JPH0126096Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a discharge lamp ballast, and more particularly, to the structure of a bus core of a magnetic leakage transformer body fixed within a case body via a synthetic resin.

[Technical background of the invention]

In a conventional discharge lamp ballast composed of this type of magnetic leakage transformer main body, as shown in Fig. 1, the length of the bus core 1 is approximately equal to or slightly longer than the length of the iron core 2 in the stacking thickness direction. It is generally formed to have a dimension shorter than the length between the outer surfaces of the primary coil or secondary coil 3 in the stacking thickness direction. When inserting the core 2 of the primary coil and secondary coil 3, the inner diameter in the stacking thickness direction of the core 2 of the primary coil and secondary coil 3 is larger than the stacking thickness of the core 2, so when inserting the core 2 or the transformer. A structure in which, when assembling the main body 4, a spacer 5 or the like is inserted into the gap between the iron core 2 and both ends of the coil 3 so that the center position of the primary coil and the secondary coil 3 becomes the center position of the laminated thickness of the iron core 2. is taken.

[Problems with background technology]

In conventional discharge lamp ballasts, the transformer body 4 is connected to the iron core 2.
When the core 2 is housed in the cylindrical case body 6 in a direction that corresponds to the stacking thickness direction, the spacer 5 is deformed due to the weight of the core 2, as shown in FIG. , a withstand voltage failure may occur between the iron core 2 and the primary coil or the first layer of the secondary coil 3, and in the case of a large transformer body, the iron core 2 may be unbalanced due to its own weight. Coil 3 on the generated side
It has the disadvantage that the aligned winding of the coil 3 is easily damaged and the surface of the coil 3 is easily damaged.

For this reason, conventionally, the insulation distance can be maintained by increasing the gap between the coil 3 and the iron core 2 and inserting a large number of spacers 5. However, in such a configuration, the amount of time and effort required to insert the spacers, Although it can be said that this is an economical design, it takes time to insert the spacer without any gaps so that the spacer does not fall out during the transformer assembly work, and the material of the coil 3 is used to increase the gap between the coil 3 and the iron core 2. Furthermore, the structure in which a protrusion is formed on the inner bottom of the case body 6 to support the iron core 2 is also uneconomical when considering the manufacturing cost of the case body 6.

[Purpose of invention]

This invention was devised in view of the above-mentioned drawbacks, and it prevents the iron core of the transformer body housed in the case body from shifting to the bottom of the case body due to its own weight, and prevents the iron core from shifting to the bottom of the case body due to its own weight. To provide a discharge lamp ballast that prevents breakdown voltage failure and prevents the primary coil and the secondary coil from coming into contact with the inner bottom of the case body, thereby preventing the coil from collapsing in aligned winding or damaging the coil surface. It is.

[Summary of the idea]

The present invention includes a magnetic leakage transformer main body that includes an iron core, a primary coil and a secondary coil attached to the iron core, and a bus core interposed between the primary coil and the secondary coil, and a magnetic leakage transformer body that houses the main body. The main body is fixed with a synthetic resin filled with a case body, and the length of the bus core is made longer than the inner diameter of the primary coil and the secondary coil in the core thickness direction, and An engaging protrusion that expands the width of the bus core from the coil fitting part of the iron core is formed in a portion protruding from the outer peripheral surface of one of the two coils, and the stacking thickness direction of the iron core of this main body is aligned with the housing direction of the case body. The protruding end side of the bass core of the main body is housed opposite to the inner bottom surface of the case body, and the engaging protrusion of the bass core prevents slipping between the bass core and the core, and the core is prevented from slipping due to its own weight. This suppresses the downward movement and maintains a gap between the coil and the inner bottom surface of the case body.

[Example of idea]

Next, the structure of one embodiment of the present invention will be explained based on FIGS. 2 to 7 of the drawings.

10 is the main body of the magnetic leakage transformer, which includes an iron core 11, a primary coil 12, a secondary coil 13, and a bus core 14.
It is composed of. This core 11 is composed of an I-type core piece laminate 15 and an E-type core piece laminate 16.
2 and the secondary coil 13 are wound with insulating paper 17 around the parts that contact both the laminates 15 and 16, and are fitted into the fitting part 20 between the central leg part 18 and the side leg parts 19 and 19,
Both ends of the coils 12 and 13 are made to protrude from the iron core 11. Then, the I-type core piece laminate 15 is joined and welded to the E-type core piece laminate 16, and the primary coil 1
2 and the secondary coil 13 are held. At this time, iron core 1
A spacer 21 is interposed between the ends of the coils 12 and 13 and the iron core 11 so that the centers of the primary coil 12 and the secondary coil 13 are located at the center of the coil 1 in the stacking thickness direction.

Further, as shown in FIG. 5, the bus core 14 is composed of a laminated body of rectangular core pieces 22, and this bus core 14 is longer than the inner diameter of the primary coil 12 and the secondary coil 13 in the core thickness direction. At least one end thereof is long enough to protrude from the outer surface of the coils 12, 13, and one side edge of the portion of the rectangular core piece laminate 22 of the bus core 14 that protrudes from the outer surface of the coils 12, 13 is provided with an engaging protrusion. A portion 23 is formed to protrude in a stepped manner, and this engaging protrusion 23 engages the bus core 1.
The width of one end of the E-shaped core piece laminate 16 is larger than the width of the fitting portion 20 between the center leg 18 and the side legs 19, 19.

As shown in FIG. 5, this bus core 14 is wrapped with an insulating paper 24, and both ends of the insulating paper 24 are folded in and sealed with tape 25.

