AT9664U1 - HEAT RECOVERY UNIT - Google Patents

Description

2 AT 009 664 U1

The invention relates to a heat recovery device for installation in a wall opening opening of a wall, with a heat exchanger, a shut-off device for selectively closing or opening an air duct between a wall inside of the wall and a wall outside of the wall and with a fan motor driven by an electric fan having fan by means of which Air from the outer wall side through the air duct along and / or through the heat exchanger to the inner wall side and / or vice versa for loading and / or ventilation of a space bounded by the wall is conveyed.

Such heat recovery devices have become known in practice and are used as decentralized wall mounted devices for controlled ventilation with integrated heat recovery.

Typical applications are single or multi-storey residential buildings, townhouses, hotels, guesthouses, retirement homes and the like. The heat recovery devices can also be used advantageously in the renovation of, for example, residential systems without supply and exhaust air lines. So it is both an installation in new buildings as well as a subsequent installation possible.

A known from practice heat recovery device of the applicant consists of three components, namely one on one of the width of the wall, in the wall opening the device to be installed, tuned length orderable, rectangular wall bushing made of plastic, replaceable therein by inserting, from a rigid , rectangular plastic fan housing, with an internal grid, which is fastened by means of screws to the plastic housing, with an integrated external electrical shutter, a heat exchanger and a fan as well as with a wall bushing by means of screws attachable outer cover with insect screen.

Correspondingly, this heat recovery unit is not only available for the new building with a time-delayed installation of the fan unit not only as a complete unit, but also in two delivery sets. A first delivery set comprises the wall bushing and the outer cover and the second delivery set comprises the fan insert with integrated flap.

A also known from practice heat recovery device of the applicant comprises a cross-heat exchanger made of plastic, two fans for the fresh air supply on the one hand and for the exhaust air discharge on the other hand, an air filter and optionally an electrically operated outer shutter and an inner and outer grilles, each by means of screws be attached to one of the aforementioned components receiving rectangular housing made of a rigid plastic. This housing, together with the components of the fan already installed in it, must be installed in a suitably designed opening in a wall. In order to cover a range of different thickness walls, the housing consists of two telescoped and relatively telescoping housing parts.

In the two aforementioned cases, a rectangular wall opening must be made. This is complicated and expensive.

In the former case, the wall bushing must be ordered depending on the width of the wall, or a plurality of different length bushing sleeves must be transported to the site and provided there to have available on site a wall bushing with a suitable length.

In the second case, although with the telescopic housing a certain 3 AT 009 664 U1

Covered area of different sizes wall thicknesses, but this area is limited by the length of the items. For intermediate lengths that are smaller than the maximum extension length, an increased and unnecessary expenditure on material, weight and costs is unavoidable.

In both cases, the fan components, such as the heat exchanger, the fan or fans and the outer flap, relatively expensive in a rectangular housing part, which consists of a rigid plastic, fixed by means of screws, so that the assembly and disassembly of these components, for example Maintenance and repair is expensive.

The previously used and rotatable about axes of rotation outer closure flaps claim a comparatively large installation space and achievable with these Abschiussklappen sealing effect can be improved.

In the two aforementioned, previously known from practice examples of heat recovery devices for removing both the outer grid and the inner grid, the respective fastening screws using a suitable tool, such as a screwdriver, be removed. This makes the regularly required at certain intervals replacement of the air filter and the maintenance of these components consuming.

It is therefore an object of the invention to provide a in many respects improved heat recovery apparatus which avoids the disadvantages of the prior art described above.

This object is solved by the features of claim 1. In this way, expenses and manufacturing costs can be saved both in the production of the wall opening as well as in the production and installation of the wall feedthrough device, as well as in the manufacture, installation and disassembly of the fan insert, so that in the sum of a considerable savings in effort and costs can be achieved.

According to an advantageous embodiment, it may be provided that the wall feedthrough device is designed with a plurality of round wall rings which can be attached to one another. As a result, a wide range of different wall thicknesses can be covered easily, quickly and cost-effectively as well as with minimal weight and minimum material usage. Depending on the wall thickness, a ring can additionally be attached. The wall rings may advantageously consist of a thermoplastic material, in particular of EPP (expanded polypropylene). In particular, the wall rings or one of the wall rings can be easily cut to the desired length.

According to a preferred embodiment, at least three wall rings may be provided to form a certain minimum length, each concrete ring in a specific embodiment may have a length of about 120 mm, so that a total minimum length of about 360 mm can be realized.

According to an advantageous embodiment may further be provided that each wall ring at one of its front ends or at both its facing away from each other Stimenden insertion and centering and has at its other front end or at its two ends to matching receiving elements, so that the front side put one another Wall rings are centered relative to each other and positively connected and rotatably connected or connected. This allows a simple, fast and secure installation of the wall rings to a common annular or tubular and substantially round wall bushing device.

