DK165854B

DK165854B - AIR DISTRIBUTOR

Info

Publication number: DK165854B
Application number: DK624187A
Authority: DK
Inventors: Roy Holmberg; Stig Wikstroem
Original assignee: Flaekt Ab
Priority date: 1986-11-28
Filing date: 1987-11-27
Publication date: 1993-01-25
Also published as: FI84097C; SE8605147L; EP0268993A2; EP0268993A3; DK624187D0; DK165854C; NO874917L; FI84097B; NO164125B; NO874917D0; FI875242A0; SE457563B; NO164125C; FI875242A; DK624187A; SE8605147D0

Description

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Opfindelsen angår en luftfordeler, og særligt en luftfordeler for loftmontage af den art, der er angivet i indledningen til patentkrav 1.· 5 Ved luftfordelere af denne art ligger fordelerringen sædvanligvis an mod loftet. Dens yderkant er afbøjet med afrunding mod den aktuelle bygningsoverflade. Derudover er fordelerringen sædvanligvis formet konveks og derved med sit kantområde rettet mod loftet. Alternativt er fordeler-10 skiven udformet parallelt med loftet. På grund af dette vil den udstrømmende luft være rettet parallelt med henholdsvis tilbage mod loftet. På denne måde opstår den såkaldte Koanda-effekt, dvs. at luften, der strømmer langs loftet på grund af undertryksdannelser afbøjes mod loftet 15 og følger dette, idet der først sker en kollision og derefter hvirveldannelser, hvilket bremser lufthastigheden og dermed reducerer strømningsstrækningen eller fordelingsområdet for luftfordeleren.This invention relates to an air distributor, and in particular to an air distributor for ceiling mounting of the kind set forth in the preamble of claim 1. · 5 In the case of air distributors of this kind, the distributor ring usually abuts the ceiling. Its outer edge is deflected by rounding to the actual building surface. In addition, the distributor ring is usually shaped convex and thereby with its edge area directed towards the ceiling. Alternatively, the distributor disk is formed parallel to the ceiling. Because of this, the outflow air will be directed parallel to the ceiling respectively. In this way, the so-called Koanda effect, ie. the air flowing along the ceiling due to suppression is deflected against the ceiling 15 and follows, first a collision and then swirling, which slows the air velocity and thus reduces the flow distance or distribution area of the air distributor.

En anden ulempe ved kendte luftfordelere består i, at den 20 indstrømmende ventilationsluft næsten altid forårsager forurening af loftet eller tilsvarende overflader i nedslagsområdet. På grund af dette er man ofte tvunget til at anbringe en særlig beskyttelsesring af et let vaskbart materiale, der dækker loftet eller vægoverfladen rundt om 25 luftfordeleren.Another disadvantage of known air distributors is that the 20 inflowing ventilation air almost always causes pollution of the ceiling or similar surfaces in the impact area. Because of this, it is often forced to place a special protective ring of a lightly washable material covering the ceiling or wall surface around the air distributor.

En yderligere ulempe ved kendte luftfordelere består i, at friskluftledningen langs den aktuelle bygningsoverflade giver en utilstrækkelig kontakt med luften i rummet, således at der sker en utilfredsstillende blanding mellem 30 den tilstedeværende og den tilførte luft. Dette forstærkes på grund af den korte strømningsstrækning. For at opnå en tilfredsstillende blandende gennemluftning af alle områder i et rum, må man derfor forøge den tilførte ventilationsluftmængde ved at forøge lufthastigheden eller antalletA further disadvantage of known air distributors is that the fresh air line along the current building surface provides insufficient contact with the air in the room, so that an unsatisfactory mixing occurs between the present and the supplied air. This is amplified due to the short flow distance. Therefore, to obtain a satisfactory mixing aeration of all areas of a room, one must increase the amount of ventilation air supplied by increasing the air velocity or number.

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2 af luftfordelere. Dette betyder naturligvis øgede omkostninger. Forøget lufthastighed kan udover at give forøget træk også skabe forstyrrende støj i luftfordeleren.2 of air distributors. This, of course, means increased costs. In addition to providing increased features, increased air velocity can also create disruptive noise in the air distributor.

5 Forøget tilførsel af varm luft fører desuden til forøgede varmeomkostninger. .....5 Increased supply of hot air also leads to increased heating costs. .....

