EP4015931A1 - Wall feedthrough unit for the connection of a domestic technology device - Google Patents

Abstract

A wall bushing unit (100) for connection to a domestic appliance, comprising: - a wall bushing element (100) with a flow channel (120), which includes a flow channel inner section (121) and a flow channel outer section (122), - an outer wall grille (210 ) with an inner frame with at least two parallel inner frame parts on the side, between which several slats are arranged, and with a blind frame, the back of which forms a mirror surface for contact with a wall connection level. The wall lead-through element (100) and the outer wall grille (210) are connected via a holding frame (230 ) connected with each other. The holding frame (230) can be fastened in the area of an outer face (130) of the wall lead-through element (100) to be arranged on the outside of the building. At least two holding frame fastening tabs (232) extend into the flow channel (120). The lateral frame parts (221) of the outer wall grille (210) at least partially overlap with the holding frame fastening straps (232), with at least one fastening means for connecting the outer wall grille (210) to the holding frame (230) being arranged in the overlapping area.

Description

The invention relates to a wall bushing unit for connecting a domestic appliance, having the features of the preamble of claim 1.

Household technology devices, in particular heat pumps, multifunctional devices according to DIN EN 16573 or central ventilation devices that are set up inside buildings, require a wall duct to the outside through which the required supply air can be supplied and the exhaust air can be discharged. For this purpose, at least one end of an air line is provided on the heat pump or the central ventilation unit and the other end is attached to a wall duct.

A depth-adjustable wall bushing unit is from the DE 10 2017 002 396 A1 known. An outdoor part is attached from the outside of the building and an indoor part from the inside of the building. The outdoor part also includes an outer wall grille and a small animal protection grille. The flow channel is formed within two mutually telescoping pipe sockets, which are mutually displaceable in order to be able to adapt to the individual wall thickness of a building wall. When building prefabricated houses, however, the wall thickness is known within narrow tolerance ranges, so that it is not necessary to adjust the depth of the flow channel. The use of the known wall bushing unit then has the disadvantage that that a not inconsiderable proportion of the cross section of the wall opening is blocked for the air flow by the length adjustment that is not required. A large wall opening must therefore be created for a specific required volume flow so that the flow cross-section in the WDE is sufficiently large. In addition, when building prefabricated houses, there are high requirements for protection against the ingress of water, in particular against water that runs behind a damaged sealing layer or penetrates through driving rain. Furthermore, the installation of a known wall bushing unit requires a lot of assembly time in order to carefully seal all joints.

It is therefore the object of the present invention to provide a wall duct for connecting a building services appliance which enables reliable sealing and simple and convenient installation in building walls, in particular in prefabricated components of prefabricated houses.

This problem is solved by a wall bushing unit with the features of claim 1 . Advantageous embodiments of the invention are specified in the dependent claims.

Domestic technology devices that suck in air from the outside of a building or expel it there are, in particular, a heat pump that can be installed inside, multifunctional devices according to DIN EN 16573 or a ventilation device.

Due to the three-part design of the wall bushing unit, particularly simple assembly is possible. In addition, the construction of the wall bushing unit can be completed step by step as the construction of the associated part of the building progresses.

Due to the fact that the fastening points for the outer wall grille are positioned on those parts of the holding frame which extends into the flow channel, fastening means no longer need to be subsequently attached to the outside of the facade. Protective layers that have already been applied there remain as a result of the installation of the outer wall grid completely undamaged, while at the same time a simple attachment of the outer wall grille and also a permanent connection with the other parts of the wall bushing unit is ensured.

The outer wall grille is a finished unit, preferably formed from stainless steel or aluminum sheet. An inner frame extends a distance into the depth of the flow channel. The inner frame is surrounded by a blind frame. Several slanting slats are arranged inside the inner frame.

To assemble the wall bushing unit, a wall bushing element, which is in particular a cuboid body made of EPS plastic foam, is first inserted into a wall recess. In the case of prefabricated house construction, the wall recess can be formed from the outset by recesses in the walls, or they can be made in the wall later. The wall lead-through element is then inserted into the wall cutout and glued into it, for example, resulting in an airtight connection. The wall lead-through element closes flush both on the inside of the building and on the outside of the building.

In the following assembly step, the holding frame is put on. For this purpose, a holding frame outer element is provided that is preferably flush with the face of the wall lead-through element. The connection between the holding frame and the wall duct element is made by screws that engage in dowels that are either screwed into the hardened EPS plastic foam after foaming or that have been foamed directly into the wall duct element.

