EP3147582A1 - Noise damping enclosure - Google Patents

Abstract

The invention relates to a sound-absorbing housing for accommodating at least one heat exchange device (6), preferably an air conditioning or refrigeration device or a heat pump, with an interior (2), an outer shell (1) and at least one intake opening (3,4) for the inlet of fresh air into the interior (2) and at least one exhaust opening (5) for the outlet of exhaust air from the interior (2). In order to enable an improved damping of the sound emitted by the heat exchange device, the invention provides for a disk pack (7, 8,26) is provided, wherein at least two adjacent lamellae of the lamellae (7,8,26) each have a reflection surface and an absorption surface and the reflection surface of the first lamella is arranged opposite to the absorption surface of the subsequent lamella, each lamella at least one kink or has a bend so that a sound wave arising in the interior (2) hits the absorption surface at least once between entry into the disk pack (7, 8, 26) and exit from the disk pack (7, 8, 26).

Description

FIELD OF THE INVENTION

The invention relates to a sound-absorbing housing for accommodating at least one heat exchanger, preferably an air-conditioning or refrigerating appliance or a heat pump, in an interior of the soundproofing housing,
wherein the sound insulation housing comprises an outer shell which limits the interior,
wherein the outer shell has at least one intake opening for the inlet of fresh air into the interior and at least one exhaust opening for the outlet of exhaust air from the interior.

STATE OF THE ART

Heat exchangers, such as air conditioners, refrigerators or heat pumps, are used for example in the building air conditioning technology, for example, for controlling the temperature of indoor spaces, or in the field of geothermal energy. In this case, generic heat exchange devices always have at least one compressor or a condensing unit containing the compressor. In order to allow heat exchange with the environment or to be able to suck in fresh air to cool the heat exchanger and to blow out heated exhaust air, it is often necessary that the heat exchangers are installed outdoors to allow access to fresh air. In order to protect the heat exchangers on the one hand from the effects of weather and on the other hand to reduce the radiated from the heat exchangers sound, according to the prior art sound insulation are known enclosing enclosing the heat exchangers. For this purpose, the sound insulation housing on an outer shell, which is usually made of sheet metal and is cuboid, wherein the outer shell defines an interior, in which interior space the heat exchange device is arranged. The inner surfaces of the outer shell, so the interior facing surfaces, are conventional manner provided with a sound-absorbing insulating layer, which occupies a large part of the inner surfaces.

The outer shell is usually prismatic, preferably with a rectangular plan, and therefore comprises an upper top wall and a lower top wall, the lower top wall usually also serves as a footprint. In addition, the outer shell comprises a jacket consisting of several side walls. In the case of a cuboid outer shell, the jacket thus consists, for example, of four side walls. According to the prior art, it is customary to arrange the heat exchange device in the center of the sound-absorbing housing and to redirect the air streams by means of several baffles snail-shaped in order to achieve a sound-damping effect.

In order to allow the intake of fresh air into the sound-absorbing housing, the outer shell of the sound-absorbing housing has at least one suction opening, wherein the suction opening is generally formed in the region of the lateral surface. Likewise, the outer shell has at least one exhaust opening, via which the exhaust air originating from the heat exchange device can escape from the sound insulation housing. In particular, in the above-mentioned sound insulation with snail-shaped air duct, the suction port and the exhaust port are arranged in the edge region of the side walls and usually take only a small part of the shell of the sound insulation housing in order to achieve the greatest possible deflection. In addition, the free area of the suction and exhaust opening is often - for example due to covers, such as perforated plates - further reduced, which further deteriorates the flow conditions by a too small free area in relation to the heat exchanger surface.

However, a decisive disadvantage of the sound insulating housing known according to the state of the art is that through the openings in the outer shell the sound or noise produced during operation of the heat exchanger passes through the openings to the outside and thus the total sound absorption is significantly reduced. Thus, the unpleasant effect that during operation of the heat exchange device, a part of the operational noise or the operating noise passes to the outside and so outside people are exposed to noise pollution by the heat exchange device. Another disadvantage of the prior art is that greatly increases the flow resistance by the deflection of the air currents. Since the performance of the built-in heat exchangers fans is usually designed for the free intake or blowout, it may come through the sound insulation according to the prior art to an air dam in the sound insulation and in consequence to a significant deterioration of the original performance (without Schalldämmgehäuse) of the heat exchanger and to increased energy consumption.

OBJECT OF THE INVENTION

It is therefore an object of the present invention to overcome the disadvantages of the prior art and to propose a sound absorbing housing for receiving at least one heat exchange device, which allows for improved damping of the sound emitted by the heat exchange device and thus the noise pollution is minimized by the exiting sound. A further object of the invention is to improve the air flows in the soundproofing housing in order to avoid an air accumulation in the soundproofing housing.

PRESENTATION OF THE INVENTION

These objects are embodied in a soundproofing housing according to the invention for accommodating at least one heat exchange device, preferably an air conditioning or refrigeration device or a heat pump, in an interior of the sound insulation housing, wherein the sound insulation housing comprises an outer shell which delimits the interior, the outer shell having at least one suction opening for the admission of fresh air into the interior and at least one exhaust opening for the outlet of exhaust air from the interior, characterized solved that a the at least one suction opening and / or the at least one exhaust opening overlapping and a plurality of lamellae comprehensive lamellar package is arranged in the region of the suction port and / or in the region of the exhaust opening, wherein at least two adjacent lamellae of the lamella packet each having a reflection surface and an absorption surface and the reflection surface of the first lamella is arranged opposite to the absorption surface of the subsequent lamella, each lamella having at least one kink or bend, so that a sound wave emerging in the interior and propagating in a propagation direction at least occurs between entry into the lamella packet and exit from the lamella packet hit the absorption surface once.

