WALL SLEEVE SYSTEM FOR A VENTILATION SYSTEM

Abstract

A wall sleeve system for a ventilation system comprises one or more assemblies constituted in a modular manner, which can be flexibly combined with one another.

Claims

1. A wall sleeve system for a ventilation system, comprising one or more assemblies constituted in a modular manner, wherein at least two different selections from the assemblies can be combined with one another to produce different wall sleeves, and wherein different assemblies can be connected to one another in an arbitrary sequence.

2. The wall sleeve system according to claim 1, wherein the assemblies comprise a selection from the following list: at least one shutter assembly, at least one housing assembly, at least one flap assembly, at least one filter assembly, at least one electrical assembly, at least one insulation assembly, at least one blocking assembly, at least one installation aid assembly, at least one cover assembly, at least one connection assembly and at least one adapter assembly.

3. The wall sleeve system according to claim 1, wherein it comprises at least one housing assembly with a housing bounding an interior space with an inlet for an airstream, and an outlet for an airstream, wherein a flow region connects the inlet and the outlet in a flow direction, wherein for an area A of a cross section of the interior space perpendicular to the flow direction, the following applies
A/K>2/, wherein K indicates an area of an enveloping circle with the smallest possible radius that completely covers the cross section of the interior space.

4. The wall sleeve system according to claim 1, wherein it comprises at least one flap assembly with at least one flap arrangement with a flap arranged on a suspension, wherein the flap of the at least one flap arrangement can be swivelled about a swivel axis defined by the suspension between a closed position tightly closing a flow region and an open position, wherein the flap of the at least one flap arrangement at least in the open position has a flap contour which, in the regions adjacent to the swivel axis, is matched to the cross-sectional contour of the interior space in the respective regions adjacent to the swivel axis.

5. The wall sleeve system according to claim 4, wherein, in the open position, the flap of the at least one flap arrangement is in surface-to-surface contact with a housing of the flap assembly at least in sections in the regions adjacent to the swivel axis.

6. The wall sleeve system according to claim 1, wherein it comprises at least one flap assembly with two adjacent flap arrangements, wherein a spacing of the swivel axes of the adjacent flap arrangements is at least so large that the flaps in the open position do not have an overlap in the flow direction.

7. The wall sleeve system according to claim 1, wherein at least two flap assemblies can be arranged behind one another in the flow direction.

8. The wall sleeve system according to claim 1, wherein it comprises at least one flap assembly with at least one flap, wherein the flap comprises an insulation layer.

9. The wall sleeve system according to claim 1, wherein it comprises a selection of one or more housing assemblies and one or more flap assemblies, which can be connected to one another in an arbitrary sequence.

10. The wall sleeve system according to claim 1, wherein the assemblies comprise latching elements for mutual latching.

11. The wall sleeve system according to claim 1, wherein the assemblies each comprise at least one symmetry-breaking element in a latching section

12. The wall sleeve system according to claim 1, wherein different assemblies can be connected to one another in each case in a flow-tight manner.

13. The wall sleeve comprising at least one assembly from the wall sleeve system according to claim 1.

14. A ventilation system with a wall sleeve according to claim 13.

15. An arrangement of a wall sleeve according to claim 13 in an external wall of a building.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0086] FIG. 1 shows a diagrammatic representation of a ventilation system with a wall sleeve arranged in an external wall,

[0087] FIG. 2 shows a perspective view of an exemplary embodiment of a wall sleeve, wherein flaps of the wall sleeve are represented in a closed position,

[0088] FIG. 3 shows a cross section through the wall sleeve according to FIG. 2,

[0089] FIG. 4 shows a horizontal longitudinal section through the wall sleeve along an intersecting edge IV-IV in FIG. 3,

[0090] FIG. 5 shows a vertical longitudinal section through the wall sleeve along an intersecting edge V-V in FIG. 3,

[0091] FIG. 6 shows a perspective view of the wall sleeve according to FIG. 2, wherein the flaps are represented in an open position,

[0092] FIG. 7 shows a cross section through the wall sleeve according to FIG. 6,

[0093] FIG. 8 shows a side view of the wall sleeve according to FIG. 6,

[0094] FIG. 9 shows a vertical longitudinal section through the wall sleeve along an intersecting edge IX-IX in FIG. 7,