The wall bushing element and the holding frame can also be delivered as a fully assembled unit for use in finished parts of the building, since no adjustment work is required on the wall bushing element in this application.

The outer holding frame element can then be covered with reinforcement fabric and/or plastered on, resulting in a top wall layer in which the outer holding frame element is embedded. This means that water running off the wall of the building can only reach the plaster surface on the outside, but no longer into the space between the outer element of the holding frame and the face of the wall lead-through element.

In the case of the parts of the holding frame protruding into the flow channel, there are preferably also small animal protection grid fastening bottles, into which a small animal protection grid can be hung. Alternatively, a small animal protection grille can also be attached to the outer wall grille behind the slats. However, the connection to the holding frame has the advantage that the flow channel can already be closed off in a step-by-step assembly according to the respective construction progress without the outer wall grid having to be put on at an early stage. This advantage arises less in the construction of building parts for prefabricated houses, but above all in the subsequent installation of a wall lead-through element in a building wall.

After the wall surface on the outside of the building has been completely processed, the outer wall grid is put on in the last step. To do this, the outer wall grille only needs to be pushed into the area already specified by the holding frame. An inner frame of the outer wall grille is pushed between the fastening tabs of the holding frame. In those areas where the fastening lugs of the holding frame overlap with the fastening lugs of the outer wall grid, a form-fitting connection can be made, through which the outer wall grid is fastened to the holding frame and indirectly also to the wall lead-through element via this.

The attachment points are offset inwards from a wall connection level, i.e. within the flow channel. In particular, it is provided there, two screws per each on the holding frame fastening bottles Insert the fastening strap and provide elongated holes in the inner frame of the outer wall grille on the rear edge. As a result, the outer wall grille only needs to be pushed with its elongated holes under the screw heads on the previously installed holding frame. The screws are tightened, which attaches the outer wall grille firmly and securely. Slight tolerances in the plaster layer can be easily compensated for by designing the fastening recesses in the form of elongated holes. The screw connections are preferably each arranged in such a way that they are covered by the slats in the outer wall grille and are therefore generally not visible in a front view. The concealed screw connection in the flow channel also has the advantage that there are no miter cuts, rivets, etc. on the window frame that could be visually disturbing and through which water could penetrate.

A preferred embodiment also provides that at least one collecting surface is formed in the lower area of the flow channel outer section, which ends at a drip edge. The drip edge in turn protrudes beyond a lower flow channel surface. The lower flow channel surface is preferably designed to slope outwards. The fastening means for connecting the outer wall lattice to the holding frame are arranged above the collecting surface, as are the rear edges of the slats in the outer wall lattice. The small animal protection grille is also arranged above the collection surface in the flow channel. Water that penetrates through driving rain or that is sucked in during the supply air operation of the building services system can drip off at the points mentioned and thus reach the collecting surface and from there via further slats or dripping surfaces beyond the wall connection level to the outside.

For an optimized sealing and ventilation concept, a preferred embodiment of the wall duct unit according to the invention provides at least one additional lamella, which is glued or welded to the back of the upper cross bar of the frame, so that the additional lamella extends from a point outside the wall connection plane to the inside of the flow channel. The additional lamella thus supplements the inner frame in the manner of a cover. The additional lamella is advantageous for ventilation reasons in order to close off the flow channel at the top. With regard to the tightness of the outer wall grille, the additional slat has the dual function that any water penetrating from above in the wall connection level reaches the additional slat and is initially drained inwards via this. At the end of the additional slat, the water can drip onto the uppermost slat in the outer wall grille and thus get back outside beyond the wall connection level. With this labyrinth concept consisting of an additional slat and an upper slat, an aerodynamic closure upwards is achieved at the same time, but water permeability is also created.

Furthermore, the improved sealing concept in the wall duct unit according to the invention provides for the window frame to be backed with polyethylene foam sealing strips and for an additional swelling tape sealing strip to be provided on the back of the foam sealing strips that are to be assigned to the wall surface.

The ease of installation of the wall bushing unit according to the invention in prefabricated house construction results from the fact that the wall bushing element and the holding frame can already be fully installed in the factory when the part of the building is being manufactured. All the elements required for sealing and draining back water are integrated in the outer wall grille. With the prefabricated building, the only assembly step with regard to the wall duct unit is to put on the outer wall grid and secure it with the four screws already pre-positioned. No rework is necessary either on the outer wall grille or on the building itself. At the same time, it is impossible for seals to be omitted or incorrectly implemented due to carelessness.

