SE412321B - ROOM AIR CONDITIONING FILTER FOR REGULATION OF BREATHING AIR IN CLOSED ROOMS - Google Patents

Description

71544402-3 2 for the air to be regenerated, since the turnover of the exhaled carbon dioxide does not itself cover the oxygen requirement.

In a device of this kind, sieves and / or sheet metal bowls are arranged transversely to the direction of flow in the container, on which layers of granulated alkali peroxide lie from house wall to house wall.

In the layers there is always an opening at a certain distance from the house wall. The openings are offset from each other from layer to layer.- Although this device reduces the flow resistance, the utilization of the chemical means is not particularly efficient. In addition, the production of this filter is very expensive.

An adaptation of the oxygen production to the need is not possible with this design of the device.

In a further known device, alkali superoxide pressed onto sheets was used. The greater density of the agent thus achieved allows a larger amount of oxygen to be stored per unit volume, but discs must be pressed, which due to their tenderness cannot be made too thin, but at greater thickness a less efficient utilization is obtained. of the chemical agent.

An overproduction of oxygen at the beginning of utilization must therefore be taken into account. A later reduction in the evolution of oxygen occurs because the agent pressed into a disc is air-permeable, so the reaction can only take place on the surface of the disc, which during the reaction slowly forms a crust and thereby becomes partially inactive through the spent agent. A regulation of oxygen production in dependence on the available amount of water vapor is not possible in this way. Due to the unregulated reduction in oxygen production over time, oxygen deficiency can also arise.

According to a further proposal, for damping the oxygen generation, a desiccant and an absorbent for carbon dioxide are arranged in front of the chemical agent in the container. Since the flow direction is determined, certain disadvantages arise because this filter does not provide sufficient oxygen under certain conditions, and the effect of oxygen production is greatly delayed under certain circumstances.

This occurs when the moisture present in the room is low, for example at low room temperatures, since first the exhaled carbon dioxide is largely absorbed and the existing and emerging moisture is substantially absorbed by the desiccant. The desired damping of oxygen production is not determined and can therefore also lead to a lack of oxygen. The filter can therefore not be adapted to the different climatic conditions in the rooms due to the seasons. 7414402-3 3 A device is also known in which oxygen production is regulated. The device consists of two filters arranged in parallel, one filter containing an agent which emits oxygen, while the other filter has the function of absorbing only carbon dioxide. Both filters are equipped with their own separate supply device for room air. With a selector device, the room air is guided, depending on the oxygen content in the room, either through the oxygen-releasing or via the carbon dioxide-binding filter.

This device is in principle capable of keeping the oxygen content constant within certain limits in different climatic conditions. However, the device is technically complicated.

The object of the present invention is to provide an air reconditioning filter which is free from the mentioned disadvantages, is easy to manufacture and which during its use can be adapted to the different conditions.

This is achieved by means of a filter of the type indicated in the introduction, which filter is mainly characterized in that a desiccant layer, which occupies 1-50%, preferably 25-50%, of the volume of the entire filling, is arranged in front of the preparation layers in the direction of only one connection opening. and that markings and / or instructions are arranged on the outside of the container for the climatically suitable flow direction in each case.

The advantage achieved with the air reconditioning filter according to the invention is that it becomes possible, in accordance with the current climatic conditions, to regulate the oxygen evolution proportionally to the oxygen demand and thus avoid too low or too high oxygen contents and thereby optimal utilization of the filter. This is achieved through the construction of the filter, which is adapted to the water vapor content existing in the room, which can be different in size, regardless of the number of people in the room.

At low water vapor concentrations (eg less than 13 g / m3) in the room air - or at low room temperatures (eg below 15 ° C), at which due to the saturation value of water vapor in air only the corresponding low water vapor content is obtained - the required amount of oxygen is achieved. as the oxygen-releasing chemical is directly affected by the room air. In this case, the filter is connected to the air transport device in such a way that the flow takes place in the direction of the arrow A.