For the purpose of a bodyshell assembly of the wall feedthrough device in the wall opening opening can be provided that in the wall feedthrough device this 4 AT 009 664 U1 stiffening and cross-sectional cross-shaped reinforcing insert made of plastic, preferably made of polystyrene, replaceable or inserted, in the region of its two front ends respectively a plaster cover made of plastic, preferably made of polystyrene.

It is thus possible to offer a first delivery set, which consists of a wall feed-through device which can be formed with one or more wall rings and the reinforcing insert together with cleaning lids. This unit is particularly easy and quick and inexpensive to use in a wall opening hole made with a matching inner diameter in the course of structural work and secure it there. For the purpose of a final assembly then a second delivery set can be provided, which includes the fan insert and expediently an inner cover and an outer cover.

A particularly simple, cost-effective and stable construction can be achieved in that at least one of the plaster cover has recesses arranged in a cross shape, in the end pieces of the cross-shaped reinforcement insert preferably engage in a form-locking manner at a distance from one another.

An installation of the wall feedthrough device with the integrated reinforcement insert can be achieved in a particularly simple and correct manner in that at least two of the end pieces protrude beyond the outer surface of at least one of the plaster cover, preferably the inner cover. On the protruding surfaces of the end pieces can advantageously be placed a spirit level, so that in this way a correct position installation of the wall feedthrough device is simple and inexpensive.

According to a particularly advantageous embodiment, it can be provided that the fan insert is limited at least in the circumferential direction by a foam body of a thermoplastic material.

This foam body may preferably consist of EPP (expanded polypropylene), which may preferably have a closed-cell material structure. As a result, a particularly high energy absorption in conjunction with good resilience and low water absorption can be achieved with this foam body. Also, such a foam body has a high resistance to deformation even with prolonged continuous load. Due to its chemical structure, such a foam body is resistant to all common acids, alkalis and cleaning agents. In addition to its wide temperature range of minus 40 to 110 degrees Celsius, such a foam body is characterized by a very good thermal insulation.

In an advantageous embodiment of the invention can be provided that at least the heat exchanger and the fan are positively embedded in a the fan insert at least in the circumferential direction limiting foam body made of a thermoplastic material such as EPP and supported by this.

Further or additionally it can be provided that all essential for the ventilation and / or venting components are positively embedded in a the fan insert at least in the circumferential direction limiting foam body made of a thermoplastic material and supported by this.

In addition or in addition it can be provided that all essential for the operation of the electric motor and the preferably electrically operable shut-off components are positively embedded in a fan insert at least in the circumferential direction limiting foam body made of a thermoplastic material and supported by this.

According to a preferred embodiment, it may further or additionally be provided that all for the operation of the heat recovery device as such essential components 5 AT 009 664 U1 are positively embedded in a foam insert at least in the circumferential direction limiting foam body made of a thermoplastic material and supported by this.

A particularly simple assembly and disassembly of the aforementioned components in the foam body can be achieved in that the foam body consists of at least two interconnected or connected shells. It is particularly advantageous if the foam body consists of two half shells which can be connected to one another. Advantageously, the shells can be positively connected to each other or connected. It is particularly advantageous when the said shells are connected or connected to one another at longitudinal edges running parallel to the longitudinal axis of the wall leadthrough device. Furthermore, it may expediently be provided for each shell to have a length which corresponds essentially to the length of the wall ring or the length of a plurality of mutually inserted or the length of all wall rings fitted on one another.

According to an advantageous embodiment, it may further be provided that on the fan insert and / or on the wall bushing on the one or the inner wall side associated side of the fan insert and the wall bushing device frontally completely covering inner cover manually, tool and screw-free and releasably secured. As a result, the inner cover without tools can be quickly assembled or disassembled by hand, whereby a simple and quick filter change is possible.

Conveniently, it can be provided that the inner cover is fixed manually, tool and screw-free as well as releasably by means of preferably exclusively acting on the fan insert, preferably exclusively on the foam body of the fan insert fastening means.

For this purpose, it may be provided that the inner cover is designed with in the fan insert inwardly extending fastening bodies which have in the region of their inwardly facing free ends extending transversely outwardly locking lugs which engage frictionally on an inner wall of the fan insert and / or in there provided recesses positively latch or are engaged.

In particular, in connection with the use of a tool and screw-fastened or detachable inner cover can be provided in compliance with machine protection guidelines to avoid injury to persons, especially in a filter change, provided that the fan at least through the heat exchanger from the inner cover separated and offset to the outer wall side, so preferably outside wall side is arranged in the fan tray. Because then the air filter can be arranged on the inner wall side in front of the heat exchanger, so that it can be easily and easily removed to the inner wall side without the risk of reaching in rotating parts, such as the electric motor and the fan blades.

