CZ303013B6 - Sealed electric plastic initiator for electrical pyrotechnic systems - Google Patents

Abstract

In the present invention, there is disclosed a sealed electric plastic initiator for electrical pyrotechnic systems comprised of an electrical capsule (1) anchored within a carrier (2) provided with an antistatic protective element (3). The whole unit is covered from above with a cover cup (4) accommodating a flash-out mixture (5) while the lower part thereof is embedded in a fixing material (6). The initiator of the present invention preferably has a sealing element (7) disposed between the carrier (2) and the fixing material (6). The material of the electrical capsule (1) carrier (2) is mostly thermoplastic or glass. The sealing element (7) is represented by either an epoxy or silicon or another varnish-based layer or a weld of the cover cup (4) and the carrier (2) sleeve. The flash-out mixture (5) is preferably based on a pyrotechnical mixture with autoinitiation properties. The fixing material (6) is preferably polyphenylsulfide.

Description

Hermetized electric plastic initiator for electrical pyrotechnic systems

Technical field

The invention relates to a new type of hermetized electric squib type electric initiator for gas generators intended mainly for seat belt pretensioners and airbags in automobiles, but also for other related applications.

BACKGROUND OF THE INVENTION

As is known in the art, inexpensive pyrotechnic components for electroprotechnical systems intended for the automotive industry are mostly based on the known construction of a so-called pill or plastic squib, which are not considered to be sufficiently resistant for use in, for example, airbag inflators. ). The main disadvantages of conventional plastic initiators are low resistance to atmospheric humidity, fragmentation at function and lower safety electrical parameters (safe current, ESD resistance ..). These products also have a lower back pressure resistance of the body and less heat resistance due to the use of less heat resistant plastics.

In addition to these pills or plastic squibs, GTMS initiators (glass to metal sealed) with high tightness and a sufficient level of the above mentioned critical parameters are also known, but their application is in many cases hampered by the high cost.

The object of the invention is to provide a plastic squib based on a sufficiently high-quality electric initiator for electrical pyrotechnic systems while maintaining cost-effectiveness.

SUMMARY OF THE INVENTION

These disadvantages and drawbacks of the above-mentioned electric initiators for said electropyrotechnical applications are largely eliminated by the hermetically sealed electric plastic initiator for the electric pyrotechnic systems of the invention. SUMMARY OF THE INVENTION The present invention is a metallized electric plastic initiator for electrical pyrotechnic systems consisting of an electric pill anchored in a carrier provided with an antistatic protective element and having a cover cup at the top in which the elevation component is located and the lower part surrounded by a fixative .

The hermetically-sealed electric plastic initiator according to the invention preferably has a sealing element between the carrier and the fixative. The material of the electric pellet carrier is usually thermoplastic or glass. The sealing element is either an epoxy or silicone or other lacquer-based layer, or a weld of a rat cup to a carrier sleeve. The whisk composition is preferably based on a pyrotechnic composition having auto-initiating properties. The fixing compound is preferably polyphenylene sulfide.

The function of an antistatic protective element is most often performed either by a safety insulating spark gap, a safety insulating cup or an electrostatically conductive layer. The material of the metal contacts of the electrical pellet is gold-plated stainless steel or copper alloy.

The advantages of the hermetized electric plastic initiator according to the invention are based on the fact that the known, inexpensive and less durable type of electric pellet is provided with a suitable carrier and inserted into a cover cup with a hinged fold and surrounded by a sealing compound (thermoplastic). thereby forming a compact closed plastic initiator. Compared to comparable solutions used so far, the resulting unit shows significantly higher hermeticity, higher resistance to electrostatic discharges (ESD), higher resistance to the so-called bonfire test (behavior in the event of a vehicle fire), higher safety during operation (prevention of formation). fragments) and higher moisture resistance while reducing the price of the product.

