leg 7 are adhered. Thereby, the position of the winding frame 4 and the closed magnetic path magnetic core 8 is regulated and fixed.

At this time, as shown in FIG. 10, an adhesive 12 is applied to the back surface 13 of the upper and outer legs 7 of the closed magnetic circuit core 8, and the adhesive 12 is applied to the back surface 13 of the upper outer leg 7. Magnetic core 8
Insert the middle leg 6 into the through hole 3 of the winding frame 4, place the upper outer leg 7 on the upper flange 1, and move the upper leg 1 of the winding frame 4 and the closed magnetic circuit core 8. This is a configuration in which the legs 7 are bonded.

[0008]

In the above-mentioned conventional configuration,
An adhesive 12 is applied between the upper outer leg 7 of the closed magnetic circuit core 8 and the upper end flange 1 of the winding frame 4. Since the adhesive 12 has fluidity until the adhesive 12 hardens, the closed magnetic circuit core 8 is used. When inserting a
A part of the adhesive 12 flowed and flowed into the through-hole 3 in accordance with the displacement of the closed magnetic circuit core 8, and was hardened. Also, due to the surface tension and the capillary phenomenon, a part of the adhesive 12 flowed, flowed into the through-hole 3, and was hardened.

As a result, the closed-magnetic-path magnetic core 8 is also adhered in the through-hole 3 of the winding frame 4. For example, the temperature range when the terminal 5 is soldered to a substrate or the like, the internal temperature rise during use, When heat shock occurs due to radiant heat of the peripheral circuit or the like, a stress is applied to the closed magnetic circuit core 8 due to a difference in thermal expansion coefficient between the winding frame 4 and the closed magnetic circuit core 8, and the closed magnetic circuit core 8 is broken. Had. In particular, the adhesive 12 flowing into the through-holes 3 has a problem that stress on the magnetic core 8 is increased and cracks in the magnetic core 8 are increased.

The present invention has been made to solve the above problems, and does not allow the adhesive to flow into the through-holes, alleviates the stress on the closed magnetic circuit core during heat shock, and reduces the occurrence of cracks in the closed magnetic circuit core. It is intended to provide a reduced transformer.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a winding frame having a flange at the upper and lower ends and a through hole in a vertical direction, a terminal implanted in the lower end of the flange, While connected to the terminal, a winding wound around the winding frame, and a closed magnetic circuit core having an outer leg disposed on a flange of the winding frame, with a middle leg inserted into the through hole, A plurality of protrusions are provided on at least one of the flanges of the winding frame, and an adhesive is applied between the flange and the outer leg of the closed magnetic circuit core.

According to the above configuration, since a plurality of projections are provided on at least one of the collars of the winding frame, the outer legs of the magnetic core of the closed magnetic path come into contact with the projections of the collar. At this time, when applying an adhesive between the flange and the outer leg of the closed magnetic circuit core,
When the closed magnetic circuit core is inserted or the like, the adhesive flowing according to the displacement of the closed magnetic circuit core is mainly an adhesive applied between the protrusion of the flange and the outer leg of the closed magnetic circuit core. The adhesive applied between the protrusions does not flow much in accordance with the displacement of the magnetic core of the closed magnetic circuit.

As a result, the adhesive hardly flows into the through-hole, the degree of adhesion between the closed magnetic circuit core and the bobbin in the through hole is reduced, and the stress on the closed magnetic circuit core during heat shock is reduced. This can reduce the occurrence of cracks in the closed magnetic circuit core.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION
A bobbin having upper and lower flanges and a through hole in a vertical direction, a terminal implanted in the lower brim, a coil connected to the terminal, and wound around the bobbin; A middle leg is inserted into the hole, and a closed magnetic path magnetic core having an outer leg disposed on the collar of the reel is provided.A plurality of protrusions are provided on at least one of the collars of the reel, and the flange and the collar are provided. The adhesive is applied between the outer leg of the closed magnetic circuit core and the outer leg.

According to the above configuration, since a plurality of projections are provided on at least one of the collars of the winding frame, the outer legs of the magnetic core of the closed magnetic path come into contact with the projections of the collar. At this time, when applying an adhesive between the flange and the outer leg of the closed magnetic circuit core,
When the closed magnetic circuit core is inserted or the like, the adhesive flowing according to the displacement of the closed magnetic circuit core is mainly an adhesive applied between the protrusion of the flange and the outer leg of the closed magnetic circuit core. The adhesive applied between the protrusions does not flow much in accordance with the displacement of the magnetic core of the closed magnetic circuit.

