JP2000260641A - Booster apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a booster apparatus which can increase a strength of a printed circuit board mounted to a lower opening of a transformer casing and can secure the heat insulating property of a ignition transformer. SOLUTION: Projected partition plates 31 are provided on a lower surface of a connection step 30 of a transformer casing 1 having needle-shaped output terminals 3 embedded therein, so that the plates 31 are projected downwards between the output terminals 3, a printed circuit board 8 is formed with associated long grooves 34a to 34c which are to be fitted by the projection plates 31 and which are extended inwards from its inner end as non-continuously with injection holes 9 and 9, and the connection step is formed with a groove 35 for insertion of an insulating sealing agent between the projection plates 31, thus improving a strength of the board. For this reason, upon mounting an ignition transformer on the board 8 or upon mounting an ignition transformer 5 thereon, even when the mounting causes a stress in the board, the board is less damaged or cracked. Further, since the connection step is formed in its inner surface with the insertion groove 35 to secure a sufficient filling space of the sealing agent, the sealing agent causes heat generated from the ignition transformer 5 to be cut off and a heat insulating property to be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a booster for boosting a primary voltage by an ignition transformer to generate a high voltage.

[0002]

2. Description of the Related Art As shown in FIG. 6, an ignition transformer b is accommodated in a transformer case a, and an output voltage generated from a secondary coil d wound around a secondary bobbin c of the ignition transformer b is applied to the transformer case a. High-voltage cord f which is led out to a needle-like output terminal e implanted on one side of the
There is known a booster in which a high voltage generated from the ignition transformer b is used for spark ignition or the like.

In the conventional booster, the connection between the secondary coil d of the secondary bobbin c and the output terminal e is made by direct connection with a lead g, and the lead g is connected to a transformer. It is designed to be embedded in the insulating sealant h filled in the case a. For this reason, the connection work of the lead wire g is troublesome, and the lead wire g may be cut by mistake during wiring. In particular, as described above, when used for a discharge booster, the number of connected lead wires g is large, and the wiring is further complicated. Further, when the insulating sealant h is filled after the wiring operation, the injection pressure may sometimes cause a subsequent disconnection.

[0004]

In order to solve the above-mentioned problem, a printed circuit board is disposed at an opening on the lower surface of a transformer case accommodating an ignition transformer, and a secondary coil is connected to a secondary bobbin of the ignition transformer. The connecting pins are inserted into through holes of the printed circuit board, and the needle-like output is formed on a connecting step formed on one side of the transformer case and having a plurality of high-voltage cord insertion holes. The terminal is inserted into each insertion hole and held, and the lower end of the needle-shaped output terminal is inserted into the through hole of the printed circuit board, and the connection pin and the needle-shaped output terminal are connected via the conductive path formed on the printed circuit board. There has been proposed a booster which is electrically connected and further has an insulating sealant filled in a transformer case through an injection hole formed in a printed circuit board.

[0005] In this configuration, the output terminal and the secondary coil are electrically connected to each other through a conductive path on the printed circuit board without the need for a lead wire. In contrast, the connection process is easy, the workability is good, and there is no possibility of poor connection.
In addition, there is an advantage that late disconnection can be avoided.

In this configuration, a partitioning projecting plate is projected downward between the needle-like output terminals on the step surface of the connection step portion where the needle-like output terminals are implanted, and is inserted into the through hole in the printed circuit board. There has been proposed a configuration in which a plurality of linking long grooves are formed between the conductive paths connected to the respective needle-shaped output terminals, and a partitioning protruding plate is inserted into the linking long grooves. As a result, the creepage distance between the conductive paths is increased by the linking long grooves, and the linking long grooves are fitted with the partitioning projecting plates of the transformer case made of an insulating material. Secured.

Further, in such a configuration, the linking long groove is elongated to be continuous with the injection hole, and the continuous inner edge of the linking long groove and the injection hole forms a creepage between the conductive paths on the substrate connected to the needle-like output terminal. The distance is increased to ensure insulation between the conductive paths. By the way, when the linking long groove and the injection hole are connected in this way, a groove extending deeply in the printed board is formed in a transverse shape, and the strength of the board is remarkably reduced. When a stress is applied during the mounting work on the printed circuit board or when the ignition transformer is mounted on the transformer case, the printed circuit board may be broken or cracked. SUMMARY OF THE INVENTION It is an object of the present invention to increase the strength of a printed circuit board and ensure the heat insulation of an ignition transformer.

