EP2573475B1 - Ventilation device in the form of an induction device and method for operating the device - Google Patents

Description

The invention relates to a ventilation device designed as an induction device, with a plurality of induction nozzles operated with air, in particular with primary air.

An induction device of the type mentioned is known. By operating the induction nozzles with air, an induction effect is generated, which means that air, in particular secondary air, is sucked in and mixed with the air blown out of the induction nozzles. This mixed air is then preferably used to ventilate a room in a building or the like. If the air sucked in by the induction effect flows through a heat exchanger and/or the mixed air flows through a heat exchanger, the room can be air-conditioned. The well-known induction device has several induction nozzles arranged side by side, each of which emits an induction air jet, so that a correspondingly wide zone unfolds an induction effect due to the juxtaposition of the induction nozzles, with the result that, for example, a heat exchanger over its entire width for the passage of secondary air can be used. In order to achieve a good induction effect, the known induction device has induction nozzles with a relatively large cross section. The result is a relatively high sound pressure level when the known ventilation device is in operation.

The disclosure document DE 590879C relates to a device for ventilating interior spaces, with air entering the space to be ventilated from nozzles of different sizes. The nozzles are arranged in a matrix-like manner at equal distances from one another. This publication shows the features of the preamble of claim 1.

The disclosure document DE 198 26 566 relates to a further device for ventilating a room, in which several induction nozzle arrangements are provided for generating individual jets.

The object of the invention is to provide an induction device of the type mentioned at the outset that operates relatively quietly with a high induction power.

According to the invention, this object is achieved by the features of claim 1 and the features of claim 7 .

Compared to the induction nozzles used in the known ventilation device, the individual induction nozzles of the device according to the invention are preferably designed to be smaller, ie with a smaller cross section. However, the merged induction air jet of a group of induction nozzles according to the invention produces the same or at least approximately the same induction effect as compared to the known induction nozzle of the known device with a larger cross section. However, it turns out that the sound pressure level of the grouped induction nozzles is lower, so that an induction device is created as a result of the invention, which compared to the known devices with correspondingly comparable Parameters of the conveyed air volume, in particular primary air volume, and at the same pressure of the air that acts on the nozzles, in particular primary air pressure, achieves the same or approximately the same induction effect at a lower sound pressure level.

According to the invention it is provided that the induction nozzles of each group have a smaller distance from one another than the distance between adjacent groups. The air jets of the induction nozzles of each group combine to form only one induction air jet, but the induction air jets of the individual groups preferably do not combine.

According to the invention, each of the groups has three induction nozzles. In this respect, groups of three are formed.

Furthermore, it is advantageous if the induction nozzles of each group are arranged spatially in relation to one another. The induction nozzles of each group can lie in a straight line, being positioned in such a direction that the air jets can combine to form the induction air jet, or - as mentioned above - it is provided that they are spatially arranged in relation to one another, e.g. three Induction nozzles are provided in a triangular arrangement, with the result that the air jets then also merge. The latter is also possible if the induction nozzles of a group blow out in the same direction or it is alternatively provided that the blow-out directions of the induction nozzles of a group are different, in particular converge towards one another, although a spatial arrangement of the induction nozzles can be provided.

According to the invention, it is provided that the distance between adjacent outlet openings of induction nozzles of the same group is dimension D, that the respective distance between the outlet openings and the associated merging point of the associated air jets is dimension H, and that the following relationship applies: $$\mathrm{H}=\left(1\mathrm{until}\mathrm{5}\right)\times \mathrm{D}\mathrm{.}$$

The merging point is one to five times as far away from the outlet openings of the associated induction nozzle as the distance from adjacent, associated induction nozzles, with the distance D extending from the center of an induction nozzle to the center of an adjacent induction nozzle.

A development of the invention provides that the exit angle of the air jet of each induction nozzle of the same group is in the range from 10° to 30°, in particular has a size of 20°.

