JP3599407B2 - Electric igniter and manufacturing method thereof - Google Patents

Description

【００２６】
表１に示したように、本発明の電気点火具１０および１５は、圧填方式の電気点火具２０よりも良好な動作を示した。
【００２７】
【発明の効果】
以上、詳細に説明したように本発明の方法で製造された電気点火具は、生産効率を上げることができ、製造コストが低く量産が可能であり、しかも気密性が高く長期間性能を確保できる。また点火薬を密封するのにガラスを使用しているため、必要に応じて種々の大きさ、形状の電気点火具を製造することができる。
【図面の簡単な説明】
【図１】本発明を適用する電気点火具の実施例を示す要部断面斜視図である。
【図２】本発明を適用する電気点火具の別の実施例を示す要部断面斜視図である。
【図３】本発明を適用する電気点火具を使用したソケット型電気点火具を示す外観図である。
【図４】本発明を適用する電気点火具を使用した別のソケット型電気点火具を示す外観図である。
【図５】従来の電気点火具の例を示す断面図である。
【符号の説明】
１・２５は発熱抵抗線、２はガラス玉、３・４は電極ピン、６・９はガラス管、７は点火薬、８は樹脂、１０・１５・２０は電気点火具、１１は断熱材、１２・１３はソケット、２１・２２は電極ピン、２３は絶縁体、２４は金属ケース、２６は点火薬である。[0001]
[Industrial applications]
The present invention relates to an electric igniter for igniting various pyrotechnics and a method for manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art An electric igniter is used as a device that requires a large amount of power instantaneously, for example, a device for igniting a pretensioner for a vehicle seat belt or a driving source for an airbag.
[0003]
Electric igniters mainly include a pressurized type and an ignition ball type.
As shown in FIG. 5, a press-fit type electric igniter 20 is one in which a metal cap 27 is sealed by laser welding or caulking to a metal case 24 in which an insulator 23 penetrated by electrode pins 21 and 22 is fitted. It is. Inside the electric igniter 20, a heating resistance wire 25 is bridged to the tip of the electrode pins 21 and 22, and an igniter 26 is pressed. In the electric igniter 20, the heating resistor wire 25 is heated by energizing the electrode pins 21 and 22, and the ignition charge 26 is ignited.
[0004]
The ignition ball type electric igniter contains an ignition ball in which an igniter is applied to a heating resistance wire in a metal case, and a resin plug with two electrode pins penetrated to the metal case is bonded with an adhesive. Or crimped and sealed. Inside the metal case, the heating resistance wire is cross-linked to two electrode pins. The electric igniter is ignited by energizing the electrode pins.
[0005]
[Problems to be solved by the invention]
However, the press-fit type electric igniter 20 requires high accuracy when positioning the heating resistance wire 25 and welding when bridging the heating resistance wire 25 to the electrode pins 21 and 22. Since the smoothness of the welded surface is also required, it has to be polished when fixed to the insulator 23, which causes a reduction in production efficiency and an increase in manufacturing cost.
[0006]
When the metal cap 27 is sealed to the metal case 24 by laser welding, a plate thickness and a shape are required so that the igniter 26 (ignition temperature 150 to 300 ° C.) is not ignited, and special equipment for performing laser welding is also required. Met. In the case of caulking and sealing, it is difficult to secure airtightness, and it is necessary to use the sealant together.
[0007]
The ignition ball type electric igniter prevents the generation of air bubbles when applying 20 to 30 mg of igniting powder kneaded with a binder so as to wrap the heating resistance wire cross-linked to the electrode pins 21 and 22 or prevents the heating resistance wire from being generated. A considerable amount of skill was required to completely keep the wrapped shape and size constant, and automation was difficult, causing an increase in manufacturing cost. When a resin embolus is adhered to a metal case with an adhesive or caulked and hermetically sealed, it is difficult to secure airtightness due to deterioration of the resin, and performance cannot be ensured for a long time.
