JPS60142117A - Discharge ignition device of gas appliance - Google Patents

Abstract

PURPOSE:To obtain the small-sized and safe discharge ignition device of a gas appliance by a construction wherein input and output terminals are incorporated in a terminal board and made to pierce therethrough, the terminal board is joined to an insulating case, and either the insulating case or the terminal board is provided with a partition separating and insulating two printed boards from each other. CONSTITUTION:Two printed boards 47 and 48 are connected electrically by a double-core parallel wire 49. A high-voltage transformer 19 having an output terminal 22, capacitors 5, 6, 7 and 18, a diode 13 and input terminals 1 and 2 are incorporated in one printed board 47, and a high-voltage transformer 20 having an output terminal 23, an oscillating transformer 8, a transistor 10, diodes 11, 12 and 21, a thyristor 14, a thermistor 17, an earth metal fitting 25, etc. are incorporated in the other printed board 48, whereby a circuit unit is constructed. This circuit unit is incorporated in a terminal board 50, on one surface of which insulating tubes 51 and 52 for leading out the output terminals 22 and 23 and boss members 53 and 54 for leading out the input terminals 1 and 2 are provided, and on the other surface of which a partition 55 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a discharge ignition device for gas appliances used for gas ignition.

Conventional configurations and their problems Piezoelectric igniters have traditionally been the mainstream igniter for gas appliances, but in recent years, electronic circuit-based high-voltage spark-type discharge igniters have become popular at a remarkable pace. There is.

In particular, gas appliances that have two hot water supply and heating circuits, or two hot water supply circuits for bath and shower, that is, two ignition devices, use electronic circuit type high-voltage spark type discharges that are easy to sequence control due to the spread of microcontrollers. Ignition devices have come to be primarily used.

The electronic circuit type high-voltage spark type discharge ignition device used in gas appliances with two burners, which are often microcomputer-controlled, as described above, must supply high voltage output to two sets of discharge electrodes, but one high-voltage When the output is connected to two sets of discharge electrodes, it is difficult to spark the two sets of discharge electrodes at the same time, so two high-voltage transformers are used.

FIG. 1 is a circuit diagram of an example of a discharge ignition device for a gas appliance configured to use two such high-voltage transformers. A noise filter composed of resistors 3, 4 and capacitors 5, 6.7 is connected to the input terminals 1, 2, and an oscillation transformer 8. Resistance9. transistor 1
0. Diode 11. Protection diode 12, +1
3, a thyristor 14 is connected to the output side of the ringing choke converter, and resistors 15, 16 . The thyristor 14 is triggered by a trigger circuit consisting of a thermistor 17,
The electric charge charged in the capacitor 18 connected to the output side of the oscillation transformer 8 flows as an oscillating current through the high voltage transformers 19 and 20, the thyristor 14, and the diode 21, and the output terminals 22 and 23 of the high voltage transformers 19 and 20 flow.
MVl.

A high voltage pulse of Hv2 is generated. This high voltage pulse HV,
, HV2 are guided to the discharge electrode and generate sparks.

A discharge ignition device using two such high-voltage transformers has conventionally been constructed as shown in FIGS. 2 to 7. 1. In FIGS. 2A and 2B, 24 is a printed circuit board, and the high voltage transformer 1 is installed on this printed circuit board 24.
9, 20, oscillation transformer 8. Diodes 11-13
,21. Capacitors 5, 6, 7.18. ) range meta 1
0. Thyristor 14. Thermistor 17 and input terminal 1
, 2° output terminals 22 , 23 , and a grounding fitting 26 are incorporated to form a circuit unit.

Such a circuit unit is assembled into an insulating case 26 shown in FIGS. 3A to 3D. This insulating case 26 has a front plate 27
and a bottom plate 28, and a high voltage terminal 2 is installed on the front plate 27.
2. Insulating cylinder 29°3o that pulls out 23 and input terminals 1 and 2
Elongated holes 31 and 32 are provided for drawing out the front plate 27, engaging pieces 33 are provided on both sides of the front plate 27, and mounting pieces 34 are provided on both sides of the bottom plate 27.

