EP4257767A1 - Absorber unit for absorbing sound and assemblies comprising such a sound absorbing absorber unit - Google Patents

Abstract

An absorber unit (30) is provided for absorbing sound in a room or building, in particular in a room or building with increased hygiene and/or clean room requirements. The absorber unit (30) has: a flat, sound-absorbing absorber element (32), a flat grid or perforated plate element (34), a side surface of the absorber element (32) being arranged parallel to a side surface of the grid or perforated plate element (34), and a frame element (36, 38, 40) which holds and connects the absorber element (32) and the grid or perforated plate element (34) to one another.

Description

The invention relates to a sound-absorbing absorber unit for absorbing sound in a room or building, in particular in a room or building with increased hygiene and/or clean room requirements, and an arrangement with such a sound-absorbing absorber unit.

In industry, high noise emissions can occur in buildings or rooms due to machines in operation. These noise emissions are particularly stressful for employees, as access to the rooms is sometimes only permitted with hearing protection. The walls in such buildings are typically designed as soundproof walls, for example smooth glass board elements, tiled walls or concrete walls. These types of walls barely absorb sound and reflect almost all of the sound that hits the walls. In order to reduce sound emissions, sound absorbers, such as perforated sheets, are mounted on the room walls and/or the ceiling.

It is therefore the object of the invention to provide a flexible, easy-to-assemble and clean absorber unit and arrangements with such an absorber unit.

This task is solved with the features of claims 1, 14 and 15. Advantageous refinements are the subject of the subclaims.

According to claim 1, an absorber unit for absorbing sound in a room or building, in particular in a room or building with increased hygiene and / or clean room requirements, is provided. The absorber unit has: a flat, sound-absorbing absorber element, a flat grid or perforated plate element, with a side surface of the absorber element parallel to a side surface of the grid or Perforated plate element is arranged, and a frame element that holds and connects the absorber element and the grid or perforated plate element to one another.

The side surface of the absorber element is preferably flatly opposite the side surface of the grid or perforated plate element. Preferably, the side surfaces of the absorber element and the grid or perforated plate element lie opposite one another in an overlapping or completely overlapping manner.

'Arranged in parallel' also includes 'arranged substantially parallel'. For example, the opposite side surfaces can be inclined to one another by up to 2°, 4° or 8°.

As described above, the absorber unit can be used in a room or building with increased hygiene and/or clean room requirements. For example, the absorber unit can be used to absorb sound in a room or building for animal feed production, in a room or building in pharmacy, in semiconductor technology, or in the food processing industry.

In order to reduce noise in such rooms or buildings, the above-mentioned absorber unit can be mounted on the walls and/or ceilings. The absorber unit can be mounted in any position. Preferably, the absorber unit is mounted by means of a holder device at a distance in front of the surface of the wall or ceiling.

When the sound waves or sound strike the openings of the grid or perforated plate element, the sound waves are at least partially absorbed and scattered through the openings. The sound waves are distributed over a larger area by the grid or perforated plate element, thereby improving the possibility of absorption in the perforations. The sound waves that have penetrated the grid or perforated plate element then penetrate the absorber element, whereby the sound waves are further absorbed and thus lose energy and then leave the absorber unit.

When installed, the sound coming from the rear or wall side of the absorber unit hits a reverberant surface, for example a wall or ceiling (or in the case of a baffle arrangement, an intermediate element, see below) and is reflected on this. The reflected sound then penetrates again Absorber unit and is further absorbed. This results in an absorption-increasing effect and therefore good sound reduction.

By combining the grid or perforated plate element with the absorber element (i.e. multi-layer structure compared to a single-layer structure), the sound or sound waves that strike the absorber unit are reduced to a greater extent.

Preferably, the assembled absorber unit or the absorber element and the grid/perforated plate element are a flat unit. This means that the unit can be mounted parallel to a wall to save space.

Preferably, the absorber unit and in particular the frame element and/or the grid/perforated plate element and/or the absorber element have a rectangular or square shape.

In addition to supporting the absorption effect, the grid or perforated plate element also serves as protection against mechanical damage or abrasion of the absorber element and in particular the film that encloses the absorber element (see below).

Preferably, the frame element supports the absorber element and/or the grid or perforated plate element on at least two opposite side edges or surfaces. Additionally or alternatively, the frame element preferably mechanically stabilizes the absorber element and/or the grid or perforated plate element, so that this or these remain stretched flat.

'Spanishly spanned' means that the absorber element and/or the grid or perforated plate element maintains the specified flat spread and does not bend/bend. For example, the perforated plate element or the absorber element are not inherently stable and would curve or bend without support.

Preferably, the frame element encloses the grid or perforated plate element and/or the absorber element at least partially on its side edges or side surfaces.

Preferably, the absorber element and/or the grid or perforated plate element are removably inserted or pushed or clamped into the frame element. Alternatively or additionally, the frame element can form a lateral guide which is designed to accommodate two opposite side edges or surfaces of the absorber element and/or the grid or perforated plate element.

Because the absorber element and/or the grid or perforated plate element can be removed from the frame element, it is possible to assemble or dismantle the absorber unit easily and quickly. This also makes it possible to quickly and easily disassemble the absorber unit into its individual components, i.e. frame element, absorber element and grid or perforated plate element, for cleaning or repair or maintenance.

Because the absorber unit is easy to clean, it can be used in a room or building with increased hygiene and/or clean room requirements. For example, the absorber unit and in particular the grid or perforated plate element (front in the assembled state) can be sprayed on the wall or ceiling in the assembled state, for example with a pressure of 3-5 bar. This type of cleaning is preferably used for minor contamination or for rough cleaning. Alternatively, the absorber unit can be dismantled for cleaning and disassembled into its individual parts and then cleaned. This type of cleaning is preferably used when thorough cleaning of the absorber unit is necessary, i.e. the absorber unit is heavily contaminated.

The frame element can be designed as a type of “picture frame”, with the absorber element and/or the grid or perforated plate element being removably clamped in the frame element. The frame element is preferably designed to be openable, for example the frame element is designed in two parts along a plane parallel to the mutually parallel or opposite side surfaces of the grid or perforated plate element and the absorber element. For example, by opening the frame element, the absorber element can be removed vertically in a direction from the opposite side surfaces of the absorber element and grid or perforated plate element.

