DE1964485A1 - Climatic chamber - Google Patents

Description

The invention relates to a climatic chamber with a climatic chamber, its air temperature and humidity with Pel.tierelemen.ten can be regulated »whereby at least some of the Peltier elements is arranged in a circulating air line, with the air from the The air-conditioned room can be extracted and returned to it.

Are known, for example, from the literature by E. Klein and H-. Walz "Some possible uses of Peltier cooling elements" in GIT ~ trade journal for the laboratory, 11th year, 1967, pages 405 to 411 climatic chambers in which the climate in the climatic chamber, ie the temperature and the humidity in the climatic chamber, is controlled with Peltier elements. For example, a location climate can be simulated or any climate in the climate room can be simulated. A Peltier-cooled moisture separator, as it is used to regulate the humidity in the device described, is by W. Koch and H. Walz under the title "New water vapor separator with Peltier cooling as a versatile additional device for gas exchange measurements" in Naturwissenschaftliche Rundschau, Volume 19, 1966, page 163 described. With this device, in which the volume of the climatic room is approximately '_; 0.25 m, the temperature in the climatic room is between approx. 20 ⁰ O and approx. + 60 ^{0 G.} adjustable to + 0.5 ^° C. and the absolute humidity in the chamber to approximately 2 fa If the volume of the climatic space of the known device is increased,

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for example to 1 m and more, an unacceptably high economic outlay is necessary if the above-mentioned control accuracy is to be maintained.

There is the task of building a climatic chamber of the type mentioned in such a way that it can also be used with a larger volume can be produced with little economic outlay.

According to the invention, this object is achieved in that the side walls and the cover of the climatic chamber are multi-walled Hood are designed that the space between two walls of the hood is part of the air circulation and that the hood on the Cover plate of a housing is seated, which is also part of the air circulation line and in which Peltier elements are arranged.

The circulating air preferably flows back into the air-conditioned room via the hood and it can be in the inner wall of the hood at least one opening can be provided, at least by its position and shape with respect to the central axis of the climatic chamber approximately a symmetrical inflow of the Umlufb is achieved will. The circulating air can flow back into the air-conditioned room from above via the hood.

A space between two walls of the hood can no longer be evacuated and a space between two walls of the hood can be flushed with a cooling medium.

At least one opening can be provided in the cover plate of the housing for sucking off the circulating air, these openings can be arranged and shaped in such a way that the circulating air is at least approximately symmetrical to the central axis of the climatic chamber can be extracted. It is advantageous »two parallel in the housing. Provide flow paths for the circulating air and a two-way valve for the metered introduction of the circulating air into both flow paths

_ 3 _ ORIGINAL BATHROOM

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to arrange. Some of the Peltier elements can be in one of the parallel flow paths and the other part of the Peltier elements can be arranged after the merging of the two parallel flow paths. An intermediate floor can be provided in the housing be, wherein the two-way valve is arranged approximately in the middle of the housing, via the circulating air into the room above and / or can be guided below the intermediate floor, openings in the intermediate floor can be made on the side wall of the housing be provided and it can be provided in the cover plate of the housing openings in the circulating air flow path Open hood and Peltier elements can be provided in the openings in the intermediate floor and the cover plate.

The device according to the invention is extremely simple and space-saving built up. The air-conditioned room is limited by the transparent hood, which at the same time provides a flow path for the circulating air is. Since only the hood has to be sealed against the cover plate of the housing, the sealing problems that arise are simple to solve. The symmetrical routing of the circulating air ensures that no temperature and humidity gradients in the Climatic space occurs and the wind speed does not vary significantly. No Peltier elements are arranged in the climatic room, whereby water separation is avoided. The air conditioning is carried out in the housing. It is special it should be emphasized that a separate moisture separator is not required. By guiding and tempering and the humidity of the air flowing into the climatic room does not differ from the temperature and humidity required for the climatic room deviates.

In the following, the device according to the invention is described in more detail by way of example with reference to the figure.

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In the figure, a climatic chamber is shown in section. on the cover plate 1 of a housing 2 sits on a dome-shaped hood 3 made of transparent material, for example is made of a plastic. The hood 3 is multi-walled. In the embodiment, there are three walls 3a, 3b and 3c provided. The space 4 between the walls 3b and 3c is closed. This room 4 can be evacuated or it can be flushed through with a liquid or gaseous cooling medium, for example with water. Mouthpiece, via which the room 4 can be evacuated or a cooling medium can be introduced into the room 4 are not taken into account in the figure, to keep the clarity.