In order to improve the air flow through the sound-absorbing housing, no air-flow deflecting elements are provided in the interior of the sound-absorbing housing, so that the intake opening and the exhaust opening for improved intake or blow-out can each occupy a significant proportion of the side walls or the cover walls. A deflection of the air flow through the Schalldämmgehäuse takes place only in the disk pack due to the shape of the slats. The air flow can propagate in the interior of the sound-absorbing housing, away from the disk pack or toward the disk pack, in a straight line, in particular in the same axis. Due to the large intake opening or exhaust opening, part of the sound waves produced in the sound insulation housing could now escape from the sound insulation housing via the openings without being damped. To prevent this effect and to attenuate the radiated sound, the intake port and the exhaust port are each covered by a disk pack to reduce the sound emission of passing through the intake and exhaust opening sound waves by the sound is partially absorbed. It is advantageous if each inlet opening or each outlet opening is assigned a corresponding, the respective opening overlapping plate pack. The disk packs are included arranged such that the sound must pass between the slats before leaving the sound-absorbing housing. In other words, the inlet opening and the outlet opening are closed by the disk set, wherein between the slats forms a free space through which an air flow can be transported through the disk set. If the outer shell is cuboid-shaped, two types are particularly advantageous: in one type, which is referred to in the sequence with vertical blow-out, the at least one suction opening is formed in a side wall, wherein it is also conceivable, the suction on two, three or four side walls are formed. The at least one blow-out opening is formed in the vertical blow-out on the upper top wall. In the other type, hereinafter referred to as horizontal blow-out, both the blow-out opening and the suction opening are each formed in a side wall. Preferably, the discharge opening and the suction opening are formed on opposite sides, but it is also conceivable that up to three side walls have a suction opening.

The particularly high noise insulation is achieved by the special design of the individual slats of a disk set. Each lamella has a reflection surface and an absorption surface, which are preferably formed on opposite sides of a lamella. The lamellae are arranged in such a way in the disk set, that in each case the reflection surface of the first lamella and the absorption surface of the subsequent lamella face each other. If a sound wave produced in the interior now strikes the reflection surface of the first lamella, it is reflected onto the absorption surface of the following lamella, depending on the entrance angle and propagation direction. At the absorption surface, a part of the sound wave is absorbed and the remaining part in turn reflected on the reflection surface. The more often the sound wave strikes the absorption surface, the larger it is the total absorbed portion of the sound wave and the lower the emitted sound.

Since a sound wave propagates spherically, infinitely many different propagation directions are conceivable. In order to prevent that in some propagation directions the corresponding sound wave through the disk pack can pass unhindered, without the sound wave once directly or indirectly - by reflection on the reflection surface - occurs on an absorption surface and is thus damped, have the slats - in profile seen - a kink or a bend on. By bending or bending arise at least two legs arranged at an angle to each other, so that a sound wave whose propagation direction is substantially parallel to the reflection surface on the first leg, meets the absorption surface of the second leg of the subsequent lamella. By such a design of the slats is ensured in a simple manner that a minimum absorption of the sound waves formed in the interior, which correspond to the operating noise of the heat exchanger in the operating state takes place. As a result of the design according to the invention, a much higher absorption can be achieved for a majority of the sound waves since these are reflected back and forth several times between the reflection surface and the absorption surface, a portion of the sound wave being absorbed at each reflection on the absorption surface. It is particularly advantageous if a partial absorption also takes place on the reflection surface, which is why the reflection layer can also be formed by a sound-insulating film. As a result of the repeated reflection and absorption, the sound radiation or the noise level of the heat exchanger is considerably reduced, so that heat exchangers can also be used in places with strict noise emission values or in locations where increased noise pollution is undesirable through the use of a soundproofing housing according to the invention.

An embodiment variant of the invention provides that the lamellae have a strip-shaped main body, in particular of sheet metal. Since strip-shaped bodies have a large surface area with low weight, a strip-shaped basic body is particularly well suited to the formation of the lamellae. The basic body also gives the necessary stability for the disk pack, in order to withstand environmental influences, and also serves to fasten the individual disks in the disk pack, for example to a frame of the disk pack. If the strip-shaped basic body is made of metal, in particular of sheet metal, then particularly good properties are achieved with regard to the strength and rigidity of the laminated core. However, it is equally conceivable that the body consists of weatherproof and optionally UVunempfindlichen plastic.

A particularly simple and cost-effective production of the lamellae is achieved when the reflection surface is formed by the base body. If the material of which the strip-shaped basic body is formed, as is the case with sheet metal for example, already has suitable properties for reflection of the sound waves, then it is no longer necessary to apply a reflection layer to the basic body. Thus, on the one hand, the manufacture of the lamellae is simplified and, on the other hand, the robustness and service life of the lamellae pacts are increased.

In order to achieve a high degree of absorption of the sound waves, a further embodiment of the invention provides that a foam layer, preferably of polyurethane foam (PUR foam), is attached to the base body, which foam layer forms the absorption surface on the surface facing away from the base body. The foam layer is open-cell and broadband sound insulation and thus has particularly good sound damping properties and can be attached to the body in a simple manner, such as by gluing, pressing or screwing. The foam layer is connected on one side to the base body; on the opposite side of the foam layer forms the absorption surface. Preferably, therefore, one side, such as the upper side, of the lamellae forms the reflection surface, while on the opposite side, ie, in this case the underside, of the lamella, the foam layer forming the absorption surface is applied. The foam layer preferably has an NRC (noise reduction coefficient) according to DIN EN ISO 11654 of between 0.75 and 0.95, in particular 0.8 or 0.9, and / or a sound absorption value αs according to DIN 20354 of at least 0 , 8 from a frequency of 630 Hz, preferably from 315 Hz.

