WO2010055088A1

WO2010055088A1 - Pyrotechnic igniter

Info

Publication number: WO2010055088A1
Application number: PCT/EP2009/065044
Authority: WO
Inventors: Erich Muskat
Original assignee: Ruag Ammotec Gmbh
Priority date: 2008-11-13
Filing date: 2009-11-12
Publication date: 2010-05-20
Also published as: DE102009052660A1; DE102009052578A1; DE102009052660B4; DE102009052753A1; WO2010055086A1; WO2010055089A1; DE102009052753B4; DE102009052578B4

Abstract

The invention relates to a pyrotechnic igniter for igniting pyrotechnic propellant charges or explosives, comprising a flame-directing tube 12 which is used for uniformly igniting the propellant charge, is connected to a cylindrical breech piece 1 and can be screwed into a cartridge sleeve, wherein the flame-directing tube 12 and the one cylindrical breech piece 1 have provided between them a nozzle piece 3 which fixes the ignition element 16 in the breech piece 1 and has at least a first nozzle 39, which ensures the connection to the transmission charge 49 arranged in the flame-directing tube 12.

Description

Pyrotechnic igniter

The invention relates to a pyrotechnic igniter for the ignition of pyro-technical propellant charges or explosives.

From the documents US 2,446,187 and DE 196 31 185 A1 propellant charge igniter (TLANZ) for cartridged ammunition are known, which describe the design of the flame guide tube used for a uniform ignition of the propellant charge. Furthermore, from the document DE 195 44 823 a propellant charge igniter is known, which consists of an ignition charge and at least two longitudinally adjacent booster charges.

The pyrotechnic lighter according to the invention is explained in more detail below with reference to four figures and comprises a cylindrical bottom piece 1 with an external thread 18 is screwed into a stub sheath made of a special, high-strength steel. The TLANZ itself is thus screwed into the propellant charge of the armor ammunition.

For attachment in the active element, the bottom piece 1 has a peripheral projection 19, which rests on a matched shoulder in the active element. For sealing an O-ring 6 is arranged below the projection 19. In the bottom piece 1, two blind holes 20, 21 are introduced, wherein the first blind bore 20 adjacent to the closed end 22 of the bottom piece 1 and the second blind bore 21 with a larger diameter than the first blind bore 20 adjacent to the open end 23. The blind holes 20, 21 merge into each other, wherein the transition forms a bearing surface 24. To facilitate the screwing 22 recesses 26 are introduced for an engagement tool in the end wall of the closed end. In the first blind bore 20, a pole piece 14 is inserted in an insulating sleeve 15 from volcanic fever. Vulkanfieber (Hydratellulose) is electrically non-conductive. This pole piece 14 in the insulating sleeve 15 fills the first blind bore 20 radially completely. The pole piece 14 in the insulating sleeve 15 is T-shaped, wherein a central extension 27 engages in a central bore 28 in the end wall 25. The central extension 27 is surrounded by the insulating bushing 51. This is used to isolate the outwardly projecting extension 27 of the pole piece relative to the bottom piece 1. As the material, a high density polyethene (HDPE), another plastic or paper with electrically insulating property can be used. This bore 28 pierces the end face of the closed end 22. The front end 29 of the extension 27 has a distance of 0.3 to 0.9 mm to the plane of the end wall of the closed end 22. This front end 29 of the extension 27 is not surrounded as the sole surface of the insulating sleeve 15 and the insulating sleeve 51 and is therefore not isolated.

In the first blind bore 20 a Anzündhütchenaufnahme 17 is used, which radially fills the first blind bore 20 and electrically separated by the insulating 52 on the pole piece 14 is seated. The insulating disk may e.g. consist of polytetrafluoroethylene (PTFE). The primer receptacle 17 projects slightly out of the first blind bore 20 into the second blind bore 21, wherein when force is applied to the primer receptacle 17 it is pressed onto the pole piece 14 and thereby onto the inside of the end wall 25. As a result, the insulating sleeve 15 is pressed into the insulating bushing 51, whereby a seal is made.