FIG. 4 shows a state in which the circuit unit is assembled into such an insulating case 26. This is then covered with an insulating cover 35 shown in FIGS. 5A-D.

This insulating cover 36 is composed of a top plate 36, a back plate 37, and both side plates 38, 39, and these side plates 3B, 3B,
39 is provided with an engagement hole 40 that engages with the engagement piece 33 of the insulating case 26. FIG. 6 shows what is covered with this insulating cover 36.

The advantage of such a structure is that the input terminals 1.2 can be directly attached to the printed circuit board 24, and the high voltage transformer 19.20 having the output terminals 22.23 can also be directly assembled to the printed circuit board 24 using the primary terminals. 1, 2 and output terminal 22
．． Since the wire 23 is configured to pass through the insulating case 26, there is no need to use lead wires, resulting in excellent assembly workability.

However, the voltage waveforms on the output side of the high voltage transformers 19 and 20 differ in shape and phase. That is, high voltage transformer 19.2
Since the vibration conditions differ depending on the primary inductance of 0, the ends where the output terminals 22 and 23 are provided are at the same height between the two high voltage transformers 19° and 20, and the ends where the potential difference is the largest are at the same height. Put it away. Therefore, to ensure reliable insulation, two high voltage transformers 19.20
This had the disadvantage that the distance between the lines had to be increased, making the whole structure larger. In order to miniaturize this, the two high-voltage transformers 19 and 20 had to be insulated completely without bubbles by vacuum injection of insulating resin, which increased manufacturing costs. In the gas appliances installed, the entire discharge ignition device had to be covered with plastic to prevent rainwater, which was a significant disadvantage in terms of cost.

In order to eliminate the above-mentioned drawbacks, FIG.

As shown in B, the two high-voltage transformers 19 and 20 are separated from the printed circuit board 24 using an insulating case 44 that has two storage sections 42 and 43 with a partition wall 41, and a printed circuit board incorporating various electronic components. The circuit unit consisting of 24 is placed in one storage section 42, and the two high voltage transformers 19 and 20 are placed in one storage section 42.
The circuit unit and the high-voltage transformer 19.degree. 20 were housed in the other storage section 43 with the highest potential side located at the farthest position from each other, and the circuit unit and the high voltage transformer 19.degree. 20 were connected by a plurality of lead wires 46.

However, in this configuration, connections must be made using a large number of lead wires 45, and it is difficult to directly take out the output terminals 22 and 23 of the two high voltage transformers 19 and 20 arranged as described above. Since the output terminals 22 and 22 are different from each other, it is impossible to
．． 23 to 1 gland 46, there were problems in that the wiring required time and effort and the material cost was high.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and provides a discharge ignition device for gas appliances that is small and safe, with the number of lead wires minimized.

Structure of the Invention In order to achieve the above object, the discharge ignition device for gas appliances of the present invention includes two high-voltage transformers installed separately on two printed circuit boards together with electronic components constituting other circuits. In addition to electrically connecting, an input terminal is provided on the printed circuit board, an output terminal is provided on each of the high voltage transformers, and the input/output terminals are incorporated into a terminal board and passed through, and this terminal board forms one side of the insulating case. The insulating case or terminal board is provided with a partition wall for separating and insulating the two printed circuit boards. Since the two printed circuit boards are assembled through the partition wall, there is no need for special insulation or insulation treatment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 8 to 12 of the drawings.

Note that parts that are the same as those described in the conventional example will be described using the same reference numbers.

First, as shown in FIGS. 8A and 8B, two printed circuit boards 47 and 48 are electrically connected by a multi-core parallel electric wire 49, and one of the printed circuit boards 47 has a high voltage transformer 19 having an output terminal 22. ．． Capacitor 5.8, 7.18. Diode 13. A high-voltage transformer 209 incorporating an input terminal 1.2 and having an output terminal 23 on the other printed circuit board 48; an oscillation transformer 8I transistor 10. Diode 11. 12
, 21.

Thyristor 14. Thermistor 17. A grounding fitting 25 and the like are incorporated to form a circuit unit.