[0095] FIG. 10 shows a perspective view of a flap for the wall sleeve according to FIGS. 2 to 9,

[0096] FIG. 11 shows a side view of a variant of a wall sleeve,

[0097] FIG. 12 shows a perspective view of the wall sleeve according to FIG. 11,

[0098] FIG. 13 shows a further variant of a wall sleeve,

[0099] FIG. 14 shows an exploded representation of the wall sleeve according to FIG. 11,

[0100] FIG. 15 shows a detail representation of a magnetic closure device for a wall sleeve,

[0101] FIG. 16 shows a further detail representation of the wall sleeve according to FIG. 11 and

[0102] FIG. 17 shows a variant of the wall sleeve according to FIG. 11 with a cover assembly.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0103] FIG. 1 shows diagrammatically a ventilation system 1. Ventilation system 1 is used to ventilate a living room 2 of a building in an environment 3 surrounding the building. For this purpose, ventilation system 1 comprises a wall sleeve 5 arranged in an external wall 4 of the building.

[0104] Living room 2 can for example be a kitchen or a kitchen-living room. Ventilation system 1 is an extractor fan system for extracting cooking fumes. It comprises an inlet opening 6 for the cooking fumes to be extracted. Inlet opening 6 is constituted as a draw-down extractor, which is also referred to as a hob extractor. Inlet opening 6 is in a fluidic connection with ventilator 7. Ventilator 7 generates the airstream required to extract the cooking fumes. Ventilator 7 is constituted as a ventilating fan, in particular as a radial fan. A ventilation pipe 8 is arranged connected to ventilator 7. Ventilation pipe 8 provides a fluidic connection between ventilator 7 and wall sleeve 5. The air sucked out of living room 2 through inlet opening 6 with the aid of ventilator 7 and the cooking fumes contained therein are conveyed via ventilation pipe 8 and wall sleeve 5 into surroundings 3.

[0105] Making reference to FIGS. 2 to 17, variants of wall sleeve 5 are described below in detail. As will be explained below in greater detail, the wall sleeve can be composed in particular of assemblies and/or components of a modular wall sleeve system. This enables great flexibility. In particular, the features and properties of the variants described below can essentially be combined freely with one another. When mention is made below of wall sleeve 5, this is to be understood in each case to mean that the latter is formed from one or more elements or assemblies of the wall sleeve system.

[0106] Wall sleeve 5 comprises a housing 10 bounding an interior space 9. Housing 10 comprises an inlet 11 for an airstream and an outlet 12 for an airstream. A connecting socket 13 is arranged in the region of inlet 11. By means of connecting socket 13, ventilation pipe 8 is connected fluid-tight to wall sleeve 5. Connecting socket 13 is connected detachably to housing 10, so that different connecting sockets 13 can be connected to the wall sleeve depending on the design of ventilation pipe 8. Connecting socket 13 is used as an adapter for connecting ventilation pipe 8.

[0107] In the exemplary embodiment represented, the connecting socket is designed for a ventilation pipe 8 constituted as a round pipe with an inner diameter of 150 mm and an outer diameter of 155 mm. A diameter 14 and cross section of inlet 11 (see FIG. 4, 5, 7 or 9) correspond to the diameter and respectively the cross section of ventilation pipe 8. Diameter 14 of inlet 11 thus amounts to 150 mm. Inlet 11 has a circular cross section. Housing 10 is essentially circular cylinder-shaped. It has a maximum outer diameter of 170 mm.

[0108] Housing 10 is made of a heat-resistant plastic. It has a constant wall thickness between 0.1 mm and 10 mm, in particular of approximately 2.5 mm. On account of the constant wall thickness, interior space 9 also has the shape of a regular cylinder with a circular cross section. A cross section contour 16 of interior space 9 thus corresponds to the circumferential line of a circle with cross section diameter 17 (see FIG. 7). Area A of the cross section of interior space 9 thus corresponds to the area of the circle with diameter 17 and circle circumference 16. By means of this design of interior space 9, optimum use of the space occupied by the wall sleeve inside the masonry of external wall 4 is created. In particular, the cross section of interior space 9 is maximized with respect to the external dimensions of wall sleeve 5, in particular its outer diameter.

