JP2005024232A - Discharge ignition device for combustion appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a yield in manufacturing a discharge ignition device for a combustion appliance, the reliability and the durability by inhibiting the disconnection of a secondary winding caused by the partial thermal deformation of a bobbin of an ignition transformer. <P>SOLUTION: A high voltage generator has the ignition transformer 13 for raising a power source voltage to a specific voltage. The ignition transformer 13 has the bobbin 19 on which a primary winding 20 and the secondary winding 18 are mounted. Recessed parts 28 are formed on an outer face of the bobbin 19, and connection pins 23, 24 for the secondary winding are stood in the recessed parts 28 with spaces around them. Further the second winding 18 is wound on a part exposed from the recessed parts 28, of the connection pins 23, 24 for secondary winding. The connection pin 23 for output is connected with an output terminal. By electrically connecting a discharge electrode of the ignition plug with the output terminal of the high voltage generator, this discharge ignition device for a combustion appliance is constituted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a discharge ignition device used for 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 for a combustion appliance, a device in which a high voltage generator provided with 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 is generally used. (For example, see Patent Documents 1 and 2). Such a discharge ignition device ignites a gas burner or the like by generating a spark from a discharge electrode of an ignition plug by a secondary side voltage boosted by an ignition transformer.

  As an ignition transformer of a high voltage generator, for example, a transformer having a structure in which a magnetic core around which a primary winding is wound is inserted into a center hole of a bobbin around which a secondary winding is wound on an outer peripheral side. Yes. The bobbin of the ignition transformer has a good balance of properties among engineering plastics, and is generally formed of a polyacetal resin that is particularly excellent in mechanical strength and rigidity. Such an ignition transformer is housed in an external housing together with a circuit unit and the like. A resin sealing material is sealed in the external housing, and these constitute a high voltage generator.

  On the bobbin of the ignition transformer described above, a power connection pin to which the primary winding is connected and an output connection pin and an earth connection pin to which the secondary winding is connected are provided. The primary winding and the secondary winding are respectively wound around the base portion side of the connection pin and then electrically connected to the connection pin by soldering the winding portion. Here, an extremely fine resin-coated copper wire having a wire diameter of 0.05 mm, for example, is used so as to ensure a sufficient number of turns in the secondary winding of the ignition transformer and enable spark discharge.

As described above, since an extremely fine resin-coated copper wire or the like is used for the secondary winding, there is a problem that disconnection is likely to occur due to the thin wire diameter of the secondary winding. For example, in the solder dipping process, the base portion of the connection pin around which the secondary winding is wound is immersed in a solder bath having a temperature of about 240 to 250 ° C. At this time, the heat of the solder bath is transmitted to the bobbin formed of polyacetal resin or the like via the connection pin or the like. When the bobbin located on the base portion side of the connection pin melts and rises due to the heat transmitted from the solder bath, the secondary winding wound around that portion receives pressure. The pressure resulting from the bulge (thermal deformation) of the bobbin causes the disconnection of the secondary winding.
Japanese Patent Laid-Open No. 11-248155 Japanese Patent Laid-Open No. 11-294766

  As described above, since the ignition transformer of the conventional discharge ignition device for a combustion appliance uses an extremely fine resin-coated copper wire for the secondary winding, for example, due to local thermal deformation of the bobbin at the time of solder dipping Thus, there is a problem that the secondary winding is easily disconnected. Further, even when the discharge ignition device is not manufactured, the secondary winding receives pressure due to the thermal deformation of the bobbin, so that the possibility of disconnection due to heat shock during use increases. As described above, the local thermal deformation of the bobbin not only causes a decrease in manufacturing yield due to the wire breakage, but also causes a decrease in reliability and durability of the discharge ignition device. Therefore, it is strongly desired to suppress the disconnection of the winding accompanying the thermal deformation of the bobbin, particularly the disconnection of the secondary winding.

  The present invention has been made to address such problems. The present invention provides a discharge igniter for a combustion appliance that has improved yield, reliability, durability, etc. during manufacture of the device by suppressing disconnection of the winding of the ignition transformer caused by local thermal deformation of the bobbin. The purpose is to do.