Such a circuit unit is assembled into a terminal board 6o shown in FIGS. 9A-D. This terminal board 50 includes an insulating tube 51.52 from which the output terminal 22.23 is drawn out, an input terminal 1,
The boss portions E53 and 54 for pulling out 2 are provided on one side, and the partition wall 56 is provided on the other side.

As shown in FIG.
9 as a hinge, the input terminals 1 and 2 are inserted into the boss portions 53 and 54, the output terminal 22 is inserted into the insulating cylinder 61, and the output terminal 23 is inserted into the insulating cylinder 62 and fixed.

The thus assembled product is assembled into an insulating case 66 shown in FIGS. 11A to 11D. The insulating case 56 has an open front and top surface, and a coupling groove 57 is formed in the front surface to fit the terminal plate 5o, and mounting portions 5 are formed in the upper portions of both sides.
8 is provided.

The state in which the terminal board 60 is assembled into the insulating case 56 is the first state.
This is Figure 2. At this time, the tip of the grounding metal fitting 25 is located at one mounting portion 68 of the insulating case 66, so that it is grounded to the chassis when it is incorporated into an electronic device or the like.

With such a configuration, if necessary, an insulating material is filled under normal pressure to ensure overall integration and disconnection.

Effects of the Invention Since the discharge ignition device for gas appliances of the present invention is configured as described above, the two high-voltage transformers can be directly incorporated into the printed circuit board, and the lead wire can be connected to a multi-core wire by simply connecting the two printed circuit boards. It can be processed at once using parallel electric wires, etc.
Moreover, since the output terminals of the high-voltage transformer are separated by the partition wall, sufficient insulation distance can be maintained, and the package can be made compact. Filling with insulating material does not require special vacuum impregnation, which is advantageous in terms of manufacturing costs. It is a dog of industrial value, with advantages such as the ability to

[Brief explanation of the drawing]

Figure 1 is an electrical circuit diagram of a discharge ignition device for gas appliances;
Figures A and B are a plan view and a side view of the circuit unit of a conventional discharge ignition device, Figures 3A-D are a plan view, front view, side view, and bottom view of an insulating case used in the same device, and Figure 4 is a Side view of the circuit unit assembled into the insulation case, Figures 5A-D
6 is a side view of the same device, FIGS. 7A and B are a plan view and front view of another conventional example, and FIG. 8A and 8B are a plan view and a front view of a circuit unit showing one embodiment of the discharge ignition device for gas appliances of the present invention, and FIGS. 9A to 9D are a plan view and a front view of a terminal board used in the device, A side view and a bottom view, Fig. 10 is a plan view of the circuit unit y) assembled into the terminal board, Figs. 11A-D are a plan view and a front view of the insulating case used in the device,
A side view, a bottom view, and FIG. 12 are plan views of the device assembled in the insulating case. 1.2...Input terminal, 3, 4, 9, 15.16.
...Resistor, 15,6,7.18...Capacitor, 8...Oscillating transformer, 1o...River transistor, 11゜12.13.21... ...Diode, 14...Thyristor, 17...
Thermistor, 19.20... High voltage transformer, 2
2.23...Output terminal, 25...Grounding fitting, 47, 48...Printed circuit board, 49
...Parallel electric wire, 60...Terminal board, 51
．． 62...Insulating cylinder, 53, 54...
Boss portion, 65...Partition wall, 56...Insulation case, 67...Joining groove, 58...Mounting portion. Name of agent: Patent attorney Toshio Nakao and 1 other person
4 Figure 5 (B) Figure 6 Figure 7? 5 Figure 9 (Hasho Figure 10)

Claims (1)

[Claims] Two high-voltage transformers are installed separately on two printed circuit boards together with other electronic components constituting the circuit, and the two printed circuit boards are electrically connected, and an input terminal is provided on the printed circuit board to connect each of the high-voltage transformers. An output terminal is provided, this input/output terminal is assembled into a terminal board and passed through it, this terminal board is combined to form one surface of an insulating case, and the above two printed circuit boards are separated and insulated on this insulating case or terminal board. A discharge ignition device for gas appliances, which is provided with a partition wall.