[0008]
The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an electric igniter capable of increasing production efficiency, reducing production costs, maintaining high airtightness and ensuring long-term performance, and a method for producing the same. .
[0009]
[Means for Solving the Problems]
As shown in FIG. 1, an electric igniter 10 according to the present invention for achieving the above object has a heating resistor wire 1 inside a glass tube 6 and contacts the heating resistor wire 1 to charge an ignition charge. 7 is a filled electric igniter 10, in which one end of a glass tube 6 is coated with a resin 8, the other end of the glass ball 2 is fused and sealed, and the heating resistance wire 1 penetrates the glass ball 2. It is crosslinked to two electrode pins 3 and 4.
[0010]
As shown in FIG. 2, the electric igniter 15 of the present invention made to achieve the above object has the heating resistance wire 1 inside the glass tube 9 having one end sealed, and the heating resistance wire 1 An electric igniter 15 filled with an igniter 7 by contacting the glass ball 2 with the other end thereof, the glass ball 2 being fused and hermetically sealed, and the two electrode pins 3 having the heating resistance wire 1 penetrating the glass ball 2.・ Crosslinked to 4.
[0011]
As shown in FIG. 2, the electric igniter 15 of the present invention made to achieve the above object has the heating resistance wire 1 inside the glass tube 9 having one end sealed, and the heating resistance wire 1 And an electric igniter 15 filled with a heat insulating material 11 laminated on the igniter 7, and a glass ball 2 is fused and sealed at the other end, and the heating resistance wire 1 is made of glass. Two electrode pins 3 and 4 penetrating the ball 2 are bridged.
[0012]
The method for manufacturing the electric igniter 10 according to the present invention, which has been made to achieve the above object, is based on a method in which the two electrode pins 3.4 are fused and fixed to the glass ball 2 as shown in FIG. The heating resistor wire 1 is cross-linked to the electrode pins 3 and 4, the heating resistor wire 1 is inserted from one end of the glass tube 6, and one end of the heating resistor wire 1 is fused to the glass ball 2 and sealed. Is filled with an ignition charge 7 by contacting the heating resistance wire 1, and the other end of the glass tube 6 is covered with a resin 8 and sealed.
[0013]
The method for manufacturing the electric igniter 15 of the present invention, which has been made to achieve the above-mentioned object, uses a method in which two electrode pins 3.4 are fused and fixed to the glass ball 2 as shown in FIG. The heat generating resistance wire 1 is cross-linked to the electrode pins 3 and 4, and an ignition charge 7 is filled in a glass tube 9 having one end sealed, and the heat generation resistance wire 1 is brought into contact with the ignition charge 7 in the glass tube 9. Then, the other end of the glass tube 9 and the glass ball 2 are fused and sealed.
[0014]
The method for manufacturing the electric igniter 15 of the present invention, which has been made to achieve the above-mentioned object, uses a method in which two electrode pins 3.4 are fused and fixed to the glass ball 2 as shown in FIG. The heating resistor wire 1 is cross-linked to the electrode pins 3 and 4, the heating resistor wire 1 is inserted from one end of the glass tube 9, and one end of the heating resistor wire 1 is fused and sealed to the glass tube 9. Is filled with the ignition charge 7 by contacting with the heating resistance wire 1, laminated on the ignition charge 7, filled with the heat insulating material 11, and the other end of the glass tube 9 is fused and sealed.
[0015]
[Action]
When the electric igniter is manufactured by the method of the present invention, there is no step of pressing the igniting agent or applying the igniting agent to the heating resistance wire, and the igniting agent can be hermetically sealed by fusion of glass or resin coating. You don't have to. Therefore, the electric igniter can be mass-produced at low cost.
[0016]
Further, the melting point of glass is 700 ° C., which is lower than the melting point of metal of 1300 to 1500 ° C., and has low thermal conductivity, so that it is suitable for sealing igniters with a high risk of ignition.