En anden ulempe ved kendte luftfordelere, der giver en ventilationsluft, der følger overfladerne på den aktuelle bygningsdel, ligger i, at det er vanskeligt eller umuligt 10 at forandre fordelingsretningen på den indstrømmende luft inden for strømningsplanet, henholdsvis ovenover eller nedenunder. Ved f.eks. loftfordelere kan man afhængigt af lofthøjden eller af andre grunde f.eks. ønske at opnå en mere nedadrettet ventilationsstrømning. Det er imidlertid 15 meget vanskeligt at opnå en sådan nedadrettet strømning, idet den indstrømmende ventilationsluft er afbøjet til, på grund af Koanda-effekten, at følge loftet. En mere eller mindre lige nedadrettet ventilationsluftstrømning vil på den anden side skabe kraftig træk med alt for høj luft-20 hastighed.Another disadvantage of known air distributors which provide a ventilation air which follows the surfaces of the current building part is that it is difficult or impossible to change the distribution direction of the inflowing air within the flow plane, respectively above or below. For example, ceiling distributors can be depending on the ceiling height or for other reasons e.g. desire to achieve a more downward ventilation flow. However, such downward flow is very difficult to achieve as the inflowing ventilation air is deflected to follow the ceiling due to the Koanda effect. A more or less straight downward ventilation air flow, on the other hand, will create powerful drag with too high air velocity.

Opfindelsen har til formål at angive en luftfordeler, der undgår forurening af placeringsområdet. Et andet formål med opfindelsen er at lade ventilationsluften strømme ind med en større strømningsstrækning eller kastelængde i 25 forhold til luftmængden, samtidig med at der opnås en tilfredsstillende blanding med luften i hele rumområdet, med lav luftomsætning og lavt støjniveau. Et yderligere formål er at angive en luftfordeler, der selv ved store afstande mellem flere luftfordelere, skaber god udluftning 30 og desuden kræver lav luftomsætning og dermed lave varmeomkostninger. Desuden bør luftfordeleren være enkelt opbygget, have lave fabrikationsomkostninger og være let at montere samt at indstille og omstille.The invention aims to provide an air distributor which avoids contamination of the location area. Another object of the invention is to allow the ventilation air to flow in with a greater flow distance or throw length relative to the air volume, while at the same time achieving a satisfactory mixture with the air throughout the room area, with low air circulation and low noise level. A further object is to provide an air distributor which, even at large distances between several air distributors, creates good ventilation 30 and in addition requires low air circulation and thus low heating costs. In addition, the air distributor should be simple in design, have low fabrication costs and be easy to install as well as adjust and adjust.

Dette formål opnås ifølge opfindelsen ved en luftfordeler, 35 som angivet i den kendetegnende del af patentkrav 1.This object is achieved according to the invention by an air distributor, as defined in the characterizing part of claim 1.

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33

Ved en luftfordeler ifølge opfindelsen suger den indstrømmende primærluft med sig en strøm af omgivelseseller sekundærluft i området mellem den indstrømmende luft 5 og den aktuelle bygningsdel, f.eks. loftet eller en væg.In an air distributor according to the invention, the inflowing primary air sucks with it a flow of ambient or secondary air in the area between the inflowing air 5 and the actual building part, e.g. the ceiling or a wall.

På grund af at primærluften ikke får nogen tidlig direkte kontakt med den aktuelle bygningsdel, hvis en sådan kontakt overhovedet sker, sker der bare en lille opbremsning, således at strømningsområdet udvides. Derud-10 over fører denne indsugning af den omgivende luft til en forbedret blanding af ventilationsluften med den omgivende luft, idet en sådan blanding nu kan ske på begge sider af primærluftstrømmen. Den omgivende luft, der suges ind af den udstrømmende ventilationsluft, skærmer denne imod 15 bygningsdelen og hindrer dermed effektivt, at der sker en forurening ved indstrømningen af ventilationsluften.Due to the fact that the primary air does not get any direct direct contact with the actual building part, if such contact is made at all, only a slight slowing occurs, so that the flow area is expanded. In addition, this suction of the ambient air leads to an improved mixing of the ventilation air with the ambient air, such a mixture now being able to occur on both sides of the primary air flow. The ambient air sucked in by the outflowing ventilation air shields it against the building part and thus effectively prevents contamination by the flow of the ventilation air.