In order to optimize the air flow in the flow channel, it is provided that the inner section of the flow channel is provided with a round, in particular a ellipsoidal cross section merges steadily into the flow channel inner section with the rectangular or polygonal cross section. This means that large offset areas that would be perpendicular to the direction of flow and generate turbulence are avoided at the transition.

In order to separate moisture sucked in during supply air operation as far as possible in the wall duct unit, it can be provided that parts of the flow duct are designed with at least one small offset step or in a stair-like manner with several small offset steps. In particular, this prevents the formation of a wall-adhering film of moisture that is sucked into the system. With a low offset height of in particular up to 5 mm, at most up to 10 mm, the main flow is not significantly impaired.

Furthermore, it can be provided that the central axis of the flow channel rises from the outside of the building to the inside of the building, to the extent that all areas of the inner wall in the flow channel have a gradient towards the outside.

The holding frame outer part can be designed as a frame made of sheet metal without recesses.

The small animal protection grid is preferably exchangeably held on the holding frame. This allows it to be removed for cleaning purposes. It can also be exchanged for a grid with a different mesh size, e.g. B. on buildings, where high humidity and low temperatures in winter can lead to icing on the small animal protection grid.

The small animal protection grid is also preferably formed as a stamped part made of sheet metal. A certain amount of reinforcement is achieved by embossed ribs and/or vertical or flanged outer edges. If the stamped part is bulbous, the convex side is aligned to the inside of the building, ie away from the outer wall grid, so that these parts do not touch.

Fig. 1

eine Wanddurchführungseinheit in einer perspektivischen Explosionsansicht, von einer Gebäudeaußenseite aus gesehen;

Fig. 2

ein Wanddurchführungselement und ein Halterahmen in einer perspektivischen Ansicht von der Gebäudeaußenseite her;

Fig. 3

das Wanddurchführungselement mit Schlauchadapter in perspektivischer Explosionsansicht;

Fig. 4

ein Wanddurchführungselement mit einem Schlauchadapter perspektivisch von hinten;

Fig. 5

ein Außenwandgitter in frontaler Ansicht von der Gebäudeaußenseite her;

Fig. 6

ein Außenwandgitter in frontaler Ansicht auf seine Rückseite;

Fig. 7

eine vergrößerte Detaildarstellung des linken oberen Eckenbereichs aus Fig. 6;

Fig. 8

das Außenwandgitter in seitlicher Schnittansicht;

Fig. 9

eine Detailansicht aus dem oberen Bereich von Figur 8;

Fig. 10

eine perspektivische Ansicht auf die Rückseite einer teilweise montierten Außenwandgitter-Einheit;

Fig. 11

eine perspektivische Ansicht auf die Außenwandgitter-Einheit von schräg oben;

Fig. 12

eine Verbindung eines Kleintierschutzgitters mit dem Halterahmen im Detail;

Fig. 13

die vollständig montierte Wanddurchführungseinheit in seitlicher Schnittansicht;

Fig. 14

ein Detail einer perspektivischen Schnittansicht der Wanddurchführungseinheit und

Fig. 15

eine weitere Ausführungsform einer Wanddurchführungseinheit in seitlicher Schnittansicht.

The invention is explained in more detail below with further advantageous refinements using the exemplary embodiment illustrated in the drawings. The figures show in detail:

1

a wall duct unit in an exploded perspective view seen from a building exterior;

2

a wall duct element and a holding frame in a perspective view from the outside of the building;

3

the wall bushing element with hose adapter in a perspective exploded view;

4

a wall lead-through element with a hose adapter in perspective from behind;

figure 5

an external wall lattice in a frontal view from the outside of the building;

6

an outer wall lattice in frontal view to its rear side;

7

an enlarged detail view of the upper left corner area 6 ;

8

the outer wall grille in a side sectional view;

9

a detailed view from the upper area of figure 8 ;

10

a perspective view of the rear of a partially assembled exterior wall grille unit;

11

a perspective view of the outer wall grille unit obliquely from above;

12

a connection of a small animal protection grid with the holding frame in detail;

13

the fully assembled wall bushing unit in a side sectional view;

14

a detail of a perspective sectional view of the wall bushing unit and

15

a further embodiment of a wall bushing unit in a side sectional view.

figure 1 FIG. 12 shows a wall duct unit 100 in an exploded perspective view seen from a building exterior. It essentially consists of three assemblies, namely an outer wall grille 210, a holding frame 230 and a wall duct element 110.

