EP0606078B1 - Air outlet for air treatment installations - Google Patents

Abstract

An air outlet for air treatment installations is connected at its end via a supply-air connection (3) to an air-duct network and consists of an outer, air-permeable shell (1) and an inner air-permeable shell (2) arranged concentrically thereto, in which one or more horizontal restricting rings (10, 11) are arranged. Inside the inner shell (2) is arranged an inner pipe (6) through which an axial flow can pass, the flow-through cross-section of which inner pipe is variable and its end facing away from the supply-air connection (3) being open. <IMAGE>

Description

The invention relates to a source air passage for ventilation systems, the one end can be connected to an air duct system via a supply air connection. Of the Source air passage consists of an outer air-permeable jacket and one inside concentrically arranged inner breathable jacket. In the source air passage at least one horizontal aperture ring is arranged.

Such air outlets are generally known and are usually on the Floor installed so that the supply air from the air outlet to the people inside of the room to be air-conditioned only cover a relatively short distance got to. This route leads in particular to high and polluted areas Industrial halls due to the relatively low-load area near the floor. To this Type, the supply air is mixed relatively little with indoor air contaminated with pollutants before it is inhaled by the people. As a rule, a coupling in industrial halls of the place where the heat and pollutants originate, the released ones increase Pollutants in the convective heat flow up to the hall roof, where they from Exhaust system can be recorded. In order not to disturb this material flow, the source air diffusers must be the supply air to the lounge area with low air speed feed and add volume to the ascending stream, so none Recirculation of polluted indoor air from higher hall areas in the Work or stay area takes place.

So that the supply air emerging from a source air passage in the lounge area remains, there is a higher density and therefore a lower temperature than the supply air the indoor air required. The beam pulse cannot be used for this because he for the reasons mentioned to avoid disturbing the ascending pollutant-enriched Thermal currents on machines must be kept low. Further the air volume flow into the supply air induced from the room decreased.

A source air passage of the generic type is known from DE-OS 40 37 287. With this Known source air passage is the supply air inside the cylindrical, perforated jacket evenly deflected by horizontal and vertical internals made of perforated plates and fed horizontally to the room to be air-conditioned. The supply air receives through the higher Density due to the low temperature after the horizontal outlet from the source air outlet a speed component directed towards the floor. This is reinforced by the Coanda effect of the floor. This causes a constriction of the supply air layer with a considerable Air speed increase by a factor of 2 to 3 due to drafts and an increased Recirculation of polluted indoor air is the result.

Another disadvantage of known source air diffusers is that they do not heat them up a room or an industrial hall can be used, as the one required for heating warmer supply air rises to the roof immediately due to the low outlet speed and is therefore not effective in the lounge area. Supply air temperatures above the room air temperature also occur in summer because most industrial halls do not have a mechanical one Supply air cooling are equipped. Here, too, there is the effect that the warmer supply air flows immediately Roof rises and the people only partially and also via recirculation with pollutants is loaded again.

From DE-A-2718760 is an air outlet to be used as a table outlet for ventilation and air conditioning systems known with an air flow from bottom to top, the air outlet with an air inlet and housing provided with air outlet openings. The air intake opens into a control chamber with a perforated wall section a first outflow chamber is adjacent. In the control chamber there is a bellows shut-off and throttling means arranged with which the air flow from the inlet through a perforated Cylinder can be throttled as desired in the first outflow chamber.

The first outflow chamber is provided with horizontally blowing air openings and over at least an opening connected to a second outflow chamber adjacent to the control chamber. This second outflow chamber has a plurality of vertically upwardly blowing air openings Finally, the air outlet also has an actuable by the shut-off and throttle element biased valve that is open when the bellows the inner cylinder blocked and thus a direct connection between the vertically blowing air vents manufactures.

Since this known air outlet, however, only one horizontal and one vertically upward, however no vertical or diagonally downward outflow direction possible and also the adjustment the discharge characteristic causes a restriction of the supply air flow, this air passage unsuitable for use in source air systems.