[0008]

According to the present invention, a printed circuit board is disposed in an opening on the lower surface of a transformer case accommodating an ignition transformer, and a connection pin for connecting to a secondary coil is provided on a secondary bobbin of the ignition transformer. The connection pins are inserted into the through holes of the printed circuit board, and the needle-shaped output terminals are inserted into the connection holes formed on one side of the transformer case and provided with a plurality of high-voltage cord insertion holes. The lower end of the needle-shaped output terminal is inserted into a through hole of a printed circuit board, and the connection pin and the needle-shaped output terminal are electrically connected via a conductive path formed on the printed circuit board. And a step-up device in which an insulating sealant is filled into a transformer case through an injection hole formed in a printed circuit board, wherein each of the needle-like output terminals is partitioned on the step surface of the connection step. Veneer Along with the projections, a linking long groove extending inward from the edge into which the partitioning protruding plate fits is disposed on the printed circuit board so as to be discontinuous with the injection hole, and further, on the inner surface of the connection step portion, A step-up device characterized in that an intrusion groove for an insulating sealant is formed at a position between the partitioning projecting plates.

As described above, the linking long groove is made discontinuous with the injection hole. For this reason, a deep groove is not continuously formed in the printed board, and the strength of the board is improved. By the way, when the linking long groove and the injection hole are discontinuous, the creepage distance is defined only by the linking long groove and becomes short. Therefore, the printed board is widened, the linking long groove is made as long as possible, and the partitioning protruding plate fitted in the linking long groove is made as long as possible. Insulation measures are taken to ensure insulation by insulating each conductive path insulatively. By the way, when the partitioning plate is secured long as described above, the step surface formed by forming the partitioning plate becomes wide, and it is not possible to secure a filling gap of the sealant between the ignition transformer and the connection step. However, the heat generated from the ignition transformer cannot be sufficiently shut off. In addition, the insulation of the ignition transformer by the sealant tends to be insufficient. Therefore, a sealing agent intrusion groove is formed between the partitioning protruding plates on the inner surface of the connection step, and a sufficient filling gap of the sealing agent is secured between the ignition transformer and the connection step by the penetration groove. I have to. Thus, with this configuration, the strength of the printed circuit board is improved, and the insulation between the conductive paths and the insulation of the ignition transformer are ensured.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. As shown in FIGS. 2 to 4, each needle-shaped output terminal 3 is provided on a step surface 32 of a connection step 30 of the transformer case 1 in which a plurality of high-voltage cord insertion holes 2 through which the needle-shaped output terminals 3 are inserted. In the figure, the three partition projecting plates 31 are projected downward. On the other hand, in the printed circuit board 8, linking long grooves 34a to 34c into which the partitioning protruding plates 31 are fitted are formed linearly from the edges to the back. The link length grooves 34a to 34c
Are formed so as to be discontinuous with the circular injection holes 9, 9,
Only the central linking long groove 34b between the injection holes 9, 9 has a slightly longer dimension. And by this, each linking long groove 34
The conductive paths 10a to 10d (see FIG. 4) connected to the respective needle-shaped output terminals 3 located on both sides of the terminals a to 34c are insulated from each other.

On the other hand, in order to make the partitioning protruding plate 31 as long as possible and to secure a sufficient space for filling the insulating sealant 6 between the ignition transformer 5 and the connecting step 30, the connecting step is required. Entry groove 3 of sealant 6 between partitioning protruding plates 31 on the inner surface of 30
5 are formed.

As described above, the linking long grooves 34a to 34c are
The substrate strength is improved by being formed so as not to be continuous with the injection holes 9 and 9. Therefore, when mounting the ignition transformer 5 on the printed circuit board 8 or mounting it on the transformer case 1 with the ignition transformer 5 mounted,
Even if stress is applied, the printed circuit board 8 hardly breaks or cracks. Thus, the link length grooves 34a to 34c
When the injection holes 9 and 9 are discontinuous, the creepage distance is defined and shortened only by the linking long grooves 34a to 34c. Thus, the conductive paths 8a to 8d on the printed circuit board connected to the needle-shaped output terminal 3 are insulated and insulated, and the connection is ensured, thereby solving the problem of insulation. On the other hand, in this case, there is a problem in securing a filling gap of the sealant 6 between the ignition transformer 5 and the connection step 30, but an intrusion groove 35 of the sealant 6 is formed on the inner surface of the connection step 30. Since it is formed, a sufficient filling gap of the sealant 6 is secured between the ignition transformer 5 and the connection step 30 by the intrusion groove 35, and the heat generated from the ignition transformer 5 is cut off by the sealant 6. Is done.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a discharge booster will be described with reference to the accompanying drawings. 1 to 4, a large number of insertion holes 2 are provided in a row on the upper surface of one side of a transformer case 1 which is substantially rectangular and whose lower surface is open.
The needle-shaped output terminals 3 to which are fitted are respectively implanted in the connection steps 30 of the transformer case 1. The high-pressure cord 50
A large number of insertion holes 2 into which are inserted, for example, are provided so as to be applicable to a combustion apparatus having a plurality of gas burners.

