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Electric ignition pipe for gas generator and its ignition method

A technology of gas generators and electric ignition tubes, which is applied to belt tighteners, vehicle components, pedestrian/passenger safety arrangements, etc., and can solve the problem of difficult guarantee of safety and reliability, failure of airbags or seat belt pretensioners , complex manufacturing process and other issues, to achieve high reliability, reduce the probability of misfired ignition, and simple production process

Active Publication Date: 2010-05-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the bridge wire or bridge band resistance 435 is generally 1-4 ohms, when a 12-volt car power supply is applied to the resistance, the current will easily exceed the maximum safe current of 400mA, causing the agent to ignite and cause false explosion.
Moreover, the bridge wire itself is a very thin resistance wire, which is easy to break during the assembly process of the electric ignition device or during the driving vibration of the car, causing the failure of the entire airbag or seat belt pretensioner
Therefore, the safety and reliability of the existing gas generator electric ignition device are difficult to be guaranteed, and the manufacturing process is relatively complicated

Method used

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  • Electric ignition pipe for gas generator and its ignition method
  • Electric ignition pipe for gas generator and its ignition method
  • Electric ignition pipe for gas generator and its ignition method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see image 3 , the electric ignition tube of the present invention includes an electrode plug 11, and the electrode plug 11 is composed of a first core electrode 112, a second core electrode 113 and an insulating base 111. It also includes a housing 12, which is provided with an opening, and The opening of the housing 12 is provided with an upper cover 14, and the surface of the seal between the opening of the housing 12 and the upper cover 14 is coated with lacquer; the housing 12 is sleeved on the insulating base 111 of the electrode plug 11, and the The first core electrode 112 and the second core electrode 113 of the electrode plug 11 are placed in the inner cavity of the housing 12, and are sealed with shellac paint at the contact between the housing 12 and the electrode plug 11. The upper cover 14 is soft insulation Inert material, preferably a phenolic resin sheet. The inner cavity of the housing 12 is tightly pressed with a conductive agent 13; the conductive ag...

Embodiment 2

[0025] see Figure 4 , the electric ignition tube of the present invention includes an electrode plug 21, the electrode plug 21 is composed of a first core electrode 212 and an insulating base 211; it also includes a housing 22, an opening is provided on the housing 22, and an upper cover is provided at the opening of the housing sheet 24, and coat the surface of the seal between the opening of the casing 22 and the upper cover sheet 24 with lacquer; the casing 22 is set on the insulating base 211 of the electrode plug 21, and the Contacts are sealed with shellac. The upper cover sheet 24 is a soft insulating and inert material, preferably a phenolic resin sheet. The conductive agent 23 is tightly pressed into the inner cavity of the housing 22; the conductive agent 23 is made by uniformly doping and mixing conductive substances in common ignition powder; the conductive substance is preferably powdered graphite. The proportion of the conductive substance in the conductive ag...

Embodiment 3

[0027] Please combine Figure 5 , Image 6 , Figure 7 As shown, the electric ignition tube of the present invention includes an electrode plug, and the electrode plug is composed of a first core electrode 312, a second core electrode 313 and an insulating base 311; it also includes a casing 32 and a cover sheet, and the casing 32 is insulated Sleeve, the two sides of the insulating sleeve are provided with small protrusions, and the cover sheet includes two pieces of left cover sheet 35 and right cover sheet 36, such as Figure 8 As shown, there are deep rice-shaped grooves 351 on it, and hooks are provided at both ends of the cover; the hooks of the cover cooperate with the small protrusions of the insulating sleeve and are sealed on both sides of the insulating sleeve. , and apply nitrocellulose varnish to seal the seal. The left cover sheet 35 and the right cover sheet 36 are conductive materials, preferably copper cover sheets. And the hooks at one end of the two cove...

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PUM

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Abstract

The invention discloses an electric ignition pipe of a gas generator and an ignition way of the electric ignition pipe. An ignition powder in the electric ignition pipe is an electric powder in whichan electric substance is mixed. The replacement of an ignition charge by the electric powder cancels a traditional bridging fibril or a bridging belt between two electrodes and does not need a complexbridging fibril welding technics in addition to improving the resistance between the two electrodes and reducing the ratio of the wrong burst of ignition for an air bag, besides the security of the maintenance and servicing is increased. The control of the ignition sensitivity can be realized by changing the distance of the electrodes and the proportion of the electric substance in the electric powder and adjusting the resistance between the electrodes.

Description

【Technical field】 [0001] The invention relates to an ignition device for a gas generator of a vehicle safety airbag or a safety belt pretensioner. 【Background technique】 [0002] At present, the gas generator of the vehicle airbag or seat belt pretensioner widely used in the market is a gas generating device that can generate a large amount of gas in an instant after it is energized. Currently the most commonly used is the pyrotechnic gas generator, such as figure 1 As shown, it includes an upper shell 40, a lower shell 41, an ignition powder 42, an electric ignition tube 43, and a gas generating agent 44. The gas-generating agent 44 is a chemical material that can generate a large amount of gas after burning, and is generally a pyrotechnic agent. The ignition powder 42, the electric ignition tube 43, and the gas generating agent 44 are sealed between the upper shell 40 and the lower shell 41. The two sides of the electric ignition tube 43 are the ignition powder 42, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R21/264B60R22/46
Inventor 魏德贤吴寒杰
Owner BYD CO LTD
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