Ved en foretrukken udførelsesform ifølge opfindelsen har fordelerskiven konkav yderform og konveks inderform. Ved brug af fordelerskiver med forskellige krumningsradier er 20 det muligt, på enkel måde at ændre retningen af den indstrømmende ventilationsluft med hensyn til vinkelen til luftfordelerens centralakse. Selv om de forskellige dele af opfindelsen er kendt i andre sammenhæng, er det første gang, at den samlede problemstilling angribes under ét og 25 giver en særlig fordelagtig ny kombinationsløsning. Ved indsugning af den omgivende luft mellem f.eks. loftet og friskluftstrømmen, opnås en forsinkelse/forlængelse af Koanda-effekten, idet den omgivende luft danner en buffer mellem loftet og strømmen. Den omgivende luft bevæger sig 30 desuden med betydeligt lavere hastighed end den friske luft, men bevæger sig i samme retning, således at turbulens under loftet .og derved opbremsning af den friske luft forhindres i stor udstrækning. Hastighedsforskellen er imidlertid tilstrækkelig til at suge den friske luft 35 over en stor afstand fra fordeleren, f.eks. i retning mod loftet, på grund af manglende undertryksudfyldning af denIn a preferred embodiment of the invention, the distributor disk has a concave outer shape and a convex inner shape. By using distributor discs with different radii of curvature, it is possible to simply change the direction of the inflowing ventilation air with respect to the angle of the central axis of the air distributor. Although the various parts of the invention are known in other contexts, this is the first time that the overall problem is being attacked together and 25 provides a particularly advantageous new combination solution. By sucking in the ambient air between e.g. the ceiling and the fresh air flow, a delay / extension of the Koanda effect is obtained as the ambient air forms a buffer between the ceiling and the flow. In addition, the ambient air moves at a significantly lower velocity than the fresh air, but moves in the same direction so that turbulence under the ceiling and thereby braking of the fresh air is greatly prevented. However, the velocity difference is sufficient to suck the fresh air 35 over a large distance from the distributor, e.g. towards the ceiling, due to the lack of suppression of it

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4 omgivende luft, således at omgivningsluftmomentet virker som en pude, der tømmes langsomt, og mod hvilken den friske luft glider og blander sig med den omgivende luft.4 ambient air, so that the ambient air moment acts as a slowly discharged pad against which the fresh air slides and mixes with the ambient air.

5 Den omgivende luft, der strømmer ind under fordelerskiven, bliver på grund af trækket, der er angivet sidst i patentkrav 1, bøjet svagt nedefter således, at der på den nedre side af friskluftstrømmen opstår et undertryk, selv om dette er meget svagt, således at friskluftstrømmen 10 trækkes lidt ned mod den nedre omgivelsesluftstrøm, hvilket fører til, at friskluftstrømmen får en noget større rækkevidde. Opfindelsen giver på denne måde en homogen totalløsning med et avanceret vekselspil mellem forskellige enkeltdele. Aggregatet ifølge opfindelsen 15 udgør derfor et værdifuldt bidrag til det tekniske fremskridt inden for "komfortventilation".The ambient air flowing underneath the distributor disk is slightly bent downwardly due to the draft stated in claim 1, such that a low pressure, although very weak, is formed on the lower side of the fresh air stream, thus that the fresh air stream 10 is drawn down slightly towards the lower ambient air stream, which causes the fresh air stream to have a somewhat wider range. In this way, the invention provides a homogeneous total solution with an advanced interplay between different individual parts. The assembly according to the invention 15 therefore makes a valuable contribution to the technical progress in "comfort ventilation".

Ifølge opfindelsen kan luftfordeleren være udført som vist på tegningen, hvor fig. 1 viser et sidebillede af en luftfordeler ifølge 20 opfindelsen, fig. 2 viser et planbillede af luftfordeleren i fig. 1, set fra lufttilføringssiden, fig. 3 viser et aksialt snit gennem luftfordeleren i fig. 1, 25 fig. 4 viser et planbillede af luftfordelerens fordelerskive, set fra lufttilføringssiden, og fig. 5 viser et skematisk sidebillede af et aggregat ifølge opfindelsen med retningspile for den herskende luftstrøm.According to the invention, the air distributor may be designed as shown in the drawing, in which fig. 1 is a side view of an air distributor according to the invention; FIG. 2 is a plan view of the air distributor of FIG. 1, seen from the air supply side; FIG. 3 shows an axial section through the air distributor of FIG. 1, FIG. 4 is a plan view of the distributor disc of the air distributor, as seen from the air supply side, and FIG. 5 shows a schematic side view of an assembly according to the invention with directional arrows for the prevailing air flow.