In order to protect the foam layer from the effects of weathering, such as rain, hail or storm gusts, or to reduce the risk of damage to the foam layer by mechanical force from the outside, provides a further embodiment of the sound insulation according to the invention that the base encloses the foam layer, wherein at least the Absorption surface remains free. Due to the fact that the base body encloses or surrounds the foam layer at least in the end regions of the lamella, the absorption surface remains free. It is thereby prevented that liquid, such as rainwater, can penetrate laterally into the foam layer, ie into that region of the foam layer which lies between the absorption surface and the surface of the base body. The enclosing portion of the main body can form, for example, a rectangular receiving portion for the foam layer, wherein it is advantageous if the edges of the receiving portion are rounded to reduce the turbulence of entering or exiting the soundproof housing air flow when passing.

Since the absorption surface, for example, by splash water or condensation, with liquid, especially water, can come into contact, it makes sense to protect the foam layer from penetrating or soaking with liquid. Therefore, in a further embodiment of the invention, it is provided that the Foam layer is protected at least in the region of the absorption surface by a dirt and water-repellent film. The foam layer is thus sealed by the water-repellent film on the absorption surface. For this purpose, the dirt- and water-repellent film may be coated, for example, with a microporous PUR film, wherein the usual way the foam layer is coated during its production with the water-repellent film.

For absorption or insulation of low frequencies and body sound propagating in the lamellae, a preferred embodiment of the invention provides that the lamella comprises a layer, in particular arranged between the base body and the foam layer, with increased density relative to the base body. The layer with increased density may be, for example, a metallic foil, such as a lead-containing heavy foil or an elastomer-modified bituminous foil, which is attached directly to the main body or to the foam layer, for example glued. The attachment of the foam layer takes place on the body at least partially through the layer with increased density.

A further preferred embodiment provides that in each case at least two adjacent lamellae in one of the disk packs are spaced apart from each other normal to a flow direction of the disk set of the sucked or blown air and overlap each other in the flow direction at least in sections. The flow direction is generally rectilinear and corresponds to that imaginary line between entry of the air flow into the disk set and exit of the air flow from the disk set. The slats extend parallel to the respective side wall or top wall and thus normal to the flow direction. The individual fins are spaced apart, namely normal to the flow direction and normal to the direction of extension of the fins. Since the fins are arranged so that they overlap each other despite the complaint of each other, no sound wave emerge from the soundproofing housing without prior damping. Under overlapping is to be understood that the kink or the bend of the first blade is disposed within the volume formed by the legs of the subsequent lamella. In other words, therefore, are the ends of the legs of the subsequent blade in the direction in which they are spaced apart, lower than the kink or the bend of the first blade. By the appropriate design of the slats, in particular by the dimensioning of the distance between the individual slats, thus the required amount of air can be sucked or blown through the disk pack, without the sound produced in the interior passes undamped to the outside.

It is particularly preferred in this case if all lamellae of a lamella packet are identically constructed and are arranged either vertically above one another or horizontally next to one another. In other words, the edges or bends of all slats not only parallel to each other, but lie in a plane which is normal to the flow direction. At the same time, the lamellae of the lamella packet are also aligned so that the reflection surfaces or absorption surfaces of the corresponding legs of all lamellae run parallel to one another. The slats are thus aligned in the same direction. Therefore, a further preferred embodiment of the invention provides that all lamellae of a disk set are aligned in the same direction.

A cost-effective production of the edge or bending of the slats, for example by a bending process or an extrusion process, is achieved when the lamellae have a V-shaped cross section, with legs of equal length or different lengths. The angle between the two legs of the lamella can be between 30 ° and 150 °, in particular between 45 ° and 135 °, preferably between 60 ° and 120 °, particularly preferably between 75 ° and 105 °. In a preferred embodiment, the angle is approximately 90 °, which on the one hand causes reduced dimensions in the direction of flow and on the other hand a efficient overlap of the slats allows. It is just as conceivable that the edge formed by the V-profile is rounded or formed as a bend.

In order to prevent the mixing of sucked air flow and blown air flow, in a particularly preferred embodiment of the invention, it is provided that a flexible air-impermeable separating part is attached to the suction opening and / or to the discharge opening, which consists of a plastic film and is designed such that the air sucked in by the heat exchanger and the air blown out by the heat exchanger do not mix. Such a separating part divides a blow-out space, ie the area between the blow-off opening and the blow-out side of the heat exchanger, from the rest of the interior, so that the heated blow-out air and the fresh air drawn in do not mix with one another. This prevents swirling of the air streams and at the same time prevents heating of the fresh air, so that the overall efficiency of the heat exchanger improves. The plastic film is on the one hand in a simple manner to the outer shell airtight fastened, for example via terminal, magnetic, Velcro, zipper, cable or screw, and on the other hand inexpensive to produce. Since the plastic film can not pass on structure-borne noise, there is generally no increased sound radiation through the separating part. In particular, suitable plastic films are also highly weather resistant, so that the use in outdoor areas is possible.

In particular, if the sound-absorbing housing and the outlet side of the heat exchange device are rectangular, it has proven to be advantageous for the separating part to have a substantially rectangular cross-section which, starting from the outer sheath, tapers inwards at least in sections. The taper is necessary because the cross-sectional area of the exhaust opening is usually larger than the area of the outlet side of the heat exchanger. The rectangular cross section is in a plane normal to To recognize flow direction. In the tapered section between the heat exchange device and the blow-out opening, the separating part is substantially truncated pyramid-shaped or the cross-section of the separating part is trapezoidal in a plane parallel to the flow direction. It is advantageous, for example, when the tapered portion is arranged between two prismatic sections. By the combination of a prismatic portion in the region of the suction opening, whose cross-section is larger than the exhaust opening, and by the adjoining tapered portion whose smallest cross section corresponds approximately to the cross section of the heat exchange apparatus, the volume of the blow-out space bounded by the separation member can be maximized.