[0017]
【Example】
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a cross-sectional perspective view of a main part showing an embodiment of an electric igniter 10 to which the present invention is applied. The electric igniter 10 has a glass tube 6 filled with an ignition charge 7, and the heating resistance wire 1 is housed in contact with the ignition charge 7. One end of the glass tube 6 is coated with a resin 8 and sealed, and the other end of the glass tube 6 is sealed by fusing the glass ball 2 to maintain airtightness. The electrode pins 3 and 4 penetrate and are fused and fixed to the glass ball 2, and a heating resistance wire 1 is cross-linked at the tip of the electrode pins 3 and 4. The other ends of the electrode pins 3 and 4 are connected to a power supply (not shown).
[0018]
The electric igniter 10 is manufactured as follows.
First, after the glass ball 2 is melted and penetrated through the electrode pins 3 and 4, it is cooled and fixed, and a heating resistance wire 1 such as a nichrome wire is cross-linked to the tips of the electrode pins 3 and 4. Next, the heating resistance wire 1 is inserted into the glass tube 6, and the glass ball 2 is fused and sealed to one end of the glass tube 6 under an argon gas atmosphere. After that, an ignition charge 7 is filled in a powder or slurry state so as to be in contact with the heating resistance wire 1 in the glass tube 6 and dried, and then the other end of the open glass tube 6 is coated with a resin 8 and sealed.
[0019]
FIG. 2 is a cross-sectional perspective view of a main part showing an embodiment of the electric igniter 15 to which the present invention is applied. The electric igniter 15 is filled with an igniter 7 and a heat insulating material 11 laminated on the igniter 7 inside a glass tube 9 having one end sealed. 1 is stored. The other end of the glass tube 9 is sealed by fusing the glass ball 2 to maintain airtightness. The electrode pins 3 and 4 penetrate and are fused and fixed to the glass ball 2, and a heating resistance wire 1 is cross-linked at the tip of the electrode pins 3 and 4. The other ends of the electrode pins 3 and 4 are connected to a power supply (not shown).
[0020]
This electric igniter 15 is manufactured as follows.
First, after the glass ball 2 is melted and penetrated through the electrode pins 3 and 4, it is cooled and fixed, and a heating resistance wire 1 such as a nichrome wire is cross-linked to the tips of the electrode pins 3 and 4. Next, the heating resistance wire 1 is inserted into the glass tube 9, and the glass ball 2 is fused and sealed to one end of the glass tube 9 in an argon gas atmosphere. Thereafter, the igniting charge 7 is filled into the glass tube 9 in the form of powder or slurry so as to be in contact with the heating resistance wire 1, and after being dried, a heat insulating material 11 is filled on the igniting charge 7. The other end is sealed by fusing under an argon gas atmosphere.
[0021]
Further, the electric igniter 15 can be manufactured as follows.
First, after the glass ball 2 is melted and penetrated through the electrode pins 3 and 4, it is cooled and fixed, and a heating resistance wire 1 such as a nichrome wire is cross-linked to the tips of the electrode pins 3 and 4. Next, after cutting the long glass tube into a certain length, one end is fused and sealed to produce a glass tube 9. Next, the ignition charge 7 is filled in powder or slurry form from the other end of the glass tube 9, the heating resistance wire 1 is inserted so as to be in contact with the ignition charge 7, and the other end of the glass tube 9 and the glass ball 2 are placed in an argon gas atmosphere. Fuse under and seal.
[0022]
The electric igniter 10 (see FIG. 1) and the electric igniter 15 (see FIG. 2) operate as follows. When the electric pins 10 and 15 are energized, the electric igniters 10 and 15 heat the heating resistance wire 1 and ignite the igniting charge 7 to ignite.
[0023]
The electric igniter 10 and the electric igniter 15 are usually used with a lead wire (not shown), but are also used as a socket type electric igniter by attaching a socket 12 (see FIG. 3) or 13 (see FIG. 4). .