Preferably, the frame element, into which the absorber element and the grid or perforated plate element are inserted, is designed as a unit, which in turn is clamped in a further frame element, which is used to hang the absorber unit and of the grid or perforated plate element. This means that during dismantling, the entire unit can be removed in one piece, while the frame element used to hang the unit does not have to be dismantled.

Alternatively, the absorber element and/or the grid or perforated plate element can be pivotally connected to the frame element, for example by a hinge. In the closed state, the absorber element and/or the grid or perforated plate element are preferably clamped in the frame element. After the absorber element and/or the grid or perforated plate element has been pivoted out, the absorber element and/or the grid or perforated plate element can be removed from the frame.

For example, the grid or perforated plate element is pivotally connected to the frame element and the absorber element is inserted into the frame element. After the grid or perforated plate element has been pivoted out (preferably moving like a door), the absorber element can be removed in a direction vertical to the opposite side surfaces of the grid or perforated plate element and the absorber element.

Alternatively, the grid or perforated plate element can be pivotally connected to the frame element and the absorber element is removably mounted on the grid or perforated plate element. In this case, the absorber element moves when the grid or perforated plate element is pivoted out. After swinging out, the absorber element can be removed.

The lateral guide is preferably formed by two opposing guide profiles. The guide profiles are particularly preferably U-shaped. The frame element preferably has a guide or two opposing guide profiles for the absorber element and a guide or two opposing guide profiles for the grid or perforated plate element.

Preferably, the frame element is designed to be open on at least one side surface adjacent to the grid element, so that the absorber element and/or the grid/perforated plate element can be inserted or pushed into the frame element through the open side surface. Preferably, a side surface of the frame element opposite the open side surface is designed to be at least partially closed and/or has a stop element. The stop element is preferably integrated in the lateral guide.

As a result, the absorber element and/or the grid or perforated plate element is held in its end position in the frame element or in the lateral guide by the open side surface after being pushed into the frame element or into the respective lateral guide. The movement of the absorber element in the insertion direction is thus limited by the opposite side surface or the stop element.

Preferably, the frame element is designed to be at least partially open on a side of the absorber element facing away from the grid or perforated plate element in a direction perpendicular to the side surface of the absorber element. This means that the absorber unit is designed to be at least partially open on the back (in the assembled state on the wall or ceiling or on a side facing an intermediate plate in the case of a baffle arrangement as described below).

As a result, the sound that has penetrated the absorber element can leave the absorber unit and migrate towards a reverberant surface, for example a wall or ceiling (or in the case of a baffle arrangement as described below, towards the intermediate plate) and is reflected from there back towards the absorber unit.

Preferably, the frame element has an outer frame element and an inner frame element, wherein the inner and outer frame elements are arranged parallel to one another and the inner frame element is completely or substantially completely accommodated in the outer frame element, and wherein the outer frame element is the grid or perforated plate element and the inner frame element holds the absorber element.

The outer contours of the inner and outer frame elements are preferably aligned with one another, i.e. opposite outer edges of the inner and outer frame elements are preferably arranged parallel to one another (the frame elements are not twisted relative to one another). This enables a compact design of the entire absorber unit.

Preferably, the inner frame element is removably inserted or pushed into the outer frame element, and/or the absorber element is removably inserted or pushed into the inner frame element.

The outer frame element preferably encloses and/or supports the grid or perforated plate element on at least two opposite side edges or surfaces. Preferably, the outer frame element encloses and/or supports the inner frame element on at least two opposite side edges or surfaces of the inner frame element, and/or the inner frame element encloses and/or supports the absorber element on at least two opposite side edges or surfaces.

The two-part frame element with the frame elements pushed or inserted into one another makes it possible to disassemble or assemble the absorber unit into its components easily and quickly, in particular without the use of tools. This makes it possible to thoroughly clean all components of the absorber unit. In particular, by disassembling it is possible to make hard-to-reach areas of the absorber unit accessible, which ensures thorough cleaning of the entire absorber unit. Because the absorber unit is easy to clean, it can be used in a room or building with increased hygiene and/or clean room requirements.

In addition, by removing the inner frame element from the outer frame element and the absorber element from the inner frame element and/or the grid or perforated plate element from the outer frame element, worn or defective individual components of the absorber unit can be replaced quickly and easily.

Preferably, the outer frame element is designed to be open on at least one side surface, so that the inner frame element with the absorber element can be inserted through the open side surface of the outer frame element into the interior of the outer frame element. Preferably, the inner frame element is designed to be open on one side surface, so that the absorber element can be inserted through the open side surface of the inner frame element into the interior of the inner frame element.

Particularly preferably, in the assembled state of the absorber unit, the open side surfaces of the outer and inner frame elements are arranged opposite and/or parallel to one another. This means that the insertion and removal directions during assembly or disassembly are for the inner frame element and the absorber element rectified. This simplifies handling when assembling or dismantling the absorber unit.

Preferably, the outer frame member forms a first lateral guide configured to receive two opposing side edges or surfaces of the inner frame member, and/or the inner frame member may form a second lateral guide configured to receive two opposing side edges or surfaces. to accommodate surfaces of the absorber element. Through the guides, the absorber element can be easily and quickly inserted or pushed into the inner frame element or the inner frame element into the outer frame element.

Alternatively, the absorber unit can also only have the outer frame element, i.e. the absorber unit has only one frame element that holds the grid/perforated plate element and the absorber element. In this case, the first guide is preferably designed to accommodate two opposite side edges or surfaces of the absorber element and the grid or perforated plate element. In this case, the guide for the absorber element is integrated in the one frame element that also holds the grid or perforated plate element (i.e. not in a separate inner frame element, which in turn is accommodated in an outer frame). As a result, the absorber unit has fewer components, which in turn increases the cleaning effort of the absorber unit.

Alternatively or additionally, the inner frame element is preferably designed to be at least partially open in a direction perpendicular to the grid or perforated plate element and the outer frame element is designed to be at least partially open on a side of the outer frame element opposite the grid or perforated plate element. As a result, sound waves can travel through the entire absorber unit, i.e. from the grid or perforated plate element through the absorber element, and then leave this and, in the assembled state, be reflected on a reverberant element, for example on a reverberant wall, and travel through the absorber unit again.

Preferably, the first guide has opposing U-profiles which are open towards the interior of the outer frame member and are designed to receive between them two opposing side edges or surfaces of the inner frame member. Alternatively or additionally, the second guide is preferred opposite U-profiles, which are open towards the interior of the inner frame element and are designed to accommodate two opposite side edges or surfaces of the absorber element between them.