[0109] In an alternative not represented, protrusions are formed at the inner side of housing 10, against which flaps 23 lie in their closed position. The closed position is precisely defined by the protrusions. In addition, the insulation in the closed position of flaps 23 is again improved by means of the protrusions, in particular by means of sealing lips arranged on the protrusions or flaps 23. The protrusions can be designed in the form of solid material or in the form of an undercut. Alternatively, flaps 23 can be mounted in a swivellable manner in the region of a widened cross section of interior space 9.

[0110] In the arrangement, shown in FIG. 1, of wall sleeve 5 in external wall 4 of the building inlet 11 with connecting socket 13 is arranged on an inner side of external wall 4 facing living room 2 and outlet 12 is arranged on an outer side of external wall 4 facing surroundings 3. With the intended installation, wall sleeve 5 is orientated horizontally. This means that a central axis of circular-cylindrical housing 10 runs parallel to surface normal 15 of external wall 4. On account of circular-cylindrically constituted housing 10 of wall sleeve 5, its arrangement in the masonry of external wall 4 is simplified. A wall breakthrough required for insertion of wall sleeve 5 into external wall 4 can be made in a straightforward manner by core hole drilling with a circular drilling cross section. The diameter of the drilled core hole can be matched to the outer diameter of wall sleeve 5. The provision of a square wall breakthrough or partially overlapping drilled core holes, such as is required for the insertion of a, for example, square wall sleeve, is avoided. Particularly preferably, wall sleeve 5 is arranged in a drilled core hole having a larger diameter. An insulating material is then arranged in the intermediate space between wall sleeve 5 and the inner diameter of the drilled core hole. The formation of a heat bridge between wall sleeve 5 and the masonry of external wall 4 is prevented by the insulation material. This makes for good thermal insulation of wall sleeve 5.

[0111] A flow region 18 is defined inside interior space 9 of wall sleeve 5. Flow region 18 connects inlet 11 to outlet 12 in flow direction 19 (see FIG. 4, 5, 7 or 9). Flow direction 19 is defined as the shortest connection from inlet 11 to outlet 12. With interior space 9 constituted as a regular cylinder, flow direction 19 lies perpendicular on the cross-sectional area of inlet 11 and the cross-sectional area of outlet 12. With the intended horizontal installation of wall sleeve 5, flow direction 19 is orientated horizontally. Flow direction 19 is thus parallel both to the central axis of cylindrical housing 10 and also to surface normal 15 of external wall 4.

[0112] Wall sleeve 5 can also advantageously be installed inclined by a few degrees to the horizontal. In particular, it is possible to install wall sleeve 5 in such a way that the lowest boundary of interior space 9 in the direction from inlet 11 to outlet 12 is inclined to the horizontal. The inclination preferably lies in the range from 1 to 10. In particular, it can amount to at least 2, in particular at least 3. It can thus be ensured that fluid possibly collecting undesirably in interior space 9 does not penetrate into the building, but runs away to the exterior.

[0113] Flow region 18 is defined as the volume which is spanned by the length of wall sleeve 5 in flow direction 19 and the cross-sectional area of inlet 11. Flow region 18 is therefore a cylindrical volume with a cross-sectional area corresponding to the cross-sectional area of the inlet. The cross-sectional area of flow region 18 thus also corresponds to the cross-sectional area of ventilation pipe 8. Turbulence is thus effectively prevented.

[0114] Furthermore, wall sleeve 5 comprises an inlet-side flap arrangement 20 and an outlet-side flap arrangement 21. Flap arrangements 20, 21 are designed identically. They each comprise precisely one flap 23 arranged on a suspension 22.

[0115] Flaps 23 are in one piece and dimensionally stable. They each comprise a flap base body of plastic not shown explicitly. In addition, flaps 23 each comprise an insulation layer not represented explicitly. The insulation layer is glued on the flap base body as an insulating material, for example foam or expanded polystyrene, on the side of flaps 23 facing the flow, i.e. in their closed position on the side facing inlet 11. In alternatives not represented, the insulation layer is integrated into flaps 23. In further alternatives of flaps 23 not represented, the insulation layer can also be implemented as a vacuum or air inclusion inside flaps 23. Then again, in other alternatives flaps 23 themselves are produced from insulating material. In several alternatives, flaps 23 each comprise a peripheral sealing lip. The sealing lip is injection moulded as a soft component on the flap base body. The flap base body is a two-component part.