Further, the coil 12 of the E-shaped core piece laminate 16,
The depth of the fitting portion 20 into which the coils 13 are fitted is
13 and the thickness (l ₃ ) of the bus core 14 by about 1 _mm , and the bus core 14 is sandwiched between the fitting part 20 _of the E-shaped core piece laminate 16 on both sides. The coils 12 and 13 are fitted, and the I-shaped core piece laminate 15 is joined to this E-shaped core piece laminate 16 by welding. In this state, the iron core 11 and the coil 12,
Both laminated bodies 1
The pressure between the coils 12 and 13 and the bus core 14 is maintained between the coils 5 and 16.

Note that the bus core 14 is connected to the iron core 1 as shown in FIG.
1 and the upper edge of the engagement protrusion 23 of the bus core 14 during assembly with a small distance (l ₄ ) maintained therebetween.

Next, 26 is a case body, a synthetic resin layer 27 is thinly formed on the inner bottom of this case body 26, and the transformer body 10 is placed inside this case body 26.
The main body 10 is stored with the stacking thickness direction of the iron core 11 as the storage direction, and with the protruding end side of the bass core 14 of the main body 10 facing downward. In this state, the bass core 1 of the main body 10
The protruding ends of the coils 12 and 13 are housed opposite the inner bottom surface of the case body 26, and the coils 12 and 13 do not come into direct contact with the inner bottom surface.

Also, the iron core 11 is connected between the iron core 11 and the bus core 14.
Even if slippage occurs due to the weight of the coils 12, the core 11 is brought into contact with the engagement protrusion 23 of the bus core 14, and the core 11 is not lowered from the position of the engagement protrusion 23.
An engaging protrusion 23 is formed at a dimensional position where the core 13 is not pressed into contact with the inner bottom of the case body 26, and the core 11 is held by the engaging protrusion 23, and the center of the stacked thickness of the core 11 is The center of the coils 12 and 13 should not be misaligned.

In the above embodiment, a gap (l ₄ ) was formed between the iron core 11 and the engagement protrusion 23 of the bus core 14, but as shown in FIG. It is also possible to assemble with the parts 23 in contact with each other.

Further, the engagement protrusion 23 of the bus core 14 is connected to the rectangular core piece laminate 22 of the bus core 14, as shown in FIG.
The engaging protrusions 23 may be formed integrally with both side edges of the laminate 22, and the engaging protrusions 23 may not be formed all the way to the ends of the laminate 22, but may be formed partially. That is, the engagement protrusion 23 of this bus core 14 is connected to the iron core 1.
Any shape is sufficient as long as it can hold the iron core 11 in a position where the coils 12 and 13 do not come into contact with the inner bottom surface of the case body 26 when the coils 12 and 13 are in contact with each other.

[Effect of idea]

According to the present invention, the housing direction of the magnetic leakage transformer body housed in the case body is the stacking direction of the core, and at least one end of the bus core is longer than the inner diameter of the coil core in the stacking thickness direction. forming an engaging protrusion on the protruding portion of the bus core that extends the width of the bus core from the coil fitting portion of the iron core;
The thickness direction of the iron core of this main body is the storage direction of the case body, and the protruding end side of the bass core of this main body is stored facing the inner bottom surface of the case body, so that when the main body is stored in the case body, the bass core is The end face faces the bottom of the case body, and even if slippage occurs between the bus core and the core due to the weight of the core, the core is prevented from descending, and the coil rises from the inner bottom of the case body, allowing the coil to directly connect to the case. The coil does not come into contact with the inner bottom surface of the body, and the coil is not deformed by the weight of the core, and even when the body is housed in the case body in the same direction as the stacking thickness direction of the core, the core remains in the case body. The center position of the primary coil and secondary coil and the center of the core stack thickness are maintained in the same state without shifting to the bottom of the core, and there is no withstand voltage failure between the core and the first layer of the primary coil and secondary coil. This prevents the windings of the primary coil and the secondary coil from collapsing, and prevents damage to the coil surface.

[Brief explanation of the drawing]

Figure 1 is a front view of a part of a conventional discharge lamp ballast.
Fig. 2 is a perspective view of the transformer body of a discharge lamp ballast showing an embodiment of the present invention, Fig. 3 is a front view of a portion of the same, Fig. 4 is a front view of a portion of the ballast, and Fig. 4 is a front view of a portion of the ballast. FIG. 5 is a perspective view of the assembly process of the above bass core, FIG. 6 is a perspective view of the same bass core, and FIG. 7 is a perspective view of the bass core showing another embodiment. 10...Magnetic leakage transformer body, 11...Iron core,
12...Primary coil, 13...Secondary coil, 14
... Bus core, 20 ... Fitting portion, 23 ... Engagement protrusion, 26 ... Case body.

Claims (1)

[Scope of utility model registration request] A magnetic leakage transformer main body comprising an iron core, a primary coil and a secondary coil attached to the iron core, and a bus core interposed between the primary coil and the secondary coil, and a composite body filled with the main body. and a case body that fixes the main body with resin, the length of the bus core is longer than the inner diameter in the core thickness direction of the primary coil and the secondary coil, and at least one of the ends of the bus core is An engaging protrusion that expands the width of the bus core from the coil fitting part of the iron core is formed on a portion protruding from the outer peripheral surface of both coils, and the stacking thickness direction of the iron core of this main body is the storage direction of the case body, and the main body A discharge lamp ballast characterized in that the protruding end side of the bus core is housed opposite to the inner bottom surface of the case body.