As shown in FIG. 1, a circuit case 40 for mounting a circuit member is provided on the other side surface of the transformer case 1. The circuit housing 40 includes a capacitor, a resistor,
A circuit board or the like on which a silicon control rectifier and the like are mounted is mounted. The primary side input / output terminals 41 protrude from the terminal holes of the circuit housing 30.

In addition, mounting pieces 19, 19 having through holes are provided on the front and rear sides of the lower portion of the main body case 1, and bolts are screwed through the through holes and fixed at appropriate places.

An ignition transformer 5 is housed in the transformer case 1. As shown in FIG. 5, the ignition transformer 5 has an iron core 21 inserted through the center of a primary bobbin 20 of the ignition transformer 5 and a primary coil 22 wound around the center thereof. Are connected to the lead wires 7,7. The secondary bobbin 24 is fitted on the primary bobbin 20. The secondary bobbin 24 is formed with a plurality of divided circumferential grooves 26, and a thin metal wire is continuously wound between these divided circumferential grooves 26, and three independent secondary coils 25, 25 are formed. , 25 are formed, and a pair of input / output side connection pins 27, 28 are erected on both sides of the coil winding portion of each secondary coil 25, 25, 25, respectively.

A printed circuit board 8 is provided in the lower surface opening of the transformer case 1, and connection pins 27 arranged in a cascade on one side of the ignition transformer 5 are provided in four through holes 11 a formed in the printed circuit board 8. , 28 are inserted. Similarly, the rear end of the needle-shaped output terminal 3 is also inserted into the semicircular through hole 11b formed at the edge of the printed circuit board 8, and the conductive path 10a
10d to 10d. As a result, the connection pins 27 and 28 and the needle-shaped output terminals 3 are electrically connected to each other via the conductive paths 10a to 10d on the printed circuit board 8 without requiring a lead wire.

The transformer case 1 is filled with an insulating sealant 6, and the ignition transformer 5 and the printed circuit board 8 are embedded in the sealant 6. Incidentally, circular injection holes 9, 9 are formed at two places on the left and right sides of the printed board 8 so that the sealing agent 6 is filled in the transformer case 1. The lead wires 7 for supplying power to the input end of the ignition transformer 5 are inserted through the through holes 12 c formed in the printed circuit board 8 and are drawn out of the sealant 6. The sealant 6 fixes the ignition transformer 5 and cuts off the heat generated therefrom so as not to affect the electric circuit section 16 having a heat-sensitive component such as a rectifying element to be described later. Things.

The present embodiment has the above-described basic configuration. A required high-voltage cord 50 is externally fitted to the needle-like output terminal 3 from the insertion hole 2 and is connected to the primary-side input / output terminals 41 via appropriate switches. AC power supply is connected. The switch is configured to be closed by, for example, opening a knob of a gas appliance. When power is supplied to the electric circuit section by closing the switch, the current is rectified by a rectifying element or the like and charge is accumulated in a capacitor, and a current flows from the capacitor to the primary coil 22 of the ignition transformer 5, and each secondary coil The high voltage generated from 25, 25 is taken out from the output terminal 3 by the high voltage cord 50, and an ignition spark is generated at the discharge electrode.

Next, the main part of the present invention will be described. On the lower surface of the connection step 30 of the transformer case 1 in which the needle-shaped output terminals 3 are implanted, a plurality of partitioning protruding plates 31 are formed downward between the needle-shaped output terminals 3. On the other hand, in the printed circuit board 8, the linking long grooves 34a-34 into which the partitioning protruding plates 31 are fitted.
c is formed linearly from the edge to the back. The linking long grooves 34a to 34c are formed so as to be discontinuous with the injection holes 9, 9, and the central linking long groove 3 between the injection holes 9, 9 is formed.
Only 4b has a slightly longer dimension. Thus, the conductive paths 1 located on both sides of the linking long grooves 34a to 34c
0a to 10d are insulated from each other.

On the other hand, in order to make the partitioning protruding plate 31 as long as possible and to secure a sufficient space for filling the sealant 6 between the ignition transformer 5 and the connecting step portion 30, FIGS. As shown, on the inner surface of the connecting step portion 30 between the partitioning projecting plates 31,
A penetration groove 35 for the sealant 6 is formed.

