DE4446843A1 - Waste air collector duct for ventilation and air conditioning installations - Google Patents

Abstract

The air collector has sequential duct sections (3, 4) which interengage with their facing ends (5, 6) on a presettable length (7), at least partly, or form mutual transition zones. The duct section have through flow cross-sections (8, 9), increasing with sudden cross-sectional addition. The widening section (11) is open towards the roof or space (12) and is determined by the interengaging, or overlapping cross-sectional increases between the subsequent sections. Pref. the widening section of each cross-sectional increase (10) is formed by an extension torque at downstream end (5) of the upstream duct section (3).

Description

The invention relates to an exhaust air collecting duct for ventilation and Air conditioning or the like. And has exhaust air ducts to the subject, which is created from channel sections be an increasing through in the direction of flow of air have a cross section.

Known types of construction and functions of exhaust air collecting ducts of this type are shown and described, among other things, in DE-Z "Ki Climate + Refrigeration Engineer", booklet 7-8 / 75, pages 245 to 252, picture 6 and picture 12, in DE-Z "HLH heating, ventilation house technology", issue 3/76, pages 88 to 92, pictures 3, 4 and 7 and in DE-Z "health engineer", issue 4/79, pages 101 to 106, issue 10/79, Pages 302 to 304, 317 to 320, issue 12/79, pages 361 to 370 with pictures 6 to 12 as well as 16, 20 and 21.

With such exhaust air collecting ducts, it often comes down to a larger channel length through the same number of openings Extract air volume flows. Because of the pressure distribution in the channel - Friction losses lead to increasing vacuum at the end of the duct towards - but this desired even distribution is rarely reached. Conditional remedy can be reduced cross-section of the public create, but with the consequence that increased speed leads to increased noise production and higher energy loss.

Also through propellant nozzles in the exhaust air collection duct (see, for example, "Bags book for heating and air conditioning technology "by Regnagel-Sprenger-Hörmann, 65th edition, R. Oldenburg-Verlag, Munich, page 1109) tries to remedy the situation.  

In particular, the installation of drive nozzles in the channel cross-section turns out to be complex and therefore expensive.

The invention therefore aims to create a design for Exhaust air collecting ducts, with which the extraction of air volume flow with a distribution that is as even as possible without any essential achieve additional constructional effort or can be accomplished.

According to the invention, it is important that the exhaust air collecting duct easy to set up using conventional channel sections ten that the same air volume flows over each other alone have a larger duct length suctioned off.

Is therefore used according to the invention
Exhaust air collection duct for ventilation and air conditioning systems or the like, consisting of duct sections which have an increasing flow cross section in the direction of flow of the air,

• - With successive channel sections with their mutually facing ends each on a predetermined length at least partially interlocking or mutual Form coverage zones,
• - With the successive channel sections with it flow cross-section increasing in cross-sectional jumps are provided or equipped,
• - And with that of the interlocking or itself overlapping cross-sectional changes certain expansion area between the one another of the following channel sections towards the room as a whole is open.

The advantage of such an exhaust air collecting duct lies in the fact that there are very simple inflow openings for the Exhaust air, which act similar to the known propellant nozzles,  but with an overall more extend in the axial direction the flow course work and therefore a better effect than let them expect.

The principle of solution according to the invention is therefore based in principle that each where the exhaust air duct with a through a cross-sectional jump formed extension, this Expansion to the outside or to the room is not closed, there in each case forms an inflow opening for exhaust air. in the Principle, there are two channels in the area of each inflow opening Sections with different flow cross sections on each other.

In the case of an exhaust air collecting duct with a polygonal, in particular rectangular cross-section, can be the room side according to the invention open - i.e. defining an inflow opening area adjacent limitation of each cross-sectional jump of min at least one extension tongue at the downstream end of the stream upward channel section are formed, which in the stream protrudes upward end of the downstream channel section. It has proven to be advantageous if the extensions tongue firmly attached to the downstream end of the connects upstream channel section.