(Claim 1)
A discharge ignition device for a combustion appliance according to the present invention includes a bobbin having a primary winding and a secondary winding for boosting a power supply voltage, and is connected to the primary winding or the secondary winding and connected to the bobbin. A high voltage generator including an ignition transformer having a standing connection pin; and an external housing for housing the ignition transformer; a tip portion functioning as a spark discharge end; the connection pin for the secondary winding; An ignition plug having a discharge electrode having a terminal portion connected to the ignition transformer, and among the connection pins of the ignition transformer, at least the connection pin for the secondary winding has a space around it. The secondary winding is erected in a recess provided on the outer surface of the bobbin, and the secondary winding is wound around a portion exposed from the recess of the connection pin.

  In the discharge ignition device for a combustion appliance according to the present invention, the secondary winding connection pin is erected in a recess provided on the outer surface of the bobbin so that a space is created around the secondary winding connection pin. Yes. Further, the secondary winding is wound around a portion exposed from the concave portion of the connection pin. Therefore, for example, even when the bobbin portion around the base portion of the connection pin is thermally deformed at the time of solder dipping, the rise due to the heat deformation of the bobbin can be stopped in the recess. That is, even if the bobbin is thermally deformed locally, the thermally deformed portion does not reach the secondary winding. As a result, the disconnection of the secondary winding due to the thermal deformation of the bobbin can be significantly suppressed.

(Claim 2)
One aspect of the discharge ignition device for a combustion appliance according to the present invention is an ignition transformer in which the concave portion has an inner dimension of 2 to 6 times the diameter of the connection pin and a depth of 0.3 to 1.0 mm from the outer surface of the bobbin. A high voltage generator is provided. By establishing a secondary winding connection pin in a recess having such an internal dimension and depth, it is more reproducible that the heat-deformed portion of the bobbin reaches the winding portion of the secondary winding. It can be well suppressed. Therefore, it is possible to prevent a decrease in manufacturing yield due to the disconnection of the secondary winding, and a decrease in reliability and durability due to pressure applied to the secondary winding by the heat-deformed portion of the bobbin.

  According to the discharge ignition device for a combustion appliance of the present invention, disconnection of the secondary winding caused by local thermal deformation of the bobbin of the ignition transformer can be suppressed. Therefore, the manufacturing yield of the discharge ignition device can be improved, and the reliability and durability can be further improved.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 shows the configuration of a discharge igniter for a combustion appliance according to a first embodiment of the present invention. A discharge igniter 1 for a combustion appliance shown in the figure includes a high voltage generator 2 and a spark plug 3. Such a discharge igniter 1 for a combustion appliance is used for various combustion appliances such as a gas combustion appliance such as a gas stove or a water heater, or an oil combustion appliance such as an oil fan heater.

  The high voltage generator 2 has an external housing 11 made of an insulating material such as resin. The external casing 11 includes a mounting portion 12 for installing the high voltage generator 2 and thus the discharge ignition device 1 on the combustion appliance body. In the external housing 11, an ignition transformer 13 and a circuit unit 16 in which an electronic component 14 such as a diode or a resistor is mounted on a printed board 15 are housed. The circuit unit 16 is electrically connected to a power supply terminal 17 provided on the lower surface side of the external housing 11. Although not shown, a resin sealant such as urethane resin is sealed in the external housing 11 and the fire transformer 13 and the circuit unit 16 are sealed.

  As shown in FIGS. 2 and 3, the ignition transformer (step-up transformer) 13 has a coil bobbin 19 around which a secondary winding 18 is wound. The coil bobbin 19 is made of an insulating resin material such as polyacetal resin. The coil bobbin 19 has a center hole, and a magnetic core 21 such as an iron core around which the primary winding 20 is wound is inserted into the center hole. Based on the number of turns of the primary winding 20 and the secondary winding 18, the power supply voltage is boosted to a predetermined high voltage. On the outer surface of the coil bobbin 19, power connection pins 22, 22 to which the primary winding 20 is connected, an output connection pin 23 to which the secondary winding 18 is connected, and a ground connection pin 24 are erected. . The ground connection pin 24 is grounded to the combustion appliance body. For each of these connection pins 22, 23, 24, for example, a mild steel wire with solder plating is used.