For easy and quick attachment of the separator to the heat exchanger, the separator to be attached to different heat exchangers without structural measures on the heat exchanger itself must be made is provided in a further particularly preferred embodiment of the invention that the separator a releasable locking mechanism for attachment has on the heat exchange device, such as by means of clamping, magnetic, Velcro, zipper, rope or screw. Such a closure mechanism may be formed for example by a tensioning cable, an expander rope or a Zurrseil, wherein the ends of the cables are fixable via a closure element. By means of a closure mechanism designed in this way, an end of the separating part which can be inverted over the heat exchanger device can be tightened and fixed in a simple manner, so that the end of the separating part placed over the heat exchanger is approximately airtight against the heat exchanger.

It goes without saying that a sound-absorbing housing according to the invention can be supplied and produced independently of the device located therein. It is therefore conceivable to arrange a plurality of devices in a sound insulation housing according to the invention, as long as the devices fresh air suck in and blow out exhaust air. However, the special sound-absorbing properties of the sound-absorbing housing are only perceptible in the operating state, ie when a device is arranged in the interior of the sound-absorbing housing and is in operation. Since heat exchangers, such as air conditioners, refrigerators or heat pumps, are often placed outdoors, and suck in large amounts of fresh air and blow out exhaust air again, it is advantageous if at least one heat exchange device is arranged in the interior of the sound-absorbing housing. Of course, two, three, four or even more heat exchange devices can be arranged within a sound-absorbing housing, if the dimensions of the outer shell are adjusted accordingly and the heat exchangers are positioned accordingly, for example in series or in the block. Therefore, the object set in the introduction is also achieved by a system comprising a system according to the invention Schalldämmgehäuse with at least one heat exchange device, which heat exchange device is arranged in the interior of the Schalldämmgehäuses that a suction side of the at least one heat exchange device directly opposite a suction opening overlapping disk set and / or a blow-out side of the at least one heat exchange device is directly opposite a disk pack covering an exhaust opening in order to achieve a free air flow between the disk packs and the at least one heat exchange device. The inventive arrangement of the heat exchange device in the soundproof housing, which is only possible by the sound-absorbing properties of the disk packs, the suction port (s) and the exhaust port (s) (es) may be formed over a large area to allow large amounts of air to pass at a relatively low static pressure drop. The heat exchangers, which are usually prismatic, in particular cuboid, are formed, are therefore positioned parallel to the side walls of the Schalldämmgehäuses, with a distance of 5-20cm, preferably 10cm, between disk set and Ausblasseite or suction side is usually complied with. If more than one suction opening is provided with only one suction side, then usually only one, preferably the one, is located larger in area, suction port of the suction side of the heat exchanger opposite, while sucked through the other intake air and is deflected by the heat exchanger to the suction side. If the heat exchange device has a plurality of suction sides, then each suction side can be arranged opposite to a suction opening.

An embodiment variant of the system according to the invention provides that a flexible separating part connects the at least one suction opening of the soundproofing housing to the suction side of the at least one heat exchanger and / or that a flexible separating part connects the at least one blowout opening of the soundproofing housing to the outlet side of the heat exchanger. The separating part made of plastic film serves, as already described above, to prevent the mixing of the sucked fresh air with the exhaust air blown out. On the one hand, this can be achieved by arranging the separating part on the exhaust air side, that is to say connecting the exhaust opening of the soundproofing housing to the outlet side of the heat exchange device approximately airtight. Equally, it is also conceivable that the separating part is mounted on the fresh air side and thus connects the suction opening of the sound-absorbing housing with the suction side of the at least one heat exchanger. Since usually more suction than exhaust openings are present, it is usually more economical to install the separator on the exhaust side in practice.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail with reference to exemplary embodiments. The drawings are exemplary and are intended to illustrate the inventive idea, but in no way restrict it or even reproduce it.

Fig. 1

eine Draufsicht eines ersten Ausführungsbeispiel des Schalldämmgehäuses mit vertikaler Ausblasung gemäß Linie CC aus Fig. 2;

Fig. 2

eine Schnittansicht des ersten Ausführungsbeispiels gemäß Linie AA aus Fig. 1;

Fig. 3

eine weitere Schnittansicht des ersten Ausführungsbeispiels gemäß Linie BB aus Fig. 1;

Fig. 4

eine Draufsicht eines zweiten Ausführungsbeispiels mit horizontaler Ausblasung gemäß Linie EE aus Fig. 5;

Fig. 5

eine Schnittansicht des zweiten Ausführungsbeispiels gemäß der Linie DD aus Fig. 4;

Fig. 6

eine schematische Darstellung des Aufbaus eines Lamellenpakets;

Fig. 7

eine schematische Darstellung des Aufbaus einer alternativen Ausführungsvariante einer Lamelle.

Showing:

Fig. 1

a plan view of a first embodiment of the silencer with vertical Ausblasung according to line CC Fig. 2 ;

Fig. 2

a sectional view of the first embodiment according to line AA Fig. 1 ;

Fig. 3

a further sectional view of the first embodiment according to line BB Fig. 1 ;

Fig. 4

a plan view of a second embodiment with horizontal blow out according to line EE Fig. 5 ;

Fig. 5

a sectional view of the second embodiment according to the line DD Fig. 4 ;

Fig. 6

a schematic representation of the structure of a plate pack;

Fig. 7

a schematic representation of the structure of an alternative embodiment of a blade.

