EP0169354A2 - Filter ceiling for filtering air entering a room - Google Patents

Abstract

In a filter ceiling for filtering air entering a room with a latticework (1) which has a plurality of receiving openings (A), and with a plurality of filter elements (2) each consisting of a filter insert (4) made of filter material and one The filter insert-carrying filter frame (3), which is fixed in the associated receiving opening by engaging a substantially horizontal circumferential elastic seal by the sealing force, is provided in the associated receiving opening to improve the gas-tightness of the fixing and to facilitate a filter element change, that the as on filter frame (3) and latticework (1) engaging clamping profile (5; 14; 16; 18: 20: 21; 22; 23; 24; 27: 27 ') formed seal itself is the releasable holding means.

Description

The invention relates to a filter ceiling for filtering air entering a room with a latticework that has a plurality of receiving openings, and with a plurality of filter elements each consisting of a filter insert made of filter material and a filter frame supporting the filter insert, each with the inclusion of an in substantially horizontal circumferential elastic seal by the sealing force applied releasable holding means are fixed in the associated receiving opening.

Such a grid ceiling is known from DE-PS 15 07 773, in which the grid ceiling is constructed from a multiplicity of supporting frames, each of which accommodates one or more filter elements. For this purpose, an inwardly directed flange on which the filter frame rests extends in each receiving opening at its end facing away from the ceiling. The filter elements are pulled gas-tight against the frame by means of mechanical filter clamping devices with screw adjustment, which engage the filter frame and the inward-facing flange. For a gas-tight pressing of the filter elements onto the support frame, several filter clamping devices arranged at a distance must be provided.

A uniform loading of the interposed seal is not always guaranteed with the help of the few filter clamping devices arranged at a distance, so that an absolute sealing seat does not necessarily have to be provided. In addition, the attack requires only a few separately arranged filter clamping devices, both a massive design of the clamping devices themselves and a corresponding design of the components of the lattice work and filter frame that they act on.

Furthermore, from DE-AS 18 15 460 a lattice ceiling is known, in which the latticework consists of U-shaped beams open at the top and in which the filter elements each have a frame with a circumferential extension which projects into the interior of the beams, which interiors contain a possibly solidified barrier liquid. Filling the lattice girders with this barrier liquid and replacing the filter elements in such a lattice ceiling lead to difficulties in operating the filter ceiling.

It is therefore the object of the present invention to provide a grid ceiling in which on the one hand a uniform sealing force is achieved in a simple manner and on the other hand an exchange of filter elements is easily possible.

This object is achieved in that the seal designed as a clamping profile acting on the filter frame and latticework is itself the releasable holding means.

When using such a clamping profile, both the sealing and the filter frame are held in the associated opening of the latticework when the seal is introduced. Since the holding and sealing force is applied evenly along the entire circumference of the filter frame, there is no fear that leaks can occur as a result of uneven sealing force.

The clamping effect of the profile can be built up by appropriately loading the profile during engagement with latticework and / or filter frames or after engagement, as is possible from the following description and the figures.

The individual filter elements can be easily removed and replaced by disengaging the filter element or the latticework and removing the filter element with or without a clamping profile from the opening downwards.

Various elements can be used as components for the grid ceiling, e.g. B. the U-channels according to DE-PS 18 15 460 or the cassette-like support frame according to DE-PS 15 07 773.

The clamping profile is preferably a profile which engages in a gas-tight manner with the lattice work or the filter frame in the region of its one edge and can be elastically deflected in the region of its other edge, the deflected region lying against the filter frame or the lattice work and the sealing force essentially due to the Restoring force of the deflected area is determined. The positive connection with latticework or filter frame can be achieved by introducing the edge area into a corresponding recess or by encircling a corresponding flange, engagement and encirclement by further measures, e.g. B. gluing can be supported.

A particularly simple mechanical construction is achieved if the clamping profile with the outer edge is in a form-fitting and gas-tight engagement with the latticework and the deflected area lies against the filter frame from below and presses it against a circumferential flange at the base of the opening of the latticework, i.e. H. jammed.

A comparable arrangement can be achieved if the clamping profile with the outer edge is in positive engagement with the latticework and the outer area presses against the filter frame from the side and this rests on the clamping profile with a circumferential flange from above.

