DE10017670A1 - Miniature fire extinguisher for one-time use with seal between propellant and extinguishing material released by heat and exit seal released in internal pressure - Google Patents

Abstract

Extinguisher has thermally releasable fusible alloy seal (5) which opens propellant reservoir (2) at predetermined temperature. Propellant gas flows into extinguishing material (3) and pressure opens seal (6) in extinguishing material reservoir. Extinguisher consists of two tubular shells (2,3) connected by metal connection sleeve (5). Shells form reservoir for propellant (2) and reservoir for extinguishing material (3). Sleeve contains overflow nozzle closed by fusible alloy.

Description

The invention relates to a fire extinguisher miniaturized design, which, because it is inexpensive to manufacture is to be used as a one-way fire extinguisher.

In principle, the fire extinguisher can be part of the basic equipment in any electrical device and in particular can be arranged in the vicinity of regions at risk of short-circuits or thermally stressed points.
Places of use: B.

• - inside computers
• - in closed cable ducts
• - in control cabinets
• - in motor vehicles
• - in aircraft

function

The principle of operation of the fire extinguisher is the thermal triggering of a melting alloy Closure which opens a propellant reservoir (TMR) at a predetermined temperature. The propellant gas flows into an extinguishing agent reservoir and there opens a seal by overpressure with predetermined breaking point on the wall of the extinguishing agent reservoir.

Blowing agent and the extinguishing medium can escape.

A peculiarity in the application of the fire extinguisher is that it is always in any position Can release extinguishing agents.

It empties in any position, whether as a powder extinguisher or filled with liquid extinguishing agent. This results in special applications, namely where the fire extinguisher with the object, to which it is attached, must change its position or if it is not attached to the correct location can be ensured.

An extension of the functionality results from the multiple linking of several Fire extinguishers to form a chain or hose, the individual extinguishers being elastic with each other are connected to ensure adaptation to the geometry of the device to be protected. Linking several extinguishers to form a complex extinguisher enables fire protection any point within a device, even in places that are difficult to access. Arises If there is a fire at a point in the housing of a device, the extinguisher that triggered the The source of the fire is closest.

If necessary, other extinguishers will follow the spread of fire.

The fire extinguisher (the "fire extinguisher chain") can, because of its structure, so to speak Meter "and can be cut to the desired length with scissors.

Self-adhesive strips allow the attachment without complex fastening technology.  

construction

The fire extinguisher consists of two tube sleeves that are connected by means of a connecting sleeve become. The sleeve contains an overflow nozzle which (according to claim 1) by a Melt alloy is closed. Pipe sleeves and sleeves are glued together.

The sleeve is expediently made of metal, which is caused by the source of the fire The quickest way is to conduct heat to the melt alloy seal in the overflow nozzle. The tube sleeves do not necessarily have to consist of metallic materials, but could can also be injection molded from high-strength plastics.

As an outlet opening for the extinguishing agent, an opening is provided in the tube sleeve that as Extinguishing agent reservoir (LMR) is intended.

The opening is closed with a seal, which prevents that at rest Extinguishing media can leak.

In the event of extinguishing, the internal pressure in the LMR will rise and melt after the overflow closure has melted a predetermined breaking point destroy the seal.

Functional details that ensure that the fire extinguisher is independent of its position

The above The fire extinguisher's preference for being able to extinguish in any position requires the following features on Extinguishing agent reservoir.

• 1. Flow guiding devices within the LMR for mixing and swirling propellant and extinguishing medium (e.g. powder). Such flow guiding devices can be arranged as in FIGS. 1-4 and, for the sake of simplicity, consist of slightly compressed chips.
• 2. The extinguishing agent reservoir automatically reduces its void volume as the volume decreases Internal pressure or reduced amount of extinguishing agent.

Modification of the structure Claims 2-3

Here the overflow nozzle between the reservoirs is not through a melt alloy closure locked.

Instead of the extinguisher set-up with propellant supply only in a separate container the connecting sleeve, a structure is conceivable here in which the propellant is not by one Closure is separated from the LM, but a barrier made of a restrained material avoids that LM penetrates into the propellant reservoir.

This variant has a predetermined breaking point on the outside instead of the seal Closure seal with thermally triggering closure (melt alloy). Melt the seal, like this the blowing agent can blow out the extinguishing agent.

The barrier should be in front of the LM (regardless of the position of the extinguisher) Outlet opening, only stored in the LMR.

This barrier consists of either a fine-meshed sieve or a fine-pored one Sintered material which does not allow gases to pass through powdery substances.  

Dimensioning: (only applies to the structure according to claim 1)

The tube sleeves do not necessarily have to be made of the same materials or with the same Wall thicknesses are made. Wall thicknesses that can withstand high pressures are only for that Provide propellant reservoir, the extinguishing agent reservoir can be designed much thinner.

The described property of the reduction of the own volume the extinguishing agent reservoir is achieved e.g. B. by upsetting the tube sleeve during the Manufacturing process.

Comparable to the compression of a water hose when it is kinked.

If the compressed LMR is filled with the LM, the internal pressure increases Bulge outwards and release the full cavity capacity.