For assembly, the cuboid wall lead-through element 110 is inserted into a wall section of a building. The wall lead-through element 110 is made in particular from EPS foam, so that the heat conduction from the outside of the building to the inside of the building is interrupted. Inside the wall lead-through element 110 there is a flow channel 120 which is divided into a flow channel inner section 121 with a round cross section and a flow channel outer section 122 with a rectangular cross section. The cross sections 121, 122 continuously merge into one another; Offset surfaces perpendicular to the direction of flow are avoided. In the flow channel outer section 122, a shoulder is formed on the underside as a collecting surface 123, which is arranged above a lower flow channel surface 125, which slopes outwards at an angle, and which protrudes outwards beyond this.

The holding frame 230 consists of an outer holding frame element 231 which is perforated in the manner of a cleaning rail. Fastening tabs 232 extend perpendicularly thereto into the flow channel. Some of these reach even further in depth and form small animal protective grid attachment lugs 234. A small animal protective grid 235 is held on it.

The outer frame element 232 can be fastened to fastening bores 116 on an outer face 115 of the wall lead-through element 110 . Dowels are screwed in there to reinforce the mounting holes 116 .

During assembly, the last step is to place the outer wall grille 210 on the holding frame 230, with fastening recesses (not visible here) on the outer wall grille 210 engaging under the fastening screws 233, which are positioned in threads or bores on fastening lugs 232 of the holding frame 230.

Grooves 117 are formed in the side surfaces of the flow channel outer section 122 in order to accommodate protruding portions of the fastening screws 233 on the holding frame 230 . As a result, the fastening tabs 232 of the holding frame 210 can be positioned close to the lateral walls of the flow channel outer section.

figure 2 shows the addition of the outer wall grille 210 with the holding frame 230, as in 1 in a perspective view from the outside of the building. The holding frame outer element 231 rests against the front, outer face 115 of the wall lead-through element 110 . A small animal protection grid 235 is arranged above the collecting surface 123 in the flow channel. The collecting surface 123 is inclined slightly outwards and ends at a drip edge 124 above the lower flow channel surface 125.

figure 3 shows the wall lead-through element 110 in perspective from behind. i.e. seen from the inside of a building in a perspective exploded view, together with parts of a hose connection adapter 140.

A connecting piece 112 is formed on a rear side 111 of the wall lead-through element 110 . This has a hose holder 113, the diameter of which is slightly larger than the rear cross-section of the flow channel inner section 121, so that a stop edge for a Hose adapter 140 results carrying an air hose. The connecting piece 112 has a fastening hole 114 in each corner for receiving a dowel 145. Alternatively, the dowels 145 can be foamed into the wall lead-through element 110.

Like the wall duct element 110, the hose connection adapter 140 is made of EPS foam and includes a round hose connector 141, which engages in the hose receptacle 113 on the connector 112 of the wall duct element 110 and onto which the end of an air hose can be pulled. It has a rectangular collar 146 reinforced by a backing plate 142 of sheet metal or reinforced plastic.

Hanger bolts 143 are inserted into the dowels 142 in the fastening bores 114 on the wall bushing element 110 . As a result, the hose connection adapter 140 can be prepared by already attaching the air hose to the hose connector 141 before the hose connection adapter 140 is connected to the wall lead-through element 110 .

The hose connector 141 is inserted into the recess 113 to fasten the hose connection adapter 140 to the wall lead-through element 110 . At the same time, the collar 146 and the support plate 142, which contain bores for receiving the hanger bolts 143, are put on and secured via wing nuts or knurled nuts 144 placed on the hanger bolts 143.

figure 4 shows the wall lead-through element 110 with the hose connection adapter 140 placed on the connection piece 112 on the rear side 111 after its assembly.

In figure 5 the outer wall grille 210 is shown in a frontal view from the outside of the building. The outer wall grille 210 has a frame 216 which is intended to rest on the outside of the wall and which stands on a drip rail 229 . Forward, to the outside, has the Frame a front mirror surface 225. The drip molding 229 covers plaster and / or insulation layers below the wall duct element on which the outer wall grid 210 is placed.

The lattice structure of the outer wall lattice 210, which covers the flow channel in the wall lead-through element, consists of a plurality of lamellae 211, 213, 214, each of which slopes downwards towards the outside and which, in the projection onto the wall plane, overlap to such an extent that there are no open cross-sectional areas exist. This prevents driving rain from penetrating into the flow channel. When viewed from the outside, a top louver 211 and a plurality of middle louvers 213 appear the same. Only one lower slat 214 differs in that it protrudes outwards beyond the plane of the window frame 216 and also has lateral projections 215 .