Furthermore, it is advantageous if at least one induction nozzle of the induction nozzles of at least one group can be opened or closed. In this way, the volume flow of the associated, merged induction air jet can be influenced and thus the size of the induction effect can also be controlled. The arrangement is preferably made in such a way that not all induction nozzles in a group can be opened or closed, but only one or more, but not all, so that a certain induction effect remains and the induction air jet is also generated by merging, i.e. at least two induction nozzles of the same group remain open. The "opening or closing" mentioned can also be carried out with intermediate values, ie only a partial one Opening or partial closing. In the latter case, it is then also conceivable that all induction nozzles of a group can be opened or closed accordingly, since the air jets with a reduced volume flow then still combine to form an induction air jet if they are partially closed. In the case of a partial closure, it is also conceivable that only one of the induction nozzles of a group remains fully open, since its air jet combines with the partial air jet of the partially closed induction nozzle.

A development of the invention provides that the induction nozzle to be opened or closed is further away from a heat exchanger of the induction device than the other induction nozzles of the same group. The "other" induction nozzles of the same group are those that cannot be opened or closed. Since—as mentioned—the ventilation device has a heat exchanger that regulates the temperature of the air sucked in by induction, in particular secondary air, the distance of an induction nozzle from the heat exchanger affects the heating or cooling result. In this respect, it is advantageous if an induction nozzle to be closed is further away from the heat exchanger, since the other induction nozzles in this group are then correspondingly closer to the heat exchanger.

According to a further development of the invention, it is provided that the induction nozzle is opened or closed by means of a slide which interacts with the outlet opening of the induction nozzle. This slide can be adjusted automatically, for example, by means of a slide drive. Additionally or alternatively, manual adjustment of the slider is also possible. With a control edge, the slide more or less covers the cross section of the outlet opening or releases it or closes it completely. The displacement direction of the slide runs transversely, in particular at right angles, to the outflow direction of the air from the induction nozzle.

The invention also relates to a method for operating a ventilation device designed as an induction device with the features of claim 7, as described above, with several induction nozzles operated with air, in particular with primary air, from which air jets emerge, the air jets of several, one Group or a group forming induction nozzles are formed such that they merge into or into only one induction air jet with each other.

The method preferably provides for the air jets, which are preferably of the same type and/or preferably of the same size, to be formed from induction nozzles in the same group in such a way that the induction effect of the induction air jet formed is as great or almost as great as the induction effect of a fictitious, single, cross-sectional size, one Fictitious air jet blowing out induction nozzle at the same volume flow of induction air jet of the induction nozzles of this group and fictitious air jet and at the same air pressure, in particular primary air pressure, with which the induction nozzles and the fictitious induction nozzle are supplied. A comparison is thus drawn above between a group of induction nozzles according to the invention and an induction nozzle known from the prior art, which is referred to here as a fictitious induction nozzle and which has a larger cross section configured as the individual induction nozzles of the invention. When comparing the induction nozzles of the invention belonging to a group and the fictitious induction nozzle of the prior art, taking into account the parameters mentioned above, such as air pressure for operating the nozzles and volume flow, it turns out that an equally large or almost equal

great induction effect is achieved in the invention as in the prior art.

Furthermore, it is advantageous if the air jets of induction nozzles of the same group, which are preferably of the same type and/or preferably of the same size, are formed in such a way that the sound pressure level of these induction nozzles - when a certain conveyed air quantity flows through, in particular primary air quantity - is less than or at most the same as the sound pressure level of one fictitious, single, cross-sectional size induction nozzle blowing out a fictitious air jet with the same conveyed air volume, in particular primary air volume, and with the same volume flow of induction air jet of the induction nozzles of this group and fictitious air jet and/or with the same induction effect of induction air jet and fictitious air jet. Here too - as in the previous paragraph - a comparison of the invention with the prior art is carried out and the induction nozzles according to the invention, which have a smaller cross section and are arranged in groups, are compared with a single induction nozzle of the prior art which has a larger cross section and which has a ejects air jet, referred to herein as "fictitious air jet". It turns out that, taking into account comparable parameters such as volume flow, conveyed air volume and/or induction effect, the sound pressure level in the embodiment according to the invention is less than or at most the same as in the prior art. In particular, it has been found that there is a low sound pressure level.

