JPH0222853B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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.

Especially hot water supply and heating, or bath and shower.
With the spread of microcomputers, gas appliances with two burners, ie, two ignition devices, such as hot water supply circuits, have come to primarily utilize electronic circuit type high-voltage spark type discharge ignition devices that are easy to sequence control.

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 connected to two sets of discharge electrodes from the output, 2
Because it is difficult to spark a set of discharge electrodes at the same time, 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 consisting of resistors 3, 4 and capacitors 5, 6, 7 is connected to input terminals 1 and 2, and through this noise filter, an oscillation transformer 8, a resistor 9, a transistor 10, a diode 11, and a protective A ringing chain converter consisting of diodes 12 and 13 is connected, a thyristor 14 is connected to the output side of the ringing chain converter, resistors 15 and 16, and 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 high voltage transformer HV ₁ to the output terminals 22 and 23 of 19 and 20,
A high voltage pulse of HV ₂ occurs. This high pressure pulse
HV ₁ and HV ₂ 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. First, in FIGS. 2A and 2B, 24 is a printed circuit board, and this printed circuit board 24 includes high voltage transformers 19, 20, oscillation transformer 8, diodes 11 to 13, 21, capacitors 5, 6, 7, 18, and transistors. 10, thyristor 14, thermistor 17 and input terminal 1,
2. Output terminals 22, 23 and a grounding fitting 25 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 insulation case 2
6 is composed of a front plate 27 and a bottom plate 28, and the front plate 27 has an insulating tube 2 from which high voltage terminals 22 and 23 are drawn out.
9, 30, and a long hole 31 for pulling out the input terminals 1, 2.
32, 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. Then, this is covered with an insulating cover 35 shown in FIGS. 5A to 5D.
This insulating cover 35 is composed of a top plate 36, a back plate 37, and both side plates 38, 39.
An engagement hole 40 that engages with is provided. FIG. 6 shows what is covered with this insulating cover 35.

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 output terminal 2
The high-voltage transformers 19 and 20 having the transformers 2 and 23 can also be directly incorporated into the printed circuit board 24 using the primary terminals. There is no need to use wires, and assembly workability can be improved.

However, the voltage waveforms on the output side of the high voltage transformers 19 and 20 differ in shape and phase. That is, since the vibration conditions differ depending on the primary inductance of the high voltage transformers 19 and 20, there are two high voltage transformers 19 and 20 between the ends where the output terminals 22 and 23 are provided.
Between 20 and 20, the ends with the largest potential difference end up at the same height. Therefore, in order to ensure reliable insulation, two high voltage transformers 19 and 20 are required.
The disadvantage was that the distance between the lines had to be increased, and the overall size had to be increased. In order to miniaturize this, the two high-voltage transformers 19 and 20 must be insulated completely without bubbles by vacuum injection of insulating resin, which increases manufacturing costs.

Furthermore, in gas appliances installed outdoors, the entire discharge ignition device must be covered with an insulating resin to prevent rainwater, which is extremely disadvantageous in terms of cost.

In order to eliminate the above-mentioned drawbacks, Fig. 7A,
As shown in B, the two high voltage transformers 19 and 20 are separated from the printed circuit board 24 and separated by a partition wall
A printed circuit board 24 incorporating various electronic components using an insulating case 44 having two storage sections 42 and 43.
Two circuit units are placed in one storage section 42.
The two high-voltage transformers 19 and 20 are housed in the other housing part 43 with the highest potential side at the farthest position from each other, and the circuit unit and the high-voltage transformer 1 are housed in the other housing part 43.
9 and 20 are connected by a plurality of lead wires 45.

However, in this configuration, connection must be made using a large number of lead wires 45, and it is difficult to take out the output terminals 22, 23 of the two high voltage transformers 19, 20 arranged as described above directly to the outside. This becomes impossible because the output terminals 22 and 23 are installed in advance in the insulating case 44, and the lead wires 46 have to be connected to the output terminals 22 and 23, which requires time and effort for wiring and increases material costs. Ta.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the conventional technology, and reduces the number of lead wires as much as possible.
The present invention provides a small and safe discharge ignition device for gas appliances.

