DE2029479C2 - Life saving breathing appts. with catalyst to remove carbon mon:oxide - has knitted fabric pref. of aluminium alloy to cool inhaled air - Google Patents

Abstract

The Parent Patent describes a life-saving breathing appts. for protection against carbon monoxide comprising a filter casing filled with catalytic material and a heat exchanger downstream of the catalyst and composed of metal filaments, through which the inhaled and the exhaled air pass alternately to cool the inhaled air. In this addn. this heat exchanger (1) is composed of metal filaments arranged in a tubular knitted form and assembled to form a package. Pref. material for the filaments is aluminium alloy. This arrangement results in improved efficiency over previous devices and esp. because the filaments are anchored in the knitted fabric, does not allow filaments to enter the mouthpiece and the mouth of the wearer.PS.

Description

The invention relates to a filter self-rescuer for protection against carbon oxide, consisting of a with catalytic mass-filled filter housing and a valve head with mouthpiece, in which, in the direction of flow seen the inhaled air, behind the catalytic masses for cooling the inhaled air in from one Metal thread or several existing ones, alternately traversed by the inhaled air and the exhaled air Heat exchanger is arranged according to patent 1, '08 843.

The subject of the main patent mentioned, which is also pre-published by CH-PS 4 32 247, and the subject of DE-OS 14 34 893 are designed such that the metal threads run back and forth randomly. As a result, the wires can protrude through the mouthpiece or through it into the mouth of the

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15 users. Furthermore, such a packing of the wires is relatively unfavorable in terms of flow and in terms of heat dissipation.

In another known subject of the type mentioned (DE-OS 14 34 909) are Metal threads in an arrangement not described in detail and provided as a metal web.

Finally, a filter self-rescuer of the type mentioned has become known (DE-GM 19 22 333), in which the heat exchanger consists of several series-connected Seven consists

These heat exchangers, too, can still be improved.

The invention is based on the obstruction of the user by pieces of wire eliminate and with regard to the flow conditions and the heat dissipation a favorable and as possible to create a reproducible arrangement of the wires at all times.

This object is achieved according to the invention in that the metal thread (s) forms (s) a tubular knitted fabric which is put together to form a package.

The threads are anchored in the knitted fabric and as a result cannot protrude through the mouthpiece or get through this into the mouth of the wearer. Furthermore, it is due to the measure according to the invention possible to create more favorable, always reproducible flow and heat dissipation conditions than in the known cases.

A further development of the invention consists in that the thread consists of an aluminum alloy. Of the The thread is thus permanently deformable, and the thread package retains the shape it has once given.

In the single figure of the drawing, an embodiment according to the invention is illustrated. The heat exchanger according to the invention is denoted by 1.

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Claims (2)

Patent claims: 1. Filter self-rescuer for protection against carbon oxide, consisting of one with catalytic masses filled filter housing and a valve head with mouthpiece, in which, in the direction of flow Inhaled air seen behind the catalytic masses for cooling the inhaled air in from one Metal thread or several existing ones, alternating between the inhaled air and the exhaled air through-flow heat exchanger is arranged, according to patent 17 08 843, characterized in that the metal thread (s) is a tubular knitted fabric, which is put together to form a package, forms (form). 2. Filter self rescuer according to claim 1, characterized in that the thread consists of an aluminum alloy consists.