DE202005011482U1 - Heat recovery unit for installation into a wall opening comprises a controllable ventilation system with a heat exchanger and electric fans - Google Patents

Abstract

The heat recovery unit (20) for installation into a wall opening comprises a controllable ventilation system (25) with a heat exchanger (26) and electric fans.

Description

The The invention relates to a heat recovery device for installation in a wall opening a wall, with a heat exchanger, a shut-off device for selectively closing or opening an air duct between a wall inside the wall and a wall outside the wall and with an electric motor driven by an electric motor fan blades having fan, by means of the air from the outside 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 recoverable from the wall of limited space is.

such Heat recovery units are off become known in practice and are used as decentralized wall mounted devices for controlled Ventilation used with integrated heat recovery.

typical Areas of application are single or multi-storey residential buildings, terraced houses, hotels, Pensions, retirement homes and the like. The heat recovery devices can also advantageous in the renovation of, for example, residential investments be used without supply and exhaust air lines. So it's both Installation in new buildings as well as retrofitting possible.

One 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 installed to be, tuned length orderable, rectangular plastic wall bushing, one inside insertable by insertion, from a rigid, rectangular Plastic housing formed fan tray, with an internal grid, which is fastened by means of screws to the plastic housing is, with an integrated external electrical shutter, a heat exchangers and a fan, as well as one on the wall bushing Screwable outer cover with insect screen.

This Heat recovery unit is appropriate practical not only for the new building with a time-delayed installation of the fan insert not only as a complete device, but also available in two delivery sets. A first delivery set includes the wall bushing and the outer cover and the second delivery set includes the fan tray with integrated Closing flap.

One also known from practice heat recovery device of the applicant comprises a cross heat exchanger made of plastic, two fans for fresh air supply on the one hand and for the Exhaust air discharge on the other hand, an air filter and optionally an electric actuated Outside shutter as well as an inner and an outer grid, the respectively by means of screws on one of the aforementioned components receiving rectangular housing be attached from a rigid plastic. This housing needs together with the already installed components of the fan in a suitably designed breakthrough of a wall can be installed. To cover a range of different thickness walls, there is the housing off two intertwined and relative to each other telescopic housing parts.

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

In In the former case, the wall bushing must be dependent on the width of the wall be ordered or need it a plurality of different length wall bushings on The construction site will be transported and deployed there in front of Place a wall bushing with a suitable length available to have.

In Although the second case can with the telescopic housing a certain areas of different wall thicknesses are covered, However, this area is limited by the length of the items. For intermediate lengths, the smaller than the maximum extension length, is an elevated and unnecessary Apparent effort on material, weight and costs inevitable.

In both cases are the fan parts, like the heat exchanger, the fan or the fans and the outer flap, comparatively consuming in a rectangular housing part, which consists of a rigid Plastic consists, fixed by means of screws, allowing the assembly and disassembly of these components, for example for maintenance and repair purposes is expensive.

The previously used and rotatable about axes of rotation outer closure flaps claim a comparatively large installation space and with These shutters achievable 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 replacement of the air filter regularly required at certain intervals and also the maintenance of these components consuming.

It is therefore an object of the invention, in many ways improved heat recovery device available too provide, with the disadvantages of the state described above the technique can be avoided.

These The object is solved by the features of claim 1. On this way you can Expenses and production costs both in the production of Wall aperture opening as well as in the manufacture and installation of the wall feedthrough, such as also in the manufacture, assembly and disassembly of the fan tray be saved, so that in total a considerable saving at effort and cost can be achieved.

According to one advantageous embodiment can be provided that the wall bushing with several successive attachable, essentially round wall rings is designed. This can be a big one Range of different wall thicknesses simple, fast and inexpensive as well be covered with minimum weight and minimal use of materials. Depending on the wall thickness can additionally put a ring on. The wall rings can be advantageous from a Thermoplastic plastic, in particular of EPP (expanded Polypropylene) exist. In particular, then the wall rings or a the wall rings can be easily cut to the desired length.

