DK146348B

DK146348B - AIR DRAFT UNIT FOR EXHAUSTING AIR FROM A SPACE

Info

Publication number: DK146348B
Application number: DK220176AA
Authority: DK
Inventors: Allan Elvir Nilsson
Original assignee: Stifab Ab
Priority date: 1975-05-23
Filing date: 1976-05-19
Publication date: 1983-09-12
Also published as: NO138100C; FR2311997A1; FI56744C; NO761700L; FR2311997B1; SE7505895L; DE2622055A1; GB1537167A; DK220176A; FI761415A; DK146348C; NO138100B; SE390566B; DE2622055C2; FI56744B

Description

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Opfindelsen angår et luftafgangsaggregat til udsugning af luft fra et lokale, hvilket aggregat har et hus, i hvis mod lokalet vendende forvæg der findes en indløbsspalte, og i hvis bort fra lokalet vendende 5 bageste del der findes et udløb indrettet til at være tilsluttet en returluftkanal, som fører bort fra lokalet, og hvori der hersker et undertryk.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an air outlet assembly for extracting air from a room, which has a housing in the front facing the room with an inlet slot and in the rear of the room 5 providing an outlet adapted to be connected to a return air duct. , which leads away from the room and in which there is a suppression.

Opfindelsen tilsigter at tilvejebringe et nyt og i forhold til kendte aggregater forbedret luftaf-10 gangsaggregat af ovennævnte generelle art, ved hjælp af hvilket det er muligt på simpel måde at regulere den fra lokalet via aggregatet og returluftkanalen pr.tidsenhed udsugede luftmængde ved et givet undertryk i returluftkanalen. Luftafgangsaggregatet skal endvidere 15 være udformet på en sådan måde, at den forstyrrende støj, som skabes ved luftens passage ind i og gennem aggregatet, bliver så lille som muligt. Aggregatet skal også have en simpel konstruktiv udformning, så at det kan fremstilles til en lav pris.The invention aims to provide a new and improved air outlet assembly of the above-mentioned general type by means of which it is possible to simply regulate the amount of air extracted from the room via the unit and the return air duct per unit time at a given vacuum. in the return air duct. In addition, the air outlet assembly must be designed in such a way that the disturbing noise created by the passage of air into and through the assembly becomes as small as possible. The unit must also have a simple structural design so that it can be manufactured at a low cost.

20 Dette opnås ifølge opfindelsen ved et aggre gat af den indledningsvis nævnte art, ejendommeligt ved, at indløbsspalten, som har et mindste gennemstrømningstværsnit med konstant bredde, på langsiderne er begrænset af to ved siden af hinanden i huset anbragte lede-25 skinner, hvis indbyrdes afstand kan ændres til ændring af spaltens bredde, og som hver har et foran husets forvæg beliggende, blødt krummet, læbelignende forkantparti med i tværsnit konstant profilform, hvilket forkantparti i strømningsretningen går over i et hovedsagelig 30 plant fladeområde, og at ledeskinnernes plane fladeområder mellem sig indeslutter en kileformet divergerende diffusorpassage, hvis kilevinkel ligger mellem ca. 5° og ca. 10°, og hvilken passages i strømningsretningen bageste ende udgør aggregatets udløb, hvorhos de plane fla-35 deområder er skråtstillet i indbyrdes hovedsagelig samme vinkel i forhold til forvæggens plan.This is achieved according to the invention by an aggregate gate of the type mentioned initially, characterized in that the inlet gap, which has a minimum continuous cross-sectional flow cross-section, is limited on the longitudinal sides by two guide rails arranged mutually spacing can be changed to change the width of the slot, each having a soft, curved, curved, lip-like leading edge portion in front of the housing with a cross-sectional constant profile shape, which leading edge flow direction into a substantially flat surface area and the flat surface areas of the guide rails between them encloses a wedge-shaped divergent diffuser passage whose wedge angle is between ca. 5 ° and approx. 10 ° and which passage in the rear end of the flow constitutes the outlet of the assembly, wherein the planar surface areas are inclined at mutually substantially the same angle with respect to the plane of the wall.