As a result, the adhesive hardly flows into the through-hole, the degree of adhesion between the closed magnetic path core and the bobbin in the through-hole is reduced, and the stress on the closed magnetic path core during heat shock is reduced. This can reduce the occurrence of cracks in the closed magnetic circuit core.

The second aspect of the present invention is the first aspect.
In the described invention, the closed magnetic circuit core is composed of a divided magnetic core,
An adhesive is applied between the divided magnetic cores.

With the above structure, even if a thermosetting adhesive having a high adhesive strength is used, the divided cores can be adhered to each other, and the position of the winding frame and the closed magnetic path core can be regulated and fixed. Further, the occurrence of cracks in the closed magnetic circuit core can be prevented.

In general, in order to bond the divided magnetic cores to each other, it is necessary to use a thermosetting adhesive to provide a strong bond. When the core and the bobbin are bonded together,
In particular, when the cores are bonded in the through holes, the split cores are very likely to crack.

However, if this adhesive is applied between the collar of the winding frame and the outer leg of the magnetic core of the closed magnetic circuit and bonded, the adhesive hardly flows into the through-hole, and the magnetic flux closes in the through-hole. The degree of adhesion between the road core and the bobbin can be reduced, and cracks in the divided cores can be prevented.

The third aspect of the present invention is the first aspect of the present invention.
Alternatively, in the invention according to claim 2, the adhesive is an epoxy-based adhesive.

With the above structure, the divided magnetic cores can be adhered to each other and the position of the winding frame and the closed magnetic path magnetic core can be regulated even by using an epoxy adhesive which is a thermosetting adhesive having a high adhesive strength. In addition, the core can be fixed, and the occurrence of cracks in the magnetic core of the closed magnetic circuit can be prevented.

[0023] The invention according to claim 4 of the present invention is the invention according to claim 1.
In the described invention, the protrusions are provided in a staggered lattice shape.

With the above configuration, when the adhesive is applied between the flange and the outer leg of the closed magnetic circuit core, when the closed magnetic circuit magnetic core is inserted, the adhesive applied between the protruding portions is closed. Although it does not flow much according to the displacement of the magnetic core, even if it flows, the adhesive flows between the adjacent protrusions arranged in a staggered lattice, so it does not flow in one specific direction , Can be evenly dispersed, and the inflow of the adhesive into the through holes can be suppressed.

The fifth aspect of the present invention provides the first aspect.
In the invention described in the above, an outer peripheral wall is provided on the outer periphery of the through hole of the collar of the bobbin.

With the above configuration, the flange of the bobbin has the outer peripheral wall provided on the outer periphery of the through hole, so that the flow of the adhesive into the through hole can be further suppressed.

(Embodiment) A transformer according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is a perspective view of the transformer, FIG. 3 is a sectional view of the transformer, FIG.
FIG. 5 is a rear perspective view of a split core of the transformer, and FIG. 6 is a perspective view of a winding frame of the transformer.

1 to 6, a transformer according to an embodiment of the present invention includes a phenol-based winding frame 24 having an upper end flange 21 and a lower end flange 22 and having a through hole 23 in a vertical direction. , A plurality of terminals 25 implanted in the lower end flange 22, and connected to the terminals 25,
First and second windings 24a wound around
3 and the upper end flange 2 of the bobbin 24.
1 has a closed magnetic circuit core 28 on which the upper outer leg 27 is mounted.

A plurality of projections 34 are provided on the upper end flange 21 of the winding frame 24 as shown in FIG. 6, and the projections 34 are arranged in a staggered lattice pattern. 35 are provided.

Further, the closed magnetic path magnetic core 28 is formed by combining two E-shaped divided magnetic cores 29, and the divided magnetic core 29 is inserted into the through hole 23 of the bobbin 24. 26 and the upper outer leg 2 arranged above or below the bobbin 24
7 or a lower outer leg 30 and side legs 31 arranged on the left and right side surfaces of the winding frame 24.

Then, the two divided magnetic cores 29 are inserted into the through holes 23 from above and below the winding frame 24, and the side legs 31 of the two divided magnetic cores 29 are attached to each other with high adhesive strength and thermosetting properties. An epoxy adhesive 32 is applied and joined to form a middle leg 2
6, a closed magnetic circuit core 28 in the shape of a sun, formed by an upper outer leg 27, a lower outer leg 30, and a side leg 31 is formed.