Through that arranged inside the source air passage, preferably in its The flow behavior can be changed through the flow cross-section of the tubular guide element influence the supply air emerging from the source air passage, namely different, depending on whether the temperature of the supply air below or above the The temperature of the room air is.

If the supply air is too low, the pipe-shaped guide element will maximum open flow cross-section generates an air flow whose Speed on the outer jacket increases from bottom to top and their blow-out direction is directed obliquely upwards. The entire flow can be additional a twist can be superimposed. This way, no one finds in the lounge area Air speed increase due to cold air drop instead.

If the supply air temperature is higher than the room air temperature, the flow cross-section can of the tubular guide element can be reduced to zero, resulting in a Air flow is generated at the outlet from the source air passage, its outlet direction is directed downwards and their speed from top to bottom increases significantly. This counteracts the rise of the warmer supply air.

Fig. 1

einen Längsschnitt durch ein erstes Ausführungsbeispiel;

Fig. 2

eine Draufsicht auf das Ausführungsbeispiel gemäß Fig. 1;

Fig. 3

einen Längsschnitt durch ein zweites Ausführungsbeispiel;

Fig. 4

einen Querschnitt nach der Linie IV - IV des Ausführungsbeispiels gemäß Fig. 3;

Fig. 5

einen Querschnitt nach der Linie V - V der Fig. 3;

Fig. 6

einen Längsschnitt durch ein drittes Ausführungsbeispiel;

Fig. 7

einen Querschnitt nach der Linie VII - VII des Ausführungsbeispiels gemäß Fig. 6;

Fig. 8

einen Querschnitt nach der Linie VIII - VIII der Fig. 6;

Fig. 9

einen Längsschnitt durch ein viertes Ausführungsbeispiel;

Fig. 10

einen Querschnitt nach der Linie X - X des Ausführungsbeispiels gemäß Fig. 9;

Fig. 11

einen Querschnitt nach der Linie XI - XI der Fig. 9;

Fig. 12 und 13

Strömungsbilder unter Verwendung eines erfindungsgemäßen Quellluftdurchlasses.

Exemplary embodiments of source air passages according to the invention are shown in the drawing and explained in more detail below. It shows:

Fig. 1

a longitudinal section through a first embodiment;

Fig. 2

a plan view of the embodiment of FIG. 1;

Fig. 3

a longitudinal section through a second embodiment;

Fig. 4

a cross section along the line IV - IV of the embodiment of FIG. 3;

Fig. 5

a cross section along the line V - V of Fig. 3;

Fig. 6

a longitudinal section through a third embodiment;

Fig. 7

a cross section along the line VII - VII of the embodiment of FIG. 6;

Fig. 8

a cross-section along the line VIII - VIII of Fig. 6;

Fig. 9

a longitudinal section through a fourth embodiment;

Fig. 10

a cross section along the line X - X of the embodiment of FIG. 9;

Fig. 11

a cross section along the line XI - XI of Fig. 9;

12 and 13

Flow patterns using a source air outlet according to the invention.

1 and 2 show, the source air passage consists of an outer air-permeable cylindrical shell 1 and an inner concentrically arranged therein air-permeable cylindrical jacket 2, both preferably made of a perforated plate are made. The source air outlet is at the top except for the cross section for a supply air connection 3 closed, which can be connected to an air duct network, not shown.

The source air passage is also provided with a closed bottom 4 and stands on the floor 5 of the hall to be air-conditioned or the other to be air-conditioned Space.

In the lower half of the source air diffuser is concentric with and in a side Distance from the inner jacket 2, a tubular guide element open on both sides 6 arranged. In the area of the upper end of the tubular guide element 6 a flap 7 is attached to change its flow cross-section, with which the tubular guide element 6 is also completely opened or closed can be. The flap 7 is pivotable about an axis in the tubular Guide element 6 mounted and can be mechanically with the help of a lever or by means of an electrically or pneumatically acting one acting on the axis Drive 8 are pivoted.