The space 5 between the walls 3 a and 3 b of the hood 3 is open towards the cover plate of the housing 2. In addition, the At the top of the dome-shaped hood 3 an opening 6 is arranged, via which the intermediate space 5 with the climatic chamber 7 of the climatic chamber connected is. The space 5 is a part of the air circulation duct, which will be described in detail later.

Sealing rings 8 and 9 are provided between the hood 3 and the cover plate 1 of the housing 2. To open the climate room 7, the hood 3 is lifted over the hook 10 from the cover plate. In particular, this simple opening mechanism provides sure that the climatic chamber 7 with the sealing rings 8 and 9 can be closed gas-tight without any special effort, whereupon has already been pointed out.

Organisms, for example plants, can be arranged in the interior of the climatic space 7. In the embodiment is In the climatic room a vessel 11 which is provided with a cover plate 12, in this vessel 11 plants can be planted. It should be noted that the earth in the vessel 11 is separate

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can be air-conditioned. Partition walls, an partition 13, can be provided to subdivide the climatic chamber 7 is arranged in the climatic chamber 7 of the exemplary embodiment shown.

In the cover plate 1 of the housing 2 there are openings 14 and 15 intended. The openings 14 open into the space 5 between the walls 3 a and 3 b of the hood 3. The openings 15 open into the climatic chamber 7. They are distributed essentially symmetrically with respect to the longitudinal axis 16 of the climatic chamber. the Openings 15 lead in a disk-shaped space 17 in the housing 1, which via a tube 18 towards the interior of the housing 1 is open. The impeller 19 of a fan is arranged in the tube 18.

In the housing 1, an intermediate base 20 is provided which has openings 21 on the side wall of the housing 1. By this intermediate floor 20 two parallel flow paths and 23 are formed for the circulating air, into which a two-way valve 24 the circulating air can be introduced in a metered manner. As a two-way valve 24, an air slide is provided, which is in the center of the housing is arranged below the tube 18. This air slide 24 is rotatably attached to the intermediate floor 20 and has openings 25 which can be brought into alignment with openings 26 in the intermediate floor 20 when the slide is turned. In the side walls of the rotary valve 24 openings 27 are provided, which when rotating the air slide with openings for Alignments are to be brought, which are provided in a wall 28 with which the flow path 22 is closed against the air slide 24 is.

On the side wall of the housing 1, two groups 29 and 29 of Peltier blocks are arranged, to which Feitierelemente are combined. The Peltier blocks 29 sit in the openings

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21, which lead back from the flow path 23 to the flow path 22. The Peltier blocks 30 sit in the openings 14, with which the flow path 22 with the space 5 of the hood 3 is connected. The Peltier blocks are fastened in the side wall of the housing 2. For thermal shielding the Peltier block ^ insulation material 31 is provided. Heat exchange flags 32 are placed on one side of the Peltier block ^ 29 and 30, which protrude into the air circulation line. The other side of the Peltier block ^ 29 and 30, which are in the insulation material is anchored, is provided with flow channels 33. A heat exchange medium can be conducted through the flow channels 33 with which thermal energy can be supplied to the Peltier blocks or derived from the Peltier blocks.

The path of the air flow in the climatic chamber and in the circulating air line is indicated by arrows. With the fan impeller 19 is via the openings 15 in the cover plate 1 of the Housing 2 air sucked out of the climatic chamber 7 into the circulating air line. With the air slide 24, which is adjustable from the outside, the amount of air is determined, which in each of the parallel Flow paths 22 and 23 is fed. The circulating air of the flow path 23 is before flowing back into the flow path 22 passed over the heat exchange lugs of the Peltier blocks 29. The temperature of the heat exchange plumes of the Peltier blocks 29 corresponds to a certain dew point. According to this dew point temperature is therefore on the heat exchange flags Separated water and adjusted the humidity of the circulating air. The air flows out of the flow path 23, back into the flow path 22 and mixes with the directly through the Flow path 22 guided air. The entire circulating air is then passed over the heat exchange lugs of the Peltier blocks 30, The temperature of the circulating air flowing back into the climatic chamber 7 is set by these Peltier blocks 30. The Um-

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air flows through the space 5 and the opening 6 in the inner wall 3 a of the hood 3 from above into the climatic chamber 7. Due to the position of the opening 6 and the symmetrical Distribution of the openings 15 in the cover plate of the housing 2 ensures that the air enters the climatic space 7 symmetrically with respect to the central axis 16 flows through.