In figure 6 the outer wall grille 210 is shown in a frontal view on its rear side. An inner frame 220 is provided within the frame 216, which is connected to the frame 216 and is aligned perpendicularly thereto. The inner frame 220 includes parallel lateral inner frame parts 221 between which the slats 211, 213, 214 are held.

The blind frame 216 has an inner mirror surface which is intended to rest on the outside of the building wall and is covered with at least one sealing strip 218 . In the exemplary embodiment of the outer wall grid 210 shown, all four partial mirror surfaces are covered with sealing strips 218 over their entire surface. These are PE foam sealing strips with miter cuts in the corner areas. Additional swelling tape sealing strips 217 are placed on the sealing strips 218 at the edges.

figure 7 is an enlarged detail view of the upper left corner area figure 6 . The lateral inner frame parts 221 have several punched out, in the z. B. lugs 211.1 of the upper lamella 211 are used.

The frame 216 consists of sheet metal, which is bent with its outer edge perpendicular to the mirror surface. As a result, a mirror surface limited on both sides for receiving the sealing strips 217, 218 is formed between the outer edge of the window frame 216 and the inner frame 220.

The swelling tape sealing strip 217 on the top runs across the entire width of the outer wall grid 210. If water running off the building facade in the corner area of the outer wall grid 210 is not already held back by the swelling tape sealing strip 217, it will follow in the miter plane between the sealing strips 218 directed below. It is important for this that the miter plane ends on the upper edge of the lateral inner frame parts 221 or is offset even further inwards, ie above the slats. This ensures that water is guided downwards along the lateral inner frame parts 221 and drips off there within the flow channel where the step is formed by the collecting surface 123 . However, water cannot run behind the sealing strips 217, 218 and run along the lateral sections of the window frame 216.

figure 8 shows a section through the center of the outer wall grille 210. The elongated holes open to the rear are clearly visible here, which are used for easy attachment of the outer wall grille 210 to the fastening screws 233 of the holding frame 230 (see figure 2 ) to serve.

The blind frame 216 is backed with sealing strips 218 . The swellable tape sealing strips 217, which are relatively thin in relation to the sealing strips 218, are also applied thereto. The rear surfaces of the sealing strips 217, 218 form a mirror surface 219 on the rear of the window frame 216, which is used to position the outer wall grille 210 on the outer wall surface of the building. which forms a wall connection level W, is determined.

A recess 224 is made in the lower area of each of the lateral inner frame parts 221 . The step in the flow channel protrudes into this after the wall bushing unit has been completely installed.

An important element for achieving security against water, which may run behind the swelling tape sealing strips 217, is an additional slat 212. This is located under the upper section of the window frame 216 and, unlike the other slats 211, 213, 214, for Flow channel sloping, i.e. towards the inside of the building.

An additional sealing strip 223 is provided on the outside of the lateral inner frame parts 221 in each case. Its meaning is referred to below figure 13 explained in more detail.

9 is a detail view from the top of figure 8 . The path of the water, which runs behind a possibly defective sealing line between the wall connection level W and the swelling tape sealing strip 217, is marked with the dotted line. It is safely guided away from the rear mirror surface 219 on the frame 216, which is synonymous with a wall connection level W, by means of the additional slat 212. This guides the water first over the wall connection level W into the interior of the flow channel. It can then drip onto the upper lamella 211 there. In order to force dripping, the lower edge of the lamella 211 is bent over. The lower edges of the other slats are also designed accordingly.

figure 10 is a perspective view of the rear of a complete outer wall grille unit 100. The outer wall grille 210 is combined here with the holding frame 230 and the small animal protection grille 235. FIG. The holding frame outer element 231 rests on the mirror surface of the window frame 216 of the outer wall grille 210 . Since the holding frame outer element 231 is placed on the wall surface and plastered, the runs Wall connection level W between the holding frame outer element 231 and the frame 216.

The inner frame 220 of the outer wall grid 210 extends into the opening in the outer support frame member 231 . As a result, the lateral inner frame parts 221 of the outer wall lattice 210 lie against the fastening lugs 232 of the holding frame 230 . A firm connection is established via the fastening screws 233 as soon as the outer wall grille 210 has been pushed onto the holding frame 230 previously installed together with the wall duct and possibly already plastered.

Two small animal protection grille fastening straps 234 are formed on the holding frame fastening straps 232 and extend beyond the rear edge of the lateral inner frame parts 221 of the outer wall grille 210 into the interior of the flow channel. The small animal protection grid 235 is hung there.