30 Fig. 1-3 viser forskellige billeder af en luftfordeler 10 i overensstemmelse med opfindelsen, der består af en hoveddel 12 med en fordelerring 14, en studs 15 og en fastgøringsring 16 samt en fordelerskive 18 med en lede-og dækplade 20, i det følgende kaldt skærmen 20. Studsen 35 15 har to indadrettede aksialt gående vulster 22, derFIG. 1-3 show various views of an air distributor 10 in accordance with the invention, consisting of a body part 12 with a distributor ring 14, a stud 15 and a fastening ring 16, and a distributor disc 18 with a guide and cover plate 20, hereinafter called the screen 20. The stud 35 15 has two inwardly extending axially extending beads 22 which

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5 samarbejder med aksiale noter 24, der er indpressede i skærmen til fordelerskiven. Mellem vulsterne er der anbragt en aksial slids 26 for en fastgøringsskrue 28 til 5 fordelerskiven. Skruen 28 er indsat i et gevindhul 30 i skærmen 20. På denne måde er fordelerskiven 18 aksialt bevægelig, men ikke roterbar i forhold til tilkoblingsstudsen 12.5 cooperates with axial grooves 24, which are pressed into the screen of the distributor disk. Between the beads an axial slot 26 is provided for a fastening screw 28 to 5 of the distributor disk. The screw 28 is inserted into a threaded hole 30 in the screen 20. In this way, the distributor disc 18 is axially movable, but not rotatable relative to the connecting pin 12.

Tilkoblingsstudsen 12 har på sin indløbsside indadrettet 10 ansats 32, som fastgøringsringen 16 ligger an mod. Fastgøringsringen 16 består af en ring 34, hvorfra der udrager en radial flange 36 samt nogle indadbøjede fastgøringsfremspring 38. Flangen 36 bærer en pakning 40, f.eks. af skumplast, til tætning af enden i forhold til et 15 ventilationsrør 42, der skal tilkobles og/eller en overflade på den aktuelle bygningsdel, f.eks. et loft 44. Fremspringene 35 har hver to huller 46 til anbringelse af enderne på fjederbøjler 48. Disse bruges for at fastgøre luftfordeleren i en udløbsindsats 50, der er anbragt i et 20 ventilationsrør 42. Udløbsindsatsen har en tætningsmanchet 52, en flange 54, der ligger an mod loftet og en not 56, der ligger op mod flangen. Luftfordeleren ifølge opfindelsen monteres ved at føre bøjlerne 48 fra hinanden, og ved at indføre disse i noten 56 og trykke luftfordeleren mod 25 loftet. Fjederbøjlen 48 passerer da en dødstilling og presser luftfordeleren under fjederkraft mod loftet. Luftfordeleren kan let fjernes igen ved at trække den nedefter, idet fjederbøjlen da igen passerer dødpunkt-stillingen. Luftfordeleren kan let drejes i sit ophæng og 30 indstilles i den ønskede fordelerretning, på grund af fjederbelastningen i den ringformede not 56 på udløbsindsatsen 50.The coupling spigot 12 has on its inlet side 10 an inwardly directed stop 32 against which the attachment ring 16 abuts. The attachment ring 16 consists of a ring 34 from which extends a radial flange 36 as well as some inwardly bent attachment projections 38. The flange 36 carries a gasket 40, e.g. of foamed plastic, for sealing the end relative to a vent tube 42 to be connected and / or a surface of the actual building portion, e.g. a ceiling 44. The projections 35 each have two holes 46 for affixing the ends to spring shackles 48. These are used to secure the air distributor to an outlet insert 50 disposed in a vent tube 42. The outlet insert has a sealing sleeve 52, a flange 54 which abuts the ceiling and a groove 56, which faces the flange. The air distributor according to the invention is mounted by moving the shackles 48 apart and by inserting them into the groove 56 and pushing the air distributor against the ceiling. The spring hanger 48 then passes a dead position and presses the air distributor under spring force against the ceiling. The air distributor can be easily removed again by pulling it down, the spring brace then again passing the dead point position. The air distributor can be easily rotated in its suspension and set in the desired distribution direction, due to the spring load in the annular groove 56 on the outlet insert 50.