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 using multi-core parallel wires, an input terminal is provided on the printed circuit board, and an output terminal is provided on each of the high voltage transformers. A partition wall that separates and insulates the printed circuit boards is placed between the two printed circuit boards, and the input/output terminals are incorporated into and passed through a terminal board that is integrated with the partition wall, and the terminal board is inserted into the terminal board. They are combined to form one side of the insulating case, and this configuration significantly reduces the number of lead wires for connection wiring, and the two printed circuit boards are assembled with a partition between them. , it is also possible to eliminate the 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. , a high voltage transformer 20 incorporating capacitors 5, 6, 7, 18, a diode 13, input terminals 1, 2, and having an output terminal 23 on the other printed circuit board 48, an oscillation transformer 8, a transistor 10, and diodes 11, 1.
2, 21, a thyristor 14, a thermistor 17, a grounding fitting 25, etc. are incorporated to form a circuit unit.

Such a circuit unit is assembled into a terminal board 50 shown in FIGS. 9A to 9D. This terminal board 50
is an insulating tube 5 from which the output terminals 22 and 23 are drawn out.
1, 52, and a boss portion 5 that pulls out the input terminals 1, 2.
3 and 54 are provided on one side, and a partition wall 55 is provided on the other end.

As shown in FIG.
8 are made to face each other in a flat manner using a parallel electric wire 49 as a hinge, and 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 51, and the output terminal 23 is inserted into the insulating cylinder 52 and fixed.

The thus assembled product is assembled into an insulating case 56 shown in FIGS. 11A to 11D. This insulation case 56
The front and top surfaces are open, and a coupling groove 57 is formed in the front surface so as to fit the terminal board 50 therein, and mounting portions 58 are provided in the upper portions of both sides. FIG. 12 shows a state in which the terminal plate 50 is assembled into this insulating case 56. At this time, earth fitting 2
The tip of 5 is located at one mounting portion 58 of the insulating case 56, and is grounded to the chassis when incorporated into an electronic device or the like.

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

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 is a multi-core parallel electric wire between the two printed circuit boards. It can be processed all at once by simply connecting it, and it is a simple process to use the parallel wires as a hinge to make the two printed circuit boards face each other parallel to each other with a partition between them. As a result, the two high-voltage transformers naturally have the maximum insulation distance and are reliably separated and insulated by the partition wall, so they can be used for outdoor rainwater protection without special insulation treatment using insulating resin. It has great industrial value because it has the advantage of ensuring good insulation performance, minimizing the overall size, and being advantageous in terms of manufacturing costs.

[Brief explanation of drawings]

Figure 1 is an electrical circuit diagram of a discharge ignition device for gas appliances, Figures 2A and B are plan and side views of the circuit unit of a conventional discharge ignition device, and Figures 3A to D are insulation used in the device. A plan view, a front view, a side view, and a bottom view of the case. Fig. 4 is a side view of the circuit unit assembled into the insulating case. Fig. 5 A to D are a plan view and front view of the insulating cover used in the device. Fig. 6 is a side view of the same device, Fig. 7 A, B is a plan view and front view showing another conventional example, Fig. 8 A, B is a gas appliance of the present invention. A plan view and a front view of a circuit unit showing one embodiment of a discharge ignition device, FIGS. 9A to 9D
10 is a plan view of the terminal board used in the same device, a front view, a side view, and a bottom view. FIG. 10 is a plan view of the circuit unit assembled into the terminal board. FIGS. A plan view, a front view, a side view and a bottom view of the case, and FIG. 12 is a plan view of the case assembled into the insulating case. 1, 2...Input terminal, 3, 4, 9, 15, 16
...Resistance, 5, 6, 7, 18 ... Capacitor, 8
...Oscillation transformer, 10...Transistor, 1
1, 12, 13, 21...diode, 14...
Thyristor, 17... Thermistor, 19, 20...
...High voltage transformer, 22, 23...Output terminal, 25
...Earth metal fitting, 47,48...Printed circuit board,
49... Parallel electric wire, 50... Terminal board, 51, 52
...Insulating tube, 53, 54...Boss portion, 55...Partition wall, 56...Insulating case, 57...Joining groove, 58
...Mounting part.

Claims (1)

[Claims] 1. Two high-voltage transformers are installed separately on two printed circuit boards together with electronic components that make up other circuits, and the two printed circuit boards are electrically connected using multi-core parallel wires, and An input terminal is provided, each of the high voltage transformers is provided with an output terminal, the two printed circuit boards are opposed to each other in substantially parallel, and a partition wall for separating and insulating the two printed circuit boards is located between the two printed circuit boards. A discharge ignition device for a gas appliance, wherein the input/output terminal is incorporated into and penetrates a terminal board which is disposed in a terminal board and which is integrated with a partition wall of the terminal board, and the terminal board is coupled to form one surface of an insulating case.