• Die Zusatzlammelle 212 schließt sich an die Innenrahmenteile 221 an und schließt so den Innenrahmen nach oben hin wie ein Deckel ab.
• Die Zusatzlamelle 212 erstreckt sich von der Innenseite des Blendrahmens 216 über die Wandanschlussebene E hinweg auf die obere Lamelle 211 zu.
• Zur oberen Lamelle 211 wird ein kleiner Spalt als Abstand gewahrt, der zwar für die Luftströmung keine wesentliche Bedeutung hat, aber das Abfließen von in der Wandanschlussebene W eintretendem Wasser auf die obere Lamelle 211 ermöglicht.

In figure 11 the outer wall grille 210 is shown seen obliquely from above. The position and function of the additional lamella 212 become particularly clear:

• The additional lamella 212 connects to the inner frame parts 221 and thus closes the inner frame at the top like a cover.
• The additional slat 212 extends from the inside of the window frame 216 across the wall connection plane E to the upper slat 211 .
• A small gap is maintained as a distance from the upper slat 211, which is of no significant importance for the air flow, but allows water entering the wall connection plane W to flow off onto the upper slat 211.

figure 12 shows the connection of the small animal protection grid 235 with the holding frame fastening straps 232 in detail. In addition to a grid surface 236, in which the webs are kept as thin as possible in order to achieve a large flow cross section, the small animal protection grid 235 also includes a grid surface wider and partially folded edge area, which gives the small animal safety gate 235 stability. Hooks 237 are punched out at the edge area and can be inserted into recesses in the small animal protective grid fastening tabs 234 . The small animal protection grid 235 is thus connected to the holding frame in a form-fitting but exchangeable manner.

figure 13 shows the fully assembled wall duct unit 100 in a side sectional view, in order to clarify in particular the positioning of the parts relative to one another in depth, ie in the longitudinal direction of the flow channel.

The direction of flow for the supply air can be from the outside of the building, which in figure 13 left, to the right, towards the inside of the building. In this case, the flow channel 120 in the wall lead-through element 110 is convergent. The direction of flow is reversed for the exhaust air, so that the flow channel 120 is divergent. A wall bushing unit 100 designed according to the invention is suitable for both modes of operation in an unchanged manner.

It is essential that the collecting surface 123 is formed below in the flow channel outer section 121 and ends at an overhanging drip edge 124 . Since the lateral frame parts 221 on the outer wall grating 210 each have a recess 224 on both sides, the drip edge 124 can extend over the entire width of the flow channel and thus laterally over the inner frame of the outer wall grating 210 . The drip edge 124 is located above the lower slat 214, which at the same time figure 1 visible inclined surface 125 in the wall bushing element 110 is covered. The lower slat 214 protrudes outwards over the frame 216 and the wall connection plane, so that water that penetrates somewhere in the upper area of the outer wall lattice 210 drips either directly onto the lower slat 214 or first onto the step in the flow channel 120 and from there over the drip edge 124 reaches the lower lamella 214.

• das Kleintierschutzgitter 235 und dessen Aufhängepunkte am Halterahmen 230;
• Öffnungen in den seitlichen Innenrahmenteilen 221 des Außenwandgitters wie z. B. Ausstanzungen zur Lamellenbefestigung;
• Bohrungen für die Befestigungsschrauben 233;
• die rückwärtigen Kanten aller Lamellen 211, 212, 213, 214;
• die rückwärtigen Kanten des Innenrahmens 220 des Außenwandgitters 210.

It is also important that the following elements or points at which water could enter are moved back from the wall connection level W into the interior of the flow channel 120 and are located above the collecting surface 123 in the flow channel 120:

• the small animal protection grid 235 and its suspension points on the holding frame 230;
• Openings in the lateral inner frame parts 221 of the outer wall grid such. B. Perforations for slat attachment;
• Holes for the mounting screws 233;
• the rear edges of all slats 211, 212, 213, 214;
• the rear edges of the inner frame 220 of the outer wall grid 210.

Wherever water could enter, according to the invention the water is not routed directly to the outside, but always via the collecting surface 123 in the flow channel and from there to the lower lamella 124 and/or the lower flow channel surface 125 of the wall lead-through element 110 and finally diverted away from the wall connection level W via the drip rail 219. Above all, this diversion ensures that water always reaches an area in the center of the flow cross section and flows downwards from there, but does not flow to the outside of the wall lead-through element 110 , where other parts of the building 1 connect to the wall lead-through element 110 .