  The primary winding 20 of the ignition transformer 13 as described above is wound around the magnetic core 21 so that the number of turns is generally about 20 to 60 turns. For this reason, a coated conductor such as a urethane-coated copper wire having a wire diameter of about 0.3 mm is used for the primary winding 20. Both ends of the primary winding 20 are wound around the root portions of the power connection pins 22 and 22, respectively. The winding portions 25 of the primary windings 20 are solder-dipped, whereby the primary windings 20 and the power connection pins 22 are electrically connected. The primary winding 20 is connected to the power supply terminal 17 via the power connection pin 22 and the circuit unit 16.

  On the other hand, the secondary winding 18 needs to be wound around the coil bobbin 19 so that the number of turns is about 2000 to 6000 turns. For this reason, for the secondary winding 18, for example, a coated conductor such as a urethane-coated copper wire having a wire diameter of about 0.05 mm is used. Both ends of the secondary winding 18 are wound around the output connection pin 23 and the ground connection pin 24, respectively. The winding portions 26 of the secondary windings 18 are soldered, whereby the secondary winding 18 and the output and ground connection pins 23 and 24 are electrically connected.

  By the way, since the secondary winding 18 using an ultra-fine urethane-coated copper wire or the like has low strength, there is a risk of disconnection even when a slight force is applied. Therefore, in the discharge ignition device 1 for a combustion appliance of this embodiment, as shown in FIG. 4, the connection pins 23 and 24 for the secondary winding 18 (the output connection pin 23 and the ground connection pin 24) are The coil bobbin 19 is erected in a recess 28 provided on the outer surface 27.

  That is, the outer surface 27 of the coil bobbin 19 is provided with a recess 28 at a portion where the connection pins 23 and 24 for the secondary winding 18 are erected. These recesses 28 have inner dimensions larger than the diameters of the connecting pins 23, 24. A pin insertion hole is formed in each recess 28, and each connection pin 23, 24 is press-fitted into the pin insertion hole. Accordingly, the root portions of the connection pins 23 and 24 exist in the recess 28, respectively, and a space formed by the recess 28 is formed around the base portion.

  The shape of the recess 28 described above is not particularly limited. For example, FIGS. 5 and 6 show a coil bobbin 19 having a round hole 29 as a recess. The connection pins 23 and 24 are erected in the round hole 29. When the round hole 29 is applied as the recess, the inner dimension of the recess indicates the inner diameter D 1 of the round hole 29. 7 and 8 show a coil bobbin 19 having a square hole 30 as a recess. The connection pins 23 and 24 are erected in the square hole 30. When the square hole 30 is applied as the recess, the inner dimension of the recess indicates the diameter D2 of the maximum circle inscribed in the square hole 30.

  The secondary winding 18 is wound around a portion exposed from the recess 28 of each connection pin 23, 24. Specifically, the winding portion 26 of the secondary winding 18 is provided on a portion directly above the recess 28, in other words, on the outer surface 27 of the coil bobbin 19, and is provided on the portion directly above the reference surface. The secondary winding 18 is wound around a portion having a width of about 2 mm from the reference surface of each of the connection pins 23 and 24 with, for example, about 10 to 20 turns. The secondary winding 18 is not wound around the portion (root portion) present in the recess 28 of the connection pins 23, 24, and the root portion of the connection pins 23, 24 is allowed to thermally deform the coil bobbin 19. It is functioning as.

  That is, the winding portion 26 of the secondary winding 18 described above is solder-diped, whereby the secondary winding 18 is electrically connected to the output connection pin 23 and the ground connection pin 24. In the solder dipping process, the winding portion 26 of the secondary winding 18 is immersed in a solder bath having a temperature of about 240 to 250 ° C. At this time, the heat of the solder bath is transmitted to the coil bobbin 19 through the connection pins 23 and 24, and the peripheral portions of the connection pins 23 and 24 are locally melted and raised. In the conventional ignition transformer, the local thermal deformation of the coil bobbin has been a cause of the disconnection of the secondary winding or the reliability and durability of the discharge ignition device.

