FI56744C - FRAONLUFTSDON FOER UTSUGNING AV LUFT FRAON RUM - Google Patents

Description

• λ £ * Τ · \ rR1, ΛΛ, ANNOUNCEMENT c λ n λ a J & fQ 11 UTLÄGGNINGSSKRI FT 30/44 C ^ Patent granted on 10 03 1930 j Patent meddelat (51) Ky.lk. * / Lnt.CI * F 24 F 13/08 FINLAND — FINLAND (21) Patent application — P »t« ntansftknlng 7611 * 15 (22) Htktmltplivl — Antftknlngtdtg 19.05.76 (23) Alkuplivi — Glltighrtsdag 19.05.76

(41) Made public — Blivlt offentllg ok Π tA

National Board of Patents and Registration '(+4) Date of publication and date of publication—

Patent- OCh registerstyreisen An * 6kan utlagd och utl.skriftan publlcerad 30.11.79 (32) (33) (31) Requested privilege — Begird prlorltet 23.05.7 5

Sweden-Sweden (SE) 7505895-8 (71) Stifab AB, Kindgrensgatan 16, S-552 68 Jönköping, Sweden-Sweden (SE) (72) Allan Elvir Nilsson, Tomelilla, Sweden-Sweden (SE) (7 ^) Oy Kolster Ab (51 *) Exhaust air for obvious suction from the room - Fränluftsdon för utsugning av luft frän rum

The present invention relates to an exhaust air device for sucking air from rooms (apartments), comprising a housing having an inlet in the front wall facing the room and an outlet at the rear facing away from the room, adapted to be connected to a vacuum return duct from the room.

The solutions used so far are represented, for example, by the Swedish publication Publication 3½ 5 ^ 7 and the British patent publication 1 266 057-. A common basic feature is that the connection leading to the outlet channel through the device narrows in the flow direction, essentially as a truncated cone or pyramid.

The object of the invention is to provide a new and improved exhaust air device of the type mentioned at the beginning compared to known devices, by means of which it is possible to regulate in a simple manner the amount of air sucked from a room or apartment through the device (and return air duct) per unit time by vacuum in the return air duct. The exhaust air device must still be such that the annoying noise generated by the passage of air into and through the device is kept to a minimum. The exhaust air device must also be simple in construction so that it can be manufactured at low cost. The design of the device should still be such that it has a front wall facing the room which is substantially flat and which can be easily cleaned. It must still be possible to adjust or change the air flow leaving the room through the appliance without dismantling the appliance and without requiring special tools.

Said object is achieved according to the invention by an exhaust air device of the type mentioned at the beginning, characterized in that the inlet gap with a uniform minimum flow cross-section is bounded a softly bent, lip-shaped front edge portion with a constant cross-sectional shape, which is connected in the flow direction to a substantially flat surface area and that the flat surface areas of the guide rails enclose a wedge-shaped expanding diffuser path with a wedge angle of approx. 5 °. n, and whose bus rear end Calavirtaosa) forms the outlet of the device, with the flat surface areas being inclined at substantially the same angle to the plane of the front wall.

To allow the mutual distance between the guide rails to be changed, either one guide rail can be fixedly arranged in the housing, while the other is adjustably fitted, or both guide rails can be adjustable to different positions in the housing and thus also relative to each other. In order to keep the noise generated by the air flowing out through the device to a minimum, it has proved necessary that the lip-like front-edge portions of both guide rails are located in front of the front wall of the housing. In order for the air noise generated during suction to remain desirably low, a substantially symmetrical flow of air over the guide rails is required, which means that it is not enough that only the wedge angle is defined by the invention, but that the flat surfaces of the guide rails must also be inclined substantially at the front wall level. .

In a very simple but nevertheless very efficient embodiment of the exhaust air device according to the invention, guide rails extend from one side wall of the housing to its opposite second side wall and the second guide rail is fixedly mounted in the housing, while the second guide rail can be locked to the housing in different parallel positions. by means of several adjusting elements, e.g. with adjusting screws. The set screws are then arranged so that their ends can be accessed from the front wall side of the device, ie from the inside of the room.

The vacuum normally used in return air ducts from rooms and apartments has been shown to cause the least possible disturbing noise if the wedge angle between the flat surfaces of the guide rails is about 7 °.

The invention will be explained in more detail below and described with reference to an exemplary embodiment of an exhaust air device shown in the accompanying drawing.

In the drawing, Figure 1 shows an embodiment of an exhaust air device according to the invention in a perspective view. Figure 2 shows the device according to Figure 1 in cross-section along the line II-II in Figure 1.