Fordelerringen 14 består af en blød afrundet overgangsdel 58 mellem studsene 15 og et ydre, fortrinsvis lige eller i 35 det mindste tilnærmelsesvis lige område, f.eks. en koniskThe distributor ring 14 consists of a soft rounded transition part 58 between the studs 15 and an outer, preferably straight or at least approximately equal region, e.g. a taper

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6 overflade 60. Dette lige område kan imidlertid også bestå af en pyramideflade eller en anden lige overflade, hvis luftfordeleren ikke er rotationssymmetrisk.6 surface 60. However, this even area may also consist of a pyramid surface or other straight surface if the air distributor is not rotationally symmetrical.

5 Fordelerskiven 18 med den tilhørende skærm 20 ses bedst i fig. 4. Skærmen er dannet cylindrisk for at kunne ligge an mod indersiden af tilkoblingsstudsen, og afskærme en del af fordelerens udløbsspalte. Skærmen har en flange 62, der ligger an mod fordelerskiven 18 og er fastgjort ved hjælp 10 af punktsvejsning. Skærmen har derudover skrå sidekanter 66 samt i udløbsspalten 68 afbøjede, afskærmende flanger 70. Op mod disse har fordelerskiven tætningspuder 72, fortrinsvis af skumplast. Puderne kan sammenpresses og udfylder udløbsspalten 68 mellem fordelerskiven og forde-15 lérringen. Herved forhindres, at der lækker luft ud i området ved de skærmende flanger 70. Det har ved forsøg vist sig, at en sådan lækkende luft giver forstyrrende støj, og man har ved hjælp af disse puder kunnet sænke støjniveauet med fire decibel.5 The distributor disc 18 with the associated shield 20 is best seen in FIG. 4. The shield is formed cylindrical to abut the inside of the connector, shielding part of the distributor outlet slot. The shield has a flange 62 abutting the distributor disk 18 and is secured by means of spot welding. In addition, the screen has slanted side edges 66 and deflected flanges 70 deflected in the outlet slot 68. Up against these, the distributor disk has sealing pads 72, preferably of foam plastic. The pads can be compressed and fill the outlet slot 68 between the distributor disk and the distributor ring. This prevents the leakage of air into the area by the shielding flanges 70. It has been shown in experiments that such leaking air causes disturbing noise and by means of these pads it has been possible to lower the noise level by four decibels.

20 Fordelerskiven 18 er krum, indvendig konveks og udvendig konkav, og begrænser med sin omkredskant sammen med de tætte områder 60 på fordelerringen 14 en udefter afsmallende udløbsspalte 68. Omkredsområdet 74 på skiven danner sammen med det lige område 60 på fordelerringen en udad-25 rettet spalte 68 rettet væk fra loftet. Fordelerskiven 18 har en mindre yderdiameter end fordelerringen 14, hvilket bidrager til at rette luftstrømmen 78 nedefter.The distributor disc 18 is curved, internally convex and externally concave, and with its circumferential edge, together with the dense regions 60 of the distributor ring 14, limits an outwardly tapered outlet slot 68. The circumferential region 74 of the disc together with the straight region 60 of the distributor ring forms an outwardly directed slot 68 straightened away from the ceiling. The distributor disc 18 has a smaller outer diameter than the distributor ring 14, which helps to direct the airflow 78 downwards.

Det er væsentligt for opfindelsen, at fordelerringens yderområde 60 er i det mindste næsten lige, og ikke stærkt 30 afrundet eller f.eks. tilbagebøjet i forhold til den aktuelle bygningsdel. Dette ville nemlig medføre en skadelig og tidlig Koanda-effekt og bøje luftstrømmen for tidligt mod bygningsdelen. I modsætning til dette er det et formål med opfindelsen at lade ventilationsluften strømmeIt is essential for the invention that the outer region 60 of the manifold ring is at least nearly equal, and not strongly rounded or e.g. bent to the actual building part. This would cause a detrimental and early Koanda effect and prematurely bend the air flow towards the building. In contrast, it is an object of the invention to allow the ventilation air to flow

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7 med en vis vinkel bort fra bygningsdelen, således at man undgår loftforurening ved at forhindre en tidlig direkte kontakt mellem den indstrømmende ventilationsluft med høj 5 hastighed, hvilket medfører, at tunge forureningspartikler kastes ud af luftstrømmen og mod loftet. Det er derfor væsentligt for opfindelsen, at fordelerringen har den form, som der er angivet ovenfor.7 with a certain angle away from the building part, so as to avoid ceiling pollution by preventing an early direct contact between the high velocity inflowing ventilation air, which causes heavy pollution particles to be thrown out of the air stream and towards the ceiling. It is therefore essential for the invention that the manifold ring has the shape set forth above.