  In contrast, in the ignition transformer 13 of this embodiment, the connection pins 23 and 24 are erected in the recess 28 to create a space around the connection pins 23 and 24. Furthermore, the winding part 26 of the secondary winding 18 is provided in the part exposed from the recessed part 28 of the connection pins 23 and 24. Therefore, as shown in FIG. 9, even if the peripheral portions of the connection pins 23 and 24 of the coil bobbin 19 are swelled by heat, the swelled portion (thermally deformed portion) 31 does not reach the winding portion 26. That is, since the concave portion 28 functions as a buffer portion for the raised portion 31 of the coil bobbin 19, the raised portion 31 can be prevented from reaching the winding portion 26. Accordingly, disconnection of the secondary winding 18 due to thermal deformation of the coil bobbin 19 is prevented, and a reduction in manufacturing yield due to disconnection of the secondary winding 18 can be suppressed.

  Furthermore, even if the secondary winding 18 is not broken, if the rising portion 31 reaches the winding portion 26 and pressure is applied, the secondary winding 18 is broken due to heat shock or the like during use of the apparatus. The risk of doing so increases. With respect to such a point, the heat shock resistance of the secondary winding 18 can be improved by stopping the raised portion 31 of the coil bobbin 19 in the recess 28. Therefore, it is possible to improve the reliability and durability of the ignition transformer 13 and thus the high voltage generator 2.

  The inner dimension and depth of the recess 28 described above are appropriately set depending on the material of the coil bobbin 19 and the amount of heat transmitted during solder dipping. For example, when polyacetal resin is used as the constituent material of the coil bobbin 19, the inner dimension of the recess 28 is preferably in the range of 2 to 6 times the diameter of the connection pins 23 and 24. The inner dimension of the recess 28 referred to here is the inner diameter D1 in the case of the round hole 29 and the diameter D2 of the maximum circle inscribed in the case of the square hole 30 as described above. The depth of the recess 28 is preferably in the range of 0.3 to 1.0 mm from the outer surface 27 of the coil bobbin 19. By erecting the connection pins 23 and 24 in the recess 28 having such a shape, it is possible to reliably and reliably prevent the raised portion 29 of the coil bobbin 19 from reaching the winding portion 26.

  When the inner dimension (for example, D1 or D2) of the concave portion 28 is less than twice the pin diameter or the depth of the concave portion 28 is less than 0.3 mm, it serves as a buffer portion against the local thermal deformation of the coil bobbin 19 described above. There is a possibility that sufficient functions cannot be obtained. On the other hand, even if the inner dimension of the recess 28 exceeds 6 times the pin diameter, no further effect can be expected and the design of the coil bobbin 19 may be hindered. Similarly, even if the depth of the recess 28 is increased beyond 1.0 mm, no further effect can be expected. Furthermore, the filling state in the recesses 28 with the resin sealant tends to be non-uniform, and the reliability of the apparatus may be reduced.

  As a specific example of the ignition transformer 13 as described above, a primary winding 20 made of a urethane-coated copper wire having a wire diameter of 0.3 mm is wound with 55 turns and a urethane-coated copper wire having a wire diameter of 0.05 mm. An ignition transformer was produced by winding the secondary winding 18 composed of 800 turns × 8. For the output connection pin 23 and the ground connection pin 24, solder-plated mild steel wires each having a diameter of 1.0 mm were used. These connection pins 23 and 24 were erected in a recess 28 having an inner diameter of 2.5 mm and a depth of 0.5 mm. Further, both end portions of the secondary winding 18 were wound at 10 turns / 2 mm around the concave portions of the output connection pin 23 and the ground connection pin 24, respectively. In this state, solder dipping was performed up to the winding portion 26 of the secondary winding 18. On the other hand, as a comparative example with the present invention, the output and ground connection pins are directly erected on the outer surface of the coil bobbin, and the secondary winding is wound around the base portion of these connection pins under the same conditions as in the embodiment. Produced.