Another comparatively simple embodiment is achieved if the clamping profile engages with the inner edge in a form-fitting manner, the filter frame stands and the deflected region lies against a vertically circumferential surface of the lattice opening.

However, it is also possible not to apply the holding and sealing force by deflecting the clamping profile in the region of an edge. For this purpose, the clamping profile is provided with two circumferential grooves, a circumferential extension of the filter frame in one groove and a circumferential extension or flange in the other groove of the lattice engages. The grooves can assume different relative positions around each other, e.g. B. preferably include opposing or an angle of 90 °.

With a corresponding design of the cheeks of the groove, the sealing force can be achieved by deflecting the cheeks when inserting the extensions.

However, it is particularly expedient not only to apply the sealing force by deflecting the cheeks when inserting the extensions, but also to provide the clamping profile with at least one further groove for receiving a filler body which essentially determines the sealing force and to introduce such. Clamping profiles of this type with fillers are known per se for fastening glass panes in motor vehicles and the like.

A combination of the one-sided positive engagement with the application of the holding and sealing force without any particular deflection is achieved if the clamping profile is a profile in the area of its one edge which is in a positive and gas-tight manner in engagement with the latticework or the filter frame and is provided with a circumferential groove, wherein a circumferential extension of the filter frame or the lattice engages in the groove. The holding and sealing force can in turn be achieved by appropriate design of the cheeks or preferably by inserting a filler.

Finally, it is possible that at least one of the opposing circumferential surfaces of the filter frame and lattice opening is designed as a wedge surface and the clamping profile between the two surfaces is introduced in such a way that the filter frame and latticework are clamped together in the area of the wedge surface. In this arrangement, the holding and sealing force is determined by the weight of the filter element and the pressure of the air to be filtered and the deformation of the clamping profile. An arrangement which is particularly insensitive to leakages is achieved if at least part of the circumferential surface of the filter frame or the lattice opening is designed as a wedge surface and the assigned surface of the lattice opening or filter frame is designed as an angular surface and the clamping profile is introduced between the two.

The receiving openings and the filter frames have an essentially rectangular cross section in the engagement area with rounded corners, the radius of curvature of which is adapted to the bending behavior of the respective clamping profile.

• Figur 1 eine erste als Teilschnitt gezeigte Ausführungsform der erfindungsgemäßen Filterdecke mit von unten an den Filterrahmen angreifendem einseitig ausgelenktem Klemmprofil,
• Figur 2 eine Teildarstellung gemäß Figur 1 einer weiteren Ausführungsform mit ausgelenktem Klemmprofil,
• Figur 3 eine Teildarstellung einer dritten Ausführungsform mit ausgelenktem Klemmprofil,
• Figur 4 eine Darstellung vergleichbar Figur l einer weiteren Ausführungsform mit einem Klemmprofil, bei der die Dichtkraft durch einen nachträglich eingezogenen biegsamen Füllkörper bestimmt wird,
• Figur 5 eine weitere Ausführungsform mit einem Klemmprofil einschließlich eines Füllkörpers, ;
• Figur 6 eine weitere Ausführungsform mit einem Klemmprofil einschließlich eines Füllkörpers,
• Figur 7a eine Ausführungsform mit Klemmflächeneingriff des Klemmprofils,
• Figur 7b eine weitere Ausführungsform mit Klemmflächeneingriff des Klemmprofils,
• Figuren 8 und 9 weitere Ausführungsformen vergleichbar Figur 7a mit abgewandten Querschnitten der Klemmprofile und
• Figuren 10 bis 12 Ausführungsformen mit Anordnung der Klemmfläche an dem Gitterwerk in Abweichung von den Figuren 7a, 7b, 8 und 9, bei dem die Klemmfläche an dem Filterrahmen vorgesehen ist.