Figur 1

einen Längsschnitt durch ein als Induktionsgerät ausgebildetes lufttechnisches Gerät,

Figur 2

eine Rückansicht auf das Gerät der Figur 1,

Figur 3

eine Vorderansicht des Geräts der Figur 1,

Figur 4

einen Luftverteilkasten mit daran ausgebildeten Induktionsdüsen des Geräts der Figur 1, und

Figur 5

ein Strömungsbild der Induktionsdüsen gemäß Figur 4.

The drawings illustrate the invention using an exemplary embodiment, namely shows:

figure 1

a longitudinal section through a ventilation device designed as an induction device,

figure 2

a rear view of the device figure 1 ,

figure 3

a front view of the device figure 1 ,

figure 4

an air distribution box with it trained induction nozzles of the device figure 1 , and

figure 5

a flow pattern of the induction nozzles according to FIG figure 4 .

the figure 1 shows - in longitudinal section - a ventilation device 1, which is designed as an induction device 2, preferably as a ceiling installation device 3. It serves to ventilate and/or air-condition a room in a building or the like.

The device 1 has a housing 4, in which a downwardly open heat exchanger 5, ie not covered by the housing 4 there, is arranged lying. Furthermore, an air distribution box 6 is arranged in the housing 4, which is air-technically connected to a primary air connection piece 7. Opposite the air distribution box 6 is an air outlet 8. Below the heat exchanger 5 is an air inlet 9. The heat exchanger 5 has medium connection pieces 10 and 11 in order to be able to conduct a medium, for example warm water or cold water, through the heat exchanger 5. The heat exchanger 5 has a multiplicity of heat exchange fins 12, of which—for the sake of simplicity—only heat exchange fins 12 located in a small zone are distinguished, the remaining heat exchange fins 12 are only indicated in a box-like manner.

the figure 2 clarifies the ventilation device 1 in rear view. It can be seen that the air distribution box 6 extends over the entire width of the device and that the primary air connection piece 7 is preferably designed as a round pipe piece. The heat exchanger 5 lets in figure 2 Recognize heat exchange tubes 13, which are connected to the medium connection pieces 10 and 11.

the figure 3 shows that the air outlet 8 extends essentially over the entire width of the ventilation device 1 and can be provided with air-guiding fins 14 .

The air distribution box 6 has a wall 15 which lies opposite the air outlet 8 and on which induction nozzles 16 are arranged, in particular formed.

During operation of the ventilation device according to the invention, air, in particular primary air, which is preferably supplied by an air control center in the building or the like via an air distribution network, is introduced into the air distribution box 6 via the primary air connection piece 7 . This air, referred to below as primary air, exits the induction nozzles 16 and generates an induction effect, which means that secondary air, in particular room air, is sucked in through the air inlet 9, which passes through the heat exchanger 5 and is temperature-treated in the process, and then into a mixing chamber 17 gets inside the housing 4, where it is mixed with the primary air emerging from the primary air nozzles 16, the mixed air thus formed being blown through the air outlet 8 into the room. In the figure 1 the arrow 18 indicates the primary air, the Arrow 19 indicates the secondary air and arrow 20 indicates the mixed air or supply air.

the figure 4 makes it clear that the mentioned induction nozzles 16 are grouped on the air distribution box 6 . Three primary air nozzles 16 each lying on an imaginary triangle form a group 21. A large number of groups, thirteen groups 12 in the exemplary embodiment, are arranged at a distance from one another over the length of the air distribution box 6, with the distance between the individual groups 21 being greater than the distance between the Induction nozzles 16 within each group 21 from each other.

the figure 4 It can be seen that the arrangement of the induction nozzles 16 of each group 21 is spatial, i.e. they are not on a straight line but are arranged on an imaginary triangle, with adjacent groups alternating in the triangular configuration, with either an induction nozzle 16 at the top and two induction nozzles 16 are below, or two induction nozzles 16 are above and one induction nozzle 16 is below.

