JP3627130B2 - Resin mold type electric unit - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a resin-molded electric unit in which an electrical component is incorporated in an insulating case and then the insulating resin is filled in the case and integrally formed.
[0002]
[Prior art]
In general, in this type of resin-molded electric unit, when the cord from the internal electrical component is pulled out of the case, the cord is attached to the external drawer portion of the cord so that waterproof and dustproof measures are taken at the drawer portion. A heat-shrinkable tube mounted on the cord is attached, and the outer drawn portion of the cord is sealed by heat-shrinking the tube.
[0003]
Conventionally, when a heat-shrinkable tube is attached to the outer lead-out portion of the cord, a plurality of protrusions extending in the axial direction are provided around a seat formed so as to protrude in a cylindrical shape on the case side, and the seat portion In addition, one end of the heat-shrinkable tube attached to the cord is held (see Japanese Utility Model Publication No. 59-6881).
[0004]
[Problems to be solved by the invention]
The problem to be solved is that when a heat-shrinkable tube is attached to the externally drawn portion of the cord in the resin-molded electric unit, a plurality of axially extending seats that are formed in a cylindrical shape on the case side are extended. Providing a protrusion and holding the heat-shrinkable tube on the seat part does not provide sufficient resistance in the direction of pulling out the cord and tube, and the cord and tube are pulled out by a slight pull, which can be automated during mass production. It is a problem to try.
[0005]
[Means for Solving the Problems]
The present invention incorporates an electrical component in an insulating case and fills the case with an insulating resin so as to be integrally formed. In a resin-molded electric unit that seals the outer drawer part of the cord by attaching the tube, so that the cord and the tube can be firmly attached to the outer drawer part so that they cannot be pulled out by some pulling In addition, in order to improve the sealing performance and insulation resistance of the outer lead-out portion of the cord, the inner diameter of the seat that protrudes outward from the case is made larger than the outer diameter of the cord , by providing a plurality of protrusions to perform centering of the code to be inserted into the periphery of the inner wall of the seat, the code and a seat to be inserted in a seating So gap is evenly formed and between the its code and the heat-shrinkable tubing and the inner wall, the resin to be filled so that enters into the case to the gap.
[0006]
【Example】
1 to 3 show a transformer for lighting a HID (High Intensity Discharge) lamp as an example of a resin mold type electric unit in which the present invention is implemented.
[0007]
In this case, the transformer body is formed by inserting a secondary coil 3 in a kamaboko-shaped coil case 2 in which three conductive plates 1 are insert-molded in parallel on the peripheral surface and the bottom surface is open, and in a hollow shaft. The coil bobbin 4 having an elliptical cross section with the core 7 inserted therein is accommodated, and the coil case 2 is filled with an insulating resin to be integrally molded.
[0008]
The coil case 2 has a semi-elliptical shape corresponding to the coil bobbin 4 having an elliptical cross section.
[0009]
A cylindrical high-voltage terminal seat 6 from which the high-voltage cord 5 is drawn out is formed on one side of the coil case 2, and when the coil bobbin 4 is inserted into the coil case 2, the two are provided on one side of the coil bobbin 4. The hole of the terminal 8 to which the terminal end of the next coil 3 is connected is fitted into the core wire 51 of the high voltage cord 5 inserted into the high voltage terminal seat 6.
[0010]
A terminal 9 to which the starting end of the secondary coil 3 is connected is attached to the other side of the coil bobbin 4.
[0011]
Further, a low voltage terminal seat 13 from which two low voltage cords 11 and 12 are drawn out is formed on one side of the coil case 2.
[0012]
And the unit of the transformer main body configured in this way inserts each terminal 10 portion of the three conductive plates 1 into a hole 17 formed on the printed circuit board 16 side, as shown in FIGS. 4 and 5. It is installed on a printed circuit board 16 on which patterns P1 to P3 for connecting three conductive plates 1 in series to form a primary coil are formed.
[0013]
Heat-shrinkable tubes 14 and 15 are attached to the externally drawn portions of the high-pressure cord 5 and the two low-voltage cords 11 and 12, respectively, for waterproofing and dust-proofing measures.
[0014]
In that case, in particular, in the present invention, as shown in FIGS. 6 and 7, the heat-shrinkable tube 14 attached to the high-voltage cord 5 is attached to the portion of the high-voltage terminal seat 6 that protrudes outward from the coil case 2. When the one end of the high-voltage terminal seat 6 is held, the high-voltage cord 5 inserted into the high-voltage terminal seat 6 is made larger than the outer diameter of the high-voltage cord 5 (for example, about 0.8 to 1 mm). And the inner wall of the seat and the gap S2 between the high pressure cord 5 and the thermally contracted tube 14 are formed, and the gaps S1 and S2 are injected into the coil case 2 by potting. The resin R to be inserted enters. In FIG. 6, the arrow indicates the direction of resin injection by potting.
[0015]
