JP3620002B2 - Case for igniter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a case for an igniter for housing an igniter for igniting a gas combustion apparatus or an oil combustion apparatus with an electric spark.
[0002]
[Prior art]
An electric igniter that uses an electric spark to ignite is often used in gas burning equipment and oil burning equipment.
[0003]
This includes a printed circuit board that generates a large energy oscillating current by a self-running multivibrator system, etc., and a step-up transformer that supplies the oscillating current from the printed circuit board to the primary side and outputs a high voltage of several tens of kV to the secondary side. And in combination. Note that the high voltage generated by the step-up transformer is guided to a needle electrode disposed in the vicinity of the combustion portion via an output lead wire to generate an electric spark for ignition.
[0004]
Conventional igniters are usually configured by housing a printed circuit board and a step-up transformer in an integrated case and filling a filler such as an epoxy resin inside. This is because the filler seals the charged part and can effectively prevent insulation deterioration due to dust and moisture.
[0005]
[Problems to be solved by the invention]
According to such a conventional technology, since both the printed circuit board and the step-up transformer are accommodated in a single case, the case becomes large, the amount of filler filling is unreasonably large, and for a number of optional specifications. There is a problem that it is difficult to respond appropriately. In other words, the igniter is required to have various optional specifications depending on the mechanical specifications such as the number and position of the output lead wires in addition to the electrical specifications such as the voltage value and energy amount of the high voltage output. The option can be realized by combining a predetermined step-up transformer with a common printed circuit board. However, if the printed circuit board and the step-up transformer are housed in an integrated case, the case at that time must be made different for each option specification or large for all options.
[0006]
In addition, the case with such a large volume has a problem that it takes a long time to cure and is extremely difficult to handle.
[0007]
Therefore, an object of the present invention is to easily cope with various option specifications by separating the main body case for storing the printed circuit board and the transformer case for storing the step-up transformer, and combining them. Another object is to provide an igniter case that is extremely easy to handle.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the structure of the present invention includes a box-shaped main body case that houses a printed circuit board downward, has a partition wall lower than other side walls at the rear, and a rear portion of the main body case. A main body case is filled with the filler from above the printed circuit board, and between the filler in the transformer case and the partition wall. The gist is to fill the space together.
[0009]
An air vent hole can be provided in the bottom wall of the main body case.
[0010]
Moreover, you may form an attachment leg in a main body case.
[0011]
Furthermore, at least one of the attachment legs may be capable of attaching a grounding metal fitting.
[0012]
[Action]
According to the configuration of the present invention, the transformer case can be selected to be suitable for the step-up transformer housed inside and can be combined with the main body case, so that it can be easily adapted to any optional specifications as a whole. Is possible.
[0013]
The filler filled in the transformer case can easily achieve the insulation performance required for the step-up transformer, and the filler filled in the body case blocks the printed circuit board from the outside air and deteriorates performance due to dust adhesion etc. Can be effectively prevented.
[0014]
The low partition wall provided at the rear of the main body case allows the filler overflowing from the main body case to flow smoothly into the transformer case beyond the partition wall by filling the main body case with the filler after connecting the transformer case. It is possible to further enhance the unity between the main body case and the transformer case. In addition, an epoxy resin, a urethane resin, etc. can be used for the filler with which a main body case and a transformer case are filled.
[0015]
If the mounting legs are formed on the main body case, the whole can be fixed to any mounting location using the mounting legs, and the entire electrical grounding can be easily taken by attaching a grounding bracket to the mounting legs. Can do.
[0016]
【Example】
Hereinafter, embodiments will be described with reference to the drawings.
[0017]
The igniter case is a combination of the main body case 10 and the transformer case 20 (FIG. 1).