WAYS FOR CARRYING OUT THE INVENTION

In FIG. 1 is a first embodiment of a sound insulation according to the invention shown. The sound-absorbing housing comprises an outer shell 1, which has an interior 2 (see Fig. 2 and 3 ) limited. The outer shell 1 has a rectangular plan and is cuboid, so that the outer shell 1 has an upper top wall, a lower top wall and four side walls. The side walls and top walls of the outer shell 1 are formed by sheet metal plates, preferably of sendzimir galvanized steel sheet, which is held by a frame construction, preferably made of profile frame, in particular anodized aluminum. The frame construction is usually made up of uprights and cross connectors, which are held together via non-positive connections, such as screws or clamp connectors. This results in a particularly simple construction of the outer shell 1, since it is completely dismantled and requires neither rivet nor welded joints. In the illustrated plan view, the upper cover wall of the outer shell 1 is shown transparent, so that the interior of the sound-absorbing housing can be seen, which will be discussed in more detail below. The outer shell 1 in this case has a plurality of intake ports 3,4,25, as well as an exhaust port 5, in the Figures 2 and 3 is apparent. FIG. 2 now shows a frontal view of the silencer housing in section. Through the two suction openings 3,4 in the side walls of the outer shell 1 fresh air can pass into the interior 2 or be sucked, with 5 exhaust air from the interior 2 pass through the exhaust port or can be blown. The third suction port 25 in the rear side wall is in FIG. 3 to see. In detail, the first suction port 3 is formed in the left side wall of the outer shell 1 and the second suction port 4 is formed on the right side wall opposite to the first suction port 3. In this case, the suction openings 3, 4 occupy a significant proportion of the area of the side walls, in the present case about 60%, the areal proportion of the suction openings 3, 4 on the side walls being in the range from 25% to 80%, preferably from 35% to 75 %, in particular from 40% to 70%, is conceivable. On the inner surfaces of the side walls, so those the interior 2 facing surfaces, a sound-insulating layer of foam is mounted, which absorb the sound formed in the interior 2 or dam. The blow-out opening 5 is formed in the upper cover wall, wherein the areal proportion of the upper cover wall corresponds to the above-mentioned conditions. It goes without saying that even in the front side wall, which can not be seen in the figure, a further suction port can be formed. It is also conceivable that a plurality of small intake openings are provided instead of a large intake opening.

The first exemplary embodiment is a sound-damping housing for the vertical blow-out, since the fresh air flows from the outside through the first intake opening 3 along a first, substantially horizontally oriented, flow-through direction 18, through the second intake opening 4 along a second, substantially horizontally oriented, Throughflow 19 and through the third suction port 25 along a third, also substantially horizontally oriented, flow direction 20 (see Fig. 3 ) gets into the interior 2 or is sucked. Here, the first and second flow direction 18,19 facing each other. The exhaust air formed in the interior 2 passes along a fourth, substantially vertical, flow-through direction 21 via the exhaust opening 5 in the upper top wall of the sound insulation housing or is blown out of this. The first, second and third flow directions 18, 19, 20 in each case form a right angle with the fourth flow direction 21.

In the interior 2 of the sound-absorbing housing is usually at least one heat exchange device 6, for example, an air conditioner, a refrigerator or a heat pump, which is cuboid in the present example. As in FIG. 1 illustrated, the heat exchange device 6 on three of its side surfaces in each case a suction side 6a, can enter through the fresh air into the heat exchange device 6. On the upper side of the heat exchanger 6, the outlet 6b of the heat exchanger 6 is formed, which blows out the heated exhaust air from the condensing unit in the present example via two fan units. The heat exchange device 6 is, as again in Fig. 2 to recognize, mounted on the lower top wall of the outer shell 1, wherein the lower top wall is formed, for example, as a condensate cup, in which advantageously a rubber mat is integrated to prevent the freezing of exiting the heat exchanger 6 leaking condensation and droning noises the condensate cup to diminish. In order to prevent the formation of frost entirely, it may be provided that heating elements are provided in the condensation water tray, for example a separate heating coil or a rubber mat designed as a heating mat. The heat exchanger 6 may additionally be fixed to cross struts of the frame structure of the outer shell 1.

During operation of the heat exchanger 6, fresh air is sucked in by the heating device 6 through the suction openings 3, 4, 25, which passes into the heat exchanger 6 via the suction sides 6 a. By taking place in the heat exchange device 6 refrigerant process in which, for example, a cooling medium Heat is withdrawn, thereby producing heated exhaust air, which is blown on the outlet side 6b, in the present case on the top of the heat exchanger 6 and escapes through the exhaust opening 5 from the Schalldämmgehäuse.

During operation of the heat exchange device 6 operating noise, such as compressors, rotating fans or electrical equipment, which is to be dammed as effectively as possible to minimize the radiated outward sound, so the externally perceptible noise pollution. While the insulating layer, which is known per se, helps to insulate the sound emitted by the outer shell 1 to the outside, lamella packages 7, 8, 9 are provided for the insulation of the sound waves passing through the suction openings 3, 4, 25, and the suction openings 3 , 4.25 cover. In this case, a first plate pack 7 at the first intake port 3, a second disc pack 8 at the second intake port 4 and a third disc pack 9 at the third intake port 25 (see Fig. 3 ) arranged. Each disk set 7,8,9 comprises a plurality of fins 10, which are aligned in the same direction and are arranged normal to the respective flow direction 18,19,20, ie in the vertical direction, spaced from each other. The individual disks 10 of a disk set 7, 8, 9 are held in a frame 24, the frame 24 also serving to fasten the disk sets 7, 8, 9 on the side walls of the outer casing 1. The disk packs 7, 8, 9 are in this case attached to the intake openings 3, 4, 25 so that the fresh air can only reach the interior 2 through the disk packs 7, 8, 9. This is achieved, for example, in that the frame 24 is adapted exactly to the contour of the respective intake opening 3, 4, 25, with the disk packs 7, 8, 9 filling the intake openings 3, 4, 25 almost completely.

Due to the inventive design of the plate packs 7,8,9, which will be discussed in detail in the sequence, it is prevented that a sound wave generated in the interior directly through the intake ports 3,4, can emerge, since this meets in any case on a disk pack 7,8,9. In order to prevent the escape of a sound wave through the exhaust opening 5, a fourth disk pack 26 is provided, which covers the exhaust opening 5. The structure of the two-part fourth plate pack 26 is in Fig. 3 seen ..