The opposite U-profiles of the respective guide are preferably arranged symmetrically to one another. The U-profiles can be continuous profiles. Alternatively, each guide can have opposing guide elements on each side, for example in the form of a U-profile.

Preferably, the U-profiles of the outer frame element are through side surfaces of the outer frame element, in particular through the grid or perforated plate element and a side surface of the outer frame element opposite the grid or perforated plate element and side surfaces which connect the grid or perforated plate element and the opposite side surface to one another, educated.

The U-profiles, in particular of the inner frame element, are preferably made of plastic and are particularly preferably produced using an injection molding process. The use of plastic prevents the absorber element, in particular the film of the absorber element (see below), from being damaged during assembly and disassembly.

In one embodiment, the absorber element can be a grid or perforated plate element (instead of or in addition to the absorbent core also described herein), in particular a micro-perforated sheet metal. This means that the absorber unit has two (or three) grid or perforated plate elements. The specifications listed here with regard to the grid or perforated plate element or the micro-perforated sheet preferably also apply to the absorber element in the form of a grid or perforated plate element.

The absorber element particularly preferably has: a flat core made of a sound-absorbing material, and optionally a film surrounding the core on the outside.

The core is preferably welded and/or glued into the film. The core is particularly preferably completely enclosed by the film. The film can be coated with an adhesive layer on the inside (side of the core). Alternatively, the film is a coating that surrounds the core like a film or the outer surfaces of the core seals. Alternatively, the 'film' can be a shell in which the core is inserted. For example, a foam can be injected into a thin plastic casing, which expands within the casing and, after hardening, produces the desired external shape.

The film is preferably waterproof, particularly preferably the film is vapor barrier or vapor retardant, in particular with an SD value between 0.5 m and 1500 m. Preferably the film is vapor tight with an SD value > 1500 m.

The surrounding film prevents contaminants and/or bacteria from getting into the core of the absorber element. The outer surface of the film can be freed from bacteria through regular cleaning. This makes it possible, for example, to use the absorber element in a room or building with increased hygiene and/or clean room requirements, such as the food industry. When used in a room or building with increased hygiene and/or clean room requirements, the film should be replaced if damaged to prevent bacteria from getting inside to the core. If the film is damaged, more and more bacteria would accumulate inside the absorber element, which could no longer be removed even by cleaning.

The absorber element is preferably designed like a cushion, i.e. the film is preferably not stretched, so that the absorption effect is favored.

The core can have or be formed from: nonwoven materials (such as mineral wool, rock wool, glass wool), felt materials (e.g. sheep's wool, wood wool) or porous material (e.g. foam, resin foam, Basotect or porous mineral). For example, the foam is made of polyurethane.

Alternatively or additionally, the core has an absorption coefficient α ≥ 0.7 at 1 kHz, preferably α ≥ 0.8, 0.85 or 0.9.

For example, if the core is made of mineral wool with a thickness of 50 mm and in particular the grid or perforated plate element has a thickness of 1 mm and a hole area of 40%, the degree of absorption of the entire absorber unit is α = 0.9 at 0.5 kHz, α = 1.0 at 1 kHz, α = 0.98 at 2 kHz with the sound simply passing through the absorber unit (ie without taking into account the reflection of the sound on a reverberant wall and re-penetrating the absorber unit).

• bei einem Kern aus Schaumstoff, insbesondere Polyurethan mit einer Dicke von 15 mm, beträgt der Absorptionsgrad α = 0.7 bei 1 kHz und α = 0.85 bei 2 kHz,
• bei einem Kern aus Schaumstoff, insbesondere Polyurethan mit einer Dicke von 25 mm, beträgt der Absorptionsgrad α = 1.0 bei 1 kHz und α = 0.92 bei 2 kHz,
• bei einem Kern aus Mineralwolle mit einer Dicke von 20 mm ohne Wandabstand, beträgt der Absorptionsgrad α = 0.95 bei 1 kHz und α = 1.0 bei 2 kHz,
• bei einem Kern aus einer Holzwolleleichtbauplatte mit einer Dicke von 25 mm, beträgt der Absorptionsgrad α = 0.75 bei 1 kHz, und
• bei einem Kern aus einer Glaswollmatte mit einer Dicke von 30 mm, beträgt der Absorptionsgrad α = 0.8 bei 0.5 kHz, α = 0.95 bei 1 kHz und α = 0.95 bei 2 kHz.

If the sound simply passes through the core, the following results:

• with a core made of foam, in particular polyurethane with a thickness of 15 mm, the absorption coefficient is α = 0.7 at 1 kHz and α = 0.85 at 2 kHz,
• with a core made of foam, in particular polyurethane with a thickness of 25 mm, the absorption coefficient is α = 1.0 at 1 kHz and α = 0.92 at 2 kHz,
• for a mineral wool core with a thickness of 20 mm without wall clearance, the absorption coefficient is α = 0.95 at 1 kHz and α = 1.0 at 2 kHz,
• For a core made of a wood wool lightweight building board with a thickness of 25 mm, the absorption coefficient is α = 0.75 at 1 kHz, and
• For a core made of a glass wool mat with a thickness of 30 mm, the absorption coefficient is α = 0.8 at 0.5 kHz, α = 0.95 at 1 kHz and α = 0.95 at 2 kHz.

Preferably the film has a thickness in the range of 20-200 µm, 20-60 µm, 50-90 µm, 80-120 µm, 120-160 µm, or 140-200 µm, and/or the film consists of one of the following Plastic materials: Polyethylene PE, preferably low density polyethylene (LDPE) or high density polyethylene (HDPE), polypropylene PP, polyamide, PET, PS. Alternatively or additionally, the thickness of the absorber element can be in the range of 60-200 mm, 60-100 mm, 80-120 mm, 110-150 mm, 140-180 mm, or 160-200 mm, and/or the total thickness of the absorber unit is preferably in the range of 60-400 mm, 60-140 mm, 100-180 mm, 140-220 mm, 200-280 mm, 250-350 or 300-400 mm, the total thickness of the absorber unit preferably being 100 mm or substantially is 100 mm.

The thickness of the absorber unit or the absorber element preferably corresponds in each case to the extent of the absorber unit or the absorber element perpendicular to the side surfaces of the grid or perforated plate element and the absorber element, which are arranged parallel to one another and opposite one another.