[0018]
The main body case 10 is a box-shaped container body with a bottom for accommodating the printed circuit board P (FIGS. 1 and 2), and is integrally formed of a suitable insulating hard plastic material. The main body case 10 includes a bottom wall 11, a front wall 12, left and right side walls 13 and 13, and a rear partition wall 14. The front wall 12 is formed with two steps 12a and 12b, and a rib 12c is erected at the center of the lower step 12b. Further, the rear partition wall 14 is lower than the left and right side walls 13, 13 and the front wall 12. In order to install the printed circuit board P above the partition wall 14 and each side wall 13, a step is provided. Step portions 14a and 13a having the same height as the upper surface of the portion 12b are formed. In addition, protrusions 14b and 14b that serve as guides when the printed circuit board P is mounted protrude from the upper end of the rear partition wall 14, and the inner side surfaces of the protrusions 14b and 14b are formed on slopes. Yes.
[0019]
The printed circuit board P is stored downward in the main body case 10 so that the electronic components P1, P1,... On the front side are on the lower side and the pattern surface on the back side is on the upper side. The input terminals Pa and Pa are assumed to protrude on both sides of the rib 12c on the step portion 12b through a slit formed in the step portion 12b. In addition, mounting legs 15 and 16 are provided on the left and right of the rear portion of the main body case 10, and one mounting leg 15 is used for inserting a grounding metal 17 in addition to the mounting round hole 15a. A slit 15b is formed (FIGS. 1 and 3), and the other mounting leg 16 is formed with a long hole 16a for mounting that opens outward. However, the slit 15b is used to bend and attach the tongue-shaped grounding metal fitting 17 whose one end is soldered to the printed circuit board P (FIG. 3). A mounting hole 17 a is formed at the other end of the grounding metal 17 corresponding to the round hole 15 a, and the grounding metal 17 extends along the surface of the mounting leg 15.
[0020]
Fitting grooves 11 a, 13 a, 13 a and fitting ribs 11 b, 13 b, 13 b are formed in parallel on the inner surfaces of the rear end portions of the bottom wall 11 and the side walls 13, 13 along the outer surface of the partition wall 14 ( 1 and 4). Further, a deep recess 11c is formed in a part of the bottom wall 11 (FIG. 2), and the recess 11c penetrates the bottom wall 11 through a small-diameter air vent hole (not shown). And
[0021]
The transformer case 20 is a container body that is open to the front and that houses the step-up transformer T (FIGS. 1 and 2). The step-up transformer T is attached with primary terminals Ta 1, Ta... Made up of bending pins, and the primary terminals Ta 1, Ta 2.
[0022]
The transformer case 20 is integrally formed of an insulating hard plastic material. The transformer case 20 has a bottom wall 21, left and right side walls 22, 22, and an upper wall 23, and the rear part is formed in a modified shape that matches the outer shape of the step-up transformer T. Cylindrical high-voltage output portions 24 and 24 are formed on both sides of the rear portion of the transformer case 20 so that the output terminals Tb 1 and Tb of the step-up transformer T composed of straight pins are respectively connected to the corresponding high-voltage output portions 24. It sticks out inside. Therefore, output lead wires (not shown) can be connected to the output terminals Tb 1 and Tb 2 by inserting them into the high-voltage output units 24 and 24.
[0023]
Fitting grooves 21a, 22a, 22a and fitting ribs 21b, 22b, 22b are formed in parallel on the outer surfaces of the front end portions of the bottom wall 21 and the left and right side walls 22, 22 (FIGS. 1 and 4). However, the fitting ribs 21b, 22b, and 22b are respectively fitted to the fitting grooves 11a, 13a, and 13a on the main body case 10 side, and the fitting grooves 21a, 22a, and 22a are respectively fitted on the main body case 10 side. It shall be adapted to the ribs 11b, 13b, 13b.
[0024]
Therefore, the transformer case 20 is configured so that the fitting ribs 22b and 22b correspond to the fitting grooves 13a and 13a, and the fitting grooves 22a and 22a correspond to the fitting ribs 13b and 13b. So that they can be integrally connected to each other (FIGS. 2 and 4). At this time, in the final stage of connection, the fitting ribs 21b and 11b can be fitted into the fitting grooves 11a and 21a, respectively, to complete the connection between the transformer case 20 and the main body case 10. Further, the primary side terminals Ta 1, Ta... Of the step-up transformer T are inserted at the leading ends Pb 1, Pb 2. By attaching, the printed circuit board P and the step-up transformer T can be electrically connected.