In the lower part of the tubular guide element 6 is to generate turbulence a swirl blade insert 9 is arranged. To shift its scope the swirl blade insert 9 can be vertically displaceable. The blades can also of the swirl blade insert 9 can be rotated in its angular position in order to Change twist strength.

In the interior of the inner shell 2 are above the tubular guide element 6 aperture rings 10, 11 arranged horizontally, which have a central through opening and have an outer ring surface. The ring surface of the upper aperture ring 10 is closed while that of the lower aperture ring 11, the pinhole ring is formed, has holes.

In the annular space between the tubular guide element 6 and the inner jacket 2, a further aperture ring 12 is arranged horizontally, so that it extends over the space extends that he this in two superimposed annular chambers 13, 14th divides.

The ring surface of this further aperture ring 12 is in the first exemplary embodiment described here perforated.

This differs from the previously described first exemplary embodiment in FIGS Fig. 3 to 5 illustrated second embodiment essentially in that the Function of the flap 7 and that of the aperture ring 12 by two horizontal and tight discs 15, 16 arranged one above the other is taken over. These divide the Annulus between the tubular guide member 6 and the inner jacket 2 in the Annular chambers 13 and 14 and the tubular guide element 6 in an upper and a lower tubular guide element section. Breakthroughs 17 in the rotatable mounted upper disc 15 correspond to openings 18 in the rigidly arranged Disc 16, so that depending on the rotational position of the disc 15, the openings 17 more or less aligned with the openings 18 or the openings 17 and 18 are blocked with breakthrough-free areas of disks 16 and 15, respectively.

In the third exemplary embodiment according to FIGS. 6 to 8, the tubular guide element is 6 'from an upper section which is flared upwards and a cylindrical one combined lower section. Between the two sections there are disks 15 ' and 16 'arranged horizontally. Deviating from the second embodiment according to 3 to 5, the upper disc 15 'and 16' is not congruent. The disc 15 ' is rotatably mounted so that openings 17 'in the upper disc 15' with openings 18 'and / or 19' more or less aligned or with breakthrough-free Areas of the disks 15 'and 16' are blocked. With fully closed openings 18 'through the segments of the disc 15' are the openings 19 'of the disc 16 'fully open.

In the fourth exemplary embodiment according to FIGS. 9 to 11, the tubular guide element is 6 '' conical from bottom to top. The annulus in the annulus 13 and 14 dividing disks 15 "and 16" are gear-shaped, so that the tooth-gap-shaped openings 17 '' in the rotatably mounted disc 15 '' the tooth gap-shaped openings 18 '' in the rigid disk 16 '' more or can align less or through tooth-shaped areas of the disk 16 '' or 15 '' can be locked.

The supply air supplied via the supply air connection 3 enters the interior of the interior Jacket 2 and enters through the outer jacket 1 in the air-conditioned hall out. With the tubular cross section which can be changed in terms of its flow Guide element 6, 6 ', 6 ", the air flow can be influenced so that the in the Fig. 12 and 13 set reproduced flow patterns.

If the temperature of the supply air is below the room air temperature, the flow cross-section is of the tubular guide element 6 released so that it from a Part of the incoming supply air is flowed through vertically, while the rest of the supply air radially emerges through the outer jacket 1 (FIG. 12). The tubular guide element 6 partial flow flowing through is deflected at the bottom 4 of the source air passage, enters the lower annular chamber 14 and emerges from the lower part of the outer Coat 1 off. In this way, the total exiting from the source air passage is maintained Inlet air shown in FIG. 12, slightly upward flow direction. Since the supply air is colder than the room air, the supply air drops due to the higher density in the common area.

If the supply air is too low compared to the room air, this is to be avoided a reduction in comfort makes sense, the supply air has a swirl of adjustable size overlay to adjust the supply air temperature faster to the room air temperature. This swirl is arranged in the tubular guide element 6 Swirl blade insert 9 generated. In the heating case discussed below The swirl blade insert 9 would supply air temperatures above the room air temperature undesirably reduce the penetration depth of the supply air. However, this will prevented by closing the tubular guide element 6, whereby the twist will be annulled.