Another advantageous design for an exhaust air duct with polygonal, in particular rectangular cross section by realizing that the extension open on the room side area adjacent limitation of each cross-sectional jump of min least a U- or channel-shaped profiled channel piece which is from the upstream end of the downstream channel Section from the downstream end of the upstream channel Section overlaps. This design can be conveniently realize that the U-shaped or channel-shaped channel piece through flange connections to the upstream end of the stream downstream channel section is connectable.  

For exhaust air collection ducts with a rectangular flow cross-section it is recommended to use channel sections create which in a cross-sectional direction - width or height - have a matching dimension. It can then be invented according to the upstream end of each downstream channel Section over its entire circumference with a connection be flanged during the downstream end of the stream upward channel section only on three circumferential sides a ver has flange. On the other hand then carries the U- or gutter evenly profiled channel section at its downstream end if a connection flange on three sides. This in such a way that the three-sided connection flanges on the upstream channel Section and on the U- or channel-shaped channel section complementary or together form a connecting flange, the then with the four-sided connection flange on the upstream towards the end of the downstream channel section in a cover position lets connect.

The channel-Ab successive in the flow direction of the air sections of an exhaust air collecting duct according to the invention can be with regard to their dimensions determining the flow cross-section gene easily interpret that in the area of the cross section jumps there is the possibility of inflow openings for exhaust air in the exhaust air collecting duct in different arrangement and configuration to accomplish. It is conceivable to have such inflow openings an exhaust air collecting duct with a rectangular cross-section on one side, to be provided on two sides, three sides and also four sides and thereby to set up their respective opening widths as required. At Exhaust air collection ducts with a round flow cross-section of the duct Sections can be made through the shape for the inflow openings centric or more or less eccentric arrangement the following channel sections vary as required.  

In all possible designs for the exhaust air It is important, however, that the inflow end of each Extension area of each inflow opening open on the room side has aerodynamically designed leading edge, z. B. with a rounded or angled, if necessary flow opening is provided transverse widening. The last one mentioned design form of expansion can be a by upstream end of the channel section existing connection flange result.

It is for a streamlined design of each inflow opening but also recommended, the end edge of the inlet opening adjacent wall or walls of the upstream channel section run as smoothly as possible so that there is no additional flow can form an obstacle. For example, a bevel or Flanging by 180 °, that is to say, a sheet metal doubling is provided will. But it is also possible to use this end edge with one if possible to equip narrow, aerodynamic plug-in profile.

If the momentum of the lateral inflow is to be increased it is also possible to reduce the cross section of each inflow opening gladly. This can be achieved, for example, by the extension tongue or the corresponding wall part on the downstream End of the upstream channel sections (obtuse-angled) after is kinked on the outside. This creates at the downstream end of the upstream channel section a diffuser and in the Inflow opening a nozzle. A similar effect can also be seen reach if the nozzle cross-section is installed by an additional blockage is reduced. Both variants can be Realize the use of easily manufactured sheet metal parts. For In special cases, it may even be appropriate to block or To build sheet metal parts so that they can be adjusted so that have different cross sections set.

Embodiments of exhaust air having the features of the invention Collection channels are detailed below using the drawing explained. Show

Fig. 1 in a purely schematic longitudinal section of the basic principle of having an air inflow opening equipped exhaust collection passage,

FIG. 2 is a practical design for an exhaust-Sam English Channel with air-inlet opening,

Fig. 3 shows another training option for an exhaust air collecting duct with an exhaust air inflow opening

Fig. 4 to 11 eight different design options for exhaust air collecting ducts with a polygonal flow cross-section in the area of an exhaust air A flow opening, the

Figures 12 and 13 a circular flow cross Ab. Air collection duct in the region of an exhaust air-flow orifice and the A

Fig. 14 to 20 different in longitudinal section 4 Ausgestaltungs possibilities of the exhaust collection passage in the loading of an exhaust air-inflow rich.