Also in FIG. 2 A flexible air-impermeable separating part 22 which is arranged between the outlet side 6b of the heat exchanger 6 and the outlet opening 5 or the fourth plate pack 26 covering the outlet opening 5 can be seen. The separating part 22 is formed from a plastic film and serves to prevent a mixing of sucked fresh air and blown exhaust air. Thus, the sucked, cold fresh air does not come into contact with the blown, heated exhaust air, so that the efficiency of the heat exchanger 6 increases. The separator 22 is attached to the upper top wall or directly on the fourth plate pack 26, as glued or screwed, the connection is made possible airtight. In the upper region, the separating part 22 has a rectangular cross-section which is larger than the outline of the blow-off opening 5 and extends in the shape of a cuboid in the direction of the heat exchanger 6. In the lower region, the cross-section of the separating part 22 narrows until it essentially follows the outline of the heat exchanger Heat exchanger 6 corresponds and can be turned over this. To fix the separating part 22 on the heat exchange device 6, a releasable closing mechanism 23 in the form of a tensioning cable or lashing cable is provided (it being understood that other closing mechanisms mentioned above can also be used). The tensioning cable or lashing cable is thereby guided around the separating part 22 in the lowermost region of the separating part 22, which is slipped over the heat exchanger 6 and connected to one another at the ends or lashed down by a lashing device or fixed by a flexible cable clamp. Thus, the shutter mechanism 23 presses the partition member 22 to the heat exchange apparatus 6 and provides a sufficient seal that prevents air exchange. In an alternative embodiment, it may be provided that the separating part 22 connects in a similar manner an intake opening 3,4,25 with the suction side 6a of the heat exchange device 6.

In FIG. 3 is now the construction of the third 9 and fourth plate pack 26 clearly visible. The third plate pack 9, which covers the third intake opening 25 on the rear side wall of the outer shell 1, is constructed analogously to the first 7 and second plate pack 8. Also shows the figure, the exhaust opening 5 overlapping fourth disk pack 26, in which the blades 10 are normal to the fourth flow direction 21, ie in the horizontal direction, spaced apart. The fourth plate pack 26 occupies a large part of the surface of the upper top wall.

As in the FIGS. 1 to 3 can be clearly seen, the first 7, second 8 and third 9 plate pack each one suction side 6a of the heat exchange device 6 are arranged directly opposite one another, wherein the suction sides 6a are aligned parallel to the side walls of the outer shell 1. In each case, a gap is formed between the disk packs 7, 8, 9 and the respective suction side 6 a, which is 5-20 cm, preferably 10 cm. Because there are no further elements for deflecting the air flow, as are absolutely necessary, for example, in spiral-shaped deflections according to the prior art, a free air flow, also called free flow, is introduced from outside through the plate packs 7, 8, 9 into the heat exchange device 6 allows so that no air accumulation in the interior 2 can form. The same applies to the fourth disk set 26 covering the exhaust opening 5 and the exhaust side 6b of the heat exchange device 6.

The FIGS. 4 and 5 show a second embodiment of the sound-absorbing housing. It is a design with horizontal blow-out. In this case, the suction port 3 is formed in a side wall of the outer shell 1 and the Blow-out 5 on the side opposite the suction port 3 side wall. For the sake of clarity, analogous to the first exemplary embodiment, the disk pack covering the exhaust opening 5 is referred to as the fourth disk pack 26, although only two disk packs 7, 26 are provided. The first flow direction 18, which corresponds to the direction of the intake fresh air, and the fourth flow direction 26, which corresponds to the direction of the exhaust air blown, are parallel and point in the same direction. The upper cover wall in any case has no opening, the other two side walls may also be closed, and it is also conceivable that further suction openings are formed in the side walls. In this case, the heat exchange device 6 has a suction side 6a, which is arranged directly opposite the suction opening 3, and a blow-out side 6b arranged opposite the blow-off opening 5. Just as in the first embodiment, a minimum distance of 5-20 cm, in particular 10 cm, between the disk sets 7,26 and the heat exchange device 6 is provided.

Also in this embodiment, a separating part 22 is provided, which connects the outlet 6b of the heat exchange device 6 with the exhaust opening 5 or directly to the fourth plate pack 26. The attachment of the partition member 22 is different from the first embodiment: The partition member 22 is bolted via a mounting frame made of sheet steel with the outlet 6b of the heat exchanger 6 and connected via a serving as a closure mechanism Velcro with the fourth plate pack 26. The first 7 and the fourth plate pack 26 are constructed analogously to each other.

The outer shell 1 has in all the previously described embodiments in addition to cable bushings and line rosettes, through the refrigerant and / or electric lines that are necessary for the operation of the heat exchanger 6 can be performed in the Schalldämmgehäuse. In the area of the lower cover wall can also be a drain line be provided in the condensate cup to direct the collected water in the condensate cup water from the interior. Furthermore, one of the side walls may be designed as an access element, for example as a door, or may have an access element in order to allow easy access to the heat exchange device 6, for example for its maintenance. It may be advantageous that the access element is dimensioned so that the entire heat exchange device 6 can be inserted through this in the Schalldämmgehäuse. Thus, the soundproofing be pre-assembled or be built at its destination, the introduction of the heat exchange device 6 takes place only in one of the last assembly steps. In an alternative embodiment, for easy installation of the heat exchange device 6, the upper top wall in a simple manner be removable in order to lift the heat exchange device 6 from above into the preassembled Schalldämmgehäuse can.

In order to wait the disk packs 7,8,9,26 in a simple manner, for example, to be able to free impurities, or to make the interior 2 easily accessible even in the installed state, the disk packs 7,8,9,26 be attached to the outer shell 1 by means of at least four externally operable quick-release fasteners, for example by means of step tongues Vorreibern. Thus, each disc pack 7,8,9,26 can be removed by loosening the respective quick-release fasteners with a few simple steps from the sound insulation housing or fix it to the sound insulation housing.

In order to protect the outer shell 1 even better from the weather and / or to achieve optical effects, the outer shell 1 may be provided on the outside with a film, which may additionally have heat-insulating effects, so that the outer surface of the soundproofing less heating up. The foil-provided outer shell 1 can be manufactured, for example, by using an already foiled steel sheet.