Strømningsforholdene rundt om luftfordeleren ifølge opfin-10 delsen fremgår af fig. 5. Den udstrømmende ventilationsluft bevæger sig skråt bort fra loftet 44. Herved skabes der et undertryk på begge sider af udløbsspalten og den udstrømmende luft, hvilket er vist ved minus-tegn, hvor dette undertryk virker således, at der mellem ventila-15 tionsstrømmen 78 og loftet 44 indsuges en sekundær luftstrøm 80, der består af den omgivende luft. Dette afskærmer den indstrømmende luft 78 fra en tidlig direkte kontakt med loftet 44. Den sekundære luftstrøm 80 har naturligvis en hastighedsgradient, der aftager mod loftet.The flow conditions around the air distributor according to the invention are shown in FIG. 5. The outflow ventilation air moves obliquely away from the ceiling 44. This creates a negative pressure on both sides of the outlet slot and the outflow air, which is shown by minus signs, where this negative pressure acts so that between the ventilation flow 78 and the ceiling 44 is sucked in a secondary air stream 80 consisting of the surrounding air. This shields the inflowing air 78 from an early direct contact with the ceiling 44. The secondary airflow 80, of course, has a velocity gradient which decreases toward the ceiling.

20 Idet den primære luftstrøm 78 ikke kommer tidligt i direkte kontakt med loftet, afbremses den ikke stærkt af dette, og lufthastigheden og dermed strømningsstrækningen eller udblæsningslængden er derved større.20 As the primary airflow 78 does not come into direct contact with the ceiling early, it is not greatly slowed by this, and thus the air velocity and thus the flow distance or the exhaust length are greater.

Ved indsugning af sekundærluft 80 forskydes fordelings-25 området for den indstrømmende primærluft nedefter, som det er antydet med grænselinierne 81. Ventilationsluften samler sig derved ikke hovedsagelig under loftet som tidligere.Upon suction of secondary air 80, the distribution area of the inflowing primary air is shifted downward, as indicated by the boundary lines 81. The ventilation air does not thereby collect mainly under the ceiling as before.

På den side af ventilationsluftstrømmen 78, der vender 30 bort fra loftet, danner der sig også en nedre sekundærluftstrøm 84. Denne består af luft, der suges ind fra rummet nedenunder og afbøjes langs den i det væsentlige konkave overflade på fordelerskiven 18. Den konkave form på fordelerskiven begunstiger herved en indsugning afOn the side of the ventilation air stream 78, which faces away from the ceiling 30, a lower secondary air flow 84 is also formed. This consists of air being sucked in from the space below and deflected along the substantially concave surface of the distributor disk 18. The concave shape on the distributor disk thereby favors an intake of

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8 sekundærluft 84 fra de nedre regioner til det omgivende rum. Der sker derfor ikke kun en indsugning af loftnær omgivningsluft. Den konkave form sikrer desuden en blød 5 overføring af sekundærluftstrømmen 84 til ventilationsstrømmen 78, der på grund af et svagt undertryk påvirkes af nedadrettede, styrende sidekræfter, som det er antydet med pilen 86. Dette bidrager også til at give den udstrømmende ventilationsluft 78 en retning bort fra det derover 10 liggende loft 44. Den konvekse udførelsesform af fordelerskiven på dennes inderside er fordelagtig til at opnå en blød overføring af strømmen i udløbsspalten, i forhold til en plan eller konkav inderside, som ventilationsluften ellers ville støde mod.8 secondary air 84 from the lower regions to the surrounding space. Therefore, there is not only an intake of ceiling near ambient air. In addition, the concave shape ensures a soft transfer of secondary air flow 84 to the ventilation flow 78 which, due to a slight negative pressure, is influenced by downward controlling side forces, as indicated by the arrow 86. This also contributes to giving the flowing ventilation air 78 a direction. away from the overlying ceiling 44. The convex embodiment of the distributor disk on the inside thereof is advantageous to achieve a smooth transfer of the flow in the outlet slot, relative to a planar or concave inside which the ventilation air would otherwise encounter.