[0116] Suspensions 22 are implemented as capsule-pin suspensions. Capsules 24 are constituted as drill-holes in housing 10. Pins 25 are formed integrally with flaps 23 (see in particular FIG. 10). Pins 25 and capsules 24 are mirror-polished, as a result of which friction between pins 25 and capsules 24 is reduced. Suspensions 22 enable straightforward swivelling of flaps 23 about a swivel axis 26 defined by respective suspension 22. Swivel axes 26 are arranged perpendicular to flow direction 19 and above flow region 18.

[0117] Flaps 23 each have a longitudinal direction 27. Longitudinal direction 27 is defined as the direction perpendicular to swivel axis 26 in which the flap has the greatest extension. Longitudinal direction 27 runs perpendicular to swivel axis 26 irrespective of a swivelling position of respective flap 23. The plane spanned by swivel axis 26 and longitudinal direction 27 specifies an orientation of flap 23. The orientation of flap 23 changes when flap 23 is swivelled about swivel axis 26.

[0118] In addition, flaps 23 have a contour direction 28. Contour direction 28 runs perpendicular to swivel axis 26 and to longitudinal direction 27. Swivel axis 26, longitudinal direction 27 and contour direction 28 span an orthogonal coordinate system, with respect to which the contour and shape of flaps 23 is fixed. This coordinate system is fixed with respect to respective flap 23 and is swivelled with flap 23. Swivel axis 26 runs horizontally with the intended installation of wall sleeve 5.

[0119] Flaps 23 have a flap contour 29, which is essentially determined by the extension of flap 23 in the directions defined by swivel axis 26, longitudinal direction 27 and contour direction 28. Flap contour 29 is described in detail below in connection with the swivelling capability of flaps 23.

[0120] Flaps 23 can be swivelled about swivel axis 26 between a closed position shown in FIGS. 2 to 5 and an open position shown in FIGS. 6 to 9.

[0121] In the closed position, an orientation of flaps 30 is essentially parallel to the cross-sectional area of inlet 11 or of outlet 12. In the closed position, flaps preferably have an inclination of less than 5 to the cross-sectional area of inlet 11, in particular less than 5 to a vertical plane. They can have an inclination of at least 1, in particular 2 to the cross-sectional area of inlet 11, in particular to a vertical plane. With the intended horizontal installation of wall sleeve 5 in external wall 4, longitudinal direction 27 of flaps 23 in the closed position essentially runs parallel to a direction of the force of gravity. Contour direction 28 of flaps 23 in the closed position runs parallel to flow direction 19.

[0122] In the closed position, flaps 23 close the entirety of interior space 9 and therefore flow region 18 in a gas-tight manner. In the closed position of flaps 23, a fluidic connection between inlet 11 and outlet 12 is interrupted. In particular, it is thus ensured that an airstream cannot flow from outlet 12 in the direction of inlet 11. The penetration of ambient air into living room 2 is consequently prevented in the closed position of flaps 23. In the closed position, an air cushion 30 is created between flap arrangements 20, 21 (see FIGS. 4 and 5).

[0123] Swivel axes 26 of flap arrangements 20, 21 have a spacing 34 in flow direction 19 which is greater than a maximum extension of flaps 23 in longitudinal direction 27 (see FIGS. 5, 8 and 9). On account of the interrupted air exchange, an air cushion 30 arises between flap arrangements 20, 21 in the closed position of flaps 23, the extension of which air cushion essentially corresponds to spacing 34 of swivel axes 26 of flap arrangements 20, 21 in flow direction 19. Air cushion 30 produces a straightforward and reliable insulation between inlet 11 and outlet 12 of wall sleeve 5. Thermal insulation as well as sound insulation is thus ensured between the inside and outside of external wall 4 of the building. The insulation of wall sleeve 5 is brought about in the closed position by the insulation layer of flaps 23 and air cushion 30.

[0124] In the open position, flaps 23 are swivelled into flow direction 19. In the open position, the orientation of flaps 23 is perpendicular to a direction of the force of gravity. This means that longitudinal direction 27 of flaps 23 runs parallel to flow direction 19. Accordingly, contour direction 28 is parallel to the direction of the force of gravity.

