JP2006090623A - High voltage generating device for electric discharge ignition device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high voltage generating device for an electric discharge ignition device capable of preventing leakage of a mold material from an electrode terminal mounting part. <P>SOLUTION: Stepped insertion holes 47, 46, 45 are formed on an outer housing 2 of this high voltage generating device 1 for the electric discharge ignition device in a state that opening areas are gradually reduced from an outer side. A taper part 44 of an output-side terminal 40 is press-fitted in the insertion hole 45 of the smallest opening area from the outer side, and the whole output-side terminal 40 is supported by the outer housing 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high voltage generator for a discharge ignition device used in various combustion appliances such as gas combustion appliances and petroleum combustion appliances.

  In various combustion appliances such as a gas stove and a water heater, a discharge ignition device is used as an ignition source. As a discharge ignition device, a device is generally used that combines a high voltage generation device including an ignition transformer that boosts a power supply voltage to a predetermined high voltage and an ignition plug installed in the vicinity of a gas burner or the like. In such a discharge ignition device, a gas burner or the like is ignited by generating a spark from the discharge electrode of the spark plug by the secondary side voltage boosted by the ignition transformer of the high voltage generator.

As the above high voltage generator, an ignition transformer and a circuit unit on which electronic components are mounted are housed in a case (external housing) made of an insulating material and filled with an insulating mold material such as resin. The thing of the structure which is made is known. In such a high voltage generator, it is necessary to provide electrode terminals such as an electrode terminal for connecting a power source to the high voltage generator and an electrode terminal for connecting the high voltage generator and the spark plug. For this reason, it is known that a hole is provided in the external housing, and a metal piece for electrode terminals is inserted and disposed in this hole so as to protrude from the inside of the external housing (for example, a patent) Reference 1).
International Publication No. 00/07217

  As described above, the high voltage generator for a discharge ignition device is configured by accommodating a circuit unit on which an ignition transformer and electronic components are mounted in an external housing and filling an insulating mold material. Thus, the reason why the insulating mold material is filled in the external housing is to ensure the insulation from the relationship of generating a high voltage.

  However, in the high voltage generator for a discharge ignition device, a hole for leading the electrode terminal to the outside must be provided in the external housing. For this reason, the molding material may leak from the hole, and there is a problem that it is difficult to fill the molding material in a good state in the external housing without causing the leakage of the molding material.

  The present invention has been made to address such problems. The present invention provides a high voltage generator for a discharge ignition device that can prevent leakage of a molding material from an electrode terminal mounting portion and can fill the outer casing with the molding material in a good state. It is an object.

(Claim 1)
A high voltage generator for a discharge ignition device according to the present invention is a high voltage generator for a discharge ignition device that generates a spark discharge by supplying a high voltage to an ignition plug and ignites fuel. An ignition transformer configured to insert a magnetic core wound with a primary winding into a central hole of the cylindrical coil bobbin, which boosts a power supply voltage, a circuit unit on which electronic components are mounted, the ignition transformer, and the An external housing that houses a circuit unit and is filled with a molding material, and has an outer housing formed with a stepped insertion hole that gradually decreases in opening area from the outside, and the external housing And an electrode terminal that is inserted into the insertion hole from the outside and has a distal end portion electrically connected to the circuit unit.

  In the high voltage generator for a discharge ignition device according to the present invention, an insertion hole having a stepped shape in which the opening area gradually decreases from the outside is formed in the external housing, and the electrode terminal is formed in the insertion hole from the outside of the external housing. Is inserted. For this reason, since the opening area of the insertion hole is relatively narrow and is closed from the outside by the electrode terminal inserted from the outside, it is possible to prevent the leakage of the molding material. And the molding material can be filled in a good state in the external housing.

(Claims 2 and 3)
One aspect of the high voltage generator for a discharge ignition device according to the present invention is characterized in that the electrode terminal is formed with a stepped portion that gradually increases in width from the insertion side in accordance with the stepped insertion hole.
In one aspect of the high voltage generator for a discharge ignition device according to the present invention, the electrode terminal is formed with a tapered portion that is press-fitted into a portion of the insertion hole having the smallest opening area. . This can more reliably prevent the mold material from leaking from the insertion hole.

(Claim 4)
One aspect of the high voltage generator for a discharge ignition device of the present invention is characterized in that the tip of the electrode terminal is soldered to a land provided in the circuit unit. Accordingly, the electrode terminal can be fixed in a state where the insertion hole is closed from the outside by the electrode terminal inserted from the outside, and the leakage of the molding material can be more reliably prevented.

  According to the high voltage generator for a discharge ignition device of the present invention, the leakage of the molding material from the electrode terminal mounting portion can be prevented, and the outer housing can be filled with the molding material in a good state.