At higher water vapor concentrations and higher room temperatures, respectively, the direct impact of the chemical would result in an overproduction of oxygen. When flowing through in the direction of arrow B, the air flowing into the filter is pre-dried to such an extent that the amount of oxygen generated corresponds to the need. In the stated embodiment, the desiccant in front of it also exerts a certain regulatory function in terms of time, since its water-absorbing effect is particularly great at the beginning of utilization, since the chemical or chemical agent still has full effect. On the other hand, the action of the desiccant decreases towards the end of the use of the filter, as the chemical due to its consumption requires a higher water supply.

Through folding screens, between which the chemical is embedded and which are mutually offset 90 °, the effective abutment surface of the chemical is enlarged, thereby avoiding the risk of consumption of the upper layer. As a result, a low flow resistance is obtained, which does not increase significantly during operation.

Finally, it has become possible to work with a relatively fine, substantially uniform chemical grain size, whereby it has become possible to obtain a greater chemical density and simplify the production of the filter. According to the invention, it is further proposed to place temperature and humidity indicators in the vicinity of the openings in a visible place, ie. the connection sockets, in order to be able to assess the climatic conditions. These measuring instruments can also indicate during operation, if it is appropriate to change the flow direction, if the temperature and humidity of the air flowing into the filter change to a corresponding extent.

The placement of a temperature gauge in the vicinity of each opening makes it possible to read from the temperature of the outflowing air the degree of consumption of the filter. The temperature in the filter rises as a result of the reaction during operation and decreases when the chemical or chemical is consumed.

Further advantageous embodiments of the invention are set out in the appended subclaims.

The invention is now described in more detail below with reference to the accompanying drawing figure.

A container 1 contains the chemical means 4 and the drying means 5, which are held by means of perforated discs 8, which are connected to each other by means of clamping bolts 19. The chemical means 4 is stored in several layers which are kept apart from each other by wire mesh layers 6, between folding screens T The folding screens 7 are with their folds mutually offset 90 ° (not shown in the drawing).

The container 1 has two openings 2 arranged on opposite sides, which are frictionally closed by means of a tooth seal 12.

Claims (7)

5 Temperature and humidity indicating devices 11 are visibly arranged in the vicinity of the openings 2 on or in the container. When the air conditioning filter is put into service, the look 3 is removed from the container 1, after which an air transport device (not shown in the drawing) is connected taking into account the appropriate flow direction 10, which on the container 1 is indicated by arrows AI ___-_____ ___., And B. / ».I Patent Claims 1. A room air reconditioning filter for the regeneration of breathing air in enclosed spaces, comprising a container with an oxygen-releasing and carbon-binding chemical preparation and a desiccant, and with two connection openings opposite to the preparation layers, which are closable by friction with lid (3) and preferably arranged to be connected to an air transport device, characterized in that a desiccant layer (5), which occupies 10-50%, preferably 25-30%, of the volume of the entire filling, is arranged in front of the preparation layers. (Ä) in the direction of only one connection opening, and that on the outside of the container there are arranged markings (10) and / or means of instruction for the climatically suitable flow direction at any given time. Filter according to Claim 1, characterized in that the desiccant (5) consists of alumina gel. Filter according to claim 1 or 2, characterized in that the desiccant (5) is designed substantially spherical with a diameter of 2-10 mm, preferably 4-8 mm. Filter according to claim 1, characterized in that the chemical preparation layers consist of a uniform grain fraction with a grain size of preferably 4-8 mm, and that the respective first chemical preparation layer on the side facing the container openings is limited by a fold screen (7). Filter according to claim 4, characterized in that the folding screens (7), which limit the chemical preparation to both opening sides in their folding direction, are offset 90 ° relative to each other. in Filter according to one of Claims 1 to 5, characterized in that moisture-indicating means (II) are arranged on the container in a visible place in the vicinity of the openings (2). - Filter according to one of Claims 1 to 6, characterized in that temperature-indicating means (II) are arranged on the container É in a visible place in the vicinity of the openings (2). 'f' f ANFÖRDA * PüëíïkÄTï0NER: Tyskland 509 032, 671 176, 1 270 955