SE445485B - Roof spreader for supply of ventilation air - Google Patents

Abstract

The invention is a roof spreader (1) for ventilating locales. The spreader is equipped with an inlet section (4) with a perforated plate (5) that serves as a distribution body. The inlet section passes into a subsection (8) with downwardly aimed outlet orifices for ventilation air and laterally aimed slats (12) for so-called pilot air flows. In this invention, the subsection (8) has a closed central deflection sector (9) and extends laterally to an upwardly shielded compensation section (6). The named slats are situated above an edging strip (11) that surrounds the subsection outside of the compensation section.<IMAGE>

Description

10 15 20 25 30 35 8403368-7 2 An air diffuser according to the preamble of the main claim is known from FI-A 53 353 and comprises a housing or an equalizing part with an inlet socket in one end, side-facing openings and one with lower part provided with downward exit openings. On the lower part A cover plate is attached, which generates air vortices in the space above said lower part. The air diffuser further has an axial movable intermediate plate, which comprises an approximately central inlet nozzle located opening. The intermediate plate forms on the inlet side of the housing a second vortex chamber, which smooths it out of the disc 4 generated the turbulence and uneven air distribution in the the flea market. The cover plate is larger than the inlet nozzle and the opening gene in the diaphragm. The side openings extend all the way from lower part for intermediate plate.

This air diffuser has completely different flow properties and provides a completely different flow pattern than the air diffuser according to current invention. This previously known air diffuser provides gen a very unfavorable flow pattern, because the whole flow deflected by the center plate. Furthermore, the intermediate plate provides a reduced flow rate and vortex formation within the diffuser and a shorter throw length for the outflowing ventilation air. ten. Despite the reduced flow rate, air is allowed flow partly vertically downwards and partly horizontally to the sides, without these different currents interfering with each other, so that blemishes occur in any case. This diffuser thus provides an undesirable kad ventilation.

The flow pattern of the present invention is completely different, as can be seen from Fig. 1. It enters through the inlet the acting air flow is not affected by any intermediate disc or any other obstacle. Inside the equalization part the air flow is divided soft up in different substreams with different properties. The peripheral the greater part of the air flow is deflected as more and more lateral edge currents. These eventually exit through the ejection gap and then still has a relatively high speed, since des- said air currents in principle do not collide with different directional. the air currents or other obstacles. In this way a ho- rational air inflow under the roof with great impulse and throw length. 10 15 20 25 3U 35 8403368-7 3 The central part of the current strikes the deflection sector and above it forms a pyramid-like high pressure zone, along and by which the ventilation air is deflected to the sides as substantially parallel to the lower part directed transverse currents, which affects the intermediate air currents, which pass out through openings in the exit zone in the manner described below. The outgoing the air currents receive an increasing distance from the deflection sector increasing deflection up to the roof and deflecting 'after the exit from the air diffuser, due to the fact that they_ comes in the vicinity of emerging horizontal from said columns air currents with great impulse, which generate a suction behind them.

In this way, a desired large spread of ventilation air is obtained. ten sideways. In particular, strong downward air currents are avoided. from the air diffuser, which can produce drafts.

With an air diffuser according to the invention a lot is achieved especially, advantageous flow course. Such a flow- process is impossible to obtain with a device according to FI-A 53 353, which lacks several vital features, which is so essential to the present invention.

GB-A 939 738 discloses an air diffuser with a perforated outlet åon and a central deflection plate. The opposite gable on the equalizing part of the air diffuser approaches the wedge-shaped exit zone. and lateral ejection openings are completely missing. With this air diffusers provide a downward air flow, which is quite the opposite effect to, what is sought in the present ' case.

SE-A 334 991 shows an air diffuser, our inlet chamber has a narrow, horizontal, side-ended inlet. Exit zones consists of two perforated plates with an intermediate distribution chamber. At the edges of the exit zone are arranged obliquely they split directly from the inlet chamber. The columns are aligned obliquely downwards so as not to directly coat the roof.

This device has several disadvantages. It emits uneven lateral the air flows from the ventilation gaps, since the inlet chamber the air inlet is located on the side. It lacks deflection sec- un l0 15 ' 20 25 30 35 84 * 03368-7 4, tor-in-center and other flow-directing means, and therefore emits a sharp downward ventilation flow, which in contrast to the present invention is at least in the vicinity of the gaps, then the wedge-shaped taper of the distribution chamber appears strong flow inhibiting and limiting. The flow pattern thus differs entirely from the present invention, and also this device a number of essential characteristics that can lead to 'the now patent-pending construction.

Additional features and advantages of the invention will become apparent of the following description with reference to the accompanying drawings.

In detail represents these in partially schematic form: Fig. 1 shows a preferred embodiment of an air diffuser according to 7 the finding in a vertical diametrical section, Fig. 2 is a side view of a spreading image at an air spreader Fig. 1, Fig. 3 is a plan view of the scattering image according to Fig. 2, Fig. 4 is a side view of a preferred connection form for an air and spreaders according to the invention, I Fig. 6 is a top view of an air diffuser according to the preceding drawing :. 'figures, 1 _ _ Fig. 7 is a side view of an air diffuser according to the preceding drawing figures, and '' Fig. 8 is a bottom view of an air diffuser according to the foregoing drawing figures with alternative air outlet openings.