Hereinafter, modes for carrying out the present invention will be described.
1 and 2 show a main configuration of a high voltage generator for a discharge ignition device according to an embodiment of the present invention. In these drawings, reference numeral 1 denotes a high voltage generator for a discharge ignition device, and the discharge ignition device is configured by connecting the high voltage generator 1 for a discharge ignition device and an ignition plug (not shown). The discharge ignition device is used for various combustion appliances such as a gas combustion appliance such as a gas stove and a gas water heater, and an oil combustion appliance such as an oil water heater and an oil fan heater.

  A high voltage generator 1 for a discharge ignition device has an external housing 2 made of an insulating material (resin in the present embodiment). The material constituting the outer casing 2 is a resin having heat resistance, such as POM (polyoxymethylene), PBA (polybutyl acrylate), PBS (polybutadiene styrene), PBT (polybutylene terephthalate), PPS (polyphenylene). Sulfild) and the like can be used.

  In the external housing 2, an ignition transformer 3 and a circuit unit 4 in which electronic components such as a diode, a resistor, and a capacitor are mounted on a printed board are housed. As shown in FIG. 2, the circuit unit 4 includes output terminals 40 (and input terminals 61 and 62 (not shown in FIG. 2)), which will be described later, inserted from the lower side of the external housing 2. The tip is soldered and electrically connected. FIG. 2 shows a state where the circuit unit 4 and the ignition transformer 3 are separated in order to make the internal structure easy to see, but these are soldered. Although not shown, a molding material such as urethane resin is enclosed in the external housing 2.

  The ignition transformer 3 inserts a magnetic core 6 such as an iron core around which a primary coil (primary side winding) is wound into a central hole of a cylindrical coil bobbin 7 around which a secondary coil (secondary side winding) is wound. It is constituted by. A plurality of (four in the present embodiment) terminal arrangement portions 8 are formed on the side portions of the cylindrical coil bobbin 7 so as to protrude sideways, and output pins 9 as connection terminals are formed on the terminal arrangement portions 8. Has been planted. The end portions of the secondary windings are wound around these output pins 9 and soldered.

  As shown in FIGS. 1 and 2, the external housing 2 has an opening 10 on one side (upper side in the drawing), and an ignition transformer 3 is inserted through the opening 10. And the support part 11 which contact | abuts and supports the lower side of the coil bobbin 7 of the ignition transformer 3 inserted from the opening part 10 is comprised planarly. In this way, the cylindrical coil bobbin 7 is not supported by the same cylindrical support part, but is supported by the planar support part 11, so that an appropriate amount is provided between the coil bobbin 7 and the inner surface of the external housing 2. An interval can be provided. This makes it possible to easily and reliably fill the molding material made of resin or the like between the coil bobbin 7 and the inner wall of the external housing 2. Further, it is possible to prevent bubbles from being mixed into the mold material when the mold material is filled.

  As shown in FIG. 1, a curved portion 12 that matches the shape of the cylindrical coil bobbin 7 is formed on the side wall portion of the portion of the external housing 2 in which the ignition transformer 3 is accommodated. The joint portion 13 between the support portion 11 and the support portion 11 is formed substantially vertically (straight), and the cross-sectional shape thereof is a bottleneck shape.

  On the other hand, contact portions 14 are provided in the vicinity of both end portions in the longitudinal direction of the coil bobbin 7. These abutting portions 14 are formed of a plate-like body provided so as to protrude from the coil bobbin 7, the tip portion thereof is a linear shape corresponding to the shape of the support portion 11, and the side portion thereof is connected to the joint portion 13. It has a corresponding linear shape. That is, these contact portions 14 have a shape corresponding to the inner shape of the outer casing 2 that extends from the curved portion 12, which has a bottleneck shape, to the support portion 11 through the joint portion 13. These contact portions 14 are inserted between the joint portions 13 and contacted with the support portion 11, so that the coil bobbin 7 (ignition transformer 3) is positioned at a predetermined position in the external housing 2. It has become. Moreover, the space | interval formed between the support part 11 and the coil bobbin 7 by the contact part 14 can be set to the space | interval which is easy to fill with a molding material.

  In the present embodiment, the outer portion 15 of the external housing 2 corresponding to the support portion 11 is also formed in a planar shape, like the support portion 11. Thus, by making the shape of the outer portion 15 the same as that of the inner support portion 11, it is possible to make it difficult for resin sinks or the like to occur when the outer casing 2 is manufactured.