According to the invention, it is now important that air jets 22 of a group 21 emerging from the induction nozzles 16 merge into just one induction air jet 23 . This merging takes place even at a small distance from the outlet openings 24 ( figure 1 ) of the induction nozzles 16. For clarification, in figure 5 a benchmark displayed, which shows that the individual air jets 22 - starting from the outlet openings 24 of the induction nozzles 16 - only have a free jet length of 20 to 30 mm, with the individual induction nozzles 16 of group 21 being at a distance of around 20 mm, in particular 18 mm, from one another exhibit. The distance between the nozzles is measured from the middle of the nozzle to the middle of the nozzle. If the respective distance from adjacent outlet openings 24 of induction nozzles 16 is denoted by the dimension D ( figure 4 ) and if the respective distance of the air outlet openings 24 to the associated merging point 25 of the associated air jets 22 is denoted by the dimension H, the relationship applies: $$\mathbf{H}=\left(1\mathrm{}\mathrm{}\mathit{until}5\right)\times \mathbf{D}\mathrm{.}$$

The invention assumes that with the same total volume flow and constant admission pressure, different induction nozzle arrangements can be present, namely a few large conventional nozzles (prior art) or many smaller induction nozzles 16, as is the case with the invention. However, instead of the familiar few large nozzles, many small nozzles are now distributed evenly over the air distribution box 6, but grouped together in such a way that each group 21 of correspondingly small induction nozzles 16 each form only one induction air jet 23, i.e. their air jets 22 merge with this induction air jet 23, the merged induction air jet 23 developing an induction effect that corresponds to that of a larger, known nozzle. Due to the invention, the sum of the flow noise of the small induction nozzles 16 of several groups 21 is lower than the sum of the flow noise of the large nozzles known from the prior art, the number of which corresponds to the number of groups 21. An insertion loss, ie a reduction in the channel noise radiating through, is also more favorable with the smaller induction nozzles 16 according to the invention.

Furthermore, with regard to the large induction nozzles mentioned, which are part of the prior art, it should be noted that they induce more secondary air over a certain housing width than a larger number of evenly distributed small induction nozzles, i.e. the larger nozzles induce a greater cooling/heating capacity on one upstream heat exchanger. The advantages and disadvantages listed above with regard to smaller as well as larger induction nozzles are bundled according to the invention with regard to merely advantageous effects by grouping several induction nozzles 16 (with a correspondingly small cross section). This means that the positive acoustic properties of the smaller induction nozzles 16 according to the invention come into effect and there is also a positive induction effect that corresponds to the favorable induction effect of large nozzles, in that the smaller induction nozzles 16 are grouped according to the invention, so that the air jets 22 emerging from them form a common one Air jet, namely merge into the mentioned induction air jet 23, so that the effect of this induction air jet 23 corresponds to the effect of a jet from a large nozzle with regard to induction.

The geometry and arrangement of the individual induction nozzles 16 according to the invention depends on the nozzle size, the primary pressure, the volume flow and the injector length. However, if the person skilled in the art knows the procedure according to the invention, he can he can achieve optimal values through simple experiments.

According to the invention, at nozzle pressures of 100 to 300 Pa, the arrangement of the nozzles is as they are from the figure 4 emerges, namely a tripartite grouping provided.

According to a preferred embodiment of the invention according to figure 1 provided that the upper induction nozzles 16 can be opened or closed. Accordingly, according to figure 4 either one upper induction nozzle 16 per group 21 or two upper induction nozzles are closed, depending on which group is considered. The arrangement is preferably such that the opening and closing takes place by means of a slide 26 ( figure 1 ), which is slidably mounted with appropriate means and in the representation of figure 1 takes an open position. The slide 26 can be moved back and forth according to the double arrow 27 . A motorized device can be provided for this purpose, or it can be moved manually. If the slider 26 is pushed down, it covers the outlet openings 24 of the upper induction nozzles 16 so that no more air jets 22 can exit there. In this embodiment, however, it is provided that the lower row of induction nozzles 16 is not, as in figure 4 once have one and once two induction nozzles 16 per group 21, but there are always at least two induction nozzles 16 present, so that even when the upper row of induction nozzles 16 is covered, an air jet combination can take place. Alternatively, it can be provided that the induction nozzles 16 of the upper row are not completely closed, but only partially. In such a case, it is then also permissible that the bottom row in a group 21 only an induction nozzle 16 has. By closing and opening or partially closing the outlet openings 24 of the corresponding induction nozzles 16, the induction effect and thus the cooling or heating capacity of the ventilation device 1 can be controlled or regulated.