The invention will now be explained in more detail with reference to the accompanying figures. It shows:

• FIG. 1 shows a first embodiment of the filter ceiling according to the invention, shown as a partial section, with a clamping profile deflected from below on the filter frame,
• FIG. 2 shows a partial illustration according to FIG. 1 of a further embodiment with a deflected clamping profile,
• FIG. 3 shows a partial representation of a third embodiment with a deflected clamping profile,
• FIG. 4 shows a representation comparable to FIG. 1 of a further embodiment with a clamping profile, in which the sealing force is determined by a flexible filler which is subsequently drawn in,
• Figure 5 shows a further embodiment with a clamping profile including a filler;
• FIG. 6 shows a further embodiment with a clamping profile including a packing,
• 7a shows an embodiment with clamping surface engagement of the clamping profile,
• 7b shows a further embodiment with clamping surface engagement of the clamping profile,
• FIGS. 8 and 9 further embodiments comparable to FIG. 7a with opposite cross sections of the clamping profiles and
• Figures 10 to 12 embodiments with arrangement of the clamping surface on the lattice work in deviation from Figures 7a, 7b, 8 and 9, in which the clamping surface is provided on the filter frame.

As can be seen from FIG. 1, the filter ceiling is constructed from individual cassettes 1, which determine the receiving openings A with an essentially rectangular horizontal cross section with rounded corners for filter elements 2. The filter elements - as shown schematically - consist of a filter frame 3 and a filter insert 4 arranged in it, which is shown in the figure as a concertina-folded filter paper and filters out suspended matter.

By appropriate shaping a circumferential channel 1b of U-shaped cross section is formed in the vertical wall la of the cassette. A sealing and holding profile or clamping profile 5 with its external holding section 5a is inserted into the U-shaped channel 1b, the upper and lower sides of the clamping profile being provided with teeth 5c to increase the firmness and tightness with the cassette 1. The clamping profile 5 is made of an elastically deformable material, such as. B. neoprene. The clamping section 5b of the clamping profile protruding from the channel 1b can be deflected downward. The deflected clamping section 5b presses the filter element 2 against the base 1c of the cassette, a filter seal 6 being interposed. The filter seal 6 is not absolutely necessary since the seal required for the clean room in engagement areas between the clamping profile 5 and the filter element 2 or the cassette must be built. However, the interposition of the filter seal 6 leads to build up a testing chamber P, with which the _U can be checked mfangsdichtigkeit the filter element. At its end facing the space, the cassette 1 is provided with a flange 1d, in which a perforated cassette 7 is suspended, which serves to even out the air flow.

At its end facing away from the room, the cassette 1 is connected, with the interposition of a hood seal 8, to an air supply hood 9, via which the air to be cleaned is supplied to the filter element 2. (Air can also be applied to the entire space between the filter ceiling and the ceiling.)

The cassettes 1 are fastened to the ceiling by means of suitable hangers 10 and clamping bolts 11.

In the lattice ceiling partially shown in FIG. 1, the cassette 1 is followed by further cassettes 1 for accommodating filter elements and, if appropriate, gas-tight cassettes 12 for accommodating lighting fixtures, sprinkler outlets, loudspeakers or the like. The cassettes, the carrier and the hoods are interconnected by means of suitable connections, e.g. B. screw connections 13, connected so that air enters the room only via the cassettes 1.

In the embodiment shown in FIG. 2, the hood 9, which is part of the latticework, is provided on its lower edge with a flange 9a which extends inwards. The flange engages in a groove 14a in a clamping profile 14 in a gas-tight manner one, which is additionally secured in its position by an angle 9b welded to the hood 9. The inwardly projecting clamping section 14b of the clamping profile 14 is elastically deformable. Like the profile 5, the profile 14 is partially designed as a hollow profile to increase the deformability and to set the restoring force. While deforming the profile, a filter element comparable to filter element 2 has been inserted into the circumferential clamping profile. The frame 3 of the filter element 2 is provided in this embodiment with a horizontally circumferential extension 3a, for. B. by gluing a circumferential sheet metal strip on the frame 3. With this extension, the filter element 2 lies with the interposition of a seal 15 on a nose 14c, whereby a further sealing line is built up.

In the embodiment according to FIG. 3, the cassette 1 is connected to the hood 9 as in the embodiment according to FIG. 1, but the filter insert extends into the hood 9. At its lower end, the frame of the filter 3 is provided with a horizontally circumferential extension 3a 'which extends into a groove 16a of a clamping profile 16 formed with two clamping legs 16b and 16c. By deforming the clamping legs 16b and 16c inwards, the clamping profile 16 lies against a circumferential wall section le of the cassette. At its lower end, the wall section le is provided with a locking lug le '. Here, too, it is possible to set up a further sealing line with the aid of an additional seal 17.