Furthermore, it can be provided that viewed in the direction of the inner wall side, so outside wall side, in front of the fan a with a plurality of tightly sealable fins ausgestalteter and preferably electrically disposed from an open position to a closed position and vice versa operable outer closure, preferably such that at switched off fan, an influx of air, especially cold air, is avoided or prevented in the fan tray. The use of such a lamellar flap so that not only a particularly good seal against cold air can be achieved and thus avoid the formation of condensation and / or icing of located in the fan insert components, but also a particularly space-saving design and therefore a particularly achieve compact heat recovery unit. 6 AT 009 664 U1

It may further be provided that adjoins the fan insert on the outer wall side side associated with the fan insert and the wall bushing completely covering the outer cover, the first opening for the supply of fresh air in the fan unit and a second opening for the discharge of exhaust air the fan unit, which are airtight separated by a partition in one or two chambers of the outer cover, which have in open and in opposite directions outwardly open, serving as an air inlet or as an air outlet openings. As a result, a 100% air separation of outside air on the one hand and exhaust air on the other hand can be achieved.

Such outer cover may preferably be made of stainless steel.

Furthermore, it can be provided that the outer cover has a circular segment-shaped cross section with a convexly outwardly curved surface in a sectional plane containing the longitudinal axis of the fan insert. The outer cover may preferably be designed in a direction perpendicular to the aforementioned cross-section with flat or straight outer edges, so that the outer cover may have a cylindrical outer shape with a circular segment-shaped cross-section. Such an outer cover satisfies particularly advantageous the increasing requirements in terms of advantageous air flow and stability and also convinces by a particularly shapely exterior.

Further advantages, features, details and aspects of the invention are the following description part can be removed, in which an advantageous embodiment of the invention with reference to the figures will be described in more detail.

Show it:

Fig. 1 is a three-dimensional representation of a heat recovery device with longitudinal section;

Figure 2 is a horizontal section through the heat recovery device, which is installed in a wall opening opening of a wall, along the section lines 2-2 in Fig. 1. Fig. 3.1 is a three-dimensional representation of a wall bushing device consisting of three stacked wall rings;

FIG. 3.2 is a side view of the wall bushing device according to FIG. 3.1; FIG.

3.3 shows a side view of one of the wall rings of the wall feedthrough device according to FIG. 3.1, the inner edges of which are indicated by dashed lines;

Fig. 3.4 is a front view of a round outer cross-section having wall bushing device according to FIG. 3.1;

FIG. 4.1 shows a three-dimensional representation of a cross-shaped reinforcing insert partially inserted into two wall rings of a wall feedthrough device with an inner plaster cover; FIG.

Fig. 4.2 is a plan view of the reinforcement insert according to Fig. 4.1, without depiction of the wall rings;

4.3 shows a side view of the reinforcing insert according to FIG. 4.1 with a support for a spirit level towering up there, without showing the wall rings; Figure 4.4 is a front view of the reinforcement insert according to 4.1, without showing the wall rings.

Figure 5.1 shows a three-dimensional representation of a composite of two half-shells and the fan insert on all sides limiting structure foam body.

FIG. 5.2 shows a three-dimensional representation of the half shell shown on the right in FIG. 5.1;

FIG. 5.3 is a side view of the structural foam body according to FIG. 5.1; FIG.

FIG. 5.4 is a front view of the structural foam body according to FIG. 5.1; FIG.

FIG. 5.5 is a top plan view of the structural foam body of FIG. 5.1; FIG.

Fig. 6.1 is a three-dimensional view of an essential structural component of an inner cover;

FIG. 6.2 shows a side view of the structural component according to FIG. 6.1; FIG. 7 AT 009 664 U1

FIG. 6.3 shows a plan view of the structural component according to FIG. 6.1; FIG.

FIG. 6.4 is a side view of the structural component according to FIG. 6.1, rotated 90 degrees relative to the view of FIG. 6.2; FIG.

Fig. 7.1 is a side view of an outer cover;

FIG. 7.2 is a plan view of the outer cover according to FIG. 7.1; FIG.

Fig. 7.3 is a greatly enlarged view of a section of the outer cover of FIG. 7.1.

The decentralized heat recovery device 20 shown in different sectional images, in particular in FIGS. 1 and 2, comprises a fan insert 25, which is inserted into a tubular wall leadthrough device 23 which, in turn, as shown in FIG. 2, is inserted or installed in a wall opening 21 of a wall 22 , Both the wall feedthrough device 23 and the fan insert 25 can each be handled separately prior to their installation.