BRIEF DESCRIPTION OF THE DRAWINGS

Specific embodiments of the hermetized electric plastic initiator of the invention are shown in the accompanying drawings, in which:

FIG. 1 shows a hermetized electric plastic initiator according to example 1, in axial section

FIG. 2 shows a hermetized electric plastic initiator according to example 2, in axial section

FIG. 3 is a hermetized electric plastic initiator according to example 3, axial section

DETAILED DESCRIPTION OF THE INVENTION

The following examples illustrate a particular embodiment of a hermetized electric plastic initiator for electrical pyrotechnic systems.

Example 1

In the design of FIG. 1, an electric pellet of classical type with a plastic clip and L-shaped contacts is subsequently sprayed with a layer of glass-filled thermoplastic PBT poles into a carrier 2 with an antistatic protective element 3 formed by a safety spark gap to prevent ESD discharges. pyrotechnic composition. The assembly is inserted into the cover cup 4, here of aluminum and with a chopped bottom, with a dose of TiHPP based elevation style 5. The cover cup 4 is sealed with a sealing element 7, here a layer of epoxy varnish, and the whole is sprayed with a fixation compound 6, here a thermoplastic polyphenylene sulphide (PPS) compound.

Example 2

In the design according to FIG. 2, the plastic squib electric pellet 1 is coated with a carrier layer of glass-filled polyphenylene sulphide PPS in the form of a carrier 2 with an antistatic protective element 3 formed by a ESD discharge safety cup in the area of pyrotechnic compositions. The whole is inserted into the cover cup 4, here of aluminum with a chopped bottom, with a dose of a boron and potassium nitrate pitch 5. The cover cup 4 is sealed with a sealing element 7, here a layer of silicone lacquer, and the whole is sprayed with a fixing material 6, here a thermoplastic polyphenylene sulphide (PPS) material containing glass to increase strength.

Example 3

In the design according to FIG. 3, the electric pellet 1 is sealed into a carrier layer of glass in a holder in the form of a carrier 2 with an antistatic protective element 3 formed by a safety insulating spark gap against ESD discharges in the area of pyrotechnic compositions. The assembly is inserted into a cover cup 4, here a stainless steel cup with a chopped bottom with a dose of a vertical-style composition 5 with an auto-initiating effect. The cover cup 4 is sealed with a sealing element 7, here a resistance hermetic weld, and the whole is sprayed with a fixation material 6, here a composite thermoplastic polyamide (PA) material filled with glass to increase strength.

-2GB 303013 B6

Industrial applicability

The hermetized electric plastic initiator according to the invention finds particular application in the automotive industry (gas generators for seat belt pretensioners, gas generators for airbag bags, power cable cutters, pyropatrons for fire extinguishers, etc.). However, it will also be useful in other areas - wherever robust and affordable initiators for electrical pyrotechnic systems are used.

Claims (8)

PATENT CLAIMS Hermeticized electric plastic initiator for electrical pyrotechnic systems, characterized in that it consists of an electric pill (1) anchored in a carrier (2) provided with an antistatic protective element (3) and this assembly is provided with a cover cup (4) from above. and a lower part is surrounded by a fixing mass (6). Hermetic electrical plastic initiator for electrical pyrotechnic systems according to claim 1, characterized in that a sealing element (7) is arranged between the support (2) and the fixing compound (6). Hermetic electrical plastic initiator for electrical pyrotechnic systems according to claim 1, characterized in that the material of the support (2) of the electric pellet (1) is a thermoplastic. Hermetic electrical plastic initiator for electrical pyrotechnic systems according to claim 1, characterized in that the material of the support (2) of the electric pellet (1) is glass. Hermetized electric plastic initiator for electrical pyrotechnic systems according to claims 1 and 2, characterized in that the sealing element (7) is a layer based on epoxy or silicone lacquer. Hermetic electrical plastic initiator for electrical pyrotechnic systems according to claims 1 and 2, characterized in that the sealing element (7) is a weld of the cover cup (4) to the carrier sleeve (2). A hermetically-sealed electric plastic initiator for electrical pyrotechnic systems according to claim 1, characterized in that the elevator component (5) is based on a pyrotechnic composition having auto-initiating properties. Hermeticized electric plastic initiator for electrical pyrotechnic systems according to claim 1, characterized in that the fixing material (6) is polyphenylene sulphide.