In figure 14 A detailed view is shown, which is a detail of a perspective sectional view of the wall bushing unit 100 . The section plane is aligned normal to the direction of flow and is located in the flow channel outer section 122 of the wall lead-through element 110. The respective lower area of the lateral inner frame parts 221 of the outer wall grid 210 and the holding frame fastening straps 232 are visible. These are connected to one another via the fastening screw 233.

In this view it can be seen that the collecting surface 123 does not represent a plane between the side surfaces of the flow channel outer section 122, but rises to a side wall in the respective connection area. Viewed from the side, the rising outer area 126 is located outside of the area enclosed by the inner frame 220, so that the narrowing of the opening cross section of the flow channel associated with the rising outer area 126 is negligible. However, dripping water is forced by the rising outer area 126 to flow towards the middle of the collecting surface 123 . It can therefore not collect in the valley areas on the side walls.

The swelling tape sealing strip 223 ensures that any water that may get between the inner frame part 221 of the outer wall grid 210 and the holding frame fastening straps 232 is first directed into the center of the flow channel and then from there along the previously described path to the outside via the collecting surface 123 must take.

Since the swellable tape sealing strip 223 fills the gap between the lateral inner frame parts 221 of the outer wall grid 210 and the retaining frame fastening straps 232, there is also a clamping effect during assembly. In this way, the outer wall lattice 210 is secured against falling immediately after insertion, even before the fastening screws are tightened.

figure 15 shows a second embodiment of a wall bushing unit 100 within a part of a building 1 in a side sectional view. The outer wall lattice 210 and the holding frame 230 are unchanged from the first embodiment. Of a flow channel 120', the rectangular flow channel outer portion 122' is also consistent with the first embodiment. The only difference is a wall lead-through element 110'. In this case, a connecting piece 112' is arranged much higher on the rear side 111' than in the first embodiment, so that the flow channel inner section 121' is also correspondingly higher on the Rear 111 'is attached and the flow channel outer portion 122' drops down. Due to the height offset between the center of the opening of the flow channel 120' at the connecting piece 112' and the unchanged position of the center of the flow channel outer section 122', it follows that in the flow channel inner section 121' all areas of the wall - including the wall in the upper area - slope outwards so that condensed water or moisture drawn in during suction operation of the wall bushing unit 100 can drain to the outside.

Reference List

100; 100'

wall bushing unit

110; 110'

wall bushing element

111; 111'

back

112; 112'

connecting piece

113

hose intake

114

mounting hole

115

outer face

116

mounting holes

117

grooves

120; 120'

flow channel

121; 121'

flow channel interior section

122; 122'

flow channel outer section

123

catchment area

124

drip edge

125

lower flow channel surface

126

rising outdoor area

140

hose connection adapter

141

hose connector

142

support plate

143

hanger bolt

144

knurled nut

145

dowel

146

collar

210

outer wall grille

211

upper lamella

211.1

Nose

212

additional slat

213

middle slats

214

lower slat

215

lateral protrusions

216

frame

217

Source tape sealing strips

218

sealing strips

219

rear mirror surface

220

inner frame

221

lateral inner frame parts

222

slots

223

lateral sealing strip

224

recess

225

front mirror surface

229

drip tray

230

holding frame

231

Holding frame outer element

232

Holding frame attachment tabs

233

mounting screws

234

Small animal gate attachment tabs

235

small animal protection grid

236

grid surface

237

hook

W

wall connection level

Claims (21)