The wall feedthrough device 23 here consists of three round wall rings mounted on one another, which are designed with an outer radius 72 or with an outer diameter 73 (FIGS. 3.2 and 3.4). The wall ring 37 is suitable and intended to be used in a round wall opening 21, which can be realized as a so-called Kembohrung simple and fast in a wall 22, for example.

Each wall ring 37; 37.1, 37.2, 37.3 has here at one of its Stimenden 38.2 insertion and centering 39.1, 39.2, 39.3, which extend over a certain circumferential angle over the end circumference. In this case, comparatively narrow first insertion and centering elements 39.1 are provided, which are each arranged radially outboard. Furthermore, between each of these first insertion and centering elements 39.1, wider second and third insertion and centering elements 39.2 and 39.3 are provided, which thus extend over a comparatively larger circumferential angle and which are each arranged radially on the inside.

Each wall ring 37; 37.1, 37.2, 37.3 has at its other end face 38.1 to the insertion and centering elements 39.1, 39.2, 39.3 fittingly shaped receiving elements 40.1, 40.2, 40.3 for these insertion and centering 39.1, 39.2, 39.3. The receiving elements 40.1 for the insertion and centering 39.1 are each designed as radially outwardly open grooves. The receiving elements 40.2 and 40.3 for the insertion and centering 39.2 and 39.3 are each designed as radially inwardly open grooves. In this way, the mutually plugged wall rings 37.1, 31.2, 37.3 are centered relative to each other and positively connected and rotationally fixed to each other.

The wall rings 37; 37.1, 37.2, 37.3 are made of plastic, preferably of a cuttable plastic, in particular of a thermoplastic material. A preferred material in this respect is EPP (expanded polypropylene).

According to a preferred embodiment, the wall rings 37; 37.1, 37.2, 37.3 an outer radius 72 of about 175 mm, so are suitable for a core hole or wall opening opening 21 designed with an inner diameter of about 350 mm. The wall rings 37.1, 37.2, 37.3 are each designed identically, so that an arbitrarily multiple combination of successively and successively attachable wall rings 37 can be realized. The individual wall rings 37.1, 37.2, 37.3 here have an identical length 80. As also shown in Figure 3.2, in the assembled state of two or more wall rings 37.1, 37.2, 37.3 each a final wall ring with this original length 80 can be seen, while the remaining wall rings 37.1, 37.2 then only with a height of the nested plug - And centering elements 39.1, 39.2, 39.3 reduced length 54 can be seen.

According to a preferred embodiment, the not yet mated 8 AT 009 664 U1

Wall rings 37.1, 37.2, 37.3 a minimum length of about 123 mm and the insertion and centering 39.1, 39.2, 39.3 have a height of about 11.5 mm. This results in the successive plugged state of the wall rings 37.1, 37.2, 37.3 for the first two wall rings 37.1 and 37.2 an outer length 54 of about 111.5 mm.

Depending on the wall thickness 75 of the wall 22, the number of wall rings 37.1, 37.2, 37.3 are increased, wherein in the embodiment shown at least three of said wall rings 37.1, 37.2, 37.3 are provided to the necessary for the ventilation in the components Lüftereinsatz 25 to accommodate. For larger wall thicknesses of the wall 22 then one or more additional wall rings 37 can be placed, which can be easily cut to the desired length if necessary.

For the purpose of a shell assembly of the wall bushing device 23 in the wall opening 21, a stiffening and cross-sectionally cross-shaped reinforcing insert 41 made of plastic, preferably made of polystyrene used in the wall bushing device 23, as is indicated for example in Fig. 4.1. The cross-shaped reinforcing insert 41 is here made up of four plate-like wall parts 42.1, 42.2, 42.3, 42.4, which are each arranged at an angle of 90 degrees to each other, so that in cross section a limited by rectangular surfaces cross is formed. The reinforcement insert 41 has on its inside front end 43.1 and on its outside, facing away from the front end 43.2, each a plaster cover 44.1, 44.2 made of plastic, preferably made of polystyrene. Each Putzdeckel 44.1, 44.2 has four crosswise to one another and at a circumferential angle of 90 degrees to each other staggered recesses 45.1, 45.2, 45.3, 45.4, for receiving suitably shaped end pieces 46.1, 46.2, 46.3, 46.4 of the wall parts 42.1, 42.2, 42.3 , 42.4 serve, so that in the assembled state, the end pieces 46.1 to 46.4 are positively secured in the respective recesses 45.1 to 45.4 of the two plaster cover 44.1 and 44.2.