[0125] In the open position, flaps 23 are swivelled in such a way that a fluidic connection is created between inlet 11 and outlet 12. In the open position of flaps 23, an airstream 33 (see FIG. 9) can flow from inlet 11 along flow direction 19 via flow region 18 to outlet 12. Airstream 33 essentially flows inside flow region 18. Flaps 23 in the open position open up the flow region essentially completely. Flap arrangements 20, 21 and their respective flaps 23 are swivelled out of flow region 18 and do not create any flow resistance against airstream 33 flowing in the direction of flow direction 19 from inlet 11 to outlet 12. On account of spacing 34 of swivel axes 26 of flap arrangements 20, 21, it is ensured that flaps 23 do not overlap in the open position. Interlocking of flaps 23 during swivelling out of the closed position into the open position or out of the open position into the closed position is prevented. In particular, outlet-side flap arrangement 21 does not prevent complete swivelling of inlet-side flap arrangement 21.

[0126] Flap contour 29 enables swivelling of flaps 23 constituted in one piece out of flow region 18 and at the same time a gas-tight closure of interior space 9 in the closed position. For this purpose, flap contour 29 is matched to cross-sectional contour 16 of interior space 9. This may be achieved by the fact that the maximum extension of flaps 23 both in longitudinal direction 27 and in a direction parallel to swivel axis 26 is matched in each case to cross-sectional diameter 17 of interior space 9. In addition, a projection of flap contour 29 onto a plane formed from swivel axis 26 and longitudinal direction 27 has a circular shape (see FIG. 3). In the closed position, flap contour 29 lies along entire cross-sectional contour 16 of interior space 9 flush against housing 10. The closed position is thus precisely defined and rattling of flaps 23 in the closed position is prevented.

[0127] In addition, flap contour 29 extends along contour direction 28 in regions adjacent to swivel axis 26. In these regions adjacent to swivel axis 26, flap contour 29 is matched along contour direction 28 with cross-sectional contour 16 of the interior space in the corresponding regions adjacent to swivel axis 26. This may be achieved by the fact that flaps 23 each comprise two contour wings 31. Contour wings 31 are arranged in the direction of swivel axis 26 at the side of pins 25. In a plane spanned by swivel axis 26 and contour direction 28, contour wings 31 have the shape of circular arc segments (see FIGS. 4 and 7). The radius of the circular arcs described by contour wings 31 is dimensioned such that contour wings 31 in the open position lie flush against regions of housing 10 adjacent to swivel axis 26. This means that the radius of the circular arcs described by contour wings 31 essentially corresponds to the radius of cross-sectional contour 16. Housing 10 forms a stop for contour wings 31 and therefore for flaps 23 in the open position. The open position of flaps 23 is thus precisely fixed. Fluttering and/or rattling of flaps 23 in the open position is prevented. Contour wings 31 have an extension in contour direction 28 which is greater than 40% of the maximum extension of flaps 23 in longitudinal direction 27.

[0128] A mechanical stop is preferably provided in the axis seating, which prevents flaps 23 from striking against housing 10.

[0129] In addition, flaps 23 comprise peripheral contour edges 32 (see FIGS. 6, 8 and 10). Contour edges 32 are rounded off in such a way that friction-free swivelling of flaps 23 from the closed position into the open position and back is ensured.

[0130] In the closed position shown in FIGS. 2 to 5, flap 23 of outlet-side flap arrangement 21 is arranged completely inside interior space 9, i.e. completely inside housing 10. In the open position shown in FIGS. 6 to 9, flap 23 of outside flap arrangement 21 projects beyond outlet 12 of housing 10. By means of flap 23 of outside flap arrangement 21, a roof shielding outlet 12 is thus formed in the open position. This thus prevents rainwater from being able to penetrate into interior space 9 of wall sleeve 5 via outlet 12 even in the open position of flaps 23.