In the drawing figures, 1 denotes an air diffuser according to the invention in its entirety. The spreader is intended to be placed in an open 3 in a suspended ceiling 2, whereby it can abut with an external, preferably circumferential flange 7 towards the suspended ceiling, while the opening _gen is filled in by a wider leveling part 6, the middle part of which at the top merges into an inlet part 4, which houses a horizontal placed perforated sheet 5.

As can be seen from Fig. 6, the equalizing part 6 is preferably reclined. tangular in cross section, preferably square, while the inlet 4 is suitably circular for connection to a connection 18 to a duct system 19, optionally a connection 10 15 20 25 30 35 84033-68-7 5 i box 17 can be arranged between said duct system and said connection atom for bridging various pipes or duct dimensions and / or to achieve deflections or smiling angles.

At the bottom, the air diffuser is limited by a lower part 8 consisting of a central deflection sector 9, which may be rectangular or circular, preferably the office of the following equalizer and which at least in principle prevent the inflow part from air from flowing straight down in this area.

Therefore, the deflection actuator 9 is preferably completely closed, i.e. without openings. Around the deflection sector 9 is the lower part 8 provided with an air exit zone 10, which consists of either desperations and / or gaps Z1, as further described in Fig. 8. Outwardly, the exit zone 10 is preferably all around around limited by a screen strip ll, which leaves a relative flat ejection gap 12 between it and the flange 7, for example with a height of about 4 mm. In the horizontal direction, the gap 12 is preferred in principle unbroken. 1 context it may be the screen 11l protrudes a bit horizontally over the fixed advantageous, if the setting flange 7 partly to better hide the latter, partly in order to give the air exiting through the gap better control characteristics. Furthermore, the screen strip ll-be provided with a round immediately, facing the external ceiling 2 facing external phase 22. This phase can contribute to the exit of air through the openings 20 or 21 without vortex formation can get around this edge area in connection with a flow sequence described in more detail below.

As shown in Fig. 1, supply air flows through the perforated the plate S into the inlet part 4, whereby a first leveling occurs with respect to speed and flow rate and in some cases also occurring temperature variations. In this context, it is an advantage if the channel system 19 has a diameter dz, which is in such a relationship to the diameter of the connection atom 18 and / or the inlet portion 4, which is not larger than about 0.6.

Another condition may result in louder sound string and less favorable evacuation characteristics. 8403368-7 10 .15 25 30 35 6 The air entering through the perforated plate 5 in the inlet 4 the streams 23 are divided in the equalizing part 6 into different sub-streams with different properties. The central currents 24 strike the linking sector 9 to form above it a pyramid-like the high-pressure zones 25 along and through which the substreams kas-to the sides as transverse currents 26.

The external air currents 23 are deflected within the equalization part 6 as more and more aid-oriented edge currents 27, which eventually enter out of the equalizing part 6 through the ejection gap 12, whereby the efficiency is still relatively high, as these currents reach the column 12 in principle without colliding with different directions air currents. iDe between the center zone and the edge zone in the inlet part entering the air currents 23 deflect in the equalizing part 6 to the sides of to exit the openings in exit zone 10. Thanks to the cen- the air currents 24 and the pyramid-like the high pressure zone 25 and transverse currents 26 emanating therefrom Zoo however, said through the exit zone 10 the air diffuser is left air currents 28 from being unaffected and thus with high speed leave the spreader} Through the stop against deflection sector 9, the central air streams 24 do not lose whole 'its momentum, so that the transverse currents 26 still have sufficient speed to cause a favorable collision with the intermediate air currents 28. In practice, the transverse the currents 26 in the immediate vicinity of the deflection sector 9 to have greater momentum than the air currents 28, which means that the air exit from the openings immediately around the deflection section. tower will be limited. Further outwards, of course, transverse currents 26 momentum, not least due to the fact that a growing part of the currents follow out through the openings 20 and Zl, respectively, so that the air exit from zone lü becomes increasingly stronger closer to the gap 12, which is a sought-after effect, as these air flows due to the deflection sector 9, the high pressure zone 25 * and the leveling part 6 becomes increasingly obliquely outwards, whereby an ever-improving connection and adherence to it through 1D 15 20 25 30 '35 40 8403368-7 a a 7 The 12 exiting air with relatively high momentum is obtained. On thus, according to Fig. 2, main flow directions 13 with core zones 14, to which the exiting zone 10 leaving the air is connected appear as attracted supply air currents 15. Such a In addition, it is assisted by a local circulation they, the backflowing air, which flows upwards below the air diffuser according to the invention to then strike the air streams 15 and partially join them and join to said core zones 14 in the form of substreams 16. In conjunction goat may emphasize the importance of the equalizing part 6, which shields upwards a large part of the exit zone 10, so that in it so the area forcibly shielded incoming air currents become skewed and this becomes more and more the closer you get to tionaspalterna 12.