[0025]
After the main body case 10 and the transformer case 20 are individually completed, they are connected to each other. That is, the main body case 10 accommodates the printed board P, and the grounding metal 17 is attached through the slits 15 b of the one mounting leg 15, and one end is soldered to the printed board P. On the other hand, the transformer case 20 accommodates the step-up transformer T, is filled with the filler EX until it is almost full with the open part on the front face up and the high-voltage output parts 24, 24 on the rear part down (FIG. 2). ). At this time, the step-up transformer T has the rib T1a formed on the end surface of the bobbin T1 and the rib T1a is engaged with the positioning ribs 22c and 22c formed on the inner surface of the side wall 22 to thereby form the transformer case 20 It can be stored stably inside.
[0026]
When the filler EX in the transformer case 20 is sufficiently cured, the transformer case 20 is connected to the main body case 10 and the primary terminals Ta, Ta... Of the step-up transformer T are soldered to the eyelets Pb, Pb. . Thus, the electrical connection between the printed circuit board P and the step-up transformer T can be completed, and subsequently, the filler UX is filled into the main body case 10 from the printed circuit board P. At this time, since the bottom wall 11 of the main body case 10 has an air vent hole, the filler UX can fill the space below the printed circuit board P, and a part of the filler UX extends beyond the low partition wall 14. It flows into the transformer case 20 and can be filled into the space between the surface of the filler EX and the partition wall 14 (FIG. 2).
[0027]
When the filler UX is cured, a finished product is obtained through a predetermined inspection process. In addition, this thing can be fixed to arbitrary attachment locations using the attachment legs 15 and 16, and at this time, by fastening the grounding metal fitting 17 together using an attachment screw on the attachment leg 15 side, It is possible to take stable grounding. The entire electrical system is as shown in FIG. 5, for example.
[0028]
In the above description, when the output lead wire has only one pole instead of two poles (FIG. 6), the transformer case 20 may be provided with only one high-voltage output unit 24 on the right side or the left side in FIG. . Note that the position of the high-voltage output unit 24 at this time may be designated on the right side or the left side. Therefore, in order to cope with such an optional specification, several types of the step-up transformer T and the transformer case 20 are prepared with the dimensions related to the main body case 10 fixed, and the step-up transformer T and the transformer case 20 are selected according to the option specification. In addition, the main body case 10 can be combined. That is, the transformer case 20 is exchangeably combined with the main body case 10 according to the option specifications.
[0029]
Further, the mounting legs 15 and 16 may have the same shape, and at this time, the grounding metal 17 may be attachable to both.
[0030]
【The invention's effect】
As described above, according to the present invention, by combining the main body case and the transformer case connected to the rear portion of the main body case, many optional specifications select the transformer case that houses the step-up transformer, and the main body case Because it can be realized in combination, it can easily cope with various optional specifications, and since the main body case and the transformer case are separate, they can be easily handled individually. Has an excellent effect.
[Brief description of the drawings]
1 is an overall exploded perspective view. FIG. 2 is an explanatory view corresponding to a vertical cross section of FIG. 1. FIG. 3 is an enlarged cross sectional view corresponding to an arrow XX in FIG. Fig. 5 Electrical system diagram [Fig. 6] Main system electrical diagram [Explanation of symbols]
P ... Printed circuit board T ... Booster transformer EX, UX ... Filler 10 ... Main body case 13 ... Side wall 14 ... Partition walls 15, 16 ... Mounting leg 17 ... Grounding metal fitting 20 ... Transformer case

Claims (4)

Housing a printed circuit board down, the box-shaped body case to have a lower partition walls than the other side wall to the rear, and connected to the rear portion of the main body casing, filling the filler accommodating the step-up transformer front An open transformer case, and the main body case is filled with a filler from above the printed circuit board and also filled in a space between the filler in the transformer case and the partition wall. An igniter case characterized by that . Wherein the bottom wall of the main case, the case for an igniter according to claim 1, characterized by providing the air vent hole. The igniter case according to claim 1 or 2 , wherein a mounting leg is formed on the main body case. 4. The igniter case according to claim 3, wherein at least one of the mounting legs is capable of mounting a grounding metal fitting.

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