DD291621A5 - REVISION CLOSURE FOR INSULATED LEAD CHANNEL CONVERSIONS - Google Patents

Abstract

A maintenance cover with a maintenance opening and a maintenance lid for an insulated sheet-metal duct wall has a sheet-metal ring (23) running around the opening at right angles to the duct wall, which is constructed as a profiled sheet-metal strip. The sheet-metal ring (23) has an essentially U-shaped cross-section, with a centre part (13), a first limb (27) and a second limb (15) between which the insulation (12) is enclosed. On the first limb (27) there is integrally formed a folded pocket (14) with which the sheet-metal ring (23) is inserted into the section of the duct wall. The maintenance lid has an inner lid (11) and an outer lid (10), which can be drawn firmly against one another and rest in each case with one clamping edge on the duct wall (16) or on the sheet-metal ring (23) respectively. <IMAGE>

Description

For this 7 pages drawings

Field of application of the invention

The invention relates to a revision closure for insulated sheet metal channel walls with inspection opening and inspection cover according to the preamble of claim 1.

Characteristic of the known state of the art

Sheet metal ducts, which are used in the air conditioning and ventilation technology, are often provided with an insulating layer for the purpose of thermal insulation and / or noise damping. This insulating layer, which may for example consist of glass wool, can be applied either as external insulation from the outside or as an inner insulation from the inside to the sheet metal wall. The top of the insulation is usually by a lamination, z. B. in the form of an aluminum foil protected. Such sheet metal ducts must also have inspection openings for inspection, maintenance of duct installations and for cleaning, which are to be closed with inspection doors, covers, flaps or the like.

In an arrangement known from DE 8225276U1 the inspection cover consists of an elongated, oval outer cover with a clamping edge on all sides, which is connected to an inner cover of the same shape and size via two bolts, which are festz'ehbar from the outside by screw buttons.

If such a Revisionsdeckei be used for an insulated sheet metal channel wall, then the inner edge of the insulating layer can be covered and enclosed warden by an attached to the channel outer wall by screws or rivets, conically widening outward sheet metal ring. For this purpose, the insulation must be cut in the wide cover area, with the result that the whole area including the inspection cover forms a cold bridge. In another embodiment according to the above utility model is a two-piece sheet metal ring, which is aligned with the inspection opening and covering the inspection opening facing edge of the insulating layer is provided. Outer cover and inner lid lie directly on the metal ring or on the channel wall. The disadvantage here is that the sheet metal ring must be fixed because of the thin channel wall to the channel wall with a variety of rivets or screws. In addition, the frame must be sealed with internally insulated Blachkanälen additionally with a sealant.

Object of the invention

The aim of the invention is to reduce the cost of such inspection closures and the prevention of Kältebzw. Thermal bridges.

Explanation of the essence of the invention

The object of the invention is to improve a revision lock with inspection opening and inspection cover for insulated Blechkahalwandungen so that the assembly is facilitated and a low-cost production is possible.

At the same time, the insulating effect of the inspection closure should be improved.

This object is achieved in a generic inspection closure with the features characterized according to claim 1. The profiled sheet metal ring according to this proposal can be cut in the required length> ür the sheet metal section of the inspection opening and plugged in a simple way with the folding pocket on the edge of the sheet metal neck. Dor sheet metal ring has a substantially U-shaped cross section, with a central part, a first leg and a second leg, between which the insulation of the channel wall is enclosed. At a

External insulation of the sheet metal ring is inserted with the provided on the first leg of the U-profile folding pocket in the opening, that the second leg of the U-shaped profile surrounds the insulation from the outside. The same sheet metal ring can be used without changes for internal insulation. In this case, it is used with the folding tray so in the sheet metal section that the second leg of the U-shaped profile includes the insulation from the inside.

To seal the inspection opening, the inner cover in vorteilha Her execution on the outside of the clamping edge on a sealing strip, which rests on the sheet metal ring. For externally insulated Blechkanalwandungen the folding pocket of the sheet metal ring is preferably sized so that it is covered by the overlying inner lid and that the sealing strip of Innenendeckdls seals with dot sheet metal wall of the channel.

When internally insulated duct walls, the sealing strip of the inner cover rests on the second leg of the sheet metal ring from the channel inside. To improve the seal may additionally be provided in the folding pocket a seal. For this purpose, z. B. be a permanently plastic sealant injected into the folder pocket.

The sheet metal ring preferably has a smaller curvature than the sheet metal cutout prior to installation in the inspection opening. As a result, the sheet metal ring is securely fixed after installation by its residual stress in the cutout.