If the temperature of the supply air is higher than the room air temperature when heating, then the tubular guide element 6 blocked so that it is not flowed through. As in Fig. 13, an air flow becomes thereby on the outside of the source air passage with a strongly downward air outlet direction and one towards the floor 5 generates increasing air speed. This will make you counteracted the rapid rise of the warm supply air. The resulting ones increased indoor air velocities can be accepted, since the Heating the warmer supply air is not perceived as a draft and the heating process in usually takes place before the start of work. If the supply air temperature is higher in summer the indoor air temperature, the blow-out characteristic according to FIG. 13 also becomes chosen. In this case there are higher air velocities at high indoor air temperatures not harmful, but even desirable.

Claims (13)

1. A rising air duct for ventilation and air-conditioning installations, which can be attached at one end via a fresh air connection (3) to an air duct network and consists of an outer, air-permeable casing (1) and of an inner air-permeable casing (2) concentrically disposed therein, and in which at least one horizontal diaphragm ring (10, 11) is disposed, characterised in that a tubular guide element (6, 6', 6''), through which axial flow can occur, is disposed inside the inner casing (2) oriented concentrically therewith, the end of which guide element which is remote from the fresh air connection (3) is open, wherein an annular space through which flow can occur is formed between the inner casing (2) and the tubular guide element (6, 6', 6'').
2. A rising air duct according to claim 1, characterised in that the flow cross-section of the guide element (6, 6', 6") can be varied.
3. A rising air duct according to claim 1 or 2, characterised in that the tubular guide element (6, 6', 6'') is disposed so that it is adjustable in an axial direction over at least part of the inner casing and/or is constructed so that its length can be varied.
4. A rising air duct according to claims 1 to 3, characterised in that a swirl blade insert (9) is disposed in the tubular guide element (6, 6', 6").
5. A rising air duct according to claim 4, characterised in that the swirl blade insert (9) is axially displaceable and/or comprises swirl blades which can be twisted.
6. A rising air duct according to any one of claims 1 to 5, characterised in that the flow cross-section of the tubular guide element (6, 6', 6") can be varied by a swivelling shutter (7) associated therewith.
7. A rising air duct according to any one of claims 1 to 5, characterised in that a pair of discs is associated with the tubular guide element (6, 6', 6") and, depending on the position of a rotatable disc (15, 15', 15") in relation to a fixed disc (16, 16', 16''), cut-outs or openings (17, 18, 17', 18', 19',17", 18") in both discs (15, 16, 15', 16', 15", 16") can be brought into or out of coincidence.
8. A rising air duct according to any one of claims 1 to 5, characterised in that an iris diaphragm or a tiltable diaphragm ring is associated with the tubular guide element (6, 6'. 6").
9. A rising air duct according to any one of claims I to 8, characterised in that the flow cross-section of the annular space between the inner casing (2) and the tubular guide element (6, 6', 6'') can be varied.
10. A rising air duct according to claim 9, characterised in that the annular space is subdivided by a diaphragm ring and/or by a swirl blade ring into two annular chambers (13, 14) disposed one above the other.
11. A rising air duct according to claim 10, characterised in that the diaphragm ring disposed in the annular space consists of a pair of annular discs (15", 16"), and depending on the position of a rotatable annular disc in relation to a fixed annular disc cut-outs or openings in both annular discs can be brought into or out of coincidence.
12. A rising air duct according to claim 10, characterised in that the diaphragm ring disposed in the annular space is constructed in the manner of an iris diaphragm.
13. A rising air duct according to any one of claims I to 12, characterised by at least one electric or pneumatic drive (8), by which the tubular guide element (6, 6', 6") and/or the shutter (7) and/or the diaphragm ring (12) and/or a disc (15, 16, 15', 16', 15", 16") of the pair of discs and/or the swirl blade insert (9) and/or a swirl blade ring inserted in the annular space between the inner casing (2) and the guide element (6, 6', 6") can be adjusted.

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