Claims (9)

1. Ventilation device in the form of an induction device, comprising a housing (4), a plurality of induction nozzles operated with air, in particular with primary air, the induction nozzles (16) being designed and/or arranged in groups, characterized in that the groups are formed in such a way that air jets (22) emerging from the induction nozzles (16) of one group (21) or of each of the groups (21) merge to form or each form only one induction air jet (23) within the housing (4), wherein each of the groups (21) comprises three induction nozzles (16), wherein the induction nozzles (16) of each group (21) have a smaller distance to each other than the distance between adjacent groups (21) and wherein the respective distance of adjacent discharge openings (24) of induction nozzles (16) of the same group (21) has the dimension D, wherein the respective distance of the discharge openings (24) up to the associated merging point (25) of the associated air jets (22) has the dimension H, and wherein the following relationship applies at nozzle pressures of 100 to 300 Pa: $$\mathrm{H}=\left(1\mathrm{to}5\right)\times \mathrm{D}.$$

   
2. Ventilation device according to claim 1, characterized in that the induction nozzles (16) of each group (21) are arranged spatially to each other.
3. Ventilation device according to any one of the preceding claims, characterized in that the discharge angle of the air jet of each induction nozzle of the same group (21) is in the range of 10° to 30°, in particular has a magnitude of 20°.
4. Ventilation device according to any one of the preceding claims, characterized in that at least one induction nozzle (16) of the induction nozzles (16) of at least one group (21) can be opened or closed.
5. Ventilation device according to any one of the preceding claims, characterized in that the induction nozzle (16) to be opened or closed is further away from a heat exchanger (5) of the induction device (2) than the other induction nozzles (16) of the same group (21).
6. Ventilation device according to any one of the claims 4 and 5, characterized in that the induction nozzle (16) is opened or closed by means of a slider (26) which interacts with the discharge opening (24) of the induction nozzle (16).
7. Method for operating a ventilation device in the form of an induction device according to any one or more of the preceding claims, comprising a plurality of induction nozzles which are operated with air, in particular with primary air, and from which air jets emerge, characterized in that the air jets (22) from a plurality of induction nozzles (16) forming a group (21) or forming a group (21) each are configured in such a way that they merge with one another to form or form each only one induction air jet (23).
8. Method according to claim 7, characterized in that the air jets (22) of the same group (21) of induction nozzles (16), which are preferably of the same type and/or preferably of the same size, are designed in such a way that the induction effect of the induction air jet (23) formed is as great or almost as great as the induction effect of a fictitious, single, cross-sectionally large induction nozzle blowing out a fictitious air jet at the same volume flow of the induction air jet (23) of the group ( 21) of induction nozzles (16) and fictitious air jet and at the same air pressure, in particular primary air pressure, with which the induction nozzles (16) and the fictitious induction nozzle are supplied.
9. Method according to any one of the claims 7 and 8, characterized in that the air jets (22) of the same group (21) of induction nozzles (16), which are preferably of the same type and/or preferably of the same size, are designed in such a way that the sound pressure level of these induction nozzles (16) - when a specific quantity of conveyed air, in particular primary air quantity, flows through them - is smaller than or at most the same as the sound pressure level of a fictitious, single, cross-sectionally large induction nozzle blowing out a fictitious air jet at the same conveyed air quantity, in particular primary air quantity, and at the same volume flow of the induction air jet (23) of the group (21) of induction nozzles (16) and fictitious air jet and/or at the same induction effect of induction air jet (23) and fictitious air jet.

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