As can be seen from FIGS. 4.1 to 4.3, two of the oppositely arranged end pieces 46.1 and 46.3 are made longer on the side of the inner plaster cover 44.1 than the two other end pieces 46.2 and 46.4. The said end pieces 46.1 and 46.3 project respectively beyond the outer surface 47 of the inner plaster cover 44.1 and have mutually parallel and mutually aligned bearing surfaces 48.1 and 48.2. On these support surfaces 48.1 and 48.2 can be placed for the purpose of a correct position mounting the wall bushing device 23, a spirit level. The fact that the reinforcing insert 41 is positively and / or positively connected in its in the wall bushing 37 formed with the wall penetrating device 23 state with the wall rings 37 can now by turning the reinforcing insert 41 together with the wall feedthrough device 23 latter with the aid of the spirit level in the correct position be positioned so that then after insertion or insertion of the fan insert 25 in the wall feedthrough device 23, the fan insert 25 is also positioned with its components in the correct position in the wall opening 21 of the wall 22.

The fan insert 25 comprises a chassis-like shaped body, which is designed here as a foamed body 49 formed from two half-shells 50.1 and 50.2 (see FIGS. 5.1 to 5.5). The foam body 49 here consists of a thermoplastic material, preferably also made of EPP, ie expanded polypropylene. This material consists of thermoplastically deformable foam beads and preferably has a closed-line structure. This material has a high energy absorption with a good resilience and also a low water absorption. This material also has a high resistance to deformation even with a prolonged continuous load. In addition, this material has a very good thermal insulation.

The two half shells 50.1 and 50.2 are, as can be seen in particular from Figures 5.1, 5.3 and 5.4, via interlockable fixing and centering positively connected to each other 9 AT 009 664 U1 connected, in the embodiment shown parallel to the longitudinal axis of the wall bushing device 23 extending Longitudinal edges 51.1; 52.1, 52.2. Each half-shell 50.1 and 50.2 has a length 53 (FIG. 2) which essentially corresponds to the length 54 of the wall lead-through device 23.

In the embodiment shown, all for the operation of the heat recovery device 20 as such essential components, ie the heat exchanger 26, the two fans 33, the shut-off devices 27 forming outer closures 62, the two air filters 24.1 and 24.2, a control board 70, the lines and a power connector 71 or a power connector socket positively embedded in the fan insert 25 limiting foam body 49 and carried by this (see Figures 1 and 2).

In the assembled state of the fan insert 25 includes from its the inner wall surface 29 associated side to the outer wall 30 associated side viewed from two separate air filters 24.1, 24.2 here by means of a Velcro easily and quickly manually on the outer surfaces of an aluminum cross heat exchanger 26 again releasably are attached.

To the heat exchanger 26, specifically at the other two, also at an angle of about 90 degrees to each other standing outer surfaces, each associated with this two adjacent to each other and spaced from each other arranged fans 33 at. These are designed here as axial fans. Each fan has fan blades 32, which are driven by an electric motor 31.

In the embodiment shown, a DC motor with soft commutation and a long-term ball bearing is used in each case. This allows a very quiet and permanent operation of the fans 33rd

A first fan 33, which is shown at the top left in FIG. 2, serves to convey air from the outside wall 33 through an air duct 28 through the heat exchanger 26 to the inside wall 29 for the purpose of ventilating a space 81 defined by the wall 22 while the other fan 23, which is shown in Figure 2 bottom left, serves to promote air from the inner wall side 29 forth through the heat exchanger 26 to the outer wall side 30 toward the purpose of venting the space 81. In the area of the heat exchanger 26, therefore, the air flows conveyed by the two fans 33 cross each other, which is why, in the present case, this is referred to as a cross-heat exchanger.

As can be seen in particular from FIGS. 1 and 2, an inner cover 55 which covers the fan insert 25 and the wall feed-through device 23 and also the wall opening 21 is provided on the side associated with the inner wall 29 of the fan insert 25. This is there manually, tool and screw-free and releasably secured. For this purpose, the inner cover 55, whose shaped body 78 is shown in different views in Figures 6.1 to 6.4, in the fan insert 25 inwardly extending mounting body 57. These have in the region of their inwardly facing free ends 58 transversely outwardly extending locking lugs 59 which engage in recesses 61 in the inner wall of the foam body 49 and the half-shells 50.1, 50.2. Consequently, the inner cover 55 with its shaped body 78 by means of exclusively acting on the foam body 59 of the fan insert 25 fasteners manually, tool and screw-free and releasably secured. As a result, the inner cover can be easily and quickly mounted manually without tools and manually disassembled, whereby a simple and faster manual change of the filter 24.1, 24.2 is possible.

The inner cover 55 consists of a fixing body 57 having molded body 78 and a thin outer panel 79. The latter delimits the air chambers formed by the molding 78 AT 009 664 U1 and is with lateral outlets or inlets for a discharge 35 of spent air from the Room 81 or designed for a supply 36 of heated fresh air (Figure 2).

