JPH08247461A - Electrical ignition device and its manufacturing method - Google Patents

Abstract

PURPOSE: To provide an electrical ignition device in which its yield is high, its manufacturing cost is low, it has a high air-tightness and its performance can be kept for a long period of time and to provide its manufacturing method. CONSTITUTION: An electrical ignition device 10 is constructed such that a heat generating resistor wire 1 is installed in a glass pipe 6 and ignition chemicals are filled in contact with the heat generating resister wire 1. One end of the glass pipe 6 is covered by a resin 8 and a glass ball 2 is melted, adhered to the other end of the glass pipe and sealingly closed to it and then the heat generating resister wire 1 is applied over two electrode pins 3 and 4 passed through the glass ball 2. A method for manufacturing the electrical ignition device 10 is performed such that the two electrode pins 3 and 4 are melted, adhered and passed through the glass ball 2 and fixed there, thereafter the heat generating resister wire 1 is applied over the electrode pins 3 and 4, the heat generating resister wire 1 is inserted into one end of the glass pipe 6 so as to adhere one end and the glass ball 2 to seal them, and then an ignition chemical 7 is filled while being contacted with the heat generating resister wire 1 within the glass pipe 6 and then the other end of the glass pipe 6 is sealingly covered by the resin 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric igniter for igniting various pyrotechnic products and a method for manufacturing the same.

[0002]

2. Description of the Related Art An electric igniter is used as a device which requires a large amount of power instantaneously, for example, a device for igniting a pretensioner of a vehicle seat belt or a drive source of an airbag.

There are mainly two types of electric igniters, a compression type and an ignition ball type. As shown in FIG. 5, the compression type electric igniter 20 has an insulator 23 through which the electrode pins 21 and 22 penetrate.
The metal cap 27 is sealed by laser welding or caulking in the metal case 24 fitted with. Inside the electric igniter 20, the exothermic resistance wire 25 is bridged to the tips of the electrode pins 21 and 22, and the ignition charge 26 is pressed. In the electric igniter 20, the heating resistance wire 25 is heated by energizing the electrode pins 21 and 22, and the ignition charge 26 is ignited.

Further, in the electric igniter of the ignition ball type, an ignition ball having a heating resistance wire coated with ignition powder is housed in a metal case,
A resin embolus having two electrode pins penetrating through the metal case is adhered with an adhesive or caulked and sealed. Inside the metal case, the heating resistance wire is bridged to the two electrode pins. This electric igniter is ignited by energizing the electrode pins.

[0005]

However, in the electric igniter 20 of the compression type, the heating resistance wire 25 is connected to the electrode pin 21.
When cross-linking to 22, it is required to have high accuracy when aligning and welding the heating resistance wire 25, and smoothness of the welding surface of the electrode pins 21 and 22 is also required, so polishing when fixed to the insulator 23. Inevitably, the production efficiency was lowered and the manufacturing cost was increased.

When the metal cap 27 is sealed to the metal case 24 by laser welding, the ignition charge 26 (ignition temperature 150
(~ 300 ℃) is necessary to have a plate thickness and shape that will not ignite,
Special equipment was also required for laser welding.
When caulking and sealing, it was difficult to ensure airtightness and it was necessary to use it together with a sealing material.

The ignition pin type electric igniter has an electrode pin 21.
・ To prevent air bubbles from being generated when applying 20 to 30 mg of ignition powder kneaded with a binder so as to wrap the heating resistance wire cross-linked with 22, or to completely wrap the heating resistance wire and to keep the shape and size constant. It required a considerable amount of skill, and automation was difficult, which caused a rise in manufacturing costs. When a resin emboli is adhered to the metal case with an adhesive or by caulking and sealing, it is difficult to ensure airtightness due to deterioration of the resin.
We could not secure the performance for a long time.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric igniter capable of increasing production efficiency, low manufacturing cost, high airtightness, and ensuring long-term performance, and a manufacturing method thereof. To aim.

[0009]

As shown in FIG. 1, an electric igniter 10 of the present invention made to achieve the above object has a heating resistance wire 1 inside a glass tube 6 to generate heat. An electric igniter 10 in contact with the resistance wire 1 and filled with an ignition charge 7.
The one end of the glass tube 6 is covered with the resin 8 and the other end is fused and sealed with the glass ball 2, and the heating resistance wire 1 is attached to the two electrode pins 3 and 4 penetrating the glass ball 2. It is cross-linked.

As shown in FIG. 2, an electric igniter 15 of the present invention made to achieve the above-mentioned object has a heating resistance wire 1 inside a glass tube 9 of which one end is sealed. An electric igniter 15 that is in contact with the resistance wire 1 and is filled with the ignition charge 7.
And, the glass ball 2 is fused and sealed at the other end, and the heating resistance wire 1 penetrates the glass ball 2 to form the two electrode pins 3 and 4
Is cross-linked.

