EP0606078A2 - 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, which can be connected at one end to an air duct system via a supply air connection. The source air passage consists of an outer air-permeable jacket and an inner air-permeable jacket arranged concentrically therein. At least one horizontal diaphragm ring is arranged in the source air passage.

Such air outlets are generally known and are usually installed standing on the floor, so that the supply air from the air outlet to the people within the room to be air conditioned only has to travel a relatively short distance. This route leads in particular in high and polluted industrial halls through the relatively lightly loaded area near the floor. In this way, the supply air is mixed relatively little with polluted indoor air before it is inhaled by the people. Since there is usually a coupling of heat and pollutant origin in industrial halls, the released pollutants rise in the convective heat flow to the roof of the hall, where they are captured by the exhaust system. In order not to disturb this material flow, the source air passages must supply the supply air to the lounge area at a low air speed and add volume to the rising material flow, so that there is no recirculation of polluted indoor air from higher hall areas into the work or lounge area.

In order for the supply air exiting a source air passage to remain in the occupied area, a higher density and therefore a lower temperature of the supply air than the room air is required. The beam pulse cannot be used for this, since for the reasons mentioned it has to be kept low in order to avoid a disturbance of the rising pollutant-enriched thermal currents on machines. This also reduces the air volume flow into the supply air induced from the room.

A source air passage of the generic type is known from DE-OS 40 37 287. In this known source air passage, the supply air inside the cylindrical, perforated jacket is evenly deflected by horizontal and vertical internals consisting of perforated sheets and fed horizontally to the room to be air-conditioned. The supply air receives a velocity component directed towards the floor due to the higher density due to the lower temperature after the horizontal outlet from the source air passage. This is reinforced by the Coanda effect of the floor. This causes the supply air layer to constrict with a significant increase in air speed by a factor of 2 to 3. Drafts and increased recirculation of polluted indoor air are the result.

Another disadvantage of known source air diffusers is that they cannot be used to heat up a room or an industrial hall, since the warmer supply air required for heating rises to the roof immediately due to the low outlet speed and is therefore not effective in the living area. Supply air temperatures above the room air temperature also occur in summer because most industrial halls are not equipped with mechanical supply air cooling. Here, too, there is the effect that the warmer supply air rises to the roof and is only partially returned to the people and also contaminated with recirculation.

The invention has for its object to design the generic source air passage so that drafts are avoided and that heating of the room to be air-conditioned is possible.

This object is achieved in a generic source air passage according to the invention by the characterizing features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

Due to the tubular guide element arranged in the interior of the source air passage, preferably with a flow cross-section that can be changed, the flow behavior of the supply air emerging from the source air passage can be influenced differently, depending on whether the temperature of the supply air is below or above the temperature of the room air.

If the supply air is under-temperature, an air flow is generated by the tubular guide element with a maximum open flow cross-section, the speed of which increases on the outer jacket from bottom to top and the blow-out direction is directed obliquely upwards. A swirl can also be superimposed on the entire flow. In this way, there is no increase in air speed due to cold air drop in the occupied area.

If the supply air temperature is higher than the room air temperature, the flow cross-section of the tubular guide element can be reduced to zero, which creates an air flow at the outlet from the source air passage, the outlet direction of which is directed downwards and the speed of which increases significantly from top to bottom. 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 jacket 1 and an inner air-permeable cylindrical jacket 2 arranged concentrically therein, both of which are preferably made of a perforated plate. The source air passage is closed at the top except for the cross section for a supply air connection 3, which can be connected to an air duct network (not shown).

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

A tubular guide element 6, which is open on both sides, is arranged concentrically with and at a lateral distance from the inner jacket 2 in the lower half of the source air passage. In the area of the upper end of the tubular guide element 6, a flap 7 is attached in order to change its flow cross-section, with which the tubular guide element 6 can also be opened or closed completely. The flap 7 is pivotally mounted in the tubular guide element 6 via an axis and can be pivoted mechanically with the aid of a lever or by means of an electrically or pneumatically acting drive 8 acting on the axis.

A swirl vane insert 9 is arranged in the lower part of the tubular guide element 6 in order to generate turbulence. The swirl vane insert 9 can be vertically displaceable to shift its effective range. The blades of the swirl blade insert 9 can also be designed to be rotatable in their angular position in order to change the swirl strength.

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

In the annular space between the tubular guide element 6 and the inner casing 2, a further diaphragm ring 12 is arranged horizontally, which extends over the intermediate space in such a way that it divides it into two annular chambers 13, 14 lying one above the other.

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

The second exemplary embodiment shown in FIGS. 3 to 5 differs from the previously described first exemplary embodiment essentially in that the function of the flap 7 and that of the diaphragm ring 12 is taken over by two horizontal disks 15, 16 arranged one above the other. These divide the annular space between the tubular guide element 6 and the inner jacket 2 into the annular chambers 13 and 14 and the tubular guide element 6 into an upper and a lower tubular guide element section. Openings 17 in the rotatably 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 are more or less aligned with the openings 18 or the openings 17 and 18 with areas of the openings which are not open Disks 16 and 15 are blocked.