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Herved opnås også samtidig med en simpel og billig konstruktion, at aggregatet udviser en imod.lokalet vendende, hovedsagelig plan forvæg, der er let at rengøre, samt at regulering af den via aggregatet fra lo-5 kalet afgående luftstrøm kan foretages uden demontering af aggregatet og uden anvendelse af specialværktøj, således som det vil blive beskrevet i det følgende.This also ensures, at the same time as a simple and inexpensive construction, that the unit exhibits a room-facing, mainly flat front wall, which is easy to clean, and that control of the air flow exiting through the unit from the local can be done without dismantling the unit. and without the use of special tools, as will be described below.

For at muliggøre denne regulering ved ændring af den indbyrdes afstand mellem ledeskinnerne strækker le-10 deskinnerne sig i en udførelsesform for opfindelsen fra husets ene sidevæg til den modstående, anden sidevæg, hvorhos den ene ledeskinne er fast monteret i huset, medens den anden ledeskinne er fastlåselig i forskellige indbyrdes parallelle stillinger i huset ved hjælp 15 af ét eller flere stilleorganer, eksempelvis stille-skruer.In order to enable this adjustment by changing the distance between the guide rails, the guide rails extend in one embodiment of the invention from one side wall of the housing to the opposite, second side wall, where one guide rail is fixedly mounted in the housing, while the other guide rail is lockable in various mutually parallel positions in the housing by means of one or more actuating means, for example setting screws.

For at den støj, som skabes ved luftens udstrømning gennem aggregatet, skal blive så lille som mulig, har det vist sig at være nødvendigt, at begge lede-20 skinnernes læbelignende forkantpartier som nævnt er beliggende foran husets forvæg. For at den ved udsugningen skabte luftstøj skal blive så lille som mulig, kræves der hovedsagelig symmetrisk luftstrømning over ledeskinnerne, hvilket medfører, at det ikke er tilstrække-25 ligt, at blot kilevinklen er den ifølge opfindelsen definerede, men at ledeskinnemes plane fladeområde som ovenfor anført må være skråtstillet i hovedsagelig samme vinkel i forhold til forvæggens plan.In order for the noise created by the outflow of air through the unit to be as small as possible, it has been found necessary, as mentioned above, for the lip-like frontal portions of both guide rails to be located in front of the front wall of the housing. In order for the air noise created by the suction to be as small as possible, symmetrical air flow over the guide rails is required, which means that it is not sufficient that the wedge angle is only the defined area of the invention, but that the flat surface area of the guide rails as above stated must be inclined at substantially the same angle with respect to the plane of the front wall.

Ved de undertryk, som sædvanligvis anvendes i 30 returluftkanaler fra rum og lokaler, har det ifølge opfindelsen vist sig, at den mindste forstyrrende støj opnås, når kilevinklen mellem ledeskinnnernes plane fladeområder er ca. 7°.In accordance with the invention, the minimum interfering noise is obtained when the wedge angle between the plane surface areas of the guide rails is approx. 7 °.

Opfindelsen forklares nærmere i det følgende ved 35 hjælp af et udførelseseksempel på et aggregat ifølge opfindelsen og under henvisning til tegningen, hvor 3 U6348 fig. 1 viser et aggregat ifølge opfindelsen i perspektiv, og fig. 2 aggregatet i fig. 1 i snit efter linien II-II i fig. 1.The invention will be explained in more detail below by means of an embodiment of an assembly according to the invention and with reference to the drawing, in which FIG. 1 is a perspective view of an assembly according to the invention; and FIG. 2 shows the assembly of FIG. 1 in section along line II-II of FIG. First

5 Det på tegningen viste aggregat har hovedsage lig form af en parallelepipedisk kasse, i hvis forvæg I aggregatets indløbsspalte 2 er beliggende, og i hvis bageste del aggregatets udløb 3 findes. Udløbet er beregnet til at være tilsluttet til en ikke vist 10 returluftkanal, som fører fra det rum, hvori aggregatet er anbragt. I returluftkanalen råder efter aggregatets udløb et undertryk, som tilvejebringer luftudstrømningen fra rummet via aggregatet til returluftkanalen.5 The assembly shown in the drawing is substantially similar in shape to a parallelepipedic box in which the front wall of the inlet slot 2 of the unit is located and in the rear of which the outlet 3 of the unit is located. The outlet is intended to be connected to a return air duct not shown, which leads from the space in which the unit is located. In the return air duct, at the end of the unit, there is a negative pressure which provides the air outflow from the room via the air duct to the return air duct.