As shown in FIG. 2, an electric igniter 15 of the present invention made to achieve the above-mentioned object has a heating resistance wire 1 inside a glass tube 9 whose one end is sealed. An electric igniter 15 which is in contact with the resistance wire 1 and is laminated on the ignition charge 7 and is filled with a heat insulating material 11, and a glass ball 2 is fused and sealed at the other end to generate a heat resistance wire. 1 is a glass ball 2
It is bridged to the two electrode pins 3 and 4 penetrating through.

The method of manufacturing the electric igniter 10 of the present invention, which has been made to achieve the above-mentioned object, is as shown in FIG.
After fixing the two electrode pins 3 and 4 to the glass ball 2 by fusion bonding, the heating resistance wire 1 is bridged to the electrode pins 3 and 4, and the heating resistance wire 1 is inserted from one end of the glass tube 6, After one end and the glass ball 2 are fused and sealed, the glass tube 6 is brought into contact with the heating resistance wire 1 and filled with the ignition charge 7, and the other end of the glass tube 6 is covered with the resin 8. Seal it.

The method of manufacturing the electric igniter 15 of the present invention, which has been made to achieve the above-mentioned object, is as shown in FIG.
After the two electrode pins 3 and 4 are fused and fixed to the glass ball 2, the heating resistance wire 1 is bridged to the electrode pins 3 and 4, and the igniter 7 is attached to the glass tube 9 having one end sealed. And the heating resistance wire 1 is inserted into the glass tube 9 in contact with the ignition charge 7,
The other end of the glass tube 9 and the glass ball 2 are fused and sealed.

The method of manufacturing the electric igniter 15 of the present invention, which has been made to achieve the above-mentioned object, is as shown in FIG.
After fixing the two electrode pins 3 and 4 through the glass ball 2 by fusion bonding, the heating resistance wire 1 is bridged to the electrode pins 3 and 4, and the heating resistance wire 1 is inserted from one end of the glass tube 9. After fusing and sealing one end and the glass ball 2, the glass tube 9 is brought into contact with the heating resistance wire 1 and filled with the ignition charge 7, laminated on the ignition charge 7 and filled with the heat insulating material 11. Then, the other end of the glass tube 9 is fused and sealed.

[0015]

When an electric igniter is manufactured by the method of the present invention,
Since there is no step of pressing the igniting agent and a step of applying the igniting agent to the heating resistance wire, and the igniting agent can be sealed by fusion of glass or coating of resin, laser welding is not necessary. Therefore, the electric igniter can be mass-produced at low cost.

Further, the melting point of glass is 700 ° C., which is lower than the melting point of metals of 1300 to 1500 ° C., and its thermal conductivity is low, and therefore it is suitable for sealing the ignition charge, which has a high risk of ignition.

[0017]

EXAMPLES Examples of the present invention will be described in detail below. FIG. 1 is a cross-sectional perspective view of essential parts showing an embodiment of an electric igniter 10 to which the present invention is applied. The electric igniter 10 is a glass tube 6
An ignition charge 7 is filled in the interior of the battery, and the heating resistance wire 1 is housed in contact with the ignition charge 7. The glass tube 6 is coated with resin 8 at one end and sealed, and the glass ball 2 is provided at the other end.
Are fused and sealed to maintain airtightness. Electrode pins 3 and 4 penetrate the glass beads 2 and are fusion-bonded and fixed, and a heating resistance wire 1 is bridged to the tips of the electrode pins 3 and 4. The other ends of the electrode pins 3 and 4 are connected to a power source (not shown).

The electric igniter 10 is manufactured as follows. First, the glass ball 2 is melted and the electrode pin 3
4 is penetrated, then cooled and fixed, and the exothermic resistance wire 1 such as a nichrome wire is bridged 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 at one end of the glass tube 6 in an argon gas atmosphere. After that, the glass tube 6 is filled with an ignition charge 7 in powder or slurry form so as to be in contact with the heating resistance wire 1 and dried, and then the other end of the open glass tube 6 is coated with a resin 8 and hermetically sealed.

FIG. 2 shows an electric igniter 15 to which the present invention is applied.
FIG. 4 is a cross-sectional perspective view of an essential part showing the embodiment of FIG. Electric igniter 15
The ignition charge 7 is placed inside the glass tube 9 whose one end is sealed.
And the heat insulating material 11 is filled in the ignition charge 7 in a laminated manner, and the heating resistance wire 1 is stored in contact with the ignition charge 7.
The other end of the glass tube 9 is hermetically sealed by the glass beads 2 being fused and kept airtight. Electrode pins 3 and 4 penetrate the glass ball 2 and are fused and fixed.
A heating resistance wire 1 is bridged at the tip of the. Electrode pin 3
The other end of 4 is connected to a power source (not shown).