Fig. 1 of the drawing shows a schematically simplified longitudinal sectional schematic representation of a portion of an exhaust air collecting duct 1 , as it is used for example for ventilation and air conditioning systems or the like. The direction of flow of the air through the exhaust air collecting duct 1 is indicated by the arrow 2 . Each exhaust air collecting duct 1 is assembled from a larger number of duct sections lined up in the flow direction of air 2 , only two successive duct sections 3 and 4 being shown in FIG. 1.

It can also be seen from FIG. 1 that the successive channel sections 3 and 4 with their mutually facing ends 5 and 6 each at least partially interlock or form mutual overlap zones over a predeterminable length 7 .

In Fig. 1, the downstream end 5 is shown the upstream channel section 3 as well as the upstream end 6 of the downstream channel section 4. Fig. 1 also makes it clear that two successive channel sections 3 and 4 are used with increasing cross-sectional flow cross-sections, in Fig. 1 - only for example - different cross-sectional heights 8 and 9 of the two channel sections 3 and 4 can be seen. The two cross-sectional heights 8 and 9 of the channel sections 3 and 4 differ by the cross-sectional jump 10 .

The cross-sectional jump 10 between the channel sections 3 and 4 which engage or overlap over the length 7 delimits an expansion area 11 which is open to the upstream end 6 of the downstream channel section 4 , for the purpose there to form an exhaust air inflow opening 12 on the exhaust air collecting duct 1 towards the room, which acts under the action of the air moving in the flow direction 2 through the exhaust air collecting duct 1 in the manner of a so-called propellant nozzle, which acts at least substantially axially parallel to the exhaust air collecting duct nal 1 extends.

Basically, although the possibility to give the state shown in FIG. 1, the exhaust air-collection duct 1, the design shown there, ie, 7 each other to push the two channel sections 3 and 4 simply with their mutually facing ends 5 and 6 and the length and then connect them over the length 7 , for example by riveting, screwing or welding so that between them the extension area 11 with the exhaust air inflow opening 12 is delimited.

In the exhaust air collecting duct 1 shown in FIG. 2 of the drawing, the downstream end 5 of the upstream duct section 3 and the upstream end 6 of the downstream duct section 4 butt against one another and are optionally connected via their connecting flanges 13 and 14 a packing 15 coupled together. The lower transverse wall of the upstream duct section 3 is provided with an extension tongue 16 which projects the length 7 into the upstream end 6 of the downstream duct section 4 and there the extension region 11 with the exhaust air inflow opening 12 on the room side, determined by the cross section point 10 narrowed down.

It is also worth mentioning about the exhaust air collecting duct 1 according to FIG. 2 that the connecting flange 14 at the upstream end 6 of the downstream duct section 4 can extend around the entire circumference of the duct section 4 . On the other hand, the connecting flange 13 at the downstream end 5 of the upstream channel section 3 should only extend over those peripheral parts of the channel section 3 which lie above the extension tongue 16 . It is thereby prevented that the connecting flange 13 undesirably constricts the cross section of the exhaust air inflow opening 12 of the extension area 11 .

The exhaust-collection channel 1 of FIG. 3 is structured so that the downstream end 5 of the upstream passage portion 3 and the upstream end 6 of the downstream passage portion 4 in turn truncated abut against each other, wherein they dungsflansche about their Verbin 13 and 14, if necessary. with the interposition of a pack 15 you can be coupled together. Here, too, the connecting flange 14 extends around the entire circumference of the channel section 4 , while the connecting flange 13 runs only along three circumferential sides of the channel section 3 . The in the area of the cross-sectional jump 10 to the room side with an exhaust air inflow opening 12 opening area 11 is in this case of an additional component, namely a U-shaped or channel-shaped channel piece 17 , which from the upstream end 6 of the downstream channel section 4 lower region of the downstream end 5 on the upstream channel section 3 overlaps. Here, the U-shaped or channel-shaped channel piece 17 is coupled via a connecting flange 18 to the connecting flange 14 of the channel section 4 . The connecting flange 18 it extends on the outside along all three boundary walls of the channel piece 17th He and the connecting flange 13 of the channel section 3 are designed so that they complement each other, give each other a connecting flange 13/18 , which bring with the four-sided connecting flange 13 at the upstream end 6 of the downstream channel section 4 in cover position and then lets couple. The connecting flanges 13/18 can, however, also be made in one piece, so that the elements forming the extension area 11 then form a single molding.