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

In the fourth exemplary embodiment according to FIGS. 9 to 11, the tubular guide element 6 ″ is conically narrowed from bottom to top. The disks 15 ″ and 16 ″ dividing the annular space into the annular chambers 13 and 14 are designed in the form of a gear wheel, so that the tooth-gap-shaped openings 17 ″ in the rotatably mounted disc 15 ″ with the tooth-gap-shaped openings 18 ″ in the rigid disk 16 ′ 'can be aligned more or less or can be blocked by tooth-shaped areas of the disk 16''or15''.

The supply air supplied via the supply air connection 3 enters the interior of the inner casing 2 and exits through the outer casing 1 into the hall to be air-conditioned. The air flow can be influenced in such a way that the flow-shaped cross-section of the tubular guide element 6, 6 ', 6' 'can be influenced in such a way that the flow patterns shown in FIGS. 12 and 13 are established.

If the temperature of the supply air is below the room air temperature, the flow cross-section of the tubular guide element 6 is released so that part of the supply air supplied flows vertically, while the rest of the supply air exits radially through the outer jacket 1 (FIG. 12). The partial flow flowing through the tubular guide element 6 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 jacket 1. In this way, the total supply air emerging from the source air passage receives the slightly upward flow direction shown in FIG. Since the supply air is colder than the room air, the supply air sinks into the living area due to the higher density.

If the supply air is too low compared to the room air, to avoid a reduction in comfort, it makes sense to overlay the supply air with a swirl of adjustable size in order to adjust the supply air temperature more quickly to the room air temperature. This swirl is generated with the help of the swirl vane insert 9 arranged in the tubular guide element 6. In the heating case subsequently discussed at supply air temperatures above the room air temperature, the swirl blade insert 9 would undesirably reduce the penetration depth of the supply air. However, this is prevented by closing the tubular guide element 6, as a result of which the swirl is eliminated.

If the temperature of the supply air is above the room air temperature in the heating case, the tubular guide element 6 is blocked so that it is not flowed through. As shown in FIG. 13, an air flow with a strongly downward air outlet direction and an increasing air speed in the direction of the floor 5 is thereby generated on the outside of the source air passage. This counteracts a rapid rise in the warm supply air. The resulting higher room air velocities can be accepted as the warmer supply air is not perceived as a draft during heating and the heating process usually takes place before starting work. If the supply air temperature in summer is higher than the room air temperature, the blow-out characteristic according to FIG. 13 is also selected. In this case, higher air speeds are not harmful at high indoor air temperatures, but are even desirable.

Claims (13)

Source air outlet for ventilation and air conditioning systems, which can be connected to an air duct network at one end via a supply air connection (3) and consists of an outer air-permeable jacket (1) and an inner air-permeable jacket (2) arranged concentrically therein and in which at least one horizontal blind ring (10 , 11) is arranged, characterized in that an axially flowable tubular guide element (6, 6 ', 6' ') is arranged within the inner jacket (2), the end of which facing away from the supply air connection (3) is open. Source air passage according to claim 1, characterized in that the flow cross-section of the guide element (6, 6 ', 6' ') can be changed. Source air passage according to claim 1 or 2, characterized in that the tubular guide element (6, 6 ', 6' ') is arranged so as to be adjustable in the axial direction over at least part of the height of the inner jacket and / or is of variable length. Source air passage according to claims 1 to 3, characterized in that a swirl vane insert (9) is arranged in the tubular guide element (6, 6 ', 6' '). Source air passage according to claim 4, characterized in that the swirl vane insert (9) is displaceable in the axial direction and / or has rotatable swirl vanes. Source air passage according to one of claims 1 to 5, characterized in that the flow cross-section of the tubular guide element (6, 6 ', 6'') can be changed by means of a pivotable flap (7) assigned to it. Source air passage according to one of claims 1 to 5, characterized in that a pair of disks is assigned to the tubular guide element (6, 6 ', 6' ') and, depending on the position of a rotatable disk (15, 15', 15 ''), to one fixed disc (16, 16 ', 16' ') cutouts 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 cover. Source air passage according to one of claims 1 to 5, characterized in that the tubular guide element (6, 6 ', 6' ') is assigned an iris diaphragm or a tiltable diaphragm ring. Source air passage according to one of claims 1 to 8, characterized in that the flow cross-section of an annular space between the inner jacket (2) and the tubular guide element (6, 6 ', 6' ') can be changed. Source air passage according to claim 8 or 9, characterized in that the annular space is divided into two annular chambers (13, 14) arranged one above the other by an orifice ring and / or a swirl vane ring. Source air passage according to claim 10, characterized in that the diaphragm ring arranged in the annular space consists of a pair of annular disks (15 '', 16 '') and, depending on the position of a rotatable annular disk, cutouts or openings in both annular disks can be brought into or out of coverage in a fixed annular disk are. Source air passage according to claim 10, characterized in that the diaphragm ring arranged in the annular space is designed in the manner of an iris diaphragm. Source air passage according to one of claims 1 to 12, characterized by at least one electrical or pneumatic drive (8) through which the tubular guide element (6, 6 ', 6' ') and / or the flap (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 one in the annular space between the inner casing (2) and the swirl vane ring used for the guide element (6, 6 ', 6' ') is adjustable.

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