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

According to one advantageous embodiment may further be provided that each Wall ring at one of its front ends or at both its from each other has wegweisenden front ends insertion and centering and at the other end of his head or at both ends has matching receiving elements, so that the front side centered wall rings relative to each other and centered form-fitting and rotatably connected or connected to each other. This allows a simple, fast and secure mounting of the wall rings a common annular or tubular and substantially round Wall entrance.

To the Purpose of a shell assembly of the wall penetration in the wall opening opening can be provided that in the wall feedthrough a stiffening this and cross-shaped in cross section reinforcement insert made of plastic, preferably made of polystyrene, can be used or used is, in the region of its two front ends each a plaster cover made of plastic, preferably made of polystyrene.

It is possible, to offer a first delivery set consisting of one with one or more Wall rings formable wall penetration and reinforcement insert together with cleaning lids. This unit is particularly easy and fast as well as inexpensive in a wall opening opening made in the mating inner diameter Insert the course of the structural work and secure it there. For the purpose Final assembly can then provide a second delivery set which is the fan tray and expediently an inner cover and an outer cover comprises.

A particularly simple, inexpensive and Stable construction can be achieved by at least one of the plaster covers cruciform arranged recesses, in the end pieces of the cross-shaped reinforcing insert preferably spaced from each other engage positively.

One Installation of the wall duct with the integrated reinforcement insert can be achieved in a particularly simple and correct position, that at least two of the tails over the Outer surface at least one of the plaster cover, preferably protrude the inner lid. On the outstanding surfaces the tails can advantageously be placed on a spirit level, so on this way, a correct position installation of the wall bushing easy and cost-effective possible is.

According to one particularly advantageous embodiment can be provided that the fan tray at least in the circumferential direction by a foam body is limited to 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 from minus 40 to 110 degrees Celsius, such a foam body is characterized by a very good thermal insulation.

In Advantageous development of the invention can be provided that at least the heat exchanger and the fan form-fitting in one the fan tray at least in the circumferential direction limiting foam body a thermoplastic such as EPP embedded and of this are worn.

Further or additionally It can be provided that all essential for the ventilation and / or ventilation Components form-fitting in one the fan tray at least in the circumferential direction limiting foam body a thermoplastic embedded and supported by this are.

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

According to one preferred embodiment may further or additionally be provided that all for the operation of the heat recovery device as Such essential components form fit in a fan tray at least in the circumferential direction limiting foam body a thermoplastic embedded and supported by this are.

A Particularly simple assembly and disassembly of the aforementioned components in the foam body let yourself achieve that the foam body of at least two interconnected or connected shells. It is particularly advantageous when the foam body consists of two interconnected half-shells. advantageously, can the shells form-fitting be connected or connected. Particularly advantageous it is when the said shells are parallel to the longitudinal axis the wall bushing running longitudinal edges be connected to each other or connected. Further may suitably be provided that each shell has a length substantially the length of the wall ring or more or all or one another mated wall rings corresponds.

According to one advantageous embodiment can also be provided that on the fan tray and / or on the Wall bushing on whose or the inner wall side associated side a the fan tray and the wall duct completely overlapping at the end Inner cover manually, tool-free and screw-free as well as releasably secured is. As a result, the inner cover can be mounted quickly without tools by hand or dismantled, which also makes it easier and faster Filter change possible is.

Conveniently, It may be provided that the inner cover is manually, tool- and screw-free and detachable again preferably using only the fan tray, preferably exclusively on the foam body of the fan tray is attached to attacking fasteners.

To For this purpose it can be provided that the inner cover with yourself in the fan tray is designed inwardly extending fastening bodies, which in Area of their inwardly facing free ends extending transversely outwardly locking lugs have, which engage frictionally on an inner wall of the fan insert and / or engage in recesses provided there in a form-fitting manner or engaged.