While in the previously described embodiments a deflection of part of the clamping profile takes place during the engagement of the cassette 1 and the filter element 2 with the respective clamping profile in order to build up a sealing force corresponding to the restoring force of the deflected section, this is built up later in the embodiment according to FIG. 4 . In the embodiment according to FIG. 4, a clamping profile 18 is provided with grooves 18a and 18b opposite one another in a horizontal plane. An inwardly directed flange 1f is provided on the cassette 1, while the filter element 1 has an outwardly directed extension 3a '. The flange lf engages; into the groove 18a and the extension 3a 'into the groove 18b. On the side facing the lower end of the cassette 1, the clamping profile 18 is provided with a further groove 18c, into which a deformable circumferential filler body 19 is introduced, which essentially determines the holding and sealing force acting in the grooves 18a and 18b.

In the embodiment shown in FIG. 5, an extension 3b which extends vertically downward is formed on the filter frame 3 and engages in a vertical groove 20b of a clamping profile 20. This clamping profile has a groove 20a in which the flange lf of the cassette engages. The sealing and holding force is in turn essentially determined by a filler 19 introduced into a groove 20c. The filler 19 and the associated groove can have different cross sections.

As FIGS. 4 and 5 show, the position of the grooves in such a clamping profile with a packing can be varied.

In the embodiment according to FIG. 6, a combination between the mounting of the clamping profile 5 according to FIG. 1 and the build-up of a sealing force is built up by introducing a filler body 19. The filter frame engages with the extension 3b in a groove 21b of a clamping profile 21 which engages with a holding section 21a in the channel 1b. The filler body 19 is introduced into a groove 21c.

In the embodiment according to FIG. 7a, the cassette 1 has a vertically extending flange lg and a horizontally extending flange lh in the region of the upper end of the receiving opening A. The filter frame has a wedge surface 3c tapering towards the ventilating space. A hollow clamping profile 22 is introduced between the flanges 1g and 1h and the wedge surface 3c, the cross section of which is essentially adapted to the triangular configuration determined by the clamping angle of the clamping surface. The wedge shape described increases the holding and sealing force built up by deformation of the clamping profile and the weight of the filter element when air is applied to the filter ceiling.

The embodiment according to FIG. 7b differs from the embodiment according to FIG. 7a in that, instead of the vertical surface lg, a wall surface li of the cassette which is bevelled corresponding to the side surface 3c is provided, between which a clamping profile 27 designed as a simple elastic plate is inserted.

In the case of a cassette 1 and hood 9, comparable to FIG. 2, an arrangement with a clamping profile 23 of essentially rectangular cross-section (FIG. 8) or with a clamping profile 24 of essentially circular can also be provided with a corresponding wedge-shaped design of the filter frame 3 Cross-section (see FIG. 9) can be used, the cross-section information relating to the cross-section of the clamping profile not acted upon by the filter element 2.

While in the embodiments according to FIGS. 7a, 8 and 9 the wedge surface is formed on filter frame 3, it is also possible to form the oblique wedge surface on the latticework. In the embodiments according to FIGS. 10 and 11, e.g. B. connected to the cassette an upwardly open circumferential channel 25 or 26 of generally a U-shaped cross section. In the embodiment according to FIG. 10, a vertically extending surface 25a is on the outside, while an inwardly inclined wedge surface 25b is on the inside. The filter frame projects with the vertically extending extension 3b into contact with the wall 25a into the transverse channel 25 and, at an angle on the extension 3d, presses a preferably round clamping profile 27 'into contact with the inner surface of the extension 3b and the wedge surface 25b. In the embodiment according to FIG. 11, the wedge surface 26b is on the outside, while the vertical surface 26a is on the inside.

The embodiment according to FIG. 12 shows that the vertical surface 25a shown in FIG. 10 can be dispensed with under certain circumstances. The inclined wedge surface 13 is formed in one piece with the cassette 1. If a clamping profile 27 'is placed directly on the underside of the filter frame, the transverse extension 3d can also be dispensed with.