  The state of the secondary winding of each ignition transformer according to the above-described example and comparative example was measured and evaluated. First, 100 ignition transformers according to Examples and Comparative Examples were prepared, and the presence or absence of disconnection of the secondary winding after solder dipping was measured and evaluated. As a result, in the example, the number of disconnected ignition transformers was 0 in 100, whereas in the comparative example, disconnection occurred in secondary windings of 5 of 100 ignition transformers after solder dipping. From the measurement and evaluation results, it can be seen that the ignition transformer having the connection pin standing structure described above is excellent in productivity.

  Next, a heat shock resistance test was performed on the sound ignition transformer that was not disconnected in the following manner. Thereafter, the presence or absence of disconnection of the secondary winding was measured and evaluated. The heat shock resistance test was performed by applying a thermal cycle of −25 ° C. × 1 hr + 85 ° C. × 1 hr to each ignition transformer. As a result, at the time when 1000 heat cycles were added, in the example, there were 0 ignition transformers that were disconnected, whereas in the comparative example, 95 ignition transformers, and 4 additional ignition transformers. Disconnection occurred. From the measurement and evaluation results, it is understood that the discharge ignition device 1 using the ignition transformer having the connection pin standing structure described above is excellent in reliability and durability.

  In this embodiment, the ignition transformer 13 in which only the connection pins for the secondary winding 18 (the output connection pin 23 and the ground connection pin 24) are erected in the recess 28 has been described. The present invention is not limited to such a configuration. Similarly, the power connection pin 22 for the primary winding 20 can be erected in the recess 28. Also in this case, durability and reliability of the discharge ignition device 1 can be improved. However, since the primary winding 20 has a larger wire diameter than the secondary winding 18, the risk of disconnection due to local thermal deformation of the coil bobbin 19 is smaller than that of the secondary winding 18.

  On the upper surface side of the external housing 11 in which the ignition transformer 13 as described above is housed, a cylindrical convex portion 32 that is an attachment portion of the ignition plug 3 is provided. The cylindrical convex portion 32 communicates with the inside of the outer casing 11. An output terminal 33 is disposed in the cylindrical convex portion 32. The output terminal 33 is electrically connected to the output connection pin 23 of the ignition transformer 13. The front end portion of the output terminal 33 is disposed in the cylindrical convex portion 32, and is thereby exposed to the external space of the external housing 11. A female connector 34 is attached to the tip of the output terminal 33. In this embodiment, a plug contact is used for the connector 34.

  On the other hand, the spark plug 3 has a discharge electrode 41 made of a heat-resistant metal rod. The tip portion 42 of the discharge electrode 41 is scheduled to be installed in the vicinity of the burner of the combustion appliance, and functions as a spark discharge end. The outer peripheral portion of the discharge electrode 41 is covered with an insulator 44 so as to expose the front end portion 42 and the terminal end portion 43 thereof. The discharge electrode 41 is protected by an insulator 44. For the insulator 44, a heat-resistant and insulating ceramic material such as alumina is used. A concave portion 45 constituting an attachment portion to the high voltage generator 2 is provided at an end portion of the insulator 44 on the terminal end portion 43 side. The terminal portion 43 of the discharge electrode 41 is exposed in the recess 45.

  The terminal portion (connection end) 43 of the discharge electrode 41 is used as a connection plug for directly connecting to the output terminal 33 of the high voltage generator 2, and its tip is processed into a tapered shape. A terminal portion 43 of the discharge electrode 41 is inserted and connected to a connector 34 attached to the output terminal 33. At the same time, the recess 45 provided at the end of the insulator 44 is attached to the cylindrical protrusion 32 of the high voltage generator 20. With such a structure, the high voltage generator 2 and the spark plug 3 are mechanically coupled and electrically connected. According to the plug-in contact type direct connection structure, it is possible to prevent the generation of a capacitance component due to an intermediate high-voltage cable or the like. Furthermore, the discharge electrode 41 and the output terminal 33 can be detachably connected, and their electrical connection reliability can be improved.