Especially in conjunction with the use of a tool and screw-free fastened or detachable Inner cover can be fulfilled from machinery protection guidelines to injury to persons, especially during a filter change, to avoid being provided that the fan at least through the heat exchanger from the inner cover separated and to the outside wall side offset, so preferably outside wall side in the fan tray is arranged. Because then the air filter on the inner wall side in front of the heat exchanger be arranged so that this then without the danger of reaching in rotating parts, such as the electric motor and fan blades, are simple and can be easily removed to the inside wall side.

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 When the fan is switched off, an inflow of air, in particular of cold air, into the fan unit is avoided or prevented. 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 special ders space-saving design and thus achieve a particularly compact heat recovery device.

It can also be provided that is assigned to the fan insert on the outer wall side Page one the fan tray and the wall duct completely covering outer cover connects, the first opening for the Supply of fresh air into the fan tray and a second opening for the Discharge of exhaust air from the fan unit having, through a partition in one or two chambers of the outer cover are separated airtight, which are in lateral and in opposite Directions to the outside open, serving as an air inlet or as an air outlet openings exhibit. By doing so leaves One hundred percent air separation of outside air on the one hand and exhaust air on the other hand.

A such outer cover may preferably be made of stainless steel.

Further can be provided that the outer cover in a longitudinal axis of the fan tray cutting plane containing a circular segment-shaped cross-section with a convex to the outside domed surface having. The outer cover may preferably be in a direction perpendicular to the aforementioned cross-section standing straight or be designed with straight outer edges, so that the outer cover a cylindrical outer shape with a circular segment Cross section may have. Such outer cover is particularly sufficient advantageous to the increasing requirements with regard to an advantageous air duct as well as stability and convinced also by a particularly shapely outside shape.

Further Advantages, features, details and aspects of the invention The following description part can be removed, in which an advantageous embodiment the invention is described in detail with reference to the figures.

It demonstrate:

1 a three-dimensional view of a heat recovery device with longitudinal section;

2 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 1 ;

3.1 a three-dimensional representation of a wall duct, which consists of three stacked wall rings;

3.2 a side view of the wall duct according to 3.1 ;

3.3 a side view of one of the wall rings of the wall duct according to 3.1 whose inner edges are indicated by broken lines;

3.4 a front view of the a round outer cross-section having wall duct according to 3.1 ;

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

4.2 a plan view of the reinforcement insert according to 4.1 , without representation of the wall rings;

4.3 a side view of the reinforcement insert according to 4.1 with an upstanding support for a spirit level, without showing the wall rings;

4.4 a front view of the reinforcement insert according to 4.1 , without representation of the wall rings;

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

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

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

5.4 a front view of the structure foam body according to 5.1 ;

5.5 a top view of the structure foam body according to 5.1 ;

6.1 a three-dimensional view of a substantial structural component of an inner cover;

6.2 a side view of the structural component according to 6.1 ;

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

6.4 one opposite the view of the in 6.2 rotated 90 degrees side view of the structural component according to 6.1 ;

7.1 a side view of a Außenab cover;

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

7.3 a greatly enlarged view of a section of the outer cover according to 7.1 ,

That in particular in the 1 and 2 in different sectional images shown decentralized heat recovery unit 20 includes a fan tray 25 into a tubular wall duct 23 is used, in turn, like out 2 seen in a wall opening 21 a wall 22 used or installed. Both the wall duct 23 as well as the fan insert 25 are each separately handled before their installation.

The wall duct 23 consists here of three successive mounted round wall rings, with an outer radius 72 or with an outer diameter 73 ( 3.2 and 3.4 ) are designed. The wall ring 37 is suitable and intended, in a round wall opening 21 be used, for example, as a so-called core drilling easily and quickly in a wall 22 can be realized.

Every wall ring 37 ; 37.1 . 37.2 . 37.3 points here at one of his forehead ends 38.2 Insertion and centering elements 39.1 . 39.2 . 39.3 on, which extend over a certain circumferential angle over the Stirnumfang. In this case, comparatively narrow first insertion and centering elements 39.1 provided, which are each arranged radially outboard. Furthermore, in each case between these first insertion and centering 39.1 wider second and third insertion and centering elements 39.2 and 39.3 provided, which thus extend over a relatively larger circumferential angle and which are each arranged radially inwardly.