Preferably, the grid or perforated plate element is a micro-perforated sheet, and/or the sheet has a thickness in the range of 0.5-0.8 mm, 0.7-1.0 mm, 0.9-1.2 mm, 1.1-1.5 mm, 1.4-1.8 mm or 1.6-2.0 mm, and preferably has a thickness of or essentially 0.7 mm, 1 mm, 1.25 mm, 1.5 mm or 2.0 mm. Alternatively or additionally, the perforated plate can be made of steel, aluminum or stainless steel.

The perforations can be designed as holes and/or slots. The perforations are preferably uniform over the entire or substantially entire sheet arranged distributed. The holes of the micro-perforated sheet preferably have a diameter in the range of 0.02-0.04 mm, 0.03-0.05 mm or 0.04-0.06 mm. The slots of the micro-perforated sheet preferably have a slot width in the range of 0.03-0.06 mm, 0.05-0.08 mm, 0.07-0.1 mm or 0.09-0.12 mm. Preferably, the hole proportion of the hole element or micro-perforated sheet is less than 5%, 4% or 3%. The proportion of holes in a micro-perforated hole element or sheet is preferably in a range of 0-2%, 1-3%, or 2-5%. The hole proportion is preferably the ratio between the sum of the entry or front surfaces of all holes or slots to the total (front) surface of the perforated plate element. With such a (small) proportion of holes in the perforated plate element, this also contributes to sound absorption. If, on the other hand, the grid or perforated plate element (predominantly) fulfills a protective or shielding function against mechanical damage for the absorber element, the proportion of holes in the grid or perforated plate element is preferably at least 30%, 40%, 50% or 60%.

The perforated sheet metal preferably attenuates or reduces sound waves with low and medium frequencies.

Due to the durable material, the grid or perforated plate element or the perforated sheet can be hygienically cleaned with a cleaning agent such as an acid or alkali. For example, the absorber unit can simply be sprayed with the cleaning agent.

Distance between elements/air gap: Preferred are the grid or perforated plate element and the absorber element and/or the absorber element and a side surface of the frame element, in particular of the outer frame element, which is arranged parallel to the absorber element on a side of the absorber element opposite the grid or perforated plate element, arranged spaced apart from each other. The distance is preferably in a range of 10-60 mm, 10-30 mm, 20-40 mm, 30-50 mm or 40-60 mm, and is particularly preferably 20 mm or essentially 20 mm.

The distance corresponds to the distance between the opposing surfaces of the grid or perforated plate element and the absorber element or the absorber element and the opposite parallel side surface of the frame element. The distance creates an air gap or air cushion that promotes sound reduction. In particular, the air gap results in a phase transition for the sound waves, This means that the sound waves from the grid or perforated plate element can pass better into the film. Starting from the grid or perforated plate element, the structure of the absorber unit is preferably as follows: grid or perforated plate element - air gap - absorber element - air gap - side surface of the frame element or the outer frame element.

The distance between the absorber element and the opposite end face of the frame element or the outer frame element ensures that after installation on the wall or ceiling there is sufficient distance between the wall or ceiling and the absorber element. This promotes noise reduction.

Preferably, the material or the surfaces of the absorber unit, in particular of the frame element, preferably the inner and/or outer frame element, and/or the absorber element and/or the grid or perforated plate element, are corrosion-resistant and/or alkali-resistant and/or acid-resistant and/or CIP -are treatable and/or tear-resistant. This makes it possible to easily clean the absorber unit or the individual components of the absorber unit using any cleaning agent. Preferably, at least surface cleaning of the grid or perforated plate element can also be carried out on site without having to dismantle the absorber unit (i.e. CIP = Cleaning in Place).

Alternatively, the entire absorber unit can be dismantled and broken down into its individual parts for cleaning.

Preferably, the entire absorber unit (apart from the absorber element in the case of the core with surrounding film and/or the U-profiles) is made of steel, aluminum or stainless steel. Particularly preferred is the entire or almost entire frame element, in particular the inner and outer frame element (apart from the guide elements if they are made of plastic), and/or the grid or perforated plate element (and/or the absorber element if made as a perforated sheet metal). ) and/or possible holding devices made of steel, aluminum or stainless steel.

The absorber unit preferably has a holding or holding device for attaching the absorber unit to a wall and/or ceiling. For example, wall profiles or rail elements can be mounted on the wall or ceiling, with the absorber unit can be mounted on the rails by means of the holding device, preferably releasably. The re-detachability allows quick assembly and disassembly to replace or clean the absorber unit or the components of the absorber unit.

For example, the wall profiles have hook elements and the holding device of the absorber unit has openings, for example slots, which are designed to accommodate hook elements. This means that the absorber unit can be attached and removed quickly and easily without the use of any tools.

Alternatively, the absorber unit can be mounted hanging from the ceiling using a cable element. The cable element can be mounted on existing elements on the ceiling, for example on existing pipes. This means that no additional holes need to be made in the ceiling for installation.

The absorber unit can be mounted with the rope element on the ceiling in the middle of the room or in an edge area of the ceiling, so that the absorber unit hangs down on a side wall of the room and / or rests against it. By hanging it in the edge area of the ceiling, you can avoid having to make holes in the side wall of the room for installation.

When hanging from the ceiling, a cable pull is preferably provided, which is designed to lower the absorber unit to a desired working height if necessary. The absorber unit can then be cleaned, maintained or dismantled at the desired working height. Such a cable pull is preferably used if it is difficult for the employee to access the absorber unit on the ceiling (for example if the ceiling and thus the absorber unit hangs very high up).

Furthermore, an arrangement (baffle arrangement) is provided which comprises: a first and second absorber unit as described herein, and an intermediate element, preferably an intermediate plate, the first absorber unit having a first side surface of the intermediate element and the second absorber unit having a second and the first side surface opposite side surface of the intermediate element is connected, and wherein the grid or perforated plate elements of the first and second absorber elements are each arranged facing away from the intermediate element. The intermediate plate is preferably a sound-hard plate that absorbs sound well reflected. Alternatively, a plate can be used in which the sound is absorbed when reflected.

The absorber units are preferably arranged symmetrically to the intermediate element.