The Stoßs & ll of the two opposite ends of the sheet metal ring may be connected in an advantageous development, for example, by a metal strip which is inserted into slots of the metal strip. In addition, the joint can be covered by a self-adhesive aluminum strip.

For particularly high demands on the insulation and tightness of the inspection opening, the inner lid can be made in two parts, namely from a flat cover plate, which rests on the inside of the Biechkanalwandung or on the sheet metal ring, and a profiled center plate. The center panel is frusto-conical and has in the edge region a circumferential bead that projects along the opening and projects outward. The two parts of the inner lid can be connected to the transitional teat between the jacket of the truncated cone and the bead with the Abdeckplätte by means of screws or rivets. The cover plate is coated in the direction of the channel outside with a continuous insulation. The edge of the cover plate is preferably angled slightly outwards. Thereby

the pressing of the seal is supported on the channel wall in an area outside the sheet metal ring inserted into the opening. Due to the insulation of the cover plate, the z. B. may consist of polyethylene foam, lying in the channel interior, heat-absorbing cover plate is thermally insulated from the other inspection cover. The bead-shaped edge of the center panel of the inner cover ensures the centering of the inspection cover on the inserted metal ring. Its strong profile gives stability to the whole inner lid and ensures that the forces exerted by tightening the outer deck are transmitted to the edge of the seal. The smooth inside of the cover plate with the bevelled edge is aerodynamically very favorable for the flow within the sheet metal channel.

In a further advantageous embodiment, inner lid and outer lid are detachable from each other. On the inner lid two short bolts are provided on which the outer cover with threaded sleeves is tightened, which are rigidly connected with screw buttons on the outside of the outer cover. To allow a particularly simple installation, several spring clamps are mounted on the edge of the inner lid.

The inner lid is first twisted inserted into the inspection opening and then rotated to its final position. When tightening the handle bar outward snap the spring clips on the sheet metal ring and fix so the inner lid on the channel wall. Then the outer cover can be placed on the inner lid and fixed by turning the screw knobs. The removal happens in reverse order.

In this embodiment, an additional insulating layer can be provided on the inner wall of the outer cover in a particularly advantageous manner. In addition, the bolts do not protrude outwardly from the Schraubknöpfen, as they are fixed with threaded sleeves on the bolts.

Ausfuhrungsbeisplele

The invention is explained below with reference to exemplary embodiments, which are illustrated in the drawings. Show it

1: a partial section of an externally insulated sheet metal channel wall with inspection opening and inserted inspection cover; FIG. 2: a partial section of an internally insulated sheet metal channel wall with inspection opening and inserted inspection cover; FIG. 3: a partial section of an externally insulated sheet metal channel wall with inspection opening and inserted inspection cover in an alternative embodiment .

Fig. 4: a perspective view de.i profiled sheet metal ring, partially in the Biechausschnitt the inspection opening

is inserted,,

5 shows a perspective view of the sheet-metal ring connected to a metal strip at the abutment part according to FIG. 4, FIG. 6 shows a cross-section of the blanching bench,

6a shows a cross section of the sheet metal strip in an alternative embodiment,

FIG. 7: a perspective view of the abutting parts of the sheet metal ring according to FIG. Fig. 4a with a glued aluminum strip, Fig. 7 a: a section through the sheet metal ring along the line A- A gem. Flg. 7, Fig. 8: a partial section of an externally insulated sheet metal channel wall with Revisi jnsöffnung and inserted inspection cover in

in a further embodiment, Fig. 9: ..a partial section of the sheet metal channel wall with inspection opening and inspection cover along the line VIII-VIII gem.

Fig. 8.