Every wall ring 37 ; 37.1 . 37.2 . 37.3 points to his other front end 38.1 to the plug-in and centering elements 39.1 . 39.2 . 39.3 appropriately designed recording elements 40.1 . 40.2 . 40.3 for these plug-in and centering elements 39.1 . 39.2 . 39.3 on. The recording elements 40.1 for the insertion and centering elements 39.1 are each designed as radially outwardly open grooves. The recording elements 40.2 and 40.3 for the insertion and centering elements 39.2 and 39.3 are each designed as radially inwardly open grooves. In this way, the successive plugged wall rings 37.1 . 37.2 . 37.3 centered relative to each other and positively connected and rotationally fixed to each other.

The wall rings 37 ; 37.1 . 37.2 . 37.3 consist 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 Here are each designed identically, so that any multiple combination of successively and successive attachable wall rings 37 is feasible. The individual wall rings 37.1 . 37.2 . 37.3 here have an identical length 80. Like also in 3.2 is shown 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 visible while the remaining wall rings 37.1 . 37.2 then only with one of the height of the nested insertion and centering 39.1 . 39.2 . 39.3 reduced length 54 are visible.

According to a preferred embodiment, the not yet nested 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 outside length 54 of about 111, 5 mm.

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

For the purpose of a shell assembly of the wall bushing 23 in the wall breakthrough opening 21 gets into the wall duct 23 a stiffening and in cross-section cross-shaped reinforcing insert 41 made of plastic, preferably made of polystyrene, as for example in 4.1 is indicated. The cruciform reinforcing insert 41 here is four plate-like wall parts 42.1 . 42.2 . 42.3 . 42.4 designed, 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 reinforcing insert 41 has at its inside front end 43.1 and on its outside, facing away from the front end 43.2 , one each cleaning cover 44.1 . 44.2 made of plastic, preferably made of polystyrene. Every plaster cover 44.1 . 44.2 has four cross-shaped recesses and mutually offset at a circumferential angle of 90 degrees to each other 45.1 . 45.2 . 45.3 . 45.4 on, for receiving suitably shaped end pieces 46.1 . 46.2 . 46.3 . 46.4 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 positively in the respective recesses 45.1 to 45.4 the two plaster covers 44.1 and 44.2 are attached.

Like from the 4.1 to 4.3 can be seen on the side of the inner plaster cover 44.1 two of the oppositely arranged tails 46.1 and 46.3 designed longer than the other two tails 46.2 and 46.4 , The said tails 46.1 and 46.3 each stand over the outer surface 47 of the interior plaster cover 44.1 also in front and have parallel to each other and aligned bearing surfaces 48.1 and 48.2 on. On these bearing surfaces 48.1 and 48.2 can for the purpose of a correct installation of the wall bushing 23 put on a spirit level. Because of the reinforcing insert 41 in his in the with the wall rings 37 formed wall duct 23 inserted condition with the wall rings 37 positively and / or positively connected, can now by turning the reinforcing insert 41 together with the wall duct 23 the latter are positioned in the correct position with the aid of the spirit level, so that subsequently after inserting or inserting the fan insert 25 in the wall duct 23 the fan tray 25 with its components also in the correct position in the wall opening 21 the Wall 22 is positioned.

The fan application 25 comprises a chassis-like molded body, here as one of two half-shells 50.1 and 50.2 formed foam body 49 is designed (see 5.1 to 5.5 ). The foam body 49 consists here 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-cell 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, in particular from the 5.1 . 5.3 and 5.4 can be positively connected to one another via interlocking fixation and centering, in the embodiment shown in parallel to the longitudinal axis of the wall bushing 23 extending longitudinal edges 51.1 ; 52.1 . 52.2 , Every half shell 50.1 and 50.2 has a length 53 ( 2 ), which are essentially the length 54 the wall duct 23 equivalent.