In the Anzündhütchenaufnahme 17 from the pole piece 14 end facing from a blind bore 35 is introduced, in which an electric ignition element 16 is inserted. The outer wall of the ignition element 16 forms an electrical pole of the ignition element 16. The other electrical pole forms a pole pin 36, which protrudes from the blind bore 35 and engages in a pole bore 37 in the pole piece 14 such that the pole pin 36 is in electrical contact with the pole piece 14. The pole pin 36 is secured in the ignition element 16 in such a way that it is electrically connected to it only via an electrical resistance bridge in the interior of the ignition element 16. When a voltage is applied to the end 29 of the pole piece 14 on the one hand and to the bottom piece 1 on the other hand, and a current flows through the resistance bridge, the ignition element 16 is ignited by the electrical heating and an ignition jet shoots from the ignition element 16 through a bore 38 in the direction to a nozzle element 3.

The force action just described on the Anzündhütchenaufnahme 17 is indirectly via this nozzle member 3, which may have a first cylindrical threaded portion 30 and a second cylindrical threaded portion 31. The threaded parts 30 and 31 carry external threads 32a, 32b. The threaded portion 30 is screwed or inserted into the second blind bore 21 and is located on the front side on the support surface 24. Inside the first threaded part 30, a blind bore 34 is introduced from the end facing the ignition cap 17 from a recess 50. In this blind bore 34 arranged in a loading container 25 Anzündverstärkungsladung 2 is used. The loading container 25 consists of a cup with a flared lid. The lid of the loading container 25 rests on the ignition pickup receptacle 17, wherein the flanged lid edge of the ignition boost charge 2 is held by the recess 51. The loading container 25 of the ignition boost charge 2 may consist, for example, of anodized aluminum (Al) with a thickness of between 0.1 mm and 1.0 mm. It can also consist of combustible, energetic or consumable material. The length of the loading container 25 and thus the mass of the Anzündverstärkungsladung 2 can be adapted to the internal ballistic requirements. The lid of the ignition boost charge 2 may also consist of anodized AI, for example. The lid, which is the electric - A -

Ignition element 16, a bore of e.g. 2 to 6 mm. This hole is preferably closed with a thin single-sided adhesive tape made of plastic. The ignition flame from the electric ignition element 16 breaks through or burns the adhesive tape much more easily than the cover of the metallic loading container 25 of the ignition boosting charge 2. This achieves a faster conversion of the ignition boosting charge 2 and a faster ignition of the transfer charge 49 of the TLANZ and the propellant charge of the cartridge. During the ignition process, the ignition jet, starting from the ignition element 16, shoots through the bore 38 and the lid of the loading container 25 into the ignition boost charge 2 and ignites it. Centrally from the bottom of the blind bore 34, a first conical nozzle 39 preferably leads into a preferably second conical nozzle 40. The first conical nozzle 39 is arranged between the ignition boost charge 2 and the second conical nozzle 40. The second conical nozzle 40 opens in the direction of the Flammleitrohres 12 and disposed therein transfer charge 49. On the outer circumference of the second threaded portion 31, a thread 32b is applied, with which the entire ignition unit just described 42 is connected to other parts of the lighter.

To connect the ignition unit 42 with a Flammleitrohr 12, an adapter tube 4 is provided, which has two end-brought blind holes 43a, 43b, each with a thread 44a, 44b. The blind holes 43a, 43b are connected by a bore 45. On the inner wall of the bore 45, an O-ring 41 is inserted. This is used relative to the held by a bush 46 inner liner 8 for better sealing of the transfer charge 49 against moisture. Toward the second conical nozzle 40, a screen disc 5 is arranged at the end of the blind bore 43a, which is pressed from the front end of the nozzle element 3 onto the shoulder 47 on the bore 45. The screen disc 5 closes in the case of the use of "benite strands" as a transfer charge 49, the second conical bore 40th In the blind bore 43b, in a first embodiment, a flame guide tube 12 is screwed in via the thread 44b (see FIG. 1), which has a mating thread 48 which mates with this on its outer circumference. The arranged in Flammleitrohr 12 transfer charge 49 protrudes from the Flammleitrohr 12 and passes through the bore 45 to the screen plate 5 and is applied to her.