[0131] The mechanism for swivelling flaps 23 is described below. Flaps 23 swivel in a purely passive manner. No electric motors and other active actuation mechanisms are thus provided for the swivelling of flaps 23. Flaps 23 swivel solely as a result of airstream 33 generated by ventilator 7. Flaps 23 are always in the closed position when no airstream 33 flows or a flow pressure of airstream 33 is less than a predetermined opening pressure. As soon as the flow pressure of airstream 33 exceeds the predetermined opening pressure, flaps 23 swivel out of the closed position into the open position. If the flow pressure of airstream 33 falls below the opening pressure, airstream 33 completely ebbs away or no airstream at all flows against flow direction 19, the flaps swivelling out of the open position into the closed position purely in a passive manner on account of the force of gravity. Flaps 23 have the function of a non-return valve, so that an airstream from outlet 12 to inlet 11 causes flaps 23 to close. An airstream against flow direction 19 is not therefore possible.

[0132] A practicable opening pressure lies between 15 Pa and 90 Pa, in particular between 50 Pa and 60 Pa. This ensures that unintentional opening of flaps 23 is prevented. At the same time, overloading of ventilator 7 is prevented.

[0133] The swivelling capability of flaps 23 is ensured by their small inherent weight and the small amount of friction produced by mirror-polished capsule-pin suspension 22. This enables swivelling of flaps 23 with a small torque. In addition, it is ensured that flaps 23 are swivelled from the closed position completely into the open position even with a flow pressure of airstream 33 which only slightly exceeds the opening pressure.

[0134] In further alternatives of the wall sleeve, swivelling of the flaps can moreover be assisted by counterbalancing of flaps 23 with respect to swivel axes 26. The counterbalancing of flaps 23 takes place in such a way that a centre of gravity of flaps 23 comprises a cantilever arm with respect to respective swivel axis 26, which amounts at most to 25%, in particular at most to 10%, in particular at most to 1% of an extension of flaps 23 measured along longitudinal direction 27. This can be brought about for example in that counterweights are provided above suspensions 22.

[0135] In further alternatives of the wall sleeve that are not represented, the housing has the shape of a regular cylinder with a non-circular base area. For example, the base area is a regular polygon with 5 or more corners. The base area can in particular be formed so as to be hexagonal or octagonal. Oval base areas or polygons with rounded edges and corners can also be implemented. The housing can also have a cross section that varies along the flow direction. In all alternatives, however, the following applies to area A of the cross section of the interior space perpendicular to the flow direction:

A/K>2/,

wherein K indicates an area of an enveloping circle with the smallest possible radius that covers the cross section of the interior space completely.

[0136] In further alternatives not represented, the flaps are flexible at least in the region of the contour wings. This means that the flaps in the closed position can be plate-shaped and in the open position can be deformed by lying against the housing, so that the flap contour is matched to the cross-sectional contour. Then again, in other alternatives contour wings are connected in an articulated manner to the rest of the flap.

[0137] Further features of wall sleeve 5, in particular its modular structure, are explained in further detail below.

[0138] As already mentioned, wall sleeve 5 is composed of components of a wall sleeve system. In particular, it comprises one or more assemblies constituted in a modular manner. This leads to great flexibility. The modular embodiment of wall sleeve 5 in particular makes it possible to adapt its details flexibly to different circumstances and/or specifications.

[0139] For example, housing 10 can be constituted as a housing assembly. In this case, it need not comprise any flaps 23. A flap assembly, on the other hand, comprises a housing 10 with one or more flap arrangements 20, 21 with one or more flaps 23.

[0140] As indicated by way of example in FIGS. 2 to 5, the variants represented in these figures can be constituted as flap assemblies with two flaps 23. They can also be formed from two flap assemblies with in each case one flap 23.

[0141] The number of latching elements 35 in particular amounts to 8. In general, it can amount to at least 2, in particular at least 3, in particular at least 4, in particular at least 6.

[0142] Connecting socket 13 is a component of a connection assembly. It can also be used as an adapter assembly for the connection of a ventilation pipe 8 which has a different flow cross section, in particular a different diameter from wall sleeve 5.

[0143] In FIGS. 11 to 17, further variants of different assemblies of the wall sleeve system and different possible combinations thereof are represented by way of example. The modular structure of wall sleeve 5 emerges particularly clearly from these figures.

[0144] The different assemblies comprise latching elements, by means of which they can be latched together. Latching elements 35 can be arranged in particular so as to be distributed equidistantly over the periphery of the different assemblies.