FIG. 6 now shows schematically the structure of one of the disk packs 7,8,9,26 on the basis of two adjacent slats 10a, b. In the present illustration, this is a disk pack 7, 8, 9 which is attached to a suction opening 3, 4, 25, since the air stream A is guided into the interior 2 and thus opposite to the propagation direction 17 of a sound wave formed in the interior 2 is. For the sake of clarity, the first plate pack 7 will be removed from the in the FIGS. 1 to 3 received, it goes without saying that the other disk packs 8,9,26 work completely analog, although the fourth disk set 26 is tilted in the first embodiment by 90 °.

The air flow A transports cold fresh air along the, in the present example horizontal, first flow direction 18. It goes without saying that transported at the exhaust opening 5, the air flow A warm exhaust air and the fourth flow direction 21 is directed from the interior 2 addition.

The lamellae 10a, b each have a bend 13 which divides the lamellae 10a, b into a first leg, here straight, and a second leg, here also straight. In the present example, as a curve formed on an imaginary edge bend 13, the bending radius is small compared to the remaining dimensions selected. The two legs of the lamellae 10a, b are formed symmetrically to the bend 13. This results in a V-shape of the fins 10, wherein the two legs enclose an angle of about 90 ° with each other.

The surface of the subsequent lamella 10b, of course on both legs, of the first lamella 10a is designed as a reflection surface 11. The surface of the following lamella 10b facing the reflection surface 11 of the first lamella 10a, on the other hand, is designed as an absorption surface 12. Since all fins 10 are formed similar, are thus shown in the Embodiment respectively, the tops of the slats 10 as reflecting surfaces 11 and the lower sides as absorption surfaces 12 are formed.

If a sound wave propagating in a propagation direction 17, which has been formed, for example, by the operation of the heat exchange device 6, strikes the reflection surface 11 of the first lamella 10, the sound wave from the reflection surface 11 according to the reflection r ₁ becomes the absorption surface 12 of the following lamella 10 b reflected. There, a portion of the sound wave is absorbed and the remaining portion of the sound wave according to the absorption a ₁ reflected back to the reflection surface 11. After the reflection r ₂ and the subsequent absorption a ₂ , the remaining portion due to the bend 13 is not reflected to the reflection surface 11 but hits the second leg again on the absorption surface 12 and thus meets only on the absorption a ₃ on the reflection surface 11 In the present case, the reflection r ₃ is the last reflection in the disk set 7, since the sound wave no longer strikes the absorption surface 12 after the reflection r ₃ but emerges from the disk set 7. The illustrated reflection / absorption curve is merely an exemplary example which makes it clear that absorption occurs on the absorption surface 12 at least once, in this example, even three times in the case of the passage of the sound wave.

By the bend 13 in combination with the overlapping arrangement of the lamellae 10 in the disk set 7 it is ensured that the sound wave strikes the absorption surface 12 at least once, independently of the propagation direction 17 and the corresponding entry angle. This can happen either directly or indirectly by previous reflection on the reflection surface 11. The bend 13 prevents sound waves, the propagation direction 17 of which runs approximately parallel to the legs, being able to escape unhindered from the disk pack 7, since these at least act on the absorption surface 12 of the disk second leg of the subsequent lamella 10b impinge. If a sound wave from the interior 2 passes through the disk set 7, the sound wave will even strike the absorption surface 12 at least twice - once per leg.

The structure of a lamella 10 will now be based on a in FIG. 7 illustrated alternative embodiment of a lamella 10 described by way of example. The difference to those in the FIGS. 1 to 6 shown lamellae 10 is that instead of bending a sharp-edged kink 13 is formed. The lamella 10 comprises a strip-shaped main body 14 which consists of sheet metal and defines the shape of the lamella 10a. From a production point of view, the base body can be produced either by a bending process or by an extrusion process. On one side, in the present case the upper side, the main body 14 forms the reflection surface 11 directly. On the other side, so the bottom, a foam layer 15 made of polyurethane foam, so polyurethane foam, attached to the base body 14, which forms the absorption surface 12. In order to protect the foam layer 15 from weathering and mechanical stress, the base body 14 surrounds the lateral surfaces of the foam layer 15. For this purpose, the end portions of the base 14 are bent twice by 90 °, thus keeping the foam layer 15. With reference to the embodiment shown in the previous figures the lamellae 10 it can be seen that the foam layer 15 encompassing bends are not sharp-edged, but are provided with a bending radius to ensure the laminar flow of the air flow A and to avoid turbulence. The unenclosed part of the foam layer 15, which forms on the underside, thereby forms the absorption surface 12 and remains free accordingly.

The foam layer 15 is provided to protect against liquid with a water-repellent film, which is necessary in the present case only in the region of the absorption surface 12, as the remaining part of the foam layer 15 is enclosed and protected by the base body 14. To dampen the structure-borne noise and low frequencies, a layer 16 with increased density between the base body 14 and the foam layer 15 is attached. In the present exemplary embodiment, this is a heavy foil of bitumen or lead material, which is glued directly to the foam layer 15. The structure of the previous figures, in particular in Fig. 6 , with the exception of the sharp-edged design shown here, the structure described here of the fins 10. In other words, the fins 10, regardless of whether they are sharp or rounded, the base body 14, the foam layer 15, the layer 16 with increased density and the water-repellent film.