15 Det er muligt at påvirke fordelingsbilledet, hvis fordelerskiven 18 gives forskellige krumningsradier. Jo krummere fordelingsskiven er desto stærkere afbøjes ventilationsluftstrømmen nedefter. Denne ændring i strømningsbilledet kan inden for visse grænser opnås uden form-20 ændringer på fordelerringen. På denne måde opnås en økonomisk forandringsmulighed på fordelerbilledet for luftfordeleren, idet det kun er nødvendigt at forandre den forholdsvis ukomplicerede fordelerskive 18, f.eks. skifte denne.15 It is possible to affect the distribution image if the distribution disc 18 is given different radii of curvature. The narrower the distribution disc is, the stronger the deflection air flow is deflected downward. This change in the flow picture can be achieved within certain limits without shape changes on the distributor ring. In this way, an economic change opportunity is obtained in the distributor image for the air distributor, since it is only necessary to change the relatively uncomplicated distributor disk 18, e.g. change this one.

25 En vigtig forudsætning for indsugning af en sekundær luftstrøm 80 mellem den indstrømmende ventilationsluft og loftet er, at fordelerringen 18 befinder sig i væsentlig afstand fra loftet, og at studsen 15 danner en hals med’ mindre diameter end yderdiameteren på fordelerringen. På 30 denne måde kan den yderside 88 på fordelerringen, der vender bort fra spalten 68, danne en ledeoverflade for den nævnte sekundære luftstrøm 80, således at denne kan slutte sig til den indstrømmende ventilationsluft på hovedsagelig laminær måde og uden nogen kraftig retningsforandring.An important prerequisite for the suction of a secondary airflow 80 between the inflowing ventilation air and the ceiling is that the distributor ring 18 is at a substantial distance from the ceiling and that the plug 15 forms a neck with a smaller diameter than the outer diameter of the distributor ring. In this way, the outer surface 88 of the distributor ring facing away from the slot 68 can form a guide surface for said secondary airflow 80 so that it can join the inflowing ventilation air in a substantially laminar manner and without any significant change of direction.

35 Noget tilsvarende er ikke muligt ved hjælp af en distancering med samme dimension som diameteren på fordelerringen.35 Something similar is not possible by means of a spacer with the same dimension as the diameter of the distributor ring.

DK 165854 BDK 165854 B

99

Der ville i dette tilfælde opstå kraftige retningsforandringer og turbulens, således at dannelsen af en sekundærluftstrøm 80 påvirkes« En fordelagtig studslængde 5 er ofte 0,5-2 gange studsdiameteren.In this case, severe directional changes and turbulence would occur, so that the formation of a secondary airflow 80 is affected. An advantageous stud length 5 is often 0.5-2 times the bounce diameter.

Skærmen dækker almindeligvis mindst den halve omkreds af udløbsspalten 68. Med en mindre afdækning er det vanskeligt at suge sekundærluft ind langs hele udløbsspalten, særligt ved lave studslængder. I en foretrukken udførel-10 sesform er mere end den halve udløbsspalte dækket.The screen generally covers at least half the circumference of the outlet slot 68. With a smaller cover, it is difficult to suck in secondary air along the entire outlet slot, especially at low stud lengths. In a preferred embodiment, more than half the outlet gap is covered.

Det ydre, i det mindste hovedsagelig det lige område 60 på fordelerringen 14, danner en vinkel med studsen 15. Størrelsen af vinkelen kan være 90-150°. Ifølge det, der ovenfor er angivet, skal ventilationsluftstrømmen være rettet 15 bort fra den aktuelle bygningsdel, og vinkelen må derfor være mere end 90°, foretrukkent 120°.The exterior, at least substantially the straight region 60 of the distributor ring 14, forms an angle with the plug 15. The size of the angle may be 90-150 °. According to the above, the ventilation air flow must be directed away from the actual building part and the angle must therefore be more than 90 °, preferably 120 °.

Dannelsen af en sekundær luftstrøm 80 mellem den indkommende ventilationsstrøm 78 og loftet fører til en bedre blanding mellem den indstrømmende ventilationsluft og den 20 omgivende luft, idet luftblandingen kan ske på begge sider af udløbsspalten 68. På denne måde reduceres ventilationsbehovet, idet den tilførte ventilationsluft bedre fordeles ind i de områder af rummet, der er mindst ventileret.The formation of a secondary air stream 80 between the incoming ventilation stream 78 and the ceiling leads to a better mixing between the inflowing ventilation air and the surrounding air, the air mixing being able to occur on both sides of the outlet slot 68. In this way, the ventilation requirement is reduced as the supply air supply is better. distributed into areas of the least ventilated space.