FIGS. 4 to make it clear to 11 of the drawing, that a variant embodiment of the rich exhaust air-collecting channels can be 1, when taken with polygonal, in particular rectangular or square cross-section in use. Depending on the dimensions and the mutual assignment of the channel sections 3 and 4 , the expansion areas 11 can be delimited between them at the most varied locations and also with variable dimensions in order to form exhaust air inflow openings 12 . Only on one side to ordered expansion areas 11 can be seen in FIGS . 4 and 5. Respectively on two mutually averted sides lying extension regions 11 are shown in Figs. 6 and 7 be seen, while in Fig. 8, an angularly extending, and in FIG. 9, an approximately U-shaped profiled extension region 11 results. Finally, FIGS . 10 and 11 show that extending areas 11 can also be created around the entire polygonal cross-section if this should be desired with a rectangular or square flow cross-section of the exhaust air collecting duct 1 .

In Figs. 12 and 13 is finally seen that readily also the possibility of exhaust air collecting ducts 1 down with a circular flow cross-section in the sense of Fig discussed above. 1 so that an expansion between them region 11 to form an exhaust Inflow opening 12 is formed.

In Figs. 14 to 17 are each to see 3 and 4 between which EXISTING which jump in cross section 10 of each of the extension area formed by the 11, only those edge portions of the channel sections.

In the case of FIG. 14, both the end edge 19 at the downstream end 5 of the upstream channel section 3 and the end edge 20 at the upstream end 6 of the downstream channel section 4 are simply designed by flanging or doubling the plate by 180 ° that it receives an aerodynamically effective rounding.

Of FIG. 15 is mounted of the upstream passage portion 3, a flow-designed auxiliary profile 21 at the downstream end 5, while the upstream end 6 of the downstream passage portion 4 is designed as a large curvature radius having extension 22 to the end edge of the nineteenth

The arrangement according to FIG. 16 differs from that according to FIG. 15 in that instead of the curved extension 22, an obtuse-angled extension 23 has been replaced, while in FIG. 17 an extension 24 has been bent at right angles.

From Fig. 18 it can be seen that the extension tab 16 or its corresponding wall portion at the downstream end 5 of the upstream passage portion 3 at an obtuse angle at an angle α outwards can bend when it is desired to increase the momentum of the lateral inflow. This measure creates a diffuser 27 at the downstream end 5 of the upstream channel section 3 , while a nozzle 28 is formed in the extension area 11 .

Fig. 19 and Fig. 20, finally, show that the aforementioned effect can also be achieved by use of inserts 25 and 26 which can be molded from simple sheet metal blanks. These inserts 25 and 26 extend from the exhaust air inflow opening 12 beyond the end edge 19 of the extension tongue 16 into the downstream duct section 4 and are shaped in such a way that the smallest cross section of the extension region 11 lies approximately at the end edge 19 . From there, the inserts 25 and 26 again approach the wall of the channel section 4 .

Due to the adjustable arrangement and design of the inserts 25 and 26 in the extension area 11 , different cross sections can also be set there.