In general, the thickness of the base body 14 is between 0.5 to 4 mm, in particular 1 mm, the thickness of the foam layer 15 between 30 and 70 mm, in particular 40 to 60 mm, preferably 50 mm, and the thickness of the layer 16 with increased density between 1 and 4 mm , in particular about 2 mm.
In view of the above-described construction of the slats 10, wherein all the slats 10 of a disk pack 7,8,9,26 are constructed similar, so have the same dimensions in all directions of extension, it should not be unmentioned that the slats 10, although they are normal to each other respective flow direction 18,19,20,21 of the respective disk pack 7,8,9,26 are spaced from each other, yet overlap. In other words, if you look in the direction of flow 18,19,20,21 on the disk set 7,8,9,26 so you can not look directly into the interior 2 of the silencer due to the bend or the bend 13 and the given overlap. This prevents correspondingly that sound waves can pass undamped through the disk pack 7,8,9,26. The fins 10 of a disk set 7,8,9,26 are naturally arranged in the same direction, so that the kink or the bend 13 of all fins 10 in a plane whose normal vector is the Flow direction 18,19,20,21 and that the first leg or the second leg of all slats 10 are aligned parallel to each other.

LIST OF REFERENCE NUMBERS

1

outer shell

2

inner space

3

first intake opening

4

second suction port

5

exhaust vent

6

Heat exchange device

6a

suction

6b

air outlet

7

first plate pack

8th

second disc pack

9

third disc pack

10

slats

11

reflecting surface

12

absorbing surface

13

Kink or bend

14

strip-shaped basic body

15

foam layer

16

Layer with increased density

17

propagation direction

18

first flow direction

19

second flow direction

20

third flow direction

21

fourth flow direction

22

separating part

23

locking mechanism

24

frame

25

third intake opening

26

fourth disc pack

A

airflow

r _{1 ... n}

reflection

a _{1 ... n}

absorption

Claims (15)

Sound insulation housing for receiving at least one heat exchange device (6), preferably an air conditioning or refrigeration device or a heat pump, in an interior space (2) of the sound insulation housing,
wherein the sound insulation housing comprises an outer shell (1) which bounds the interior space (2),
wherein the outer shell (1) has at least one suction opening (3,4,25) for the inlet of fresh air into the interior space (2) and at least one blowing opening (5) for the outlet of exhaust air from the interior space (2), characterized that
a disk pack (7, 8, 9, 26) covering the at least one intake opening (3, 4, 25) and / or the at least one exhaust opening (5) and comprising a plurality of disks (10) in the region of the intake opening (3, 4) , 25) and / or in the region of the exhaust opening (5) is arranged,
wherein at least two adjacent lamellae (10a, b) of the disk pack (7, 8, 9, 26) each have a reflection surface (11) and an absorption surface (12) and the reflection surface (11) of the first lamination (10a) opposite the absorption surface (10) 12) of the subsequent lamella (10b) is arranged,
wherein each lamella (10) has at least one bend or bend (13), so that a sound wave emerging in the interior (2) and propagating in a direction of propagation (17) can be inserted between the lamella packet (7, 8, 9, 26) and Exit from the disk set (7,8,9,26) meets at least once on the absorption surface (12). Acoustic enclosure according to claim 1, characterized in that the lamellae (10) have a strip-shaped base body (14), in particular of sheet metal or plastic, have. Acoustic enclosure according to claim 2, characterized in that the reflection surface (11) from the base body (14) is formed. Acoustic enclosure according to claim 2 or 3, characterized in that a foam layer (15), preferably of polyurethane foam, on the base body (14) is mounted, which foam layer (15) on the surface facing away from the base body (14) forming the absorption surface (12). Acoustic enclosure according to claim 4, characterized in that the base body (14) surrounds the foam layer (15), wherein at least the absorption surface (12) remains free. Acoustic enclosure according to claim 4 or 5, characterized in that the foam layer (15) is protected at least in the region of the absorption surface (12) by a dirt and water-repellent film. Schalldämmgehäuse according to one of claims 2 to 6, characterized in that the lamellae (10), in particular between the base body (14) and the foam layer (15) arranged, layer (16) with respect to the base body (14) comprises increased density. Schalldämmgehäuse according to one of claims 1 to 7, characterized in that in each case at least two adjacent lamellae (10a, b) in one of the disk packs (7,8,9,26) normal to a flow direction (18,19,20,21) of the Disk packs (7,8,9,26) of the sucked or blown air are spaced apart and overlap each other in the flow direction (18,19,20,21) at least in sections. Acoustic enclosure according to claim 8, characterized in that all lamellae (10) of a lamina packet (7,8,9,26) are aligned in the same direction. Acoustic enclosure according to one of claims 1 to 9, characterized in that the lamellae (10) have a V-shaped cross-section. Schalldämmgehäuse according to one of claims 1 to 10, characterized in that at the suction port (3,4,25) and / or at the exhaust opening (5) a flexible air-impermeable separating part (22) is detachably attached, which consists of a plastic film and such in that the air sucked in by the heat exchanger (6) and the air blown out by the heat exchanger (6) do not mix, and which has a releasable closure mechanism (23) for attachment to the heat exchanger (6). Schalldämmgehäuse according to claim 11, characterized in that the airbag (22) has a substantially rectangular cross-section, which tapers from the outer shell (1) at least partially inward. Acoustic enclosure according to one of claims 1 to 12, characterized in that a condensate cup is provided, in which a rubber mat is integrated for damping of drone noise. System comprising a sound-insulating housing according to one of claims 1 to 13 with at least one heat exchange device (6) which is arranged in the interior (2) of the sound-damping housing, that a suction side (6a) of the at least one heat exchange device (6) to a suction opening (3, 4.25) overlapping disk set (7,8,9) directly opposite
and / or that
an outlet side (6b) of the at least one heat exchange device (6) directly opposite a disk pack (26) covering an exhaust opening (5) in order to allow a free air flow between the disk packs (7, 8, 9, 26) and the at least one heat exchange device (6) to reach. System according to claim 14, characterized in that a flexible air-impermeable separating part (22) connects the at least one suction opening (3, 4, 25) of the sound-absorbing housing to the suction side (6a) of the at least one heat-exchanging device (6)
and or
in that a flexible, air-impermeable separating part (22) connects the at least one blow-out opening (5) of the sound-insulating housing to the outlet side (6b) of the heat-exchanging device (6).

Images