The invention will be explained in more detail with reference to four figures.

Show it:

Figure 1 - an overall view of an ignition device according to the invention;

Figure 2.1 - an enlarged view of the ignition unit 42 consisting of the bottom piece 1 with the pole piece 14, the insulating sleeve 15, the

Ignition element 16, the primer receptacle 17, the priming charge 2 and the nozzle element 3; Figure 2.2 - a sectional view of the nozzle element 3; Figure 3 - a partial view of the adapter tube 4 with the screen plate 5 and the inner liner 8; Figure 4 - a partial view of an embodiment of the Flammleitrohres 12 with the closure piece. 9

In the embodiment shown in Figure 1, the Flammleitrohr 12 consists of an outer metal tube with different outlet holes 50. To seal a shrink tube 13 is mounted from the outside. In specific embodiments, an inner liner 8 may additionally be arranged in the interior between the transfer charge 49 and the inner side of the metal tube. This serves to better seal against moisture and / or constituents of the propellant charge. In the embodiment shown in Figure 3, only the inner liner 8 is shown. The transfer charge 49 inside the Flammleitrohrs 12 is preferably made of ring tablets. It can also consist of rod-shaped igniter mixtures, so-called "benite strands".

Figure 4 shows the Flammleitrohr 12 individually with its shrink tube 13 on the outer surface. The ignition unit 42 facing away from the end of the Flammleitrohrs 12 is different form.

The pyrotechnic igniter according to the invention for igniting pyrotechnic propellant charges or explosives comprises a Flammleitrohr used for uniform ignition of the propellant 12, which is connected to a cylindrical bottom piece 1 and screwed into a cartridge sleeve, wherein between the Flammleitrohr 12 and a cylindrical bottom piece 1 a Nozzle piece 3 is provided which fixes the ignition element 16 in the bottom piece 1 and has at least one first nozzle 39 which ensures the connection to the transfer charge 49 arranged in the flame guide tube 12.

Preferably, between the Flammleitrohr 12 and a second nozzle 40 is provided.

Furthermore, the nozzle piece 3 with the threaded parts 30, 31, the bottom piece 1 with the adapter tube 4 and the Flammleitrohr 12 may be connected.

Alternatively, the nozzle piece 3 can be inserted into the open end of the Flammleitrohrs 12 and screwed together with this in the bottom piece 1. Advantageously, when using "benite strands" as transfer charge 49, a screen disc 5 is placed on the second nozzle 40.

Particularly preferred is a screen plate 5, which has openings, which are arranged centrally and separated from circular and radially arranged webs.

For flame guide tubes with an L / D ratio between 2 and 4, preferably nozzle pieces 3 are used which have only a first nozzle 39.

For flame guide tubes with an L / D ratio between 5 and 15, the use of a nozzle piece 3 with a first nozzle 39 and a second nozzle 40 is preferred.

The invention will be further explained below.

The Flammleitrohr 12 consists of a metal tube, which is not completely pierced on one side, so as to provide a particularly stable one-sided closure. The propellant charge igniter is terminated on the tail end either by a termination piece threaded over the flame guide tube, or the flame guide tube is directly closed by pinching.

A similarly constructed Flammleitrohr which is not fully drilled, can also be used in detonators for mortar ammunition.

The outlet openings at the end of the Flammleitrohres 12 are provided by flame openings 10a, which have a direction of about 45 ° forward in the propellant powder space, thereby a directed outflow of Gases and hot particles and thus a better ignition, for example, in the front of the cartridge to achieve.

The pyrotechnic transfer charge 49 in the interior of the Flammleitrohrs 12 is preferably made of ring tablets. It can also consist of rod-shaped igniter mixtures (benite strands) or of cylindrical tablets.

Conventional propellant lighters for 120 caliber bullet ammunition have e.g. a length between 180 mm and 300 mm. In order to increase the breakdown power of a kinetic energy penetrating bullet (KE penetrators), it may be necessary to maximize its length. Towards the bottom of the cartridge, the length of the penetrator is limited by the propellant charge igniter.