In the embodiment shown, all are 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 external closures 62 , the two air filters 24.1 and 24.2 , a control board 70 , the wires and a power connector 71 or a power connector socket form-fitting in the fan tray 25 limiting foam body 49 embedded and carried by this (see 1 and 2 ).

When fully assembled, the fan tray includes 25 from its the inner wall surface 29 associated side to the outer wall 30 associated side considered two separate air filters 24.1 . 24.2 Here, using a Velcro strip easily and quickly manually on the outer surfaces of an aluminum cross-heat exchanger 26 are releasably secured again.

To the heat exchanger 26 , Concretely, at the other two, also at an angle of about 90 degrees to each other standing outer surfaces, each associated with this two close 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 on that with an electric motor 31 are drivable.

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 33 ,

A first fan 33 who in 2 shown on the top left, serves to air from the outside wall side 33 through an air duct 28 through the heat exchanger 26 through to the inner wall side 29 towards the purpose of aeration of one of the wall 22 limited space 81 to promote while the other fan 23 who in 2 Bottom left, serves to air from the inside wall side 29 through the heat exchanger 26 through to the outside wall side 30 towards the purpose of venting the room 81 to promote.

In the area of the heat exchanger 26 Thus, the two cross each other through the two fans 33 promoted air flows, which is why we speak in the present case of a cross-heat exchanger.

As in particular from the 1 and 2 it can be seen on the inside wall side 29 of the fan tray 25 associated side a the fan tray 25 and the wall duct 23 and also the wall opening 21 completely covering inner cover 55 intended. This is there manually, tool and screw-free and releasably secured. For this purpose, the inner cover 55 , their shaped body 82 in different views in the 6.1 to 6.4 shown is in the fan tray 25 inwardly extending fastening body 57 on. These have in the area of their inward-facing free ends 58 transversely outwardly extending locking lugs 59 in recesses 61 in the inner wall of the foam body 49 or the half-shells 50.1 . 50.2 engage. Consequently, the inner cover 55 with her molding 78 using only the foam body 59 of the fan tray 25 attacking fasteners manually, tool and screw-free and releasably secured. As a result, the inner cover can be easily and quickly assembled manually without tools and manually disassembled, resulting in a quicker and easier manual filter change 24.1 . 24.2 is possible.

The inner cover 55 consists of a the fastening body 57 having molded body 82 and a thin outer lining 79 , The latter limits the through the molding 82 formed air chambers and is with lateral outlets or inlets for a discharge 35 of spent air from the room 81 or for a feed 36 designed by heated fresh air ( 2 ).

As also in particular from the 1 and 2 can be seen, joins the fan tray 25 on the outer wall side 30 associated side, one the fan tray 25 and the wall duct 23 as well as the wall opening 21 completely covering outer cover 78 at. This is in their special design in different views and enlargements in the 7.1 to 7.3 shown. The outer cover 78 has on its underside a first opening 62.1 on which the in 2 fan shown above left 33 for the supply of fresh air in the fan tray 25 is assigned, and has a second opening 62.2 on the in 2 bottom left illustrated fan for the discharge 35 of exhaust air from the fan tray 25 assigned.

The openings 62.1 and 62.2 are through a partition 63 under formation of two chambers 64.1 and 64.2 inside the outer cover 65 airtight from each other. These two chambers 64.1 , and 64.2 each have a laterally open in opposite directions, as an air inlet 65 or air outlet 66 serving openings. These lateral openings, of which in 7.1 an opening is shown, preferably with a fly screen 67 Mistake.

The outer cover 78 is by using four recesses here 68 pluggable fixing screws on the outer wall releasably fastened.

Below is a brief summary of the functional description of the heat recovery device according to the invention 20 :
The heat recovery unit 20 is a decentralized wall-mounted unit for controlled ventilation with integrated heat recovery. The heat recovery unit 20 brings fresh, filtered air, depending on requirements with filter class G 4 or via a pollen filter F 7 draft-free into a room 81 and at the same time carries out the used air there (arrow 35 in 2 ). Using the heat recovery unit 20 So a comfortable room climate can be created without having to open windows.