The intermediate element preferably has fastening means for fastening the arrangement. The fastening means are preferably arranged on opposite sides of the intermediate element. The arrangement can be suspended from the ceiling using the fasteners. For example, the arrangement is mounted hanging from the ceiling using a rope.

Preferably, at least a section of the intermediate element protrudes beyond the absorber units, and the fastening means are particularly preferably arranged in this protruding section.

The sound waves that have penetrated the first and second absorber units are reflected on the respective surface of the intermediate element and thus penetrate the absorber units again. The sound waves are thus absorbed again by the absorber units and there is an increased overall absorption of the sound waves.

Furthermore, an arrangement of an absorber unit on a wall or ceiling is provided, the arrangement comprising: an absorber unit as described herein, at least one holder device for releasably holding the absorber unit on the wall or ceiling, the absorber unit being attached to the wall or ceiling by means of the holding device is mounted, and wherein the grid or perforated panel element faces away from the wall or ceiling.

The holding device is preferably designed to hold the absorber unit parallel in front of the wall. Preferably, no material, in particular no sound-hard material, is arranged between the back (in the assembled state) of the absorber element and the surface of the wall. Alternatively, a soundproof element, for example a soundproof sheet metal, can be mounted on the back (in the assembled state) on the wall or ceiling.

Preferably, the absorber element of the absorber unit is spaced from the back of the absorber element by the frame element, so that during assembly Absorber unit without a distance to the wall or ceiling although there is a distance between the wall or ceiling and the absorber element.

Alternatively or additionally, the holding device can be designed such that when the absorber unit is in the assembled state, the holding device holds the absorber unit at a distance from the surface of the wall or ceiling.

The above-mentioned embodiments of the absorber unit are fully applicable for the following embodiments of the absorber unit and the below-mentioned embodiments of the absorber unit are also fully applicable for the above embodiments of the absorber unit.

Furthermore, a sound-absorbing absorber unit is provided for absorbing sound in a room or building or in a machine enclosure, in particular in a room or building with increased hygiene and / or clean room requirements or a machine enclosure in such a room or building. The sound-absorbing absorber unit has: a sound-absorbing absorber element, and a holding device on which the absorber element is mounted, preferably releasably, and which is designed to be mounted on a line element, so that the absorber element is arranged at a distance from the line element.

Preferably, the line element is a divisional line element in which one or more of the following media are routed: liquid medium (such as water), gaseous medium (such as compressed air, purified gas, process gas, gaseous fuel), data, electricity. The line element is preferably a pipe element or a pipeline with a preferably circular or almost circular cross section. Particularly preferably, the line element is a pipeline which is arranged in a room or building with increased hygiene and/or clean room requirements, for example in a food processing building or room.

In sound-polluted rooms, the problem is often that there is not enough space on the walls or ceilings in the rooms to be able to install enough absorbers to achieve the desired noise reduction. For example, pipes, sprinkler and lighting systems or machine parts block the mounting surfaces for the absorbers and/or accessibility of the mounted absorbers for cleaning and maintenance can no longer be guaranteed. For example, since high hygiene standards apply in the food processing industry, Only absorbers that can meet the relevant standards, such as easy cleaning of the absorbers, come into consideration.

The absorber unit according to the invention makes it possible to mount sound absorbers in a room or building on existing line elements such as pipelines. Such pipelines are installed in large quantities in industry, for example in the food processing industry or in rooms or buildings for animal feed production, pharmaceuticals or semiconductor technology. For example, liquids such as water, dairy products, gaseous media, powdery media such as sugar or flour, or the like are transported through such line elements.

Existing line elements that already exist are used to assemble the absorber unit. So no additional assembly material is necessary. This means that surfaces in the room can also be provided with the absorber units on which pipes are arranged and which previously could not be used as mounting surfaces with conventional absorbers.

The installation of the absorber unit is quick and easy and can be done without specialist personnel or specialist knowledge. With conventional absorbers, however, holes or screw connections have to be made in the walls during installation, and in particular insulation in the walls has to be penetrated. The holes and penetrations represent potential weak points; thermal bridges are created, particularly in air-conditioned hygiene rooms, or niches and holes that are difficult to clean are created in rooms with high hygiene requirements.

By releasably mounting the absorber element on the holding device, for example by screws or snap connections, the absorber element can be quickly and easily dismantled for cleaning or maintenance purposes (for example replacing the worn absorber element with a new one).

The distance between the line element and the absorber element after installation creates an air cushion between them, which improves the sound-reducing effect of the absorber unit.

By attaching the absorber unit to a line element, not only is room sound absorbed, but the line is also shielded against mechanical forces in the area of the absorber unit.

The absorber element is preferably a curved or curved plate element. As a result, the absorber unit can be made more compact, in particular the absorber unit or the absorber element can be adapted to the shape of the line element, whereby space can be saved during assembly. In particular, in comparison to a horizontally arranged absorber element in the form of a non-curved plate element, the curved absorber element has a smaller width due to the curvature or bend with the same surface area. The more compact design means that more area of the room or building can be covered with absorber elements. This allows a higher noise reduction to be achieved.

Preferably, the surface, in particular the entire surface, of the absorber element is bent or curved, in particular with a predetermined bending radius or bent or curved in a parabolic shape. Preferably, at least 40, 50, 60, 75, 85 or 95% of the surface is curved, in particular with a uniform bending radius or parabolic or with a polygonal bending curve. In the case of a parabolic bend, the apex of the curvature is preferably located centrally on the line of curvature.

The curvature can be arcuate along the curvature curve or designed as a parabolic section or as an angular, preferably as a multi-edged bend. Preferably, the central axis of the curvature is aligned linearly or parallel along the extent of the absorber element.

The absorber element preferably forms a section of a pipe or cylinder wall that does not span the entire circumference. Not spanning the entire circumference means that the section of the pipe or cylinder wall is designed to be open on one side in the area of the circumference that is not spanned. The opening preferably faces the holding device. The section of the pipe or cylinder wall can be a polygon in cross section (i.e. pipe or cylinder wall along the circumference).

Preferably, the holding device can be arranged or arranged on the (linear) line element in such a way that the central axis of the curvature or bend of the absorber element is aligned parallel, preferably coaxially, to the (linear) line element (ie the curvature of the absorber element takes place in relation to the line element). In the case of a parabolic section, the absorber element is preferably aligned with the fastening element or the line element in such a way that the fastening element or the line element is at the focal point and/or the absorber element is mirror-symmetrical to the focal point (or axis of focal point and apex).