A Kinalwandung 16, which is provided with an outer insulation 12, has an oval revision opening, in which, according to FIG. 1, an inspection cover with an outer base 1 and an inner lid 11 is inserted. The insulation 12 is bordered on the edge of the sheet metal insert with a sheet metal ring 23, which is formed as a profiled sheet metal strip. The sheet metal ring 23 has a substantially U-shaped cross-section, with a central part 13, a first leg 27 and a second leg 15, between which the insulation 12 is enclosed. The end of the first leg of the U-shaped sheet metal strip is profiled in an S-shape, the conclusion of which is formed by a U-shaped Falztascho 14.-The metal ring 23 is pushed with de: folding pocket 14 on the edge of the cutout in the channel wall 16 so in that the edge of the cutout is enclosed inside and outside by the folding pocket 14. Conveniently, the sheet metal ring 23 before insertion a slightly smaller curvature than the sheet metal section. It is then securely fixed in the cutout after insertion by its thread tension. In addition, according to FIG. 5, it can be secured at the joint 52 between the two ends by means of a sheet-metal strip 51. For this purpose, two Schliize 50 are punched in the middle part 13 of the sheet metal ring 23 at the two ends. The metal strip 51 is inserted into the resulting tabs. Aging itiv or additionally, the Stoßsteilo 52 of the sheet metal ring 23 may be pasted over according to Figure 7 or 7 a with a self-adhesive aluminum strip 37. Outer cover 10 and inner lid 11 of the inspection cover have according to Figure 1 the same shape and size. Both lids have on the outside a clamping edge 26,28 which runs around on all sides. The clamping edge 28 of the outer cover 10 rests on the second leg 15 of the U-shaped profiled sheet metal ring 23. The clamping edge 26 of the inner lid 11 carries on its direction towards the outer lid 10 side facing a sealing strip 21, for example in the form of a self-adhesive foam strip. The sealing strip 21 covers the folding pocket 14 of the sheet metal ring 23 and is sealingly on the channel wall 16 on the inside of the sheet metal channel.

To the planar clamping edges 28,26 of outer cover 10 and inner cover 11 is followed by an obliquely outwardly extending, curved portion, which merges into a recessed inwardly arched portion 36. The middle section of outer cover 10 and inner cover 11 is slightly offset outwards and each contains a bolt 18 (in Figure 11st only recognizes a bolt because of the representation in cross section through the oval inspection cover). Trained as a lock screw bolt 18 is fixed with its head 22 on the inner lid 11 and passes through the outer lid 10, which can be tightened by the screw 20. The shank of each bolt 18 is comprised of a cylindrical coil spring 19 which spreads the outer lid 10 and the inner lid 11 apart when not tightened to facilitate insertion of the inspection lid into the inspection opening.

To insert the screw 20 is turned out to the stop 17 at the end of the bolt 18, wherein inner lid 11 and outer lid 10 are spread apart by the spring 19. Dar oval revision cover can be used after twisting against the longitudinal axis in the inspection opening. It is usually sufficient already a rotation of 30 °. After turning back and fitting the inner lid 11 in the oval cutout, the two screw 20 are tightened until the outer lid 10 rests with its clamping edge 28 outside on the leg 15 of the sheet metal ring 23 and the seal 21 on the clamping edge 26 of the inner lid 11 with the folding pocket 14th or the channel wall 16 seals. As shown in Figure 2, the same sheet metal ring 23 can also be used for enclosing the insulation with internally insulated sheet metal ducts. The only difference from Figure 1 is that the sheet metal ring 23 is inserted with its folding pocket 14 in the neck, that the second leg 15 of the sheet metal ring 23 encloses the inner insulation 25 from the inside. The sealing strip 21 of the inner lid 11 is then directly on this leg. As a rule, this is sufficient to seal the inspection opening. In the case of particularly high demands on the tightness, an additional seal 29 can be provided in the folding pocket 14, for example in the form of a permanently plastic sealing compound, which is injected into the folding pocket, as shown in FIG. 6a. Although normally no additional insulation is required because of the relatively large distance between the outer lid 10 and the inner lid 11 in order to avoid larger heat losses on the inspection cover, a revision lid constructed according to FIG. 3 can be used for particularly high requirements. The inner lid 11 'is constructed in two parts; it consists of a profiled center plate 30, in the central region of the two bolts 18 are arranged in the manner previously described, and a flat cover plate 34 which bears against the inner wall of the sheet metal channel. The middle plate 30 of the inner lid 11 'is formed frustoconical and has in the edge region a circumferential along the cutout of the inspection opening, outwardly projecting bead 31. At the transition point between the jacket of the truncated cone and the bead 31, the center plate 30 is connected to the cover plate 34 by rivets 32, plastic screws or the like. On the outside of the cover plate 34 is a continuous insulating layer 33 of elastic material, for. B. of polyethylene foam, applied. The edge 35 of the cover plate 34 is slightly angled outwardly, whereby the pressing of the seal is facilitated to the channel wall 16 in the area outside the folding pocket 14.

Possible cross-sectional shapes of the profiled sheet metal ring 23; 23 'are shown in Figures 6 and 6a. The sheet-metal strip has a substantially U-shaped cross-section, with a central part 13; 13 'a first leg 27 and a second leg 15. At the first leg 27, a U-shaped folding pocket 14 is arranged so that the free leg has in the same direction as the second leg 15 of the U-shaped profile. Glad figure 6, the folding pocket 14 is in an opposite U-shaped bend over, so that a total of between the middle part 13 umi the first leg 27 creates an S-shaped profiling.