In the internal aluminum cross heat exchanger 26 the heat of the spent air is stored and delivered without contact to the fresh air supplied from the outside, which is then filtered in the room 81 is available (arrow 36 in 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, can be with the help of the heat recovery device 20 save significant amounts of energy because the windows no longer need to be opened uncontrollably.

Due to the practical efficiency of the heat exchanger 26 a possible icing of the device is prevented. Two very tight electrically operated lamellar outer closures 62 with slats 84 (please refer 1 and 2 ) for the outdoor and exhaust air prevent the inflow of cold air when the heat recovery unit is switched off 20 , All mechanical or electrical components of the heat recovery unit 20 are from the room or inside wall side 29 easy to reach. Consequently, this decentralized heat recovery wall unit is also ideal for multi-storey housing.

The round wall duct 23 Made possible by a simple and inexpensive in a wall 22 manufacturable core drilling a quick, easy, cost-effective and tool and screw-free manual installation in the wall 22 , The wall duct 23 is standard for reinforcement with a reinforcement insert formed as a styrofoam cross 41 and against contamination of the interior with two cleaning lids 44.1 . 44.2 executed. A connection cable 230 Volt / 50 Hz is inserted into the provided bushing. A shapely stainless steel outer cover 78 , 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 application 25 with fans 33 , Heat exchanger 26 and electronics (radio and control board 70 as well as plug connection 71 ; Figure 1) is in the prepared sleeve-like wall bushing 23 inserted and then electrically connected with an electrical connector / coupling connection. The plug connection 71 gets into the foam body 49 inserted and inserted into the prepared opening there.

The inner cover 55 with its preferably made of EPP (expanded polypropylene) moldings and with their outer lining 79 made of a sturdy plastic, with its locking lugs 59 having fastening bodies 57 in the recesses 61 or clicks on the fan insert 25 pressed. A screw fastening is not necessary. Consequently, the inner cover 55 manually and without tools quickly and easily assembled and disassembled, which also makes 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 82 (See arrow 35 in 2 ) and a second filter 24.2 in the supply air (see arrow 36 in 2 ). Both filters 24.1 and 24.2 can easily from the wall inside 29 be serviced. If necessary, pollen filters can also be used. Two energy-saving DC voltage electric motors 33 Long-life ball bearings and intelligent soft-commutation meet the requirements of such a heat recovery unit 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 the functions required by the most recent standards. So if one of the DC motors 31 fails, automatically becomes the other DC motor 31 off. Is the heat recovery unit 20 not active, ie switched off, closes the electric lamella outer closure 62 the two air channels 28 to the outside wall side 30 down tight. 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 can be up to five heat recovery devices 20 be controlled. By means of the radio hand transmitter, a timer for the monitoring of the filters 24.1 . 24.2 be set arbitrarily. All functions are displayed in the radio hand transmitter in a display.

The The following list represents an important part of the description represents:

20

Heat recovery unit

21

Wall through opening

22

wall

23

Wall bushing

24.1

air filter

24.2

air filter

25

fan tray

26

heat exchangers

27

Shut-off

28

Air duct

29

Inner wall side

30

Outer wall side

31

electric motor

32

fan blades

33

fan

34

Fresh air

35

removal of spent air

36

supply of warmed up air

37

wall ring

37.1

wall ring

37.2

wall ring

37.3

wall ring

38.1

Forehead of 37

38.2

Forehead of 37

39.1

male and centering element

39.2

male and centering element

39.3

male and centering element

40.1

receiving element

40.2

receiving element

41

reinforcement insert

42.1

wall part

42.2

wall part

42.3

wall part

42.4

wall part

43.1

Forehead of 41

43.2

Forehead of 41

44.1

cleaning cover (Inner cover lid)

44.2

cleaning cover (Outer cover lid)