The exhaust air device shown in the drawing has the shape of a substantially parallelepiped-shaped box with an inlet slot 2 in the front wall 1 and an outlet 3 in the rear of the device. The outlet is intended to be connected to a return air duct (not shown) leading to the room. In the return air duct, there is a vacuum downstream of the outlet of the device, which causes an air flow from the room through the device to the exhaust air duct.

Along the edges of the front wall 1, the exhaust air device has an outer frame 4, which can be connected, for example, from L-profiles. In the drawing, the lower part of the front wall 1 consists of a front plate 5 fixed to the frame 4. The inlet gap 2 is evenly wide and has the smallest cross-sectional width ot (see Fig. 2). On the long sides, i.e. in the drawing from above and below, the inlet gap is limited by two guide rails 6.7 arranged in the housing. Both guide rails extend from one side wall 8 of the housing to its opposite second side wall 9. In the drawing, the upper guide rail 6 is fixedly mounted in the housing in the embodiment shown, while the guide rail 7 is adjustable and fixed in different positions in the housing by two adjusting screws 10 passing through the front wall. through the vertical, elongate openings 12 in the front panel part 11 of the rail 7 and further in the front panel 5 of the front wall. Inside the front cover 5 there are counter-holding parts, e.g. stop dampers 13 or nuts "56744 depending on the type of screw.

In the area in front of the front wall 1 of the housing, each guide rail has a softly bent lip-like front edge part 14. The front edge parts have a standard profile shape along the entire length of the inlet opening. From the leading edge portions 14 in the flow direction, the guide rails 6, 7 have flat edge regions 15 which form a wedge-shaped expanding diffusion path 16. The wedge angle än of the wedge-shaped path 16 is selected from a range of about 5 ° and about 10 °. °, and in a preferred embodiment it is about 7 °. · The downstream part of the bus 16 forms the outlet 3 of the device. In order to achieve a symmetrical flow in the bus 16, flat surface areas 15 are set at the same angle to the plane of the front wall 1. In other words, this means that each surface area 15 forms an angle of 0.5 ^ 3 perpendicular to the front wall 1 with a conceivable plane passing in the middle of the bus 16.

Although in the embodiment shown the upper guide rail 6 is fixedly arranged in the housing, while the lower guide rail 7 is arranged to be fixed to the housing in different positions, there is of course nothing to prevent both guide rails from being adjustably lockable in the housing, i.e. adjustable to different positions.

When a certain constant vacuum prevails in the return air duct to which the outlet of the exhaust air device is connected, a changed air flow through the device is obtained by changing the width of the inlet gap 2, i.e. by changing the distance oc in the narrower part of the gap. The change in the width of the gap is effected, as already mentioned above, by moving the lower guide rail 7 adjustable relative to the housing to the desired position relative to the upper guide rail 6 fixed to the housing and then locking it in the desired position by tightening the screws 10.

Finally, it should be mentioned that the embodiment of the exhaust air device according to the invention described above and shown in the drawing represents only one possible embodiment of the invention, which, however, can be made in many alternative ways within the scope of the claims below.

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Claims (3)

5,56744 Claims. An exhaust air device for extracting air from rooms (apartments), comprising a housing having an inlet slot (2) in the front wall (1) facing the room and an outlet (3) at the rear facing away from the room, adapted to be connected to a return air duct leading to the room, there is a vacuum, characterized in that the inlet gap (2) with a uniform, smallest flow cross-section is limited on long sides by two guide rails (6,7) arranged side by side in the housing, the mutual distance (oO) of which can be varied to change the gap width. a softly bent, lip-shaped front edge portion (14) with a constant cross-sectional shape in front of the front wall (1) of the housing, which is connected in a flow direction to a substantially flat surface area (15), and that the flat surface areas of the guide rails (6,7) 15) close a wedge-shaped expanding diffuser path (16) with a wedge angle iyS) of n. Between 5 ° and about 10 °, and the rear end (downstream part) of the bus forming the outlet (3) of the device, with the flat surface areas being inclined at substantially the same angle to the plane of the front wall (1). Exhaust air device according to claim 1, characterized in that the guide rails (6,7) extend from the second side wall (8) of the housing to the opposite second side wall (9), and that the second guide rail (6) is fixedly mounted in the housing while the second guide rail (6) 7) can be locked (fastened) to the housing in different mutually parallel positions by means of one or more adjusting members, e.g. with adjusting screws (10). Exhaust air device according to Claim 1 or 2, characterized in that the wedge angle (/ 5) is approximately 7 °.