Langs kanterne af forvæggen 1 har aggrega-15 tet en ydre ramme 4, som eksempelvis kan være sammensat af L-profiler. Den på tegningen nedre del af forvæggen 1 består af en forplade 5, som er fastgjort i rammen 4. Indløbsspalten 2 har konstant bredde og har en mindste gennemstrømningstværsnitsbredde a (se fig.2).Along the edges of the front wall 1, the assembly has an outer frame 4, which may, for example, be composed of L-profiles. The lower part of the front wall 1 in the drawing consists of a front plate 5 which is fixed in the frame 4. The inlet slot 2 has a constant width and has a minimum flow cross-section width a (see Fig. 2).

20 Ved langsiderne, dvs. foroven og forneden på tegningen, begrænses indløbsspalten af to i huset anbragte ledeskinner 6, 7. Ledeskinnerne strækker sig begge fra husets ene sidevæg 8 til den modstående anden sidevæg 9. Den på tegningen øverste ledeskinne 6 er i den vi-25 ste udformning fast monteret i huset, medens ledeskinnen 7 er indstillelig og kan fikseres i forskellige stillinger i huset ved hjælp af to stilleskruer 10, som går gennem et hul i en med forvæggen parallel forpladedel II af ledeskinnen 7 og videre gennem lodrette aflange 30 åbninger 12 i forvæggens forplade 5. På indersiden af forpladen 5 findes modholdsdele, eksempelvis i form af modholdsplader 13 eller møtrikker, afhængig af skruetypen.20 At the long sides, ie. At the top and bottom of the drawing, the inlet slot is limited by two guide rails 6, 7 located in the housing. The guide rails both extend from one side wall 8 of the housing to the opposite other side wall 9. The upper guide rail 6 in the drawing is fixedly mounted in the furthest configuration. in the housing, while the guide rail 7 is adjustable and can be fixed in different positions in the housing by means of two adjusting screws 10, which pass through a hole in a front wall portion II of the guide rail 7 parallel to the wall and further through vertical elongation 30 openings 12 in the front plate 5 On the inside of the front plate 5 there are retaining parts, for example in the form of retaining plates 13 or nuts, depending on the type of screw.

I området foran husets forvæg 1 har hver 35 ledeskinne et let krummet læbelignende forkantparti 14. Forkantpartierne har konstant profilform langs hele ind-In the area in front of the front wall 1 of the housing, each 35 guide rail has a slightly curved lip-like front portion 14. The front portions have a constant profile shape along the entire interior.

Claims

146348 race slot. Behind the leading edge portions 14, the guide rails 6, 7 have planar flat regions 15 defining between them a wedge-shaped divergent diffuser passage 16. The wedge angle B of the wedge-shaped divergent passage 16 5 is selected in the range between approx. 5 ° and approx. In a preferred embodiment is approx. 7 °. The rear portion of the passage 16 in the direction of flow constitutes the outlet of the assembly 3. In order to provide symmetrical flow in the passage 16, the flat surface areas 15 are set 10 at the same angle with respect to the plane of the front wall 1. Put another way, this implies that each surface area 15 forms an angle of 0.5 6: with a plane which is perpendicular to the front wall 1, which is in the middle of the passage 16.

Although, in the embodiment shown, the upper guide rail 6 is secured in the housing, while the lower guide rail 7 is arranged to be fixed in different positions in the housing, of course there is nothing to prevent both guide rails can be set and locked in the housing, i. can be set in different positions. At a given constant vacuum in the return air duct to which the outlet of the unit is connected, varied air flow through the unit is achieved by changing the width of the inlet slot 2, ie. by changing the distance a at the narrowest part of the gap. As mentioned above, the width of the gap is changed by shifting the lower guide rail 7 relative to the housing to a desired position relative to the upper, fixed guide rail 6 in the housing and then being locked in the desired position by tightening the screws 10 .

1. A vent for air extraction from a room, which has a housing in the front wall (1) of which there is an inlet slot.