The curvature preferably runs along a curvature curve and is arcuate or angular, with the two ends of the curvature curve, measured from the center of the curvature or bend, enclosing an angle (α) which is in a range of 0 - 90°, 30 - 120°, 60 - 150 °, 90 - 180 °, 140 - 230 ° or 190 - 270 °, preferably 180 ° or essentially 180 °. In other words, the absorber element is preferably bent or curved in the shape of a tube wall or cylinder wall, with the absorber element only having an arc range of 0 - 90°, 30 - 120°, 60 - 150°, 90 - 180°, 140° in the circumferential direction - 230° or 190 - 270°.

In the assembled state of the absorber unit, the distance between the absorber element and the line element or the fastening element is preferably in a range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm, particularly preferably the distance is 100 mm. The distance improves the sound-reducing effect of the absorber unit. The effect of sound reduction increases with increasing distance.

Preferably, the distance is the distance between the outer surface of the line element or the fastening element and the surface of the absorber element facing the line element. If the absorber element is constructed from several layers (described below), then the distance is preferably the distance between the outer surface of the line element or the fastening element and the surface of the layer of the absorber element that faces the line element.

Preferably, the minimum distance or the clear width between the back of the absorber element and a line element on which the absorber unit is mounted, and / or the length of at least one spacer (for example the connecting element described below) of the holding device is at least 50, 70 or 100 mm or is in the range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm.

The distance described above or this minimum distance makes it possible to use a spray lance between the outside of the line and the inside of the absorber element (ie the side that faces the outside of the line) to deliver a cleaning liquid to spray in. This ensures hygienic cleaning of the absorber unit or absorber element in the assembled state.

Preferably, the holding device has at least one holding element with a fastening element for fastening to the line element and/or at least one connecting element for connecting the fastening element to the absorber element. The fastening element is preferably designed to be mounted on the line element.

The fastening element is preferably adapted to the diameter of the line element. For example, the fastening element is an annular element such as a pipe clamp, which at least partially surrounds and/or clamps the line element after assembly. By using a variable fastening element such as a pipe clamp, the absorber unit can be mounted on line elements with different diameters. The absorber unit with the pipe clamp covers a wide diameter range with regard to the line elements. It is not necessary to provide different absorber units or holding devices for each line diameter. Installing the absorber unit using the pipe clamp is very simple and can be carried out quickly by anyone without specialist training.

The pipe clamp can include any pipe clamp. For example, it is made in one part or in two parts. For example, an upper part of the pipe clamp with two-part clamps can be attached to a lower part with two screws. In the case of a one-piece pipe clamp, an upper part and a lower part can be movably connected to one another with a hinge, the open ends being able to be connected to one another using, for example, a clamping screw or a snap lock.

Preferably, the connecting element is a spacer, for example in the form of a strut or a tubular element, which determines the distance of the fastening element, for example. B. defines or determines the pipe clamp to the absorber element (and thus determines the distance between the line element and absorber element in the assembled state). The cross section of the connecting element can also have any other conceivable shape.

Particularly preferably, the holding element has at least 2, 3 or 4 connecting elements which protrude from the fastening element to the absorber element. The connecting elements preferably project radially outwards from the fastening element Absorber element. The connecting elements are preferably arranged distributed at uniform intervals on the outer surface of the fastening element.

Preferably, the connecting element is firmly connected to the fastening element, for example by welding and/or releasably connected to the absorber element, for example by a screw connection or a clamping or click connection.

Preferably, the fastening element is an annular element and the absorber element is aligned equidistant or substantially equidistant from the annular element, in particular the absorber element being curved and the center of the curvature being aligned coaxially with the annular element.

The fastening element is preferably held in a position coaxial with the absorber element by the connecting elements. The connecting elements preferably project radially outwards from the annular element to the absorber element. The connecting elements are preferably arranged at uniform intervals around the circumference of the pipe clamp.

The holding device preferably has a first and second holding element, the first and second holding elements being arranged on opposite end regions of the absorber element. The holding device can also have more than the first and second holding elements, with the further holding elements being arranged between the first and second holding elements on the absorber element.

The individual holding elements are preferably arranged coaxially to one another so that the absorber unit with all holding elements can be mounted on a preferably straight line element.

By providing a variable fastening element such as a pipe clamp, tolerances along the line element, such as varying outside diameters between the holding elements, can preferably be compensated for.

The absorber element preferably has at least one layer made of a perforated sheet metal, in particular a sheet made of steel, aluminum or stainless steel. The perforations can be designed as holes or preferably as slots. The perforations are preferably arranged evenly distributed over the entire or substantially entire absorber element. When the sound waves or the When the sound hits the perforations, the sound waves are weakened and the sound in the room is reduced.

The perforated sheet metal preferably attenuates or reduces sound waves with low and medium frequencies.

The perforated sheet can be hygienically cleaned with a cleaning agent such as an acid or alkali. For example, the absorber unit or the absorber element can simply be sprayed with the cleaning agent. The holding device is preferably also made of an acid and alkali-resistant material, for example aluminum, steel or stainless steel such as stainless steel 1.4301. This means that the entire absorber unit can be easily cleaned by spraying. The cleaning can take place in the assembled state of the absorber unit or the absorber element or in a dismantled state of the absorber element.

The absorber element preferably has a first layer and a second layer, both layers or at least one of the layers being formed from a perforated sheet metal, the second layer being arranged on a side of the first layer facing away from the holding device, and preferably has a third layer on, which is arranged between the first and second layers, the third layer preferably being made of a good sound-absorbing material. For example, made of a nonwoven material, a felt material or a porous material.

The individual layers can be connected to one another via fastening elements such as screws. Alternatively, a frame element can be provided in which the individual layers are accommodated, the frame element as such being mounted on the holding device.

Compared to the single-layer structure, the multi-layer structure can further reduce the sound or sound waves that strike the absorber element.

The sound-absorbing absorber can, for example, have mineral wool or glass wool or resin foam, in particular melamine resin foam, which is preferably sealed in a commercially available plastic film (this is particularly necessary when used in a room or building with increased hygiene and/or clean room requirements, such as the food industry) . The sound-absorbing absorber can achieve absorption of high-frequency sound waves.

By combining sound-absorbing absorbers and perforated sheet metal, a broadband reduction in sound waves, i.e. from low to high frequencies, can be achieved.