Reference list

1 exhaust air collecting duct
2 Direction of air flow
3 upstream channel section
4 downstream channel section
5 downstream end of the channel section 3
6 upstream end of the channel section 4
7 length
8 Cross-sectional height of the duct section 3
9 Cross-sectional height of the channel section 4
10 cross-sectional jump
11 Extension area
12 Exhaust air inlet opening
13 connecting flange
14 connecting flange
15 sealing pack
16 extension tongue
17 U-shaped or channel-shaped duct section
18 connecting flange
19 end edge
20 end edge
21 Additional profile
22 extension
23 extension
24 extension
25 use
26 use
27 diffuser
28 nozzle

Claims (8)

1. exhaust air collecting duct ( 1 ) for ventilation and air conditioning systems or the like, consisting of duct sections ( 3 , 4) which have an increasing flow cross-section in the direction of flow ( 2 ) of the air,

• - wherein successive channel sections ( 3, 4 ) with their ends ( 5 , 6 ) facing each other at least partially engage in each other over a predeterminable length ( 7 ) or form mutual overlap zones,
• - The successive channel sections ( 3, 4 ) are provided or equipped with flow cross-sections ( 8 , 9 ) which increase in cross-sectional jumps ( 10 ),
• - And wherein the of the interlocking or overlapping cross-sectional jumps ( 10 ) limited or certain expansion area ( 11 ) between the successive channel sections ( 3, 4 ) is open to the room ( 11, 12 ).

2. exhaust air collecting duct ( 1 ) with a polygonal, in particular rectangular cross-section, characterized in that the extension area ( 11 ) which is open on the room side is adjacent to the limitation of each cross-sectional jump ( 10 ) of at least one extension tongue ( 16 ) at the downstream ends ( 5 ) of the upstream Channel section ( 3 ) is formed, which protrudes into the upstream end ( 6 ) of the downstream channel section ( 4 ) ( Fig. 2). 3. exhaust air collecting duct according to claims 1 and 2, characterized in that the extension tongue ( 16 ) integrally fixed to the downstream end ( 5 ) of the upstream duct section ( 3 ). 4. exhaust air collecting duct according to claim 1 with a polygonal, in particular rectangular cross-section, characterized in that the room side open expansion area ( 11 ) neigh disclosed limitation of each cross-sectional jump ( 10 ) of at least one U- or channel-shaped channel piece ( 17 ) gebil det which, from the upstream end ( 6 ) of the downstream channel section ( 4 ) overlaps the downstream end ( 5 ) of the upstream channel section ( 3 ) ( Fig. 3). 5. Exhaust air collecting duct according to claims 1 and 4, characterized in that the U- or channel-shaped profiled duct piece ( 17 ) by flange connections ( 14 , 18 ) to the upstream end ( 6 ) of the downstream duct section ( 4 ) can be connected . 6. exhaust air collecting duct ( 1 ) according to one of claims 1, 4 or 5 with in a cross-sectional direction - width or height - matching dimension of all duct sections, characterized in that the upstream end ( 6 ) of the downstream duct section ( 4 ) is provided over its entire circumference with a connecting flange ( 14 ), while the downstream end ( 5 ) of the upstream channel section ( 3 ) has a connecting flange ( 13 ) only on three circumferential sides that the U or channel-shaped profile Channel piece ( 17 ) at its downstream end also on three sides carries a connecting flange ( 18 ), and that the respective three-sided connecting flanges ( 13 and 18 ) on the upstream channel section ( 3 ) and on the U- or channel-shaped channel piece ( 17 ) complementary or with one another form a connecting flange ( 13/18 ) which with the four-sided connecting flange ( 14 ) at the upstream end ( 6 ) of the downstream channel section ( 4 ) can be connected in the cover position. 7. exhaust air collecting duct ( 1 ) according to claim 1 with a round flow cross-section of the duct sections ( 3 , 4 ), characterized by a central ( Fig. 12) or eccentric ( Fig. 13) arrangement of successive duct sections ( 3 , 4 ) . 8. exhaust air collecting duct ( 1 ) according to claims 1 to 7, characterized in that the inflow end ( 12 ) each room-side open expansion area ( 11 ) has a streamlined inlet edge, z. B. is provided with a rounded or angled or flanged widening ( 20 , 22 , 23 , 24 ) ( Fig. 14 to 17).