DE1237903C2 - CARBON MONIXYDE FILTER SELFSTRETTER - Google Patents

Description

GERMAN WTTWt PATENT OFFICE

EDITORIAL DEVELOPMENT DeutscheKl .: 61 a-29/02

Number: 1 237 903

File number: D 42027 V / 61 a

1 237 903 filing date: July 18 , 1963

Opened on: March 30 , 1967

There are so-called carbon monoxide filter self-rescuers known that are used in particular to protect the Serve miner against carbon monoxide present in the ambient air. The filter self-rescuer consists, among other things, of a filter container made of z. B. Sheet metal, which is a carbon monoxide Contains catalyst which oxidizes at normal temperature. In addition, in the filter container still other chemicals, especially desiccants, can be accommodated. The filter canister is either Connected to a mask or to a mouthpiece, creating the connection to the respiratory organs of the device carrier is produced. There are also devices known in which the filter container and the mouthpiece or the mask form a structural unit.

Such filter self-rescuers have the disadvantage that by the oxidation of carbon monoxide If the outside air has a high carbon monoxide content, heated air reaches the mouth of the device wearer and cannot be inhaled without harm. In order to remedy this deficiency, one is known Filter self-rescuer with the mouthpiece housing to dissipate heat to the outside air Ribs. However, the cooling effect achieved in this way is not sufficient.

There is also a filter breathing apparatus known, the filter container housed in a housing and a plate cooler with a connection piece, which is also housed in the housing of the housing to which the breathing tube is connected. The case is provided with openings which are arranged in the vicinity of the plate cooler. When inhaled, the Outside air is sucked into the interior of the filter container through the openings and on the way to this guided around the surfaces of the plate cooler and the outer wall of the filter container. For this it then flows through the interior of the plate cooler to the breathing tube. With this device, the Do not heat the walls of the filter container to the environment by convection or radiation be delivered. Rather, the heat is only applied to the inhaled air before it enters the filter container released so that the inhaled air is excessively heated.

Another way has been taken with filter self-rescuers, whose filter housing has a Tubing connected to the mouthpiece or a mask. With these filter self-rescuers is the Breathing tube designed as a corrugated tube. This releases some of the heat from the filter carbon monoxide filter self-rescuer

Applicant:

Drägerwerk, Heinr. & Bernh. Dräger,
Lübeck, Moislinger Allee 53/55

Inhaled air exiting the housing is discharged to the outside on the way to the mask. With a well-known Filtered breathing apparatus with a filter material that corresponds to the intended use of the device containing filter is connected via a hose to a mouthpiece is inside

Ao of the hose is arranged a further hose leading the exhaled air in countercurrent to the inhaled air, one end of which is connected to an exhalation nozzle penetrating the filter housing. In this device, the inhaled air is to be warmed by the warm exhaled air and the exhaled air is used to heat the chemical housed in the filter housing. In another filter self-rescuer with an oval filter housing and an attached valve box carrying the inhalation tube, this is arranged on the most curved part of the housing shell and connected to the air outlet opening of the filter housing via a line that is able to cool the breathing air coming from the filter. The line can be completely or partially provided with cooling fins. With this device, the cooling depends on the amount of air that happens to be led past the cooler. In particular, the cooling is insufficient when the ambient air is very warm and stagnant.

The invention relates to such a carbon monoxide filter self-rescuer with a filter housing, containing a carbon monoxide oxidizing catalyst, and with a mouthpiece or a Mask, seen in the filter housing in the direction of flow of the inhaled air, behind the Catalyst a cooler is arranged for the inhaled air. It is based on the task To train this cooler filter self-rescuer so that the cooling is more effective and always in one of the use of the device depends on the constant scope. The solution is that

709 547/30

Claims (1)

the cooler is designed as a tube or plate cooler through which the inhaled air flows The exhaled air flows around the outer walls. The invention has the advantage that the Heat contained in the inhaled air on its way from the catalyst layer to the respiratory organs the exhaled air, which is cooler than the inhaled air, is cooled to the extent of the breathing and that the temperature of the coolant does not depend on that of the outside air. Further features of the invention are the subject matter of claim 2. In the drawing, an embodiment is shown schematically, namely A b b. 1 the filter self-rescuer in longitudinal section and A b b. 2 shows a cross section in the plane BB of FIG. The A b b. 1 and 2 show a filter housing 1 for the catalyst mass, in which, viewed in the direction of flow of the inhaled air, a tubular cooler 15 is arranged behind the catalyst, the cross section of which corresponds to the cross section of the filter housing, but can also have a larger or smaller cross section. The tube cooler consists of a large number of tubes 16 through which the inhaled air flows and which end in an end piece 17 which is directly connected to the mouthpiece 4 . The outlet connection 18 of the end piece 17 carries the inhalation valve 5. The tubes 16 are accommodated in a housing 20 which closes off the cooling space 19 from the outside. This is traversed by the exhaled air, which flows in the direction of the dashed arrow. flows. The exhaled air leaves the housing through the exhalation port 22 which carries the exhalation valve 7. Two connecting hoses arranged one inside the other can be interposed between the mouthpiece 4 and the housing 20. The connections must then be designed accordingly. Patent claims: ίο 1. Carbon monoxide filter self-rescuer with a Filter housing, which contains a carbon monoxide oxidizing catalyst, and with a mouthpiece or a mask, in which a cooler for the inhaled air is arranged behind the catalyst in the filter housing, seen in the direction of flow of the inhaled air, characterized in that the cooler is used for the inhaled air tube or plate cooler (15) with a flow through it, the outer walls of which are surrounded by the exhaled air. 2. Carbon monoxide filter self-rescuer according to claim 1, characterized in that the exhalation valve (7) of the filter self-rescuer is arranged in the part of the wall of the filter housing (1) surrounding the cooler. Considered publications:
German Auslegeschrift No. 1016 564;
U.S. Patent Nos. 1,474,205, 1,999,086;
Magazine "Die Gasmaske", 1935, pp. 91, 92;
"Dräger-Hefte", No. 194, 1938, p. 3742. 1 sheet of drawings 709 547/30 3.67 © BundesdrucIcerei Berlin