In a room or building with increased hygiene and/or clean room requirements, such as the food industry, a sound-absorbing absorber must be sealed in foil in order to meet the hygiene standards. If the film is damaged, the absorber must be replaced. The perforated sheet metal (preferably the first and second layers arranged on both sides of the sound-absorbing absorber) serves as protection against mechanical damage or abrasion of the sound-absorbing absorber and its protective film.

Preferably, two opposing layers are arranged spaced apart from one another. The distance between the two layers (for example between the first and second layers, or if there is a third layer between the first and third and the third and second layers) corresponds to the distance between the opposing surfaces of the two layers. For example, the distance is in a range of 0-2 cm, 1-3 cm, 2-4 cm, 3-5 cm, 4-6 cm, 5-7 cm, 6-8 cm or 7-10 cm. This creates air gaps or air cushions between the individual layers, which promote sound reduction.

The material or the surfaces of the absorber element and/or the absorber unit are preferably designed to be alkali-resistant and/or acid-resistant and/or CIP-treatable (CIP = Cleaning in Place) and/or tear-resistant. This makes it possible to easily clean the absorber unit or the absorber element using any cleaning agent. In particular, cleaning can be carried out on site without having to dismantle the absorber unit or the absorber element.

Furthermore, an arrangement is provided, wherein the arrangement has: at least one line element, which is arranged in a room or building, preferably a room or building with increased hygiene and / or clean room requirements, and at least one absorber unit according to one of the preceding claims, wherein the holding device of the absorber unit is attached or mounted on the line element.

Preferably, the holding device is attached or mounted on the line element so that the absorber element is arranged at a distance from the line element. Particularly The holding device is preferably mounted on the line element in such a way that the absorber element faces a wall of the room or building. If the line element is arranged near a wall, the absorber element is preferably arranged on the side of the line element opposite the wall.

Preferably, a large number of absorber units are arranged one behind the other on the line element, for example at least 2, 3, 4, 5, 6, 7 or 8 absorber units.

A large number of line elements can also be arranged in the building, for example several line elements arranged parallel to one another. At least one absorber unit can be arranged on at least two line elements. At least one absorber unit is preferably arranged on each line element.

On the line elements, which are arranged on the outside in the case of several parallel line elements (i.e. in the case of two line elements arranged in parallel on both line elements), the absorber units can be arranged not only below or above the line elements, but also laterally. This is also possible with stand-alone line elements (i.e. no other line elements are arranged next to them).

Preferably, the absorber units are distributed as evenly as possible in the room or building in order to achieve an optimal reduction in sound. Particularly preferably, the sum of all areas of the absorber units arranged in the room (i.e. the surface of the absorber elements) corresponds to at least 50, 60, 70 or 75% of the surface of the room or the building.

Individual features disclosed above or below in this specification or in the claims may be claimed in any combination or sub-combination with one another. Features of the absorber unit and the arrangement(s) can be combined with one another as a single feature or in any subcombination of features. When the conjunction "and/or" is used here, all logical elements and combinations are revealed individually; for example, a, b and/or c discloses the elements/combinations a, b, c, ab, ac, bc and abc.

Fig. 1

eine schematische perspektivische Ansicht einer schallabsorbierenden Absorbereinheit,

Fig. 2

eine schematische Schnittansicht der Absorbereinheit aus Fig. 1 entlang der Schnittebene D,

Fig. 3

eine schematische Seitenansicht der schallabsorbierenden Absorbereinheit aus Fig. 1 von unten,

Fig. 4

eine schematische perspektivische Seitenansicht des äußeren Rahmenelements mit Gitter- oder Lochplattenelement,

Fig. 5

eine schematische Seitenansicht des äußeren Rahmenelements aus Fig. 4 von hinten,

Fig. 6

eine schematische Seitenansicht des äußeren Rahmenelements aus Fig. 4 von unten,

Fig. 7

eine schematische perspektivische Seitenansicht des inneren Rahmenelements,

Fig. 8

eine schematische Seitenansicht des inneren Rahmenelements aus Fig. 7 von oben,

Fig. 9

eine schematische perspektivische Explosionsansicht der Absorbereinheit aus Fig. 1,

Fig. 10

eine schematische perspektivische Seitenansicht einer Baffleanordnung mit zwei Absorbereinheiten aus Fig. 1 getrennt durch ein Zwischenelement,

Fig. 11

eine schematische Seitenansicht einer weiteren schallabsorbierenden Absorbereinheit,

Fig. 12

eine schematische Schnittansicht der Absorbereinheit aus Fig. 11 entlang der Schnittlinie A-A,

Fig. 13

eine schematische Seitenansicht einer weiteren schallabsorbierenden Absorbereinheit,

Fig. 14

eine schematische Querschnittsdarstellung eines Absorberelements,

Fig. 15

eine schematische Draufsicht einer Anordnung mit Absorbereinheiten aus Fig. 11, und

Fig. 16

eine schematische Seitenansicht einer Anordnung mit der Absorbereinheit aus Fig. 11.

Embodiments of the invention are explained in more detail using figures. Show it:

Fig. 1

a schematic perspective view of a sound-absorbing absorber unit,

Fig. 2

a schematic sectional view of the absorber unit Fig. 1 along the cutting plane D,

Fig. 3

a schematic side view of the sound-absorbing absorber unit Fig. 1 from underneath,

Fig. 4

a schematic perspective side view of the outer frame element with grid or perforated plate element,

Fig. 5

a schematic side view of the outer frame element Fig. 4 from behind,

Fig. 6

a schematic side view of the outer frame element Fig. 4 from underneath,

Fig. 7

a schematic perspective side view of the inner frame element,

Fig. 8

a schematic side view of the inner frame element Fig. 7 from above,

Fig. 9

a schematic perspective exploded view of the absorber unit Fig. 1 ,

Fig. 10

a schematic perspective side view of a baffle arrangement with two absorber units Fig. 1 separated by an intermediate element,

Fig. 11

a schematic side view of another sound-absorbing absorber unit,

Fig. 12

a schematic sectional view of the absorber unit Fig. 11 along the section line AA,

Fig. 13

a schematic side view of another sound-absorbing absorber unit,

Fig. 14

a schematic cross-sectional representation of an absorber element,

Fig. 15

a schematic top view of an arrangement with absorber units Fig. 11 , and

Fig. 16

a schematic side view of an arrangement with the absorber unit Fig. 11 .