As can also be seen in particular from FIGS. 1 and 2, the outer side wall 30 of the fan insert 25 is adjoined by an outer cover 82 which completely covers the fan insert 25 and the wall lead-through device 23 as well as the wall opening 21. This is shown in their special design in different views and magnifications in the figures 7.1 to 7.3. The outer cover 82 has on its underside a first opening 62.1, which is assigned to the fan 33 shown in Figure 2 at the top left for the supply of fresh air in the fan unit 25, and has a second opening 62.2, the bottom left in Figure 2 Fan shown for the discharge 35 is associated with exhaust air from the fan tray 25.

The openings 62.1 and 62.2 are airtightly separated from each other by a partition wall 63 forming two chambers 64.1 and 64.2 within the outer cover 65. These two chambers 64.1, and 64.2 each have laterally open in opposite directions to the outside, serving as an air inlet 65 and air outlet 66 openings. These lateral openings, of which an opening is shown in FIG. 7.1, are preferably provided with a fly screen 67.

The outer cover 82 can be releasably fastened to the outer wall again by means of fastening screws which can be inserted through four recesses 68 here.

Below is a brief summary of the functional description of the heat recovery device 20 according to the invention:

The heat recovery unit 20 is a decentralized wall mounted unit for controlled ventilation with integrated heat recovery. The heat recovery device 20 brings fresh, filtered air, depending on the requirements with filter class G 4 or via a pollen filter F 7 zugfrei in a room 81 and at the same time there performs the used air (arrow 35 in Figure 2). With the help of the heat recovery device 20 so a comfortable room climate is created without windows must be opened.

In the internal aluminum cross-heat exchanger 26, the heat of the used air is stored and delivered to the externally supplied fresh air contactless, which is then filtered in the room 81 is available (arrow 36 in Figure 2). In this way, up to 70% of the heat can be recovered from the used exhaust air and the mold danger can be eliminated by too high a humidity in the room. In addition, the heat recovery unit 20 can save significant amounts of energy because the windows no longer need to be opened in an uncontrolled manner.

Due to the practical efficiency of the heat exchanger 26, any icing of the device is prevented. Two very tight electrically operable Lamelien outer closures 62 with lamellae 84 (see Figures 1 and 2) for the outside and the exhaust air prevent the influx of cold air with heat recovery device 20. All mechanical or electrical components of the heat recovery device 20 are of the space or .Inside wall side 29 easy to reach. As a result, this decentralized heat recovery wall unit is also ideally suited for multi-storey residential construction.

The round wall bushing device 23 enables a quick, simple, inexpensive and tool-free and screw-free manual mounting in the wall 22 by means of a core hole which can be produced easily and inexpensively in a wall 22. The wall feed-through device 23 is fitted as standard with a reinforcement designed as a styrofoam cross. 11 AT 009 664 U1 kung insert 41 and against contamination of the interior with two cleaning lids 44.1, 44.2. A connection cable 230 Volt / 50 Hz is inserted into the provided bushing. A shapely stainless steel outer cover 82, which allows a 100% air separation between the outside air and the exhaust air and which can be equipped with a fly screen, adapts elegantly to any exterior facade. It is attached to the outside wall with four stainless screws. The fan insert 25 with fans 33, heat exchanger 26 and electronics (radio and control board 70 and connector 71, Figure 1) is inserted into the prepared sleeve-like wall bushing device 23 and then electrically connected to an electrical connector / coupling connection. The connector 71 is inserted into the foam body 49 and inserted into the prepared there opening.

The inner cover 55 with its preferably made of EPP (expanded polypropylene) moldings and with its outer lining 79 made of a stable plastic, is pressed with its locking lugs 59 having fastening bodies 57 in the recesses 61 and snaps on the fan insert 25. A screw fastening is not necessary. Consequently, the inner cover 55 can be easily and quickly assembled and disassembled manually and without tools, whereby a simple and quick filter change is possible. There are two filters 24.1, 24.2 arranged, namely a first filter 24.1 in the exhaust air 83 (see arrow 35 in Figure 2) and a second filter 24.2 in the supply air (see arrow 36 in Figure 2). Both filters 24.1 and 24.2 can be easily serviced from the inside wall 29 ago. If necessary, pollen filters can also be used. Two energy-saving DC electric motors 33 with long-term ball bearings and an intelligent Softkommutierung meet specifically the requirements of such a heat recovery device 20. These DC motors 31 are extremely quiet and suitable for continuous operation. The control electronics (radio and control board 70) of the heat recovery device 20 includes all given in accordance with the latest standards functions. Thus, if one of the DC motors 31 fails, the other DC motor 31 is automatically turned off. If the heat recovery device 20 is not active, that is switched off, the electric Lamellia outer closure 62 closes off the two air channels 28 towards the outer wall side 30 in a sealed manner. The heat recovery unit 20 is controlled by a radio hand transmitter, which can be adjusted with an on / off button and a four-step button for different air flow rates of 15, 35, 50 and 80 cubic meters per hour. About the radio hand transmitter, up to five heat recovery devices 20 can be controlled. By means of the radio hand transmitter, a timer for the monitoring of the filters 24.1, 24.2 can be set arbitrarily. All functions are displayed in the radio hand transmitter in a display.