An epoxy-based adhesive 32 is also applied between the upper end flange 21 of the winding frame 24 and the upper and outer legs 27 of the closed magnetic circuit core 28 so that the upper end flange 21 of the winding frame 24 and the closed magnetic circuit The core 28 and the upper outer leg 27 are adhered. Thereby, the position of the winding frame 24 and the closed magnetic path core 28 is regulated and fixed.

At this time, as shown in FIG. 4, an adhesive 32 is applied to the back 33 of the upper outer leg 27 of the closed magnetic path core 28, and the adhesive 32 is applied to the back 33 of the upper outer leg 27. The magnetic core 28 is inserted with its middle leg 26 inserted into the through hole 23 of the bobbin 24, and its upper outer leg 27 is placed on the upper end flange 21.
The upper outer leg 27 of the upper end flange 21 and the magnetic core 28 of the closed magnetic circuit are bonded.

The operation of the transformer having the above configuration will be described below. A plurality of protrusions 3 are provided on the upper end flange 21 of the winding frame 24.
4, the upper and outer legs 27 of the closed magnetic circuit core 28
It comes into contact with the protrusion 34 of the upper end flange 21. At this time, when the adhesive 32 is applied between the upper end flange 21 and the upper and outer legs 27 of the closed magnetic circuit core 28, when the closed magnetic circuit core 28 is inserted, etc. The flowing adhesive 32 mainly becomes the adhesive 32 applied between the projection 34 of the upper end flange 21 and the upper and outer legs 27 of the closed magnetic circuit core 28, and the adhesive applied between the projections 34. 32 does not flow much in accordance with the displacement of the closed magnetic circuit core 28.

As a result, almost no adhesive flows into the through hole 23, and the closed magnetic path core 28
The degree of adhesion between the core and the winding frame 24 is reduced, so that stress on the closed magnetic circuit core 28 during heat shock is reduced, and the occurrence of cracks in the closed magnetic circuit core 28 can be reduced.

Further, even if a thermosetting adhesive 32 having a high adhesive strength is used, the divided magnetic cores 29 can be adhered to each other, and the position of the winding frame 24 and the closed magnetic path magnetic core 28 is regulated and fixed. And the occurrence of cracks in the closed magnetic circuit core 28 can be prevented.

In general, in order to bond the divided magnetic cores 29 to each other, it is necessary to use a thermosetting adhesive 32 which has a high adhesive strength. When the divided magnetic core 29 and the winding frame 24 are bonded to each other, cracks are very likely to occur in the divided magnetic core 29 due to a large difference in thermal expansion coefficient, particularly when the divided magnetic cores 29 are bonded in the through holes 23.

However, if the adhesive 32 is applied between the upper end flange 21 of the winding frame 24 and the upper and outer legs 27 of the closed magnetic circuit core 28 and bonded, the adhesive 32 almost flows into the through hole 23. Instead, the degree of adhesion between the closed magnetic path core 28 and the winding frame 24 in the through hole 23 can be reduced, and the split cores 29 can be prevented from cracking.

Further, even if an epoxy-based adhesive, which is a thermosetting adhesive 32 having a high adhesive strength, is used, the divided magnetic cores 29 can be bonded to each other, and the winding frame 24 and the closed magnetic circuit core 28 can be bonded together. The position can be regulated and fixed, and the occurrence of cracks in the closed magnetic circuit core 28 can be prevented.

Since the projections 34 are provided in a staggered lattice pattern, when the adhesive 32 is applied between the upper end flange 21 and the upper and outer legs 27 of the closed magnetic circuit core 28, the insertion of the closed magnetic circuit core 28 is performed. At times, the adhesive 32 applied between the protrusions 34 does not flow much in accordance with the displacement of the closed magnetic circuit core 28, but even if it flows, the protrusions arranged in an adjacent zigzag lattice shape. Since the adhesive 32 flows between the portions 34, the adhesive 32 does not flow in one specific direction, can be evenly dispersed, and the inflow of the adhesive 32 into the through-hole 23 can be further suppressed.

In addition, the upper end flange 21 of the winding frame 24 is
Since the outer peripheral wall 35 is provided on the outer periphery of the third, the flow of the adhesive 32 into the through hole 23 can be further suppressed.