45.1

recess

45.2

recess

45.3

recess

45.4

recess

46.1

Tail of 42.1

46.2

Tail of 42.2

64.3

Tail of 42.3

64.4

Tail of 42.4

47

Outer surface of 44.1

48.1

area

48.2

area

49

foam body

50.1

half shell

50.2

half shell

51.1

Longitudinal edge of 50.1

51.2

Longitudinal edge of 50.2

53

length of 50.1 . 50.2

54

length of 37

55

undercover

56

fastener

57

mounting body

58

free end of 57

59

locking lug

60

Inside wall of 25 . 49

61

recess

62

outside closure

62.1

first opening

62.2

second opening

63

partition wall

64.1

chamber

64.2

chamber

65

air intake

66

air outlet

67

Flyscreens

68

recess

70

Wireless- and tax

circuit board

71

connector

72

outer radius

73

outer diameter

74

lamella

75

wall thickness

76

decoupling body

77

fold

78

outer cover

79

Siding

80

length of 37

81

room

82

moldings

Claims (23)

Heat recovery unit ( 20 ), which is suitable for installation in a wall opening ( 21 ) a wall ( 22 ) by means of a separate handle before installation and in the wall opening ( 21 ) usable wall duct ( 23 ) is suitable and intended, with one in the wall bushing ( 23 ) insertable fan insert ( 25 ), which has a heat exchanger ( 26 ), a shut-off device ( 27 ) for selectively closing or opening an air duct ( 28 ) between an inner wall side ( 29 ) the Wall ( 22 ) and an outer wall side ( 30 ) the Wall ( 22 ) and one by means of an electric motor ( 31 ) driven fan blades 32 having fan ( 33 ), by means of the 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 versa, for loading and / or venting one of the wall ( 22 ) limited space ( 81 ), whereby the wall duct ( 23 ) with a substantially round or as a substantially round wall ring ( 37 ; 37.1 . 37.2 . 37.3 ), which is suitable and intended, into the preferably round wall opening ( 21 ) to be used. Heat recovery device according to claim 1, characterized in that the wall duct ( 23 ) with several aufeinanderbaren, essentially round wall rings ( 37.1 . 37.2 . 37.3 ) is designed. Heat recovery device according to claim 2, characterized in that each wall ring ( 37.1 . 37.2 . 37.3 ) on one of its front ends ( 38.2 ) or at both of its ends facing away from each other ( 38.1 . 38.2 ) Insertion and centering elements ( 39.1 . 39.2 . 39.3 ) and at its other front end ( 38.1 ) or at its two front ends ( 38.1 . 38.2 ) matching receiving elements ( 40.1 . 40.2 ), so that the front side stacked wall rings ( 37.1 . 37.2 . 37.3 ) are centered relative to each other and positively connected and rotatably connected to each other. Heat recovery device according to one of claims 1 to 3, characterized in that for the purpose of a shell assembly of the wall bushing ( 23 ) in the wall breakthrough opening ( 21 ) in the wall duct ( 23 ) a stiffening and in cross-section cross-shaped reinforcing insert ( 41 ) made of plastic, preferably made of polystyrene, is used, in the region of its two front ends ( 43.1 . 43.2 ) each a plaster cover ( 44.1 . 44.2 ) made of plastic, preferably made of polystyrene. 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 ), into the end pieces ( 46.1 . 46.2 . 46.3 . 46.4 ) of the cruciform reinforcing insert ( 41 ) spaced form-locking engage each other. Heat recovery device according to claim 5, characterized in that at least two of the end pieces ( 46.1 . 46.3 ) over the outer surface ( 47 ) of the plaster cover ( 44.1 ) protrude. Heat recovery device according to one of claims 1 to 6, characterized in that the heat exchanger ( 26 ) and the fan ( 33 ) in a form fit in a fan tray ( 25 ) in the circumferential direction limiting foam body ( 49 ) are embedded and carried by a thermoplastic material. Heat recovery device according to one of claims 1 to 7, characterized in that all essential for the loading and / or ventilation components form fit in a fan tray ( 25 ) in the circumferential direction limiting foam body ( 49 ) are embedded and carried by a thermoplastic material. 