Wall bushing unit (100; 100') for connection to a domestic appliance, at least comprising: - a wall lead-through element (100; 100') with a flow channel (120; 120'), which comprises a flow channel inner section (121; 121') and a flow channel outer section (122; 122'), - An outer wall grille (210) with an inner frame (220) with at least two parallel lateral inner frame parts (221), between which several slats (211, 213, 214) are arranged, which are each aligned obliquely to a front side to be aligned towards the outside of the building , and with a frame (216) enclosing the inner frame (220), the rear side of which forms a mirror surface (219) for contact with a wall connection level (W); characterized, - that the wall lead-through element (100; 100') and the outer wall grid (210) are connected to one another via a holding frame (230), - that the holding frame (230) can be fastened in the area of an outer face (130) of the wall lead-through element (100; 100') to be arranged on the outside of the building and at least two holding frame fastening lugs (232) extend into the flow channel (120; 120') and - that the lateral frame parts (221) of the outer wall grille (210) at least partially overlap with the holding frame fastening straps (232), with at least one fastening means for connecting the outer wall grille (210) to the holding frame (230) being arranged in the overlapping area. Wall duct unit (100; 100') according to Claim 1, characterized in that the inner flow channel section (121; 121') has a round cross section and the outer flow channel section (122; 122') has a rectangular or polygonal cross section, the cross sections of the Sections (121; 122; 121', 122') continuously merge into one another. Wall duct unit (100; 100') according to Claim 1 or 2, characterized in that at least one collecting surface (123) is formed in the lower area of the flow channel outer section (122; 122') and is above a lower flow channel surface (125) at a drip edge (124) ends. Wall duct unit (100; 100') according to Claim 3, characterized in that the lateral frame parts (221) each have a recess (224) into which a step formed by the collecting surface (123) and the drip edge (124) in the flow channel (120 ; 120') protrudes. Wall duct unit (100; 100') according to Claim 3 or 4, characterized in that rising outer regions (126) are formed on the collecting surface (123) at the transition to the lateral walls of the flow channel (120; 120'). Wall bushing unit (100') according to one of the preceding claims, characterized in that an opening of the flow channel (120') on a rear side (111; 111") of the wall bushing element (110; 110') with a vertical offset to the flow channel outer section (122') is arranged such that all peripheral areas of the wall of the inner section (121') of the flow channel fall towards the outer section (122') of the flow channel. Wall bushing unit (100; 100 ') according to any one of the preceding claims, characterized in that in the outer wall grid (210) an additional slat (212) is arranged above the upper slat (211), which is connected to an upper crossbar of the window frame (216) and which slopes downwards to a rear side of the outer wall grille (210), the lower edge the additional lamella (212) maintains a distance to the top lamella (211). Wall duct unit (100; 100') according to one of the preceding claims, characterized in that the lower lamella (214) has lateral projections (215) which extend laterally beyond the inner frame (220) and are attached to a front mirror surface (225) of the Frame (216) abut or are connected to it. Wall duct unit (100; 100') according to one of the preceding claims, characterized in that the rear mirror surface (219) of the window frame is backed with mitred sealing strips (218), the miter planes on the lateral inner frame parts (221) or in the intermediate space between these ends. Wall lead-through unit (100; 100') according to one of the preceding claims, characterized in that at least one swelling tape sealing strip (217) is applied to a rear mirror surface (219) of the window frame or to the sealing strips (218) arranged there. Wall duct unit (100; 100') according to one of the preceding claims, characterized in that a sealing strip (223) is applied to the outside of the lateral inner frame parts (221) or to the inside of the holding frame fastening straps (232), which is attached to the rear of the Outer wall grille (210) drops out. Wall lead-through unit (100; 100') according to one of the preceding claims, characterized in that a drip rail (229) is provided which is connected to the underside of the window frame (216). and which extends outward beyond the outer mirror surface (225) of the frame (216). Wall lead-through unit (100; 100') according to one of the preceding claims, characterized in that the lateral inner frame parts (221) each have at least one slot-shaped recess which extends from an opening on the rear edge of the inner frame part (221) in the direction of the front side . Wall duct unit (100; 100') according to one of the preceding claims, characterized by a small animal protection grid (235) which is connected to the holding frame (230) or to the outer wall grid (210) and which is arranged above the collecting surface (123). Wall bushing unit (100; 100') according to Claim 15, characterized in that the small animal protection grid (235) is provided with hooks (237) on its lateral edges which can be hooked into recesses in the small animal protection grid fastening straps (234). Wall duct unit (100; 100') according to one of the preceding claims, characterized in that the overlapping areas of the lateral frame parts (221) of the outer wall grid (210) and the holding frame fastening straps (232) the fastening means and, if necessary, the small animal protection grid (235) above the Collecting surface (123) are arranged Wall bushing unit (100; 100') according to one of the preceding claims, characterized in that a connecting piece (112; 112') for connecting a hose connection adapter (140) is formed on the rear side (111; 111') of the wall bushing element (110; 110'). is, Wall bushing unit (100; 100 ') according to claim 17, characterized in that on the connecting piece (112; 112') and / or on the back (111; 111') next to the connecting piece (112; 112') several threaded pins are provided, to which the hose connection adapter (140; 140') can be fastened. Wall duct unit (100; 100') according to Claim 18, characterized in that the threaded pins are held in dowels (145) which are embedded in the wall duct element (110; 110'). Wall lead-through unit (100; 100') according to Claim 18 or 19, characterized in that the hose connection adapter (140) comprises a support plate (142) which has recesses for passing through the threaded pins. Wall lead-through unit (100; 100') according to one of Claims 18 to 20, characterized in that the threaded pins are each part of a hanger bolt (143) which is inserted into a dowel (145).

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