  Moreover, as shown in FIG. 1, the terminal arrangement | positioning part 8 mentioned above is provided so that it may protrude from the side part of the coil bobbin 7, and the outer surface 16 is each formed in planar shape. When the ignition transformer 3 is inserted into the outer casing 2, the planar outer surface 16 comes into contact with the inner wall of the outer casing 2 so that the ignition transformer 3 is guided to a predetermined position. ing.

  Furthermore, as shown in FIG. 1, the inner side part 17 of the output pin 9 planting surface of the terminal arrangement part 8 has a chamfered shape. As a result, when the secondary winding is mechanically wound around the output pin 9, the winding device and the inner portion 17 are unlikely to interfere with each other.

  As shown in FIG. 3, the circuit unit 4 is provided with two input terminal mounting lands 20 and 21 and four output terminal mounting lands 22, 23, 24, and 25. These lands have a shape in which a cutout portion is provided in a part of the conductor pattern. The direction of the notch is aligned with a predetermined direction (left side in FIG. 3), and the shape of the conductor pattern is substantially C-shaped.

  The reason why the land has such a shape is that when the electronic component and the ignition transformer 3 are mounted on the circuit unit 4 and soldered in the flow tank, the input terminal mounting lands 20 and 21 and the output terminal mounting are performed. This is to prevent the through holes of the lands 22, 23, 24 and 25 for use from being blocked with solder. That is, when these lands are annular lands, when the electronic component and the ignition transformer 3 are mounted and soldered in the flow tank, the solder adheres to the entire land and the central through hole is blocked with the solder. May end up. Thus, if the through hole is blocked with solder, when the circuit unit 4 is accommodated in the external housing 2, the connection terminal cannot be penetrated through the through hole of the land and cannot be soldered. It is because it may end up. For this reason, in this embodiment, the land portion on the side that comes into contact with the solder in the flow tank is cut out to prevent the solder from closing the through-hole portion of the land.

  Depending on the process, first, only electronic components may be mounted on the circuit unit 4 and soldered in a flow tank without mounting the ignition transformer 3. In such a case, it is preferable that the land on which the ignition transformer 3 is soldered has a similar shape.

  Furthermore, openings 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 are provided at the end of the circuit unit 4 by cutting or the like. The outer casing 2 can be easily and reliably filled with a molding material made of resin or the like. Of these openings, the opening 28 has an action of insulating the primary sides, and the openings 29 to 33 have an action of insulating the primary side and the secondary side. , 35 have an action of insulating between the secondary sides.

  As shown in FIG. 4, the output side terminal 40 is composed of a conductive metal plate or the like, and an insertion portion 41 inserted into the external housing 2 is formed into a thin pin shape. A connecting portion 42 located outside and connected to the ignition plug of the combustion device is formed in a flat plate shape. Further, between the insertion portion 41 and the connection portion 42, there is provided a locking portion 43 having an intermediate width and formed in a stepped shape, and a taper is provided on the insertion portion 41 side of the locking portion 43. A portion 44 is provided.

  On the other hand, the outer housing 2 is formed with an insertion hole 45 that matches the size of the insertion portion 41. Further, outside the insertion hole 45, a locking part insertion hole 46 into which the locking part 43 is inserted and a connection part insertion hole 47 into which the connection part 42 is inserted are formed in steps. That is, stepped insertion holes 47, 46, 45 are formed in the outer housing 2 so that the opening area gradually decreases from the outside. The tapered portion 44 is press-fitted into the insertion hole 45 having the smallest opening area, so that the entire output side terminal 40 is supported by the external housing 2.

  Thus, by making the structure of the insertion portion of the output side terminal 40 into a stepped structure having a plurality of steps, the opening area of the insertion hole 45 formed in the external housing 2 can be substantially reduced. The small opening can be closed by the output side terminal 40 inserted from the outside. Thereby, it is possible to prevent the molding material from leaking from the attachment portion of the output side terminal 40.

  In the present embodiment, since the tapered portion 44 is press-fitted into the insertion hole 45, it is possible to reliably prevent the molding material from leaking from the attachment portion of the output side terminal 40. The outer casing 2 is provided with a protective cylinder 48 so as to surround the connection portion 42 of the output side terminal 40.

  Furthermore, in the present embodiment, the distal end of the insertion portion 41 of the output side terminal 40 is inserted into one of the output side terminal mounting lands 22, 23, 24, 25 of the circuit unit 4 and soldered. Thereby, the output side terminal 40 can be fixed in a state where the tapered portion 44 of the output side terminal 40 is press-fitted into the insertion hole 45, and the portion of the insertion hole 45 can be reliably closed. Therefore, it can prevent reliably that a mold material leaks from here.

  Note that input side terminals 61 and 62 described later have substantially the same configuration. As a result, it is possible to prevent the leakage of the molding material from the attachment portions of the input side terminals 61 and 62.