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 in a form fit in the fan tray ( 25 ) in the circumferential direction limiting foam body ( 49 ) are embedded and carried by a thermoplastic material. Heat recovery device according to one of claims 1 to 9, characterized in that all of its operation as such essential components form fit in a the fan tray ( 25 ) in the circumferential direction limiting foam body ( 49 ) are embedded from a thermoplastic and worn by this. Heat recovery device according to one of claims 7 to 10, characterized in that the foam body ( 49 ) of at least two interconnectable shells ( 50.1 . 50.2 ) consists. Heat recovery device according to claim 11, characterized in that the foam body ( 49 ) of two interconnectable half-shells ( 50.1 . 50.2 ) consists. 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. Heat recovery device according to one of claims 11 to 13, characterized in that the shells ( 50.1 . 50.2 ) parallel to the longitudinal axis of the wall duct ( 23 ) extending longitudinal edges ( 51.1 . 51.2 ; 52.1 . 52.2 ) are connected to each other. Heat recovery device according to one of claims 11 to 14, characterized in that each shell ( 50.1 . 50.2 ) a length ( 53 ) substantially the length (54) of the wall ring ( 37 ) or several or all of the wall rings ( 37.1 . 37.2 . 37.3 ) corresponds. Heat recovery device according to one of claims 7 to 15, characterized in that the foam body ( 49 ) consists of EPP (expanded polypropylene). Heat recovery device according to one of claims 1 to 16, characterized in that on the fan unit ( 25 ) and / or on the wall bushing ( 23 ) on whose or the inner wall side ( 29 ) associated side a the fan tray ( 25 ) and the wall duct ( 23 ) Inner cover completely covering the front side ( 55 ) is manually, without tools or screws and releasably secured. Heat recovery device according to claim 17, characterized in that the inner cover ( 55 ) manually, without tools and screw-free as well as detachable by means of preferably exclusively on the fan tray ( 25 ) engaging fasteners ( 56 ) is attached. Heat recovery device according to claim 18, characterized in that the inner cover ( 55 ) using only on the foam body ( 49 ) of the fan tray ( 25 ) engaging fasteners ( 56 ) is attached. Heat recovery device according to one of claims 18 or 19, characterized in that the inner cover ( 55 ) into the fan tray ( 25 ) inwardly extending fasteners ( 57 ), which in the region of their inwardly pointing free ends ( 58 ) transversely outwardly extending locking lugs ( 59 ), which on an inner wall ( 60 ) of the fan tray ( 25 ) engage frictionally and / or provided there recesses ( 61 ) engage positively. Heat recovery device according to one of claims 1 to 20, characterized in that the fan ( 33 ) at least through the heat exchanger ( 26 ) from the inner cover ( 55 ) and to this to the outer wall side ( 30 ) offset in the fan tray ( 25 ) is arranged. Heat recovery device according to one of claims 1 to 21, characterized in that towards the inner wall side ( 29 ) in front of the fan ( 33 ) with a plurality of tightly closable lamellae ( 74 ) configured and preferably electrically from an open position to a closed position and vice versa operable outer closure ( 62 ) is arranged. Heat recovery device according to one of claims 1 to 22, characterized in that the fan insert ( 25 ) on the outer wall side ( 30 ) associated side a the fan tray ( 25 ) and the wall duct ( 23 ) completely covering outer cover ( 78 ), which has a first opening ( 62.1 ) for the supply of fresh air into the fan tray ( 25 ) and a second opening ( 62.2 ) for the removal of exhaust air from the fan tray ( 25 ), which by a partition ( 63 ) with the formation of chambers ( 64.1 . 64.2 are air-tight, which open in lateral and in opposite directions to the outside, as an air inlet ( 65 ) or as an air outlet ( 66 ) serving opening have gene.