In addition, a plurality of plate edges 38 having arc-shaped edges are formed on the inner top surface of the transformer case 1 on both sides of the ignition transformer 5 at positions corresponding to the respective divided circumferential grooves 26. The internal volume is reduced by 38, and the filling amount of the sealant 6 is reduced.

In the above structure, the linking long grooves 34a to 34a-3
4c is formed so as to be discontinuous with the injection holes 9, 9. Therefore, the wide slot is not formed so as to cross the substrate, and the strength of the printed circuit board 8 is improved by the plate portion between the linking long grooves 34a to 34c and the injection holes 9, 9. When the ignition transformer 5 is mounted on the printed circuit board 8 or mounted on the transformer case 1 with the ignition transformer 5 mounted, stress is applied to the printed circuit board 8 to cause breakage or cracking. Hateful. In addition, when the linking long grooves 34a to 34c and the injection holes 9 and 9 are discontinuous, the creepage distance is reduced only by the linking long grooves 34a to 34c, but the linking long grooves 34a to 3c are shortened.
4c, the conductive paths 10a to 10d on the printed circuit board connected to the needle-like output terminals 3 are insulated by the partitioning protruding plate 31 so as to be insulated.
The insulation can be secured. Further, an intrusion groove 35 for the sealant 6 is formed on the inner surface of the connection step 30, and a sufficient filling gap of the sealant 6 is provided between the ignition transformer 5 and the connection step 30 by the intrusion groove 35. Therefore, the heat generated from the ignition transformer 5 is cut off, and the heat insulation is ensured.

[0024]

According to the present invention, the partitioning projecting plate is formed on the step surface of the transformer case where the needle-like output terminals are implanted, between the respective needle-like output terminals, and the projecting plate is fitted into the printed circuit board. The linking long groove is formed inward from the edge so as to be discontinuous with the injection hole, and a groove for insulative sealing agent is formed between the partitioning protruding plates on the inner surface of the connection step. Therefore, the linking long groove and the injection hole are partitioned by the substrate, and a deep groove is not continuously formed in the printed circuit board, so that the substrate strength is improved. In addition, an intrusion groove for the sealant is formed on the inner surface of the connection step between the partitioning projecting plates, and the intrusion groove secures a sufficient filling gap of the sealant between the ignition transformer and the connection step. Therefore, heat insulation and insulation of the ignition transformer are ensured. Thus, the present invention has excellent effects such as high strength of the printed circuit board, securing insulation, and sufficient heat insulation.

[Brief description of the drawings]

FIG. 1 is a plan view of a discharge booster of the present invention.

FIG. 2 is an exploded perspective view of the ignition transformer 5 of the present invention and the printed circuit board 8 as viewed from below.

FIG. 3 is a vertical sectional side view of a main part of the discharge booster of the present invention.

FIG. 4 is a bottom view of a part of the discharge booster of the present invention, showing the relationship between the partitioning protruding plate 31 and the linking long grooves 34a to 34c separately.

FIG. 5 is a partially cutaway plan view of the ignition transformer 5;

FIG. 6 is a vertical sectional side view of a discharge booster having a conventional configuration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transformer case 3 Needle-like output terminal 5 Ignition transformer 6 Sealant 9 Injection hole 30 Connection step part 31 Partitioning protruding plate 34a-34c Linking long groove 35 Entry groove

Claims (1)

[Claims] 1. A printed circuit board is provided at an opening on a lower surface of a transformer case for housing an ignition transformer, and a connection pin for connecting to a secondary coil is projected from a secondary bobbin of the ignition transformer. Along with being inserted into the through hole of the printed circuit board, a needle-shaped output terminal is inserted into each of the insertion holes and held in a connection step formed on one side of the transformer case and provided with a plurality of high-voltage cord insertion holes, The lower end of the needle-shaped output terminal was inserted into a through hole of a printed circuit board, and the connection pin and the needle-shaped output terminal were electrically connected to each other via a conductive path formed on the printed circuit board. In a booster device configured to fill an insulating sealant into a transformer case from an injection hole, the connection step portion has a step surface formed on a step surface thereof to project each needle-like output terminal downward, and The On the lint board, a linking long groove extending inward from the edge into which the partitioning protruding plate is fitted is disposed so as to be discontinuous with the injection hole, and further on the inner surface of the connection step portion, at a position between each partitioning protruding plate, A step-up device having an insulating groove formed therein.