In an alternative embodiment can be provided according to Figure 6a in addition to the U-förmiger Falztaschu 14 at the end of the first leg 27, a second U-förmlge f -'alztasche 24 of the same shape and size, which points in the same direction and directly into the second. Leg 15 'of the U-shaped profile passes. To improve the seal in this embodiment, a seal 29 is additionally injected from permanently flexible sealant into the folding pocket 14 on the first leg. Such a seal can also be provided in the other embodiment of the sheet-metal ring 23 according to FIG.

Even in existing sheet metal channel walls, the described arrangement can be installed easily. There. 'In an externally insulated sheet metal channel wall first, the insulation is cut out in the desired size and then introduced the cutout in the Bi echkanalwandung. The sheet-metal strip, which has a slightly larger bending radius before installation in the cutout, is then inserted with its folding pocket 14 on the first leg 27 of the U-shaped profile into the cutout. If desired, it can be additionally fixed at the joint of the two ends by a sheet metal strip and sealed by means of a self-adhesive aluminum strip. When inserting the metal strip is only to make sure that the insulation is bordered iaubar and not damaged. After inserting and fixing the Bloohbandos the revision opening can be closed with the revision cover.

In the figures 8 and 9, a further embodiment of the Revisiorisdeckels is shown. The lid consists of a Ir nendeckel 11 "and one outer cover 10", which have substantially the same shape as described above with reference to Figures 1 and 2. In order to allow a particularly simple insertion or removal of the inspection cover, however, inner lid 11 "and outer lid 10" are completely separable from each other.

On the inner lid 11 "are two outwardly projecting bolts 18" attached, which are shorter than the bolts of Figure 1 and 2 respectively. In two holes 83 are each a screw button 20 "on the outside of the exterior, eckeis 10" held, which are connected to a threaded sleeve 81 on the inside of the outer cover 10 ".

Between the two bolts 18 "of the inner lid 11" is a U-shaped bent handle bracket 80 with its two inwardly bent ends 82 attached. For attachment, the two ends 82 are penetrated by a respective bolt 18 "and fixed by a pressed bead 92 relative to the head of the bolt 22 on the inside of the inner lid 11". On the all-round circumferential edge 26 of the inner lid 11 ", which is slightly larger than the cutout of the inspection opening, four Ff derklammern 91 are pushed with a U-shaped clamping tab 93. Between the clamping edge 26 and the channel wall 16, a circumferential sealing strip 21 is arranged.

If the inspection opening is to be closed, first the inner lid 11 "is inserted into the opening and then brought into its final position For example, the outer cover 10 "can be placed on the inspection opening and tightened by threading the screw knobs 20" with the threaded sleeves 81 on the bolts 18 ", the sealing strip 21 airtight with the channel turn 16. In this embodiment, for the purpose of Particularly good thermal insulation one additional insulation layer 90 may be provided on the inside of the outer cover 10 ". This insulating layer is not shown in Figure 8 for the sake of clarity. The sheet metal ring 23 'inserted into the inspection opening preferably has a shape according to FIG. 6a, since in this embodiment the sheet metal ring can easily be bent into the oval shape of the inspection opening.

Claims (27)