The following list represents an important part of the description: 20 Heat recovery unit 44.2 Plaster cover (outer plaster cover) 21 Wall opening 45.1 Recess 22 Wall 45.2 Recess 23 Wall bushing 45.3 Recess 24.1 Air filter 45.4 Recess 24.2 Air filter 46.1 End of 42.1 25 Fan insert 46.2 End of 42.2 26 Heat exchanger 64.3 End piece of 42.3 27 Shut-off device 64.4 End piece of 42.4 28 Air duct 47 Outer surface of 44.1 29 Inner wall side 48.1 Surface 30 Outside wall side 48.2 Surface 31 Electric motor 49 Foam body 32 Fan blade 50.1 Half shell 33 Fan 50.2 Half shell 34 Fresh air supply 51.1 Longitudinal edge of 50.1

Claims (23)

AT 009 664 U1 12 35 Waste of used air 51.2 Longitudinal edge of 50.2 36 Supply of heated air 53 Length of 50.1, 50.2 37 Wall ring 54 Length of 37 37.1 Wall ring 55 Inner cover 37.2 Wall ring 56 Fastener 37.3 Wall ring 57 Fastening body 38.1 Front end of 37 58 free end of 57 38.2 Front end of 37 59 Latch 39.1 Insertion and centering element 60 Inner wall of 25, 49 39.2 Insertion and centering element 61 Recess 39.3 Insertion and centering element 62 External closure 40.1 Receiving element 62.1 First opening 40.2 Receiving element 62.2 Second opening 41 Reinforcement insert 63 Partition wall 42.1 Wall section 64.1 Chamber 42.2 Wall section 64.2 Chamber 42.3 Wall section 65 Air inlet 42.4 Wall section 66 Air outlet 43.1 Front end of 41 67 Fly screen 43.2 Front end of 41 68 Recess 44.1 Putzdeckel (interior plaster cover) 70 Radio and control board 76 Uncoupling body 71 Plug connection 77 Fold 72 Outside radius 78 Form body 73 Outside diameter r 79 Exterior trim 74 Slat 80 Length of 37 75 Wall thickness 81 Room 82 Exterior cover 83 Exhaust air Requirements: 1. Heat recovery unit (20) designed for installation in a wall opening (21) on a wall (22) using a separately handled pre-installation kit the through wall opening (21) replaceable wall bushing device (23) is suitable and intended with a in the wall bushing device (23) replaceable fan insert (25) having a heat exchanger (26), a shut-off device (27) for selectively closing or opening an air duct (28 ) between an inner wall side (29) of the wall (22) and an outer wall side (30) of the wall (22) and a by means of an electric motor (31) driven fan blades (32) having fan (33) by means of which air from the outer wall side ( 30) through the air duct (28) along and / or through the heat exchanger (26) to the inner wall side (29) and / or vice returns, for the ventilation and / or venting of a wall (22) limited space (81) is conveyed, wherein the wall bushing device (23) with a round or as a round wall ring (37; 37.1, 37.2, 37.3) which is suitable and intended to be inserted into the preferably round wall opening (21). 2. Heat recovery device according to claim 1, characterized in that the wall bushing device (23) with a plurality of attachable round wall rings (37.1, 37.2, 37.3) is designed. 3. Heat recovery device according to claim 2, characterized in that each wall ring (37.1, 37.2, 37.3) at one of its front ends (38.2) or at both its facing away from each other front ends (38.1, 38.2) insertion and centering elements (39.1, 39.2, 13 AT 009 664 U1 39.3) and at its other front end (38.1) or at its two stimuli (38.1, 38.2) has matching receiving elements (40.1, 40.2), so that the wall rings (37.1, 37.2, 37.3 ) are centered relative to each other and positively connected and rotatably connected to each other. 4. Heat recovery device according to one of claims 1 to 3, characterized in that for the purpose of a shell assembly of the wall feedthrough device (23) in the wall opening (21) in the wall bushing device (23) a stiffening this and cross-sectionally shaped reinforcing insert (41) made of plastic, preferably made of styrofoam, is used, which in the region of its two front ends (43.1, 43.2) each have a plaster cover (44.1, 44.2) made of plastic, preferably made of polystyrene. 5. Heat recovery device according to claim 4, characterized in that at least one of the plaster cover (44.1, 44.2) cross-shaped recesses (45.1, 45.2, 45.3, 45.4), in the end pieces (46.1, 46.2, 46.3, 46.4) of the cruciform reinforcing insert ( 41) spaced from each other engage positively. 6. Heat recovery device according to claim 5, characterized in that at least two of the end pieces (46.1, 46.3) protrude beyond the outer surface (47) of the plaster cover (44.1). 