  Next, the structure of the attachment part to the combustion apparatus provided in the external housing | casing 2 is demonstrated. As shown in FIG. 5, attachment claws 51 and 52 are provided at both ends in the longitudinal direction of the external housing 2. Among these, the attachment claw 51 on the right side in the figure is fixed to the external housing 2. On the other hand, the attachment claw 52 on the right side in the figure has an attachment part 53 extending laterally from the side wall part of the external housing 2 and a bending part 54 extending upward in the figure along the side wall part from the tip side of the attachment part 53. And a claw 55 provided at the tip of the bent portion 54. Then, the claw 55 at the tip can be moved in the left-right direction in the figure mainly by elastically bending the bent portion 54.

  Moreover, as shown in FIG. 6, the corner | angular part of the connection part with the attaching part 53 of the bending part 54 is the chamfering part 56 of the chamfered shape. Therefore, the width W2 of the attachment portion 53 is smaller than the width W1 of the flexure portion 54 shown in FIG.

  By providing the chamfered portion 56 in this manner, the bent portion 54 and the attachment portion 53 are easily bent as a whole.For example, even when the external housing 2 is configured using a glass reinforced PBT resin having excellent heat resistance, The stress applied at the time of attachment / detachment can be relaxed to prevent the occurrence of folding. Moreover, when manufacturing the external housing | casing 2, there exists an effect which makes it difficult to produce the short of resin etc.

  When attaching the high voltage generator 1 for the discharge ignition device configured as described above to the combustion device, first, the attachment claws 51 of the external housing 2 are fitted into the attachment portions of the combustion device, and then the attachment claws. 52 is bent and the claw 55 is fitted to the attachment portion of the combustion device. Further, a power source is connected to the input side terminals 61 and 62 shown in FIG. 6, and the input terminal of the spark plug is connected to the connecting portion 42 of the output side terminal 40 provided in the protective cylinder 48.

  The power supply voltage input from the input side terminals 61 and 62 is boosted to a predetermined voltage by the ignition transformer 3, thereby generating a high voltage at the output side terminal 40. This high voltage causes a spark discharge in the spark plug to ignite a gas burner or an oil burner.

  As described above, according to the high voltage generator 1 for a discharge ignition device of the present embodiment, leakage of the molding material from the electrode terminal mounting portion in the outer casing 2 can be prevented. The mold material can be filled in a good state.

Sectional drawing which shows the structure of the high voltage generator for discharge ignition apparatuses which concerns on one Embodiment of this invention. The perspective view for demonstrating the whole structure of the high voltage generator for discharge ignition devices of FIG. The top view which shows the structure of the circuit unit of the high voltage generator for discharge ignition devices of FIG. The figure for demonstrating the structure of the output side terminal of the high voltage generator for discharge ignition devices of FIG. The side view which shows the structure of the external housing | casing of the high voltage generator for discharge ignition devices of FIG. The front view which shows the structure of the external housing | casing of the high voltage generator for discharge ignition devices of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... High voltage generator for discharge ignition devices, 2 ... External housing, 3 ... Ignition transformer, 4 ... Circuit unit, 6 ... Magnetic core, 7 ... Coil bobbin, 8 ... Terminal arrangement part, 9 ...... Output pin, 10 ...... Opening part, 11 ...... Supporting part, 12 ...... curved part, 13 ...... joining part, 14 ...... contact part, 15 ...... outer part, 16 ...... outer side, 17 ...... ... inner side.

Claims (4)

In the high voltage generator for a discharge ignition device that supplies a high voltage to the spark plug to cause a spark discharge and ignites the fuel,
An ignition transformer configured to insert a magnetic core wound with a primary winding into a central hole of a cylindrical coil bobbin wound with a secondary winding, and boost a power supply voltage;
A circuit unit on which electronic components are mounted;
An external housing that houses the ignition transformer and the circuit unit and is filled with a molding material, and has an outer housing formed with a stepped insertion hole that gradually decreases in opening area from the outside;
A high voltage generator for a discharge ignition device, comprising: an electrode terminal that is inserted into the insertion hole from the outside of the external housing and has a tip portion electrically connected to the circuit unit.   2. The high voltage generator for a discharge ignition device according to claim 1, wherein the electrode terminal is formed with a stepped portion that gradually increases in width from the insertion side in accordance with the stepped insertion hole.   3. The high voltage generator for a discharge ignition device according to claim 2, wherein a taper portion that is press-fitted into a portion of the insertion hole having the smallest opening area is formed in the electrode terminal.   The high voltage generator for a discharge ignition device according to any one of claims 1 to 3, wherein a tip of the electrode terminal is soldered to a land provided in the circuit unit.

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