[0145] In particular, wall sleeves 5 with different installation lengths can be produced by a targeted selection of one or more different assemblies. The minimum installation length is essentially limited only by the extension of flap 23 in flow direction 19. It can lie in the range from 3 cm to 5 cm. Installation lengths in the range from 10 cm to 30 cm are more common, in particular in the range from 14 cm to 25 cm. Larger installation lengths can be provided essentially in an arbitrary manner by adding further assembly modules.

[0146] In order to ensure that adjacent assemblies are connected to one another in a predetermined relative orientation with respect to one another, symmetry-breaking means, for example in the form of a web 36 and a groove 37 matching the latter (see FIG. 16), can be arranged in the latching regions.

[0147] The assemblies can in particular be constructed according to the poka yoke principle.

[0148] The stipulation of a discrete number of connection options between the different assemblies, in particular of a single, definite connection option between two assemblies in each case, can also be achieved by a non-equidistant distribution of latching elements 35 over the periphery of the assemblies.

[0149] As is represented in FIGS. 11 to 14, wall sleeve 5 can also comprise a shutter 38 as a shutter assembly.

[0150] The shutter assembly can be constituted as a sandwich component. It can in particular comprise a plastic panel 39 as a support. Moreover, it can comprise a stainless steel panel 40 as a privacy screen.

[0151] The shutter assembly can be connected, in particular latched, to a housing assembly or a flap assembly. It can in particular be fitted onto a housing 10 of a housing assembly or of a flap assembly and fixed there, in particular detachably, by means of a plurality of toothed latches.

[0152] The variant of wall sleeve 5 represented in FIGS. 11 and 12 comprises 4 assemblies: a connection assembly, two differently constituted flap assemblies and a shutter assembly.

[0153] The wall sleeve represented in FIG. 13 comprises only 3 assemblies. In this variant, the flap assembly provided between the connection assembly and the outer flap assembly according to the variant according to FIGS. 11 and 12 has been dispensed with. The variant of wall sleeve 5 represented in FIG. 13 is thus particularly well suited for walls with smaller wall thicknesses. The variant of wall sleeve 5 represented in FIGS. 11 and 12 is particularly well suited for external walls with larger wall thicknesses. Moreover, on account of the plurality of flap assemblies, it leads to particularly good thermal properties, in particular to a particularly low heat transmission coefficient (U-value).

[0154] The wall sleeve system can comprise different assemblies with different outer diameters. In particular, this makes it possible to adapt wall sleeve 5 flexibly to breakthroughs which possibly are already present, in particular drilled core holes, in external wall 4 of a building. The outer diameter of the wall sleeve or of the different assemblies thereof lies in particular in the range from 3 cm to 50 cm, in particular in the range from 5 cm to 30 cm, in particular in the range from 10 cm to 25 cm. It can lie in particular in the range from 15 cm to 18 cm.

[0155] Depending on whether insulation is present or not at the periphery to interior space 9, i.e. between interior space 9 and external wall 4, the diameter, in particular the minimum diameter, of the opening, in particular of the drilled core hole, in which wall sleeve 5 is mounted, is matched to the outer diameter of wall sleeve 5. If an opening is already present in the external wall for the mounting of wall sleeve 5, the outer diameter of wall sleeve 5 can of course conversely also be matched to the diameter, in particular the minimum diameter, i.e. the minimum free width, of an opening already present in external wall 4.

[0156] In particular, one or more insulation assemblies can be provided for the insulation of wall sleeve 5. The insulation assemblies, can be adapted in particular to the assemblies to be insulated in each case in particular to their external shape.

[0157] One or more sealing means can be provided for the sealing of the connection of two assemblies. In particular, EPDM seals and/or sealing cords can be used as sealing means 43. The dimensions of the latter are adapted in particular to the geometrical details of the assemblies to be connected in each case.

[0158] Moreover, a sealing cord 41 is represented in FIG. 14, which is arranged on the rear side of shutter 39. In the assembled state of the shutter assembly, sealing cord 41 is pressed by shutter 38 onto external wall 4.