The electric igniter 15 is manufactured as follows. First, the glass ball 2 is melted and the electrode pin 3
4 is penetrated, then cooled and fixed, and the exothermic resistance wire 1 such as a nichrome wire is bridged to the tips of the electrode pins 3 and 4. Next, the heating resistance wire 1 is inserted into the glass tube 9, and a glass ball 2 is fused and sealed at one end of the glass tube 9 under an argon gas atmosphere. After that, the igniting charge 7 is filled into the glass tube 9 in a powder or slurry form so as to be in contact with the heating resistance wire 1 and dried, and then the insulating material 11 is filled on the igniting charge 7 to open the glass tube 9. The other end is fused and sealed in an argon gas atmosphere.

The electric igniter 15 can also be manufactured as follows. First, the glass beads 2 are melted to pass through the electrode pins 3 and 4, then cooled and fixed, and the exothermic resistance wire 1 such as a nichrome wire is bridged to the tips of the electrode pins 3 and 4. Next, after cutting a long glass tube into a certain length, one end is fused and sealed to manufacture the glass tube 9. Next, the ignition charge 7 is filled in a powder or slurry form from the other end of the glass tube 9, the heating resistance wire 1 is inserted in contact with the ignition charge 7, and the other end of the glass tube 9 and the glass ball 2 are filled with an argon gas atmosphere. Fuse down and seal.

The electric igniter 10 (see FIG. 1) and the electric igniter 15 (see FIG. 2) operate as follows. When the electrode pins 3 and 4 are energized, the electric igniter 10 and the electric igniter 15 heat the heating resistance wire 1 to ignite and ignite the ignition charge 7.

The electric igniter 10 and the electric igniter 15 are
Normally used for lead wire (not shown), socket 12
It can also be used as a socket-type electric igniter by attaching (see FIG. 3) or 13 (see FIG. 4).

Specifically, the heating resistance wire 1 is made of Ni-C.
r-line type 1 (diameter: 40 μm, length: 2 mm, resistance: about 1.5Ω), stiffnate type, rhodan lead type, DDNP (diazodinitrophenol) type igniter 7 are used as electric igniters. 10 and the electric igniter 15 were manufactured, 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 similarly measured for the compression type electric igniter 20 (see FIG. 5). Table 1 shows the results.

[0025]

[Table 1]

As shown in Table 1, the electric igniters 10 and 15 of the present invention performed better than the compression type electric igniter 20.

[0027]

As described above in detail, the electric igniter manufactured by the method of the present invention can increase production efficiency, can be manufactured at low cost and can be mass-produced, and has high airtightness and long life. Period performance can be secured. Further, since glass is used to seal the ignition charge, electric igniters of various sizes and shapes can be manufactured as required.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of essential parts showing an embodiment of an electric igniter to which the present invention is applied.

FIG. 2 is a cross-sectional perspective view of an essential 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 cross-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 ignition charge, 8 is resin, 10.
15 and 20 are electric igniters, 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)

[Claims] 1. An electric igniter having a heating resistance wire inside a glass tube and being filled with an ignition charge in contact with the heating resistance wire, wherein one end of the glass tube is coated with a resin, and the other. An electric igniter characterized in that a glass ball is fused and sealed at an end, and the heating resistance wire is cross-linked to two electrode pins penetrating the glass ball. 2. An electric igniter having a heating resistance wire inside a glass tube whose one end is sealed, and an ignition charge being filled in contact with the heating resistance wire, wherein a glass ball is provided at the other end. An electric igniter characterized in that the heating resistance wire is fused and sealed, and the heating resistance wire is bridged to two electrode pins penetrating the glass ball. 3. An electric igniter which has a heating resistance wire inside a glass tube whose one end is sealed, is in contact with the heating resistance wire, and is filled with an igniting charge and a heat insulating material laminated on the ignition charge. And
An electric igniter characterized in that a glass ball is fused and sealed at the other end, and the heating resistance wire is bridged to two electrode pins penetrating the glass ball. 4. The two electrode pins are fused and penetrated into a glass ball and fixed, and then a heating resistance wire is bridged to the electrode pin, and the heating resistance wire is inserted from one end of the glass tube to After being fused and sealed with the glass beads, the glass tube is brought into contact with the heating resistance wire and filled with an ignition charge, and the other end of the glass tube is covered with a resin for sealing. For manufacturing an electric igniter. 5. After fixing the two electrode pins by fusion-penetrating the glass balls, a heating resistance wire is bridged to the electrode pins, and a glass tube whose one end is sealed is filled with an ignition charge. A method for manufacturing an electric igniter, characterized in that the heating resistance wire is inserted into a glass tube in contact with the ignition charge, and the other end of the glass tube and the glass ball are fused and sealed. 6. After fixing the two electrode pins by fusion-penetrating and fixing the glass balls, a heating resistance wire is bridged to the electrode pins, the heating resistance wire is inserted from one end of the glass tube, and one end of the glass tube is inserted. After fusing and sealing with the glass beads, the heating resistance wire is brought into contact with the inside of the glass tube to fill it with an ignition charge, which is laminated on the ignition charge and filled with a heat insulating material. A method for manufacturing an electric igniter, characterized in that the other end is fused and sealed.