7. Heat recovery device according to one of claims 1 to 6, characterized in that the heat exchanger (26) and the fan (33) positively embedded in a the fan insert (25) in the circumferential direction limiting foam body (49) made of a thermoplastic material and supported by this are. 8. Heat recovery device according to one of claims 1 to 7, characterized in that all essential for the loading and / or ventilation components form-fitting embedded in a the fan insert (25) in the circumferential direction limiting foam body (49) made of a thermoplastic material and supported by this are. 9. Heat recovery device according to one of claims 1 to 8, characterized in that all for the operation of the electric motor (31) and the preferably electrically operable shut-off device (27) essential components positively in a the fan tray (25) in the circumferential direction limiting foam body (49) embedded and supported by a thermoplastic material. 10. Heat recovery device according to one of claims 1 to 9, characterized in that all of its operation as such essential components are positively embedded in a the fan insert (25) in the circumferential direction limiting foam body (49) made of a thermoplastic material and supported by this. 11. Heat recovery device according to one of claims 7 to 10, characterized in that the foam body (49) consists of at least two interconnectable shells (50.1, 50.2). 12. Heat recovery device according to claim 11, characterized in that the foam body (49) consists of two interconnectable half-shells (50.1, 50.2). 13. Heat recovery device according to one of claims 11 or 12, characterized in that the shells (50.1, 50.2) are positively connected with each other. 14. Heat recovery device according to one of claims 11 to 13, characterized marked 14, that the shells (50.1, 50.2) on parallel to the longitudinal axis of the wall feedthrough device (23) extending longitudinal edges (51.1, 51.2, 52.1, 52.2) to each other attached are connected. 15. Heat recovery device according to one of claims 11 to 14, characterized in that each shell (50.1, 50.2) has a length (53) corresponding to the length (54) of the wall ring (37) or the length of a plurality of mated or the length of all stacked wall rings (37.1, 37.2, 37.3). 16. Heat recovery device according to one of claims 7 to 15, characterized in that the foam body (49) consists of EPP (expanded polypropylene). 17. Heat recovery device according to one of claims 1 to 16, characterized in that on the fan insert (25) and / or on the wall bushing device (23) on whose or the inner wall side (29) associated side of the fan insert (25) and the Wall feedthrough device (23) frontally completely covering inner cover (55) manually, tool and screw-free and is releasably secured. 18. Heat recovery device according to claim 17, characterized in that the inner cover (55) manually, tool and screw-free and releasably secured by means of preferably exclusively on the fan insert (25) engaging fastening means (56) is attached. 19. Heat recovery device according to claim 18, characterized in that the inner cover (55) by means of exclusively on the foam body (49) of the fan insert (25) engaging fastening means (56) is attached. 20. Heat recovery device according to one of claims 18 or 19, characterized in that the inner cover (55) with in the fan insert (25) inwardly extending fastening bodies (57) is designed, which in the region of their inwardly facing free ends (58). have transversely outwardly extending locking lugs (59) which act on an inner wall (60) of the fan insert (25) frictionally engage and / or latch into recesses (61) provided there in a form-fitting manner. 21. Heat recovery device according to one of claims 1 to 20, characterized in that the fan (33) separated at least by the heat exchanger (26) from the inner cover (55) and to the outer wall side (30) towards offset in the fan insert (25 ) is arranged. 22. Heat recovery device according to one of claims 1 to 21, characterized in that viewed in the direction of the inner wall side (29) in front of the fan (33) with a plurality of tightly sealable fins (74) and preferably electrically from an open position in a closed position and vice versa operable outer closure (62) is arranged. 23. Heat recovery device according to one of claims 1 to 22, characterized in that on the fan insert (25) on the outer wall side (30) associated side of the fan insert (25) and the wall feedthrough device (23) completely overlapping outer cover (82) connects comprising a first opening (62.1) for supplying fresh air into the fan tray (25) and a second opening (62.2) for discharging exhaust air from the fan tray (25) through a partition wall (63) to form chambers (64.1, 64.2) are air-tightly separated, which have open in the lateral and in opposite directions to the outside, as an air inlet (65) or as an air outlet (66) serving openings.