It goes without saying that in the embodiments shown, the engagement between the clamping profile and the cassette on the one hand and between the clamping profile and the filter frame on the other hand must be gas-tight.

If the sealing engagement between the adjacent cassettes 1 and 12, which is provided by the screws 13 alone (see FIG. 4), is not sufficient, a preferably compressible or solidifying sealing material can be introduced as a cassette seal 28 in cavities lk in the side walls of the cassette.

Although in the above description the latticework has been described as being made up of cassettes, other filter ceilings are conceivable in which other constructions can be used as supports.

In addition to neoprene alone, blends between natural rubber and neoprene and blends between natural rubber and Buna are particularly advantageous. By choosing suitable materials, the elasticity and the Shore hardness can be adjusted.

The arrangements according to FIGS. 1, 4 and 7 are particularly advantageous since they lead to a particularly easy to assemble and detachable engagement between the filter element and the latticework and, on the other hand, are sufficiently gas-tight.

Claims (10)

1. Filter ceiling for filtering air entering a room with a latticework that has a plurality of receiving openings, and with a plurality of filter elements each consisting of a filter insert made of filter material and a filter frame supporting the filter insert, each with the inclusion of a substantially horizontal circumferential elastic seal are fixed in the associated receiving opening by the sealing force applying releasable holding means,
characterized,
that the gasket designed as a clamping profile (5; 14; 16; 18; 20; 21; 22; 23; 24; 27; 27 ') acting on the filter frame (3) and latticework (1) is itself the releasable holding means. 2. filter cover according to claim 1,
characterized,
that the clamping profile (5; 14; 16) is gas-tight in the region of its one edge (5a; 14a) with the latticework (1) or the filter frame is in engagement and elastically deflectable in the area of its other edge (5b; 14b), the deflected area (5b) resting against the filter frame (3) or the latticework (1) and the sealing force essentially due to the restoring force of the deflected area is determined. 3. filter cover according to claim 2,
characterized,
that the clamping profile (5) with the outer edge is positively and gas-tightly in engagement with the latticework and the deflected area (5b) lies from below against the filter frame (3) and this against a circumferential flange (lc) at the base of the opening (A ) of the latticework (1). 4. filter cover according to claim 2,
characterized,
that the clamping profile (14) with the outer edge (14a) is in positive engagement with the latticework (1) and the outer region (14b) presses from the side against the filter frame and this with a circumferential flange (3a) from above on the clamping profile (14) rests. 5. filter cover according to claim 2,
characterized,
that the clamping profile (16) with the inner edge (16a) is in positive engagement with the filter frame (3) and the deflected area (16b, 16c) against a vertical circumferential Surface (le) of the lattice opening (A). 6. filter cover according to claim 1,
characterized,
that the clamping profile (18) is provided with two circumferential grooves (18a, 18b), a circumferential extension (3a ') of the filter frame (3) in one groove (18b) and a circumferential extension (lf.) in the other groove (18a) ) of the lattice engages. 7. filter cover according to claim 1,
characterized,
that the clamping profile (21) is in the area of its one edge (21a) positively and gas-tightly in engagement with the latticework (1) or the filter frame (3) and provided with a circumferential groove (21b), with the groove ( 21b) a circumferential extension (3b) of the filter frame (3) or the lattice engages. 8. filter cover according to claim 6 or 7,
characterized,
that the clamping profile (18; 21) is provided with at least one further groove (18c; 21c) for receiving a filler (19) which essentially determines the sealing force, and one is introduced into the groove. 9. filter cover according to claim 1,
characterized,
that at least one of the opposite circumferential surfaces of the filter frame (3) or lattice opening (A) is designed as a wedge surface (3c; 25b; 26b; le; lj) and the clamping profile (22; 27; 27 ') is inserted between the two surfaces in such a way that the filter frame (3) and latticework (1) are jammed together in the area of the wedge surface. 10. filter cover according to claim 9,
characterized,
that at least part of the circumferential surface of the filter frame (3) or the lattice opening (A) is designed as a wedge surface (3c) and the assigned area of the lattice opening or filter frame is designed as an angular surface (lg, lh) and the clamping profile (22) is inserted between the two is.

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