1. Inspection lock for insulated Blechkanalwandungen, with inspection opening and inspection cover, with a circulating around the opening perpendicular to the channel wall sheet metal ring having a U-shaped cross-section, with a central part, a first leg and a second leg, between which the insulation in the Opening is enclosed, wherein the inspection cover has an inner lid and an outer lid, which are mutually tightened and wherein both covers have a resting on the channel wall or on the sheet metal clamping edge and on at least one clamping edge a seal is provided, characterized in that the sheet metal ring (23 ) consists of a profiled sheet metal strip, wherein on the first leg (27) βϊηβ folding pocket (14) is integrally formed with the sheet metal ring (23) so ajf the opening in the channel wall (16) is pushed, that the folding pocket (14) Sheet metal edge of the opening from inside and outside encloses. 2. A closure according to claim 1, characterized in that the sheet metal ring (23) at its first leg (27) is S-shaped folded, wherein the conclusion of the S-shaped fold of the folding pocket (14) is formed, in the same Direction points like the second leg (15) of the U-shaped profile. 3. A closure according to claim 1, characterized in that the second leg (15 ') of the sheet metal ring (23') merges into a U-shaped folding pocket (24) of the same shape and size as the folding pocket (14) on the first leg (27). the sheet metal ring (23 '), both folding pockets pointing in the same direction. 4. Closure according to claim!, Characterized in that the inner lid (11) on the outside of its clamping edge (26) has a sealing strip (21). 5. A closure according to claim 4, characterized in that the sealing strip (21) of the inner lid (11) covers the folding pocket (14) of the sheet metal ring (23) on the channel inside and sealingly rests on the channel wall (16). 6. A closure according to claim 4, characterized in that the sealing strip (21) of the inner lid (11) rests on the second leg (15) of the sheet metal ring (23) from the channel inside. 7. Closure according to claim 4 and 5, characterized in that in the folding pocket (14) a seal (29) is provided. 8. A closure according to claim 1, characterized in that the sheet metal ring (23) is fixed by its acting in the direction of the edge of the inspection opening residual stress in the inspection opening. 9. A closure according to claim 1 and 8, characterized in that the two opposite ends of the sheet metal ring (23) at its joint (52) are connectable. 10. A closure according to claim 9, characterized in that the two opposite ends of the sheet metal ring (23) at its joint (52) by a metal strip (51) are connectable, in slots (50) on the central part (13) of the sheet metal ring (23 ) can be inserted. 11. Closure according to claim 1; 9 and 10, characterized in that the joint (52) of the two opposite ends of the bending ring (23) by a self-adhesive aluminum strip (37) can be covered. 12. A closure according to claim 1 to 10, characterized in that the inspection opening and inspection cover have an elongated oval shape. 13. A closure according to claim 1 and 4, characterized in that on the inner lid (11) two outwardly facing bolts (18) are provided which pass through the outer cover (10), and by means of Schraubknöpfen (20) against the tension of between outer cover (10) and inner cover (11) provided screw shape (19) are tightened. 14. Closure according to claim 13, characterized in that the screw heads (20) are partially received in a recess (36) of the outer cover (10). 15. A closure according to claim 13, characterized in that inner cover (11) and outer cover (10) have the same shape and size. 16. A closure according to claim 14, characterized in that the inner lid (11 ') consists of a profiled center plate (30) and an associated planar cover plate (34) which covers the inspection opening on the channel inside. 17. A closure according to claim / l 6, characterized in that the central plate (30) of the inner lid (11 ') is formed kogelstumpfförmig and in the edge region a circumferential along the access opening, outwardly projecting bead (31). 18. A closure according to claim 17, characterized in that the center plate (30) of the inner cover (1 V) at the transition point between the jacket of the truncated cone and the bead (31) to the cover plate (34) by means of screws or rivets (32) is. 19 V 'closure according to claim 16,17 or 18, characterized in that on the outside of the cover plate (34) an insulating layer (33) is applied. 20. Closure according to claim 16 to 19, characterized in that the cover plate (34) has an edge (35) which is angled in the direction of the channel wall (16). 21. A closure according to claim 16 to 20, characterized in that the edge (35) of the cover plate (34) covers the folding pocket (14) of the sheet metal ring (23) and sealingly rests on the channel wall (16). 22. A closure according to claim 1 to 12,14 or 15, characterized in that on the inner cover (11 ") two outwardly facing bolts (18") are provided, on which the outer cover (10 ") by means of threaded sleeves (81) with screw buttons (20 ") on the outside of the outer cover (10") are rigidly connected, can be tightened, the outer and inner lid are completely separated from each other after loosening the screw. 23. A closure according to claim 22, characterized in that on the inner lid (11 ") is provided an outwardly projecting handle bar (80), 24. Verschiuß according to claim 22 or 23, characterized in that the handle bar (80) is bent in a U-shape and with its both ends (82) together with the bolts (18 ") on the inner lid (11") is fixed. 25. A closure according to claim 24, characterized in that the handle bar (80) at its two ends.i (82) of the bolts (18 ") is penetrated and is penetrated at its outwardly projecting handle part of the threaded sleeves (81). 26. Closure according to claim 23 to 25, characterized in that on the clamping edge (26) of the inner lid (11 ") as an assembly aid a plurality of spring clips (91) is fixed, the tightening of the inner lid (11") by means of the handle bracket (80) snap outwards on the sheet metal ring (23, 23 ') and fix the inner cover (11 ") on the sheet metal ring (23, 23'). 27. A closure according to claim 23 to 26, characterized in that on the inside of the outer cover (10 ") an insulating layer (90) is provided.