  In this embodiment, the connection structure in which the discharge electrode 41 and the output terminal 33 are directly connected using the connector 34 such as a plug contact has been described. The present invention is not limited to such a direct connection structure, and the discharge electrode 41 and the output terminal 33 can be directly connected using, for example, a compression-type or crimp-type connection terminal. Further, the connection between the discharge electrode 41 and the output terminal 33 is not limited to the direct connection type, and the discharge electrode 41 and the output terminal 33 may be electrically connected by interposing a high voltage cable or the like.

  Furthermore, in this embodiment, the spark plug 3 in which the outer peripheral portion of the discharge electrode 41 is covered with the insulator 44 is used, but the insulator 44 can be omitted. That is, the spark plug 3 may be composed of only the discharge electrode 41. In such a case, attachment of the spark plug 3 to the combustion appliance main body is performed using, for example, a support portion of the discharge electrode 41 provided on the combustion appliance main body side. A support structure or the like that mechanically supports the discharge electrode 41 while ensuring insulation between the discharge electrode 41 and the combustion instrument body is used for the support portion provided on the combustion instrument body side.

  In the above-described combustion appliance discharge ignition apparatus 1, the voltage input from the power supply terminal 17 is boosted to a predetermined voltage by the ignition transformer 13 of the high voltage generator 2 to generate a high voltage at the output terminal 33. This high voltage is applied from the output terminal 33 to the discharge electrode 41 of the spark plug 3, and a spark is generated from the tip portion (spark discharge end) 42 of the discharge electrode 41. The discharge ignition device 1 ignites a gas burner, an oil burner, or the like by a spark generated at the tip 42 of the discharge electrode 41.

  In the discharge ignition device 1 for a combustion appliance of this embodiment, the connection pins 23 and 24 for the secondary winding 18 in the ignition transformer 13 are erected in the recess 28, and the winding portion 26 of the secondary winding 18 is recessed. 28 is provided in a portion exposed from 28. According to such a standing structure of the connection pins 23 and 24, disconnection of the secondary winding 18 due to local thermal deformation of the coil bobbin 19 is suppressed. Therefore, the manufacturing yield of the high voltage generator 2 can be improved. Furthermore, since local thermal deformation of the coil bobbin 19 does not adversely affect the secondary winding 18, disconnection of the secondary winding 18 due to heat shock or the like during use of the apparatus is suppressed. Therefore, it becomes possible to improve the reliability and durability of the high voltage generator 2 and thus the discharge igniter 1 for a combustion appliance.

  Next, a second embodiment of the discharge igniter for a combustion appliance of the present invention will be described with reference to FIGS. The same parts as those in FIGS. 1 to 9 are denoted by the same reference numerals, and the description thereof is partially omitted.

  The ignition transformer 51 shown in FIGS. 10 and 11 is used in a discharge ignition device having a plurality of spark plugs, and has a plurality of secondary windings and output connection pins. That is, the ground connection pin 24 is erected at the center of the coil bobbin 52, and the first secondary winding 53 and the second secondary winding 54 are wound on both sides thereof. Corresponding to these first and second secondary windings 53, 54, a first output pin 55 and a second output pin 56 are erected on both sides of the coil bobbin 52.

  The ground connection pin 24 and the first and second output pins 55 and 56 are respectively provided upright in the recess 28 provided on the outer surface of the coil bobbin 52, as in the first embodiment shown in FIG. Yes. The first and second secondary windings 53 and 54 are wound around portions of the connection pins 24, 55 and 56 exposed from the recesses 28, respectively. The shape of the recess 28 and the winding part 26 of the secondary windings 53 and 54 have the same configuration as in the first embodiment. The remaining configuration of the ignition transformer 51 is the same as that of the ignition transformer 13 of the first embodiment described above.