These advantageous features are also shown in Figures 5-8. Sole- is the ratio between the inlet part 4 or the connection the diameter dl of the socket 18 and an edge length a of the exit zone 10 preferably approximately dlza = 0.6. The equalization part 6 height b is preferably greater than 25 mm. Furthermore, the relationship between the edge length -c of the deflection sector 9 and the inlet parts 4 or the diameter of the connection socket 18 dl approximately czdl = U, 65. The distance between the upper plane of the leveling part 6 and the perforation the ring plate 5 is in a preferred embodiment about 60 mm, wherein the diameter of the perforation holes is about 5 mm in a perforation pro- 33. Finally, in the exit zone, 10 perforation percentages are the number is preferably 46, while in the case of lamellae preferably there is an opening area of 36%. You have arrived up to these values when constructing a test facility, where, among other things, smoke tests have proven the accuracy and significance of i previously described and shown in the accompanying drawings. lead example.

Of course, described and shown embodiments are only to be considered treaties as examples, which can be modified and supplemented within the scope of the inventive concept and the following tent requirements. Thus, it is of course possible to on one or more sides completely or partially clog the ejection gap 12, which easy, simple and cheap can be done for example through a in fitting lengths of rubber strip provided 29. In this way, one can sooner s4o3zas-1 We 10 8 or later adapt an air diffuser according to the invention to different needs and wishes. Simultaneously or prinoipially one can likewise shielding parts of the exit zone 10, for example by insertion of cover plates 30 in the leveling part. This can possibly shall through a combination of cover plate for the exit zone and strip for the ejection gap. Such cover plates do not necessarily have to be closed, but these may be provided with less penetration openings, for example in the form of perforations. It should also be mentioned nas, that an air diffuser intended in principle for supply air according to the invention can be used periodically or in principle for supply of exhaust air.

Claims (10)

10 15 20 25 30; ~ ss 8403368-7 9 'P A 1 E N 1 K R A v A ceiling diffuser for supplying ventilation air, comprising a central, vertical inlet part (4) downwards connecting to a laterally extended, upwardly shielded leveling part (6), which has lateral openings (12), and which is delimited downwards by a downwardly directed exit openings (20 and 21, respectively) provided with directional exit openings (20 and 21, respectively), the lower part being provided with a central deflection sector (9), around which said exit openings (20 and 21) forming an exit zone (10), respectively, are arranged. etc. is that said lateral openings (l2) are formed as flat, horizontal ejection gaps formed by and enclosed between a flattening flange (7) to the leveling part (6) and a lowering strip (ll) located below it, which forms a circumferential frame of the lower part (8) and projects over said fastening flange. Roof spreader according to Claim 1, characterized in that the deflection sector (9) follows the contour of the leveling part, ie is rectangular at the rectangular leveling part and circular at the circular leveling part, and that the relationship between the deflection sector's edge length (diameter) or diameter the diameter (dl) of the inlet part (4) is approximately p = al = 0.65. Roof spreader according to Claim 1 or 2, characterized in that the perforated plate (5) is arranged in the inlet part (4) with the lower part (8), the diameter of the perforation holes preferably amounting to about 5 mm and the perforation percentage to about 33. Roof spreader according to claim 1, 2 or 3, characterized in that a connection socket (18), which in turn is connected to a connection box (17), or that the inlet part (4) is connected directly closed to such an anal outlet box for connection to a keel inlet part (4) is connected nelsystem (19), each charge diameter (dz) relates to the inlet parts (4) and the diameter (dl) of the connection toilet (18) approximately as dzzdl = The diameter (5) of the inlet (4) is approximately 60 mm 8463: 68-1 to 10. Roof spreader according to at least one of Claims 1 to 4, characterized in that the deflection actuator (9) has a very fine perforation, which in principle prevents air flowing in from the compensating part from flowing further straight downwards within this area. 'I Roof spreader according to at least one of Claims 1 to 5, characterized in that the openings of the exit zone (10) are formed by perforations (20) and / or gaps (21), and that the perforation percentage is around # 6, while in the case of columns, there is preferably an opening area of 36%. Roof spreader according to at least one of Claims 1 to 6, 7, characterized in that the ejection gap (12) between the screen strip (II) and the fixing flange (7) has a height of approx. Å mm. 0 Roof diffuser according to at least one of Claims 1 to 7, characterized in that the screen strip (II) is provided with a circumferential outer phase (22) directed towards a fastening surface (2) of the air diffuser. i I 7 Ceiling spreader according to at least one of Claims 1B, characterized in that 'parts of the ejection gap (12) are clogeable, preferably by means of one or more insertable strips (29) and / or that parts of the tree zone (10) are shieldable, preferably by cover plates (30) which can be inserted into the leveling part (6), which are optionally combined with said sealing strips (29). Roof spreader according to at least one of claims 1 to 8, a height (b) of which is about or greater than 25 mm, and / or a distance between the upper plane of the leveling part (6) and the perforating plate.