As described above, according to the embodiment of the present invention,
Since the plurality of projections 34 are provided on the upper end flange 21 of the winding frame 24, the adhesive 32 flowing in accordance with the displacement of the closed magnetic path magnetic core 28 mainly comes into contact with the projections 34 of the upper end flange 21 and the closed magnetic path magnetic field. Core 2
8 becomes the adhesive 32 applied between the upper and outer legs 27,
The adhesive 32 applied between the protrusions 34 is
8, the adhesive 32 hardly flows into the through hole 23, and the degree of adhesion between the closed magnetic circuit core 28 and the winding frame 24 in the through hole 23 decreases. As a result, the closed magnetic circuit core 28
Is reduced, and the occurrence of cracks in the closed magnetic circuit core can be reduced.

Further, even if a thermosetting adhesive 32 having a high adhesive strength such as an epoxy-based adhesive is used, the divided magnetic cores 29 can be adhered to each other, and the winding frame 24 and the closed magnetic circuit core 28 can be bonded together. The position can be regulated and fixed, and the occurrence of cracks in the closed magnetic circuit core 28 can be prevented.

Further, since the projections 34 are provided in a staggered lattice pattern, the projections 34 arranged in an adjacent staggered lattice pattern are provided.
The adhesive 32 flows in between and can be evenly dispersed without flowing in one specific direction.
The flow of the adhesive 32 into the inside can be further suppressed.

The upper end flange 21 of the winding frame 24 is
Since the outer peripheral wall 35 is provided on the outer periphery of the third, the flow of the adhesive 32 into the through hole 23 can be further suppressed.

In the present embodiment, a plurality of projections 34 are provided on the upper flange 21 and the upper flange 21 and the closed magnetic circuit core 2 are provided.
An adhesive 32 is applied between the lower outer flange 27 and the upper outer leg 27, but a plurality of projections 34 are provided on the lower flange 22, and the lower outer flange 30 is bonded to the lower outer leg 30 of the closed magnetic circuit core 28. The same effect is produced even when the agent 32 is applied. In this case, in particular, the lower end collar 22
This is effective when the adhesive is directed upward.

[0048]

As described above, according to the present invention, since a plurality of projections are provided on at least one flange of the winding frame, the adhesive flowing according to the displacement of the magnetic core of the closed magnetic circuit is mainly used. , Becomes the adhesive applied between the protrusion of the flange and the outer leg of the closed magnetic circuit core, and the adhesive applied between the protrusions does not flow much according to the displacement of the closed magnetic circuit core, Thereby, the adhesive hardly flows into the through hole, the degree of adhesion between the closed magnetic circuit core and the bobbin in the through hole is reduced, and the stress on the closed magnetic circuit core during heat shock is reduced. A transformer with reduced occurrence of cracks in the closed magnetic circuit core can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view of the transformer.

FIG. 3 is a sectional view of the transformer.

FIG. 4 is an exploded sectional view of the transformer.

FIG. 5 is a rear perspective view of a split magnetic core of the transformer.

FIG. 6 is a perspective view of a winding frame of the transformer.

FIG. 7 is an exploded perspective view of a conventional transformer.

FIG. 8 is a perspective view of the transformer.

FIG. 9 is a sectional view of the transformer.

FIG. 10 is an exploded sectional view of the transformer.

FIG. 11 is a rear perspective view of a split core of the transformer.

FIG. 12 is a perspective view of a winding frame of the transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Upper flange 22 Lower flange 23 Through hole 24 Reel 25 Terminal 26 Middle leg 27 Upper outer leg 28 Closed magnetic path magnetic core 29 Split magnetic core 30 Lower outer leg 31 Side leg 32 Adhesive 33 Back part 34 Projection 35 Outer wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-279167 (JP, A) JP-A-60-20151 (JP, A) JP-A-2-29503 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) H01F 27/26 H01F 5/00-5/06

Claims (5)

(57) [Claims] 1. A bobbin having a flange at upper and lower ends and a through hole in a vertical direction, a terminal implanted in the flange at the lower end,
While connected to the terminal, a winding wound around the winding frame, and a closed magnetic circuit core having an outer leg disposed on a flange of the winding frame, with a middle leg inserted into the through hole, A transformer in which a plurality of protrusions are provided on at least one of the collars of the winding frame, and an adhesive is applied between the collar and an outer leg of the closed magnetic circuit core. 2. The transformer according to claim 1, wherein the closed magnetic path magnetic core is formed of a divided magnetic core, and an adhesive is applied between the divided magnetic cores. 3. The transformer according to claim 1, wherein the adhesive is an epoxy adhesive. 4. The transformer according to claim 1, wherein the projecting portions are provided in a staggered lattice shape. 5. The transformer according to claim 1, wherein an outer peripheral wall is provided on an outer periphery of the through hole of the collar of the reel.