In order to use a particularly long KE penetrator, the propellant charge used may not exceed a certain length. The L / D ratio should be between 2 and 4 (see Figure 4). L is here 60 mm to 100 mm and is the length of the Flammleitrohrs 12 and D is the diameter of the Flammleitrohrs 12th

By following measures, the manufacturing costs of the lighter can be reduced:

1) The connection of the bottom piece 1 with the Flammleitrohr 12 and the Flammleitrohrs 12 with the closure piece 9 can be done by laser welding.

2) The material of the flame guide tube 12,

3) the material of the bottom piece 1 and

4) The material of the end piece consists of free cutting steel. Due to the construction according to the invention, the constructional peculiarity of the lighter is self-sealing.

The pole piece 14 fits into the bottom piece 1 so that an increasing pressure on the side of the pole piece 14 leads to a pressing of the pole piece 14 on the end wall 25 of the bottom piece 1. Between pole piece 14 and bottom piece 1 is an insulating sleeve 15 made of vulcanized fiber (Hydratellulose). This is compressed with increasing gas pressure and on the one hand the gas tightness, on the other hand, the electrical insulation of the two components (pole piece 14 and thus Polstift 36 of the ignition element 16 and the outer periphery of the ignition element 16 and thus the Anzündhütchenaufnahme 17 and the bottom piece 1 safely.

The material of the pole piece 14 is preferably made of the alloy CuNi ₃ Sh, which is corrosion resistant and has a high mechanical strength.

LIST OF REFERENCE NUMBERS

1 bottom piece 29 end

2 ignition boost charge 30 first threaded part

3 nozzle element 31 second threaded part

4 adapter tube 32 external thread a, b

5 screen disc 33 projection

6 O-ring 34 blind bore

7 thread 35 blind hole

8 inner liner 36 pole pin

9 locking piece 37 pole hole

10 flame opening a, b 38 bore

11 longitudinal axis 39 first nozzle

12 Flammleitrohr 40 second nozzle

13 Heat shrink tubing 41 O-ring

14 pole piece 42 Ignition unit

15 insulating sleeve 43 blind bore a, b

16 ignition element 44 thread a, b

17 Ignition cap 45 Drilling

18 male thread 46 female

19 projection 47 shoulder

20 first blind hole 48 counter thread

21 second blind hole 49 transfer charge

22 closed end 50 recess

23 open end 51 insulating bushing

24 contact surface 52 insulating washer

25 loading containers

26 recess

27 extension

28 hole

Claims

claims

1. Pyrotechnic igniter for igniting pyrotechnic propellant charges or explosives comprising a Flammleitrohr used for uniform ignition of the propellant 12, which is connected to a cylindrical bottom piece 1 and screwed into a cartridge sleeve, wherein between the Flammleitrohr 12 and a cylindrical bottom piece 1, a nozzle piece. 3 is provided, which fixes the Anzündelement 16 in the bottom piece 1 and has at least one first nozzle 39, which ensures the connection to the arranged in the Flammleitrohr 12 transfer charge 49.

2. Lighter according to claim 1, characterized in that between the Flammleitrohr 12 and the first nozzle 39, a second nozzle 40 is provided hen.

3. Lighter according to claim 1 or 2, characterized in that the nozzle piece 3 with the threaded parts 30, 31 connects the bottom piece 1 with the adapter tube 4 and the flame guide tube 12.

4. Lighter according to claim 1 or 2, characterized in that the nozzle piece 3 is inserted into the open end of the Flammleitrohrs 12 and screwed together with this in the bottom piece 1.

5. Lighter according to claim 2 or 3, characterized in that at

Use of extruded transfer charge 49 a screen plate 5 is placed on the second conical nozzle 40.

6. Lighter according to claim 5, characterized in that the screen disc has 5 openings, which are arranged centrally and separated by circular and radially arranged webs.

7. Use of a lighter according to claim 1 or 4 for Flammleitrohre with an L / D ratio between 2 and 4.

8. Use of a lighter according to one or more of claims 1 to 6 for Flammleitrohre with an L / D ratio between 5 and 15.