[0159] As can be seen from FIG. 14, different housing assemblies can each comprise devices for seating a flap arrangement, in particular a flap 23. Such housing assemblies can be transformed flexibly into flap assemblies by the arrangement of a flap 23. Accordingly, flap assemblies can be transformed into housing assemblies by removal of flaps 23.

[0160] It is of course also possible to constitute the housing assemblies more simply in terms of design, in particular without a seating for a suspension 22 of a flap 23.

[0161] The flap assemblies in particular each comprise a housing 10, one or more flaps 23 and the components for the swivellable suspension of flaps 23. Moreover, they can comprise a flap seal 42, for example in the form of a sealing ring or a sealing cord.

[0162] The flaps can have a sandwich design. They can in particular comprise actual flap 23 and a flap insulation 44. The flap insulation can for example be made of polystyrene (BPS, expanded polystyrene) or another insulation material. Flap insulation 44 is matched in its shape to the contour of flap 23. It can in particular be fixedly connected to flap 23, for example it can be glued to the latter. For the purpose of simplification, the term flap is understood to mean both a combination of flap 23 and flap insulation 44 as well as a flap 23 without flap insulation 44.

[0163] Flap 23 can be constituted so as to be dimensionally elastic. It can in particular be compressed for the arrangement in housing 10 or for removal from housing 10, in particular compressed single-handedly. The spacing, in particular the axial spacing, between the two pins 25 is thereby reduced. This enables a straightforward, in particular tool-less, arrangement and removal of pins 25 from suspension 22.

[0164] FIG. 15 represents by way of example a closure mechanism 45 for a flap arrangement with a variably adjustable opening pressure. Closure mechanism comprises a magnet 46 and a ferromagnetic element 47 interacting with the latter.

[0165] Magnet 46 can in particular be a permanent magnet.

[0166] Ferromagnetic element 47 can in particular be a threaded pin. The threaded pin can be screwed into a thread 48 in flap 23. The spacing between the threaded pin and magnet 46 can thus be changed. This makes it possible to adjust the force exerted by magnet 46 on the threaded pin and therefore the closing force or opening pressure of flap 23.

[0167] In principle, an electromagnet can also be provided instead of a permanent magnet. In this case, the magnetic force can also be influenced by the current for generating the magnetic field.

[0168] In the variant represented in FIG. 15, magnet 46 and threaded pin 47 are spaced apart from one another in the radial direction, i.e. perpendicular to flow direction 19. According to an alternative, magnet 46 and ferromagnetic element 47 are spaced apart from one another in the axial direction, i.e. in flow direction 19.

[0169] The assemblies can each comprise elements, for example in the form of webs 49, which are used as installation aids. Webs 49, particularly when viewed from the front, can be arranged in a 3 o'clock position and/or a 9 o'clock position. They can be used to support a spirit level during the assembly of wall sleeve 5. They facilitate the precise assembly of wall sleeve 5.

[0170] Webs 49 can also be used as stiffening elements for stiffening housing 10.

[0171] By selecting and/or fitting together one or more assemblies with a total of at least two flaps 23, which are arranged behind one another in flow direction 19, wall sleeve 5 can be constituted as a 3- or multi-chamber system. Wall sleeve 5 can in particular be constituted with at least two heat-insulated flaps 23 and at least one vertical air column in the region between two flaps 23. A particularly low heat transmission coefficient (U-value), i.e. particularly advantageous thermal insulation, is thus possible.

[0172] FIG. 17 represents by way of example a cover assembly with a cover 50. Cover 50 can be fitted on the outlet side onto housing 10, in particular of a housing assembly or flap assembly. Accordingly, it is possible to provide a cover for inlet-side fitting on one of the assemblies.

[0173] Cover 50 is used for the protection of wall sleeve 5 during the shell construction phase. It is used in particular for the protection of wall sleeve 5 during plastering or painting work. In particular, it prevents wall sleeve 5 getting dirty during the construction phase. Cover 50 can be removed, in particular pulled off, after completion of the construction phase. For this purpose, it comprises a shaped element 51 that can be pressed out or a flap. Shaped element 51 can be attached to cover 50 by thin webs.

[0174] After completion of the construction work, the cover assembly can be replaced in particular by a shutter assembly.

[0175] A web 52 is arranged on cover 50. Web 52 is used as an assembly aid, in particular for supporting a spirit level.