By dividing the Peltier blocks into two groups 29 and 30 it is achieved that only air flows back into the climatic chamber 7, which has the required temperature and humidity, because the air that has been very strongly cooled at the Peltier blocks 29 according to the set dew point is heated when flowing over the Peltier blocks 30 to the required target temperature of the climatic room. It is still advantageous nor that in the climatic chamber 7 no heat exchange flags of Peltier blocks are arranged. As with the temperature control the temperature of these heat exchange flags is usually below the target temperature in the climatic chamber 7, can generally be calibrated Do not avoid water separation on such heat exchange tabs. It should also be pointed out that on the side wall of the housing 1 there is a large area for attaching the Peltier blocks 29 or 30 is available. It is therefore possible, even with larger volumes of the climatic space 7, to set the temperature or Carry out humidity control very quickly without excessively large amounts of air being passed through the air circulation line Need to become. The wind speed in the climatic chamber 7 therefore remains within tolerable limits.

15 claims
1 figure

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Claims (15)

VPA 69/1046 - 8 claims / 1. Climatic chamber with a climatic chamber, its air temperature and —Air humidity can be regulated with Peltier elements, whereby at least some of the Peltier elements are arranged in a circulating air line, with which air can be sucked out of the air-conditioned room and can be returned to it, characterized in that the side walls and the cover of the climatic chamber (7) are designed as a multi-walled hood (3) that the space (5) between two walls (3a and 3b) of the hood Part of the air circulation line and that the hood is on the top plate (1) of a housing (2) which is also part of the circulating air line and in which the Peltier elements (29 and 30) are arranged. 2. Climatic chamber according to claim 1, characterized in that the circulating air flows back through the hood (3) into the climatic chamber (7). 3. climatic chamber according to claim 1 or 2, characterized in that in the inner wall (3a) of the hood (3) at least one Opening (6) is provided through which the circulating air flows back into the climatic chamber (7) and that by the position and shape of the opening P a with respect to the central axis (16) of the climatic chamber at least approximately symmetrical inflow of the circulating air can be achieved is. 4. climatic chamber according to one of claims 1 to 3, characterized in that that the circulating air flows back through the hood (3) from above into the climatic chamber (7). 5. climatic chamber according to one of claims 1 to 4, characterized in that that the hood (3) is dome-shaped. ORIGINAL VPA 69/1046 6. climatic chamber according to one of claims 1 to 5, characterized in that the space (4) between two walls (3b and 3c) the hood (3) can be evacuated. 7. climatic chamber according to one of claims 1 to 6, characterized in that that the space (4) between two walls (3b and 3c) of the hood (3) can be flushed with a cooling medium. 8. climatic chamber according to one of claims 1 to 7, characterized in that that the hood (3) is made of translucent material. 9. climatic chamber according to one of claims 1 to 8, characterized in that that in the cover plate (1) of the housing (2) at least one opening (15) is provided for sucking off the circulating air is. 10. climatic chamber according to claim 9 »characterized in that the openings (15) in the cover plate (1) are arranged and are shaped so that the circulating air can be sucked off at least approximately symmetrically to the central axis (16) of the climatic chamber (7) is. 11. climatic chamber according to claim 9 or 10, characterized in that in the housing (2) below the suction openings (15) Fan (19) is arranged. 12. Climate chamber according to one of claims 1 to 11, characterized in that two parallel flow paths in the housing (2) (22 and 23) are provided for the circulating air and that a two-way valve (24) for the metered introduction of the circulating air into both flow paths is arranged. 10 - 1098 27/07 U VPA 69/1046 - 10 - 13. Climate chamber according to claim 12, characterized in that some of the Peltier elements (29) in one of the parallel Flow paths (22 or 23) and the other part of the Peltier elements after the two parallel flow paths have been brought together is arranged. 14. Climatic chamber according to claim 12 or 13, characterized in that that an intermediate base (20) is provided in the housing (2), that the branch-way valve (24) is approximately in the middle of the housing. is arranged, via which circulating air can be guided into the space above (22) and / or below (23) the intermediate floor, that on the side wall of the housing openings (21) are provided in the intermediate floor that in the cover plate (1) of the Housing openings (14) are arranged which flow path into the circulating air (5) of the hood (3) and that Peltier elements (29 and 30) are provided in the openings in the intermediate floor and the cover plate. 15. Climatic chamber according to one of claims 12 to 14, characterized in that an air slide valve is used as a two-way valve (24) is provided. 1Q98? 7 / n7U