  The ignition transformer 51 having the plurality of secondary windings 52 and 53 and the plurality of output connection pins 55 and 56 is not shown in the figure, but is housed in the external housing as in the first embodiment. Is done. An output terminal is connected to each of the output connection pins 55 and 56. And the ignition ignition device for combustion appliances of this embodiment is comprised by connecting an ignition plug to each of these output terminals. In addition, about the structure of the discharge ignition device other than these, it is set to be the same as that of 1st Embodiment.

  The present invention is also effective for a discharge ignition device in which a plurality of spark plugs as described above are connected to a high voltage generator. That is, disconnection of the secondary windings 53 and 54 due to local thermal deformation of the coil bobbin 52, and further reduction in reliability and durability can be suppressed. As a result, it is possible to improve the manufacturing yield of the high-voltage generator and further improve the reliability and durability of the discharge ignition device having a plurality of spark plugs. It should be noted that the number of spark plugs connected to the high voltage generator is not limited to two, and it goes without saying that the same effect can be obtained even with three or more spark plugs.

It is sectional drawing which shows the structure of the discharge ignition device for combustion appliances by the 1st Embodiment of this invention. It is a front view of the ignition transformer in the discharge ignition device for combustion appliances shown in FIG. FIG. 3 is a side view of the ignition transformer shown in FIG. 2. FIG. 4 is an enlarged cross-sectional view showing a standing structure of a secondary winding connection pin of the ignition transformer shown in FIGS. 2 and 3. It is a top view which shows an example of the recessed part shape which stands up the connecting pin for secondary windings. It is a figure which shows the standing structure of the recessed part shown in FIG. 5, and the connecting pin for secondary winding in a cross section. It is a top view which shows the other example of the recessed part shape which erects the connecting pin for secondary windings. It is a figure which shows the standing installation structure of the recessed part shown in FIG. 7, and the connection pin for secondary winding in a cross section. FIG. 5 is a cross-sectional view showing a state after solder dipping at a standing portion of the secondary winding connection pin shown in FIG. 4. It is a front view which shows the structure of the ignition transformer in the 2nd Embodiment of this invention. It is a side view of the ignition transformer shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Discharge ignition device for combustion appliances, 2 ... High voltage generator, 3 ... Spark plug, 11 ... External housing, 13, 51 ... Ignition transformer, 18, 53, 54 ... Secondary winding, 19, 51 ... Coil bobbin 20 ... primary winding, 21 ... magnetic core, 23, 55, 56 ... output connection pin, 24 ... ground connection pin, 26 ... secondary winding winding, 28, 29, 30 ... recess, 33 ... Output terminal 41... Discharge electrode, 42... Tip portion (spark discharge end), 43 .. end portion (connection end), 44.

Claims (5)

An ignition transformer having a bobbin provided with a primary winding and a secondary winding for boosting a power supply voltage, and a connection pin connected to the primary winding or the secondary winding and standing on the bobbin; A high voltage generator comprising an external housing for housing the ignition transformer;
A spark plug including a discharge electrode having a tip portion functioning as a spark discharge end and a terminal portion electrically connected to the connection pin for the secondary winding;
Of the connection pins of the ignition transformer, at least the connection pin for secondary winding is erected in a recess provided on the outer surface of the bobbin so that a space is created around the connection pin, and the secondary winding The coil is wound around a portion exposed from the recess of the connection pin.   2. The combustion appliance according to claim 1, wherein the recess has an inner dimension of 2 to 6 times the diameter of the connection pin and has a depth of 0.3 to 1.0 mm from the outer surface of the bobbin. Discharge ignition device.   3. The bobbin according to claim 1, wherein the bobbin has a center hole through which the magnetic core around which the primary winding is wound is inserted, and an outer peripheral portion around which the secondary winding is wound. Discharge ignition device for combustion appliances.   The discharge ignition device for a combustion appliance according to any one of claims 1 to 3, wherein the ignition plug includes an insulator for protecting the discharge electrode.   The discharge ignition device for a combustion appliance according to any one of claims 1 to 4, wherein a resin sealant is sealed in the external casing.

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