This property of compression when emptying is useful, especially if the Fire extinguisher hangs vertically, d. H. with the LMR pointing up. In this case it would The propellant cushion cannot be able to transport the LM outwards because the LM does not find itself permanently in front of the outlet opening.

On the other hand, the reduction in cavity that occurs during emptying permanently presses the LM in front of the Outlet nozzle.

If the fire extinguisher is arranged facing downwards, i. h the LMR is the lower of both reservoirs, this property is not absolutely necessary, since gravity always puts the LM in front of the Outlet opening drops.  

DRAWINGS and explanations

Fig. 1 View of the individual parts of the fire extinguisher

Fig. 2 fire extinguisher filled with propellant and powdery propellant

Fig. 3 fire extinguisher with extinguishing agent release, the melting alloy closure ( 5 a) is melted by an increase in temperature from the outside, propellant flows into the extinguishing agent reservoir, the seal is broken, extinguishing agent escapes.

Fig. 4 fire extinguisher with a barrier ( 12 ) between the two reservoirs, the seal ( 13 ) consists of a melt alloy

Fig. 5 fire extinguisher with liquid LM shortly after the start of LM approval

Fig. 6 fire extinguisher as in Fig. 5 with advanced LM release, the reduced LM amount becomes clear the reducing LM reservoir volume

Fig elastically interconnected 7 five extinguisher.,

Fig. 8 items with filler neck on the reservoir walls

REFERENCE SIGN LIST

1

Connection sleeve with melt-alloy closure (

5

) in the overflow nozzle

2

Propellant reservoir

3rd

Extinguishing agent reservoir

5

Melt alloy closure, closes the overflow nozzle in the connecting sleeve

6

Seal for the outlet nozzle

6

a seal here stuck to the wall

6

b The seal is broken by internal overpressure at the predetermined breaking point, LM emerges

7

Flow control device

7

b -

8th

Blowing agent (TM)

8th

a TM cushion in the LM reservoir

9

Extinguishing agent (LM) here extinguishing agent powder

9

a LM in the swirled state, incoming TM is guided through the flow guide devices and swirls the LM

9

b Extinguishing agent cloud

11

stylized fire, the heat radiation of which softens the fuse

12th

Retention device, prevents LM from entering the TM reservoir

13

Sealing seal from a melt alloy

14

LM reservoir, which reduces its void volume when emptying

15

elastic connector between two separate fire extinguishers

16

Filler neck

Claims (17)

1. Fire extinguisher, characterized in that the fire extinguisher can extinguish in any position and consists of at least two interconnected cavities, one cavity serving as a reservoir of the propellant, the other as a reservoir of the extinguishing agent. In the idle state, a melt alloy closure between the two cavities prevents the media contained from being mixed. 2. Fire extinguisher, characterized in that the fire extinguisher can extinguish in any position and consists of at least two interconnected cavities, one cavity as Serves the reservoir of the propellant, the other represents the reservoir of the extinguishing agent, but with a gas cushion of the propellant is applied. 3. Fire extinguisher according to claim 2, characterized in that the connection between the two Reservoirs is not closed, being a barrier, preferably a porous material or prevents a sieve with a mesh size smaller than the smallest particle size of the extinguishing agent, the extinguishing powder penetrates into the propellant reservoir. 4. Fire extinguisher according to claims 1-3, characterized in that this with several Fire extinguishers according to claims 1-3, wherein each fire extinguisher is still independent releases an extinguishing medium from each other if necessary. 5. Fire extinguisher according to claims 1-4, characterized in that in the extinguishing agent reservoir Flow guidance devices for mixing or swirling propellants and extinguishing agents are included. 6. Fire extinguisher according to claims 1-5, characterized in that the extinguishing agent reservoir at decreasing internal pressure and or with a reduced amount of extinguishing agent its cavity volume decreased. 7. Fire extinguisher according to claims 1-6, characterized in that the propellant reservoir at following internal pressure reduced its void volume. 8. Fire extinguisher according to claim 1, 3-7, characterized in that the extinguishing agent reservoir Contains opening in its wall, which is closed by a seal and at a defined internal pressure bursts.   9. Fire extinguisher according to claim 2, characterized in that the extinguishing agent reservoir Contains opening in its wall, which is closed by a seal and at a defined Outside temperature is melting. 10. extinguishing agent reservoir according to claim 6, characterized in that the wall at decreasing internal pressure buckles inwards. 11. extinguishing agent reservoir according to claim 6, characterized in that the wall at Filling bulged outwards. 12. extinguishing agent reservoir according to claim 6, characterized in that the wall through a device is pressed in from the outside. 13. Fire extinguisher according to claim 4, characterized in that the interconnected individual fire extinguishers are strung together like a chain. 14. Fire extinguisher according to claims 1-2, characterized in that a connecting sleeve Blowing agent and the extinguishing agent reservoir connects. 15. Fire extinguisher according to claim 4, characterized in that it is elastic Connected pieces can change their relative position to each other 16. Fire extinguisher according to claim 4, characterized in that it adapts to the geometry of the can adapt to the protected object. 17. Use of the fire extinguisher according to claims 1-16, characterized in that this within cable ducts, electrical and electronic devices or within Dashboards of motor vehicles are arranged.