Therefore, when the insulating resin R enters the gaps S <b> 1 and S <b> 2, the high-voltage cord 5 and the thermally contracted tube 14 are firmly attached to the high-voltage terminal seat 6.
[0016]
In particular, since the resin R is interposed in the gap S <b> 1 between the high voltage cord 5 and the inner wall of the high voltage terminal seat 6, the insulation of the high voltage portion in the coil case 2 can be improved.
[0017]
As shown in FIG. 7, a plurality of protrusions 18 for positioning the center of the high-voltage cord 5 inserted into the high-voltage terminal seat 6 are provided around the inner wall in the interior of the high-voltage terminal seat 6. Further, a plurality of stopper projections 19 for positioning the tip of the high-voltage cord 5 to be inserted therein are provided at the innermost part of the high-voltage terminal seat 6 around the inner wall.
[0018]
A low voltage terminal plate 22 having a hole 20 into which the core wires of the low voltage cords 11 and 12 are inserted is disposed at the innermost side of the low voltage terminal seat 13.
[0019]
Further, the high-voltage terminal seat 6 and the low-voltage terminal seat 13 are provided with step portions 23 that project annularly around the tip portions of the respective seats 6 and 13. After the heat-shrinkable tubes 14 and 15 having a slightly larger diameter than the annular step portion 23 are inserted into the respective seats 6 and 13 and attached, the tubes 14 and 15 are heated and shrunk to be strong. Try to install. In that case, it is advantageous in terms of the wearability to use a high shrinkage type of the heat shrinkable tubes 14 and 15.
[0020]
FIG. 8 shows a state in which the high voltage cord 5 with the heat shrinkable tube 14 and the low voltage cords 11 and 12 with the heat shrinkable tube 15 attached are assembled to the high voltage terminal seat 6 and the low voltage terminal seat 13. The cords 11 and 12 and the heat-shrinkable tubes 14 and 15 can be easily attached to the respective seats 6 and 13 in the vertical direction from the top to the bottom.
[0021]
【The invention's effect】
As described above, in the resin mold type voltage unit according to the present invention, when the cord is pulled out from the seat of the external drawer portion and a heat-shrinkable tube is attached to the seat to seal the external drawer portion of the cord, The inner diameter of the seat that protrudes toward the side is made larger than the outer diameter of the cord, and a plurality of protrusions are provided around the inner wall of the seat so that the center of the cord inserted into the seat is positioned. The gap is formed uniformly between the cord to be inserted and the inner wall of the seat and between the cord and the heat-shrinkable tube so that the resin filled in the case enters between the gaps. Therefore, if the cord and tube can be firmly attached to the seat of the external drawer part so that they cannot be pulled out by some pulling Moni, has the advantage that the sealing performance and resistance to dielectric edge of external lead portion of the code can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a resin mold type electric unit according to an embodiment of the present invention.
FIG. 2 is a top view of the resin mold type electric unit in the embodiment.
FIG. 3 is a bottom view of the resin mold type electric unit in the embodiment.
FIG. 4 is a perspective view showing a state where the resin mold type electric unit according to the embodiment is mounted on a printed board.
FIG. 5 is a plan view showing an example of a printed circuit board to which the resin mold type electric unit according to the embodiment is attached.
FIG. 6 is a left side view of the resin mold type electric unit in the same example.
FIG. 7 is a plan view showing details of a portion of a high voltage terminal seat and a low voltage terminal seat in the resin mold type electric unit of the embodiment.
FIG. 8 is a side view showing a state in which a high-voltage cord and a low-voltage cord each having a heat-shrinkable tube attached to the high-voltage terminal seat and the low-voltage terminal seat of the resin mold type electric unit in the same embodiment.
[Explanation of symbols]
2 Coil case 5 High-voltage cord 6 High-voltage terminal seat 11 Low-voltage cord 12 Low-voltage cord 13 Low-voltage terminal seat 14 Heat-shrinkable tube 15 Heat-shrinkable tube S1 Clearance S2 Clearance R Resin

Claims (2)

An electric part is assembled in an insulating case, and the case is filled with an insulating resin and formed integrally. A heat-shrinkable tube is attached to the external lead portion of the electric part cord. In the resin-molded electric unit that seals the outer lead part of the cord, the seat of the outer lead part of the cord protrudes outward from the case, and the heat shrinkage that is attached to the cord at the seat part One end of the tube is held, the inner diameter of the seat is made larger than the outer diameter of the cord, and a plurality of protrusions for positioning the center of the cord inserted into the seat are formed on the inner wall of the seat. by providing the periphery, so the gap is formed between and between the code and the heat-shrinkable tubing of the code and the seat of the inner wall which is inserted in a seating , A resin molded electric unit, characterized in that as a resin filled in the case to the gap enters. 2. A resin mold type electric unit according to claim 1, wherein a step portion having a diameter smaller than that of the heat-shrinkable tube projecting in an annular shape is formed around the outer lead portion of the cord.

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