[0024]
More specifically, the heat-generating resistance wire 1 is a Ni-Cr wire type 1 (diameter: 40 μm, length: 2 mm, resistance: about 1.5Ω), and the igniting agent 7 is a stiffener-based, rodane-lead, DDNP (diazo The electric igniter 10 and the electric igniter 15 were manufactured using the respective (dinitrophenol) system, and the ignition current when energized for 3 milliseconds and the non-ignition current immediately before ignition when energized for 10 seconds were measured. For comparison, the ignition current and the non-ignition current were measured for the pressurized electric igniter 20 (see FIG. 5) in the same manner. Table 1 shows the results.
[0025]
[Table 1]

[0026]
As shown in Table 1, the electric igniters 10 and 15 of the present invention performed better than the pressurized electric igniter 20.
[0027]
【The invention's effect】
As described in detail above, the electric igniter manufactured by the method of the present invention can increase the production efficiency, can be mass-produced at a low manufacturing cost, and can secure long-term performance with high airtightness. . Further, since glass is used to seal the igniter, electric igniters of various sizes and shapes can be manufactured as required.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view of a main part showing an embodiment of an electric igniter to which the present invention is applied.
FIG. 2 is a cross-sectional perspective view of a main part showing another embodiment of the electric igniter to which the present invention is applied.
FIG. 3 is an external view showing a socket-type electric igniter using the electric igniter to which the present invention is applied.
FIG. 4 is an external view showing another socket-type electric igniter using the electric igniter to which the present invention is applied.
FIG. 5 is a sectional view showing an example of a conventional electric igniter.
[Explanation of symbols]
1.25 is a heating resistance wire, 2 is a glass ball, 3.4 is an electrode pin, 6.9 is a glass tube, 7 is an igniter, 8 is a resin, 10 is an electric igniter, 10 is a heat insulator, and 11 is a heat insulating material. , 12 and 13 are sockets, 21 and 22 are electrode pins, 23 is an insulator, 24 is a metal case, and 26 is an ignition charge.

Claims (6)

An electric igniter which has a heating resistance wire inside a glass tube, and is filled with an igniter in contact with the heating resistance wire, wherein one end of the glass tube is coated with a resin, and a glass ball is provided at the other end. An electric igniter characterized by being fused and sealed, and wherein the heating resistance wire is cross-linked to two electrode pins penetrating the glass ball. An electric igniter filled with an igniter in contact with the heat-generating resistance wire inside of a glass tube sealed at one end, and a glass ball is fused and sealed at the other end. An electric igniter characterized in that the heating resistance wire is cross-linked to two electrode pins penetrating the glass ball. An electric igniter that has a heating resistance wire inside a glass tube sealed at one end, is in contact with the heating resistance wire, and has an igniting charge, and a heat insulating material filled and laminated on the igniting charge. An electric igniter characterized in that a glass ball is fused to an end and hermetically sealed, and the heating resistance wire is cross-linked to two electrode pins penetrating the glass ball. After the two electrode pins are fused through the glass ball and fixed, the heating resistance wire is cross-linked to the electrode pin, the heating resistance wire is inserted from one end of the glass tube, and the one end and the glass ball are connected. After being fused and sealed, the glass tube is brought into contact with the heating resistance wire and filled with an igniter, and the other end of the glass tube is covered with a resin and hermetically sealed. Production method. After fixing the two electrode pins by fusing and penetrating the glass ball, a heating resistance wire is cross-linked to the electrode pins, and a glass tube whose one end is sealed is filled with an igniter, and the heating tube is filled in the glass tube. A method for manufacturing an electric igniter, comprising: inserting a resistance wire into contact with the igniter; inserting the resistance wire; sealing the other end of the glass tube with the glass ball; After the two electrode pins are fused through the glass ball and fixed, the heating resistance wire is cross-linked to the electrode pin, the heating resistance wire is inserted from one end of the glass tube, and the one end and the glass ball are connected. After sealing by fusion, the heating tube is brought into contact with the heating resistance wire to fill the igniting charge, laminated on the igniting charge and filled with a heat insulating material, and the other end of the glass tube is fused. A method for manufacturing an electric igniter, comprising:

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