Fastgøring af fordelerskiven 18 med en skrue eller lignen-25 de 28, og en styring i form af vulster 22 og noter 23, danner en meget stærk og nøjagtig fastgørelse. På denne måde opnås en nøjagtig kontrol med formen på udløbsspalten 68. Fastgørelsesskruen eller lignende 28 og den dermed samarbejdende gevinddel på skærmen 20 kan have ønsket 30 udførelsesform. En særligt enkel og god løsning er brugen af en selvskærende skrue 28. Det kan også være fordelagtigt at benytte en skærm, der kan udvides eller forkortes i omkredsretningen, hvilket kan udføres med enkle og i sig selv kendte midler.Attachment of the distributor disk 18 with a screw or the like 28, and a guide in the form of beads 22 and grooves 23, form a very strong and accurate attachment. In this way, precise control of the shape of the outlet slot 68 is obtained. The fastening screw or the like 28 and the cooperating thread part of the screen 20 may have the desired embodiment. A particularly simple and good solution is the use of a self-tapping screw 28. It can also be advantageous to use a screen that can be extended or shortened in the circumferential direction, which can be done with simple and per se known means.

Claims

1. Air distributor (10), specially designed for ceiling mounting in compartments and the like, having a main part (12) consisting of a fastening ring (16) and a stud (15) attached thereto, which at the second free end is limited by an extended rotationally symmetrical spreading (14) and a spreading disc (18) covering the spreading and the opening of the studs in the axial direction, the spreading and the spreading disc defining between them a radial outlet gap (68) for a ventilation air flow, characterized in that for being able to suction secondary air (80) located in the space laminarly between said air flow (78) and a building part (44), e.g. a ceiling carrying the air distributor 15 has the plug (15) in a manner known per se, a considerable length, e.g. 0.5-2 times the bump diameter, and is projected protruding substantially this entire length from said building portion, as well as a guide and shield plate (20) extending about half the circumference 20 of said outlet slot (68) and known per se forms attachment for the spreading disc (18), to prevent within its coverage range the outlet of said ventilation air flow, but allow inflow of secondary air towards and past and around the socket (15), and 25 - to increase the ventilation air flow (78) throw length despite relatively low speed, the spreader (14) has in a known manner an outer angle (s) with respect to the bounce (15) which is greater than 90 °, preferably about 120 °, and the spreader (18). ) a slight convex 30 interior to provide the inner contour of the outlet gap, thereby forming a flow angle for the ventilation air flow projecting obliquely from said building portion (44), thereby reinforcing the substructure the yoke between the two. the latter, and the spreading disc forms a weakly concave outer side to conduct secondary air flowing below the ventilation air flow slightly downward, thereby further extending the throwing length of the ventilation air flow. DK 165854B 11

Air distributor according to claim 1, characterized in that the spreading disc (18) has a smaller outer diameter than the spreading (14) in order to better deflect the air flow (78) .5 downwards defined as the downward side forces (86) of the air flow.

Air distributor according to claim 1 or 2, characterized in that the spreading disc (18) is designed interchangeably to obtain different radii of curvature on the outside and / or inside, thereby obtaining different spreading images (82) for the ventilation air flow (78).

Air distributor according to claims 1-3, characterized in that the guide and shield plate (20) has curved, shielding flanges (70) which extend until the spreading disc (18) and 15 extend into the outlet slot (68) to which there is associated sealing pads (72) of elastic material such that these sealing pads abut radially outside the guide plate and shield plate up to its lateral edges (68), and there fill the outlet slot 20 (68) and prevent interfering noise from leakage of inflow air at the flanges (70).

Air distributor according to claims 1-4, characterized in that the guide and shield plate (20) is fixed axially adjustable to the socket (15) by means of an attachment screw or similar (28) available from the outside and / or that the socket (15) and the guide and shield plate (20) have axial control means (22 and 24, respectively).

Air distributor according to one or more of claims 1 to 5, characterized in that the main part (12) is provided with a fastening ring (16) with protruding fastening ears (38) which carry spring shackles (48) intended to engage securely in preferably circumferential recesses, grooves or the like (56) arranged in or at the opening of a ventilation tube (42).