Fig. 1 shows a schematic perspective view of a sound-absorbing absorber unit 30 and Fig. 3 a schematic side view of the sound-absorbing absorber unit Fig. 1 from underneath. The absorber unit 30 is used to absorb sound in a room or building, in particular in a room or building with increased hygiene and/or clean room requirements such as the food processing industry. The absorber unit 30 has: a flat, sound-absorbing absorber element 32, a flat grid or perforated plate element 34, and a frame element 36, 38, 40 (see Figures 2 or 4 ), which holds and connects the absorber element 32 and the grid or perforated plate element 34 to one another. A side surface of the absorber element 32 is arranged parallel to a side surface of the grid or perforated plate element 34.

Fig. 2 shows a schematic sectional view of the absorber unit Fig. 1 along the section plane D. The frame element 36 has an inner and an outer frame element 38, 40, the inner and outer frame elements 38, 40 being arranged parallel to one another and the inner frame element 40 being completely or substantially completely accommodated in the outer frame element 38 . In particular, the inner frame element 40 is removably inserted into the outer frame element and the absorber element 32 is removably inserted into the inner frame element 40. As in Fig. 2 shown is the grid or perforated plate element 34 spaced from an opposite side surface of the absorber element 32 by an air gap L1 and a side surface of the absorber element 32 facing away from the grid or perforated plate element 34 spaced from a third side surface 38c by an air gap L2. Through the Air gaps promote a weakening of the sound waves that penetrate the absorber unit.

The thickness of the absorber element can be, for example, in the range of 20-60 mm, 40-80 mm, 60-120 mm or 100-150 mm and/or the total thickness of the absorber unit is preferably 80-120 mm, 100-200 mm, 120- 250mm or essentially 100mm. For example, the distance L1 and/or L2 is 20 mm or essentially 20 mm.

Fig. 4 shows a schematic perspective side view of the outer frame element 38 with the grid or perforated plate element 34. The grid or perforated plate element 34 is held by the outer frame element 38 or is connected to it. Preferably, the grid or perforated plate element 34 is releasably connected to the outer frame element 38 or is held by it. The outer frame element 38 is preferably formed by the grid or perforated plate element 34, the side surface 38c opposite and parallel to the grid or perforated plate element 34 and by at least a first side surface 38b and a second side surface 38b opposite the first side surface 38a, 38b. The first and second side surfaces 38a, 38b each connect opposite outer edges of the grid or perforated plate element 34 and the third side surface 38c to one another. The first and second side surfaces 38a, 38b are preferably perpendicular to the grid or perforated plate element 34 and the third side surface 38c.

The outer frame element 38 forms a first lateral guide 44a which is designed to accommodate two opposite side surfaces of the inner frame element 40. As in Fig. 5 shown, the grid or perforated plate element 34 and the first, second and third side surfaces 38a-c enclose a volume between them in which the absorber element 32 is accommodated.

The first and second side surfaces 38a, 38b can have opposing fastening elements 42a, which are used to mount the absorber unit on a ceiling, for example. The fastening elements 42a are preferably arranged at an end region of the side surfaces 38a, 38b.

The third side surface is preferably at least partially open. For example, the third side surface has a rectangular or square opening 50 - see Fig. 5 . When installing the absorber unit 30 on a wall or ceiling the sound waves leave the absorber unit through the opening and are then reflected on the wall or ceiling and penetrate the absorber unit 30 again. The double passage of sound through the absorber unit promotes the absorption of the sound waves.

Alternatively or in addition to the fastening elements 42a, the third side surface 38c can have fastening elements 42b in the form of openings, for example slots as in Fig. 5 can be seen, which are used to mount the absorber unit on a wall and / or ceiling. For example, a holding device with hook elements can be mounted on the wall and the absorber unit 30 can be hung on the hook elements using the slots 42b.

The frame element 38 is preferably designed to be open on a side surface that is perpendicular to the first and second side surfaces 38a, 38b, so that the inner frame element 40 with the absorber element 32 can be inserted through the open side surface into the outer frame element 38.

As in Fig. 6 As can be seen, the outer frame element 38 is preferably designed to be at least partially closed on a side surface opposite the open side surface (for example by inwardly projecting stop elements 48), so that the inner frame element 40 with the absorber element 32 is in an end position when pushed into the outer frame element 38 is held.

As in Fig. 4 shown, the grid or perforated plate element 34 is preferably a micro-perforated sheet metal, which is made, for example, from stainless steel or aluminum. The sheet may have a thickness of or substantially 0.7 mm, 1 mm, 1.25 mm, 1.5 mm or 2.0 mm. The grid or perforated plate element 34 serves as protection against mechanical damage or abrasion of the absorber element 32 and in particular the film that encloses the absorber element 32. In the example shown, the grid or perforated plate element 34 is trapezoidally corrugated to increase its inherent stability.

Fig. 7 shows a schematic perspective side view of the inner frame element 40. The inner frame element 40 forms a second lateral guide 44b which is designed to receive two opposite side edges or surfaces of the absorber element 32. As in Fig. 7 shown, the second guide 44b has guide elements 46 which are arranged on opposite sides. The guide elements 46 are preferably U-profiles that extend towards the interior of the inner frame element 40 are open. Two U-profiles 46 are arranged on each side, each of which is connected to one another via a connecting element 41a, 41b, for example connecting rails. The connecting elements 41a, 41b are preferably arranged parallel to one another.

A first end region of the first connecting element 41a is preferably connected to an opposite first end region of the second connecting element 41b by means of third connecting elements 41c. A second end region of the first connecting element 41a is preferably connected to an opposite second end region of the second connecting element 41b by means of fourth connecting elements 41d.

Preferably, the third and fourth connecting elements 41c, 41d are arranged perpendicular to the first and second connecting elements 41a, 41b. The third and fourth connecting elements 41c, 41d are preferably arranged on the connecting rails 41a, 41b in such a way that a space for receiving the absorber element 32 is formed between the guide elements. For example, the third and fourth connecting elements 41c, 41d are arranged outside the legs of the U-profiles 46, ie to the left and right of the legs of the U-profiles 46. As in Fig. 7 As can be seen, the third and fourth connecting elements 41c, 41d can be designed, for example, as rod elements. The inner frame element 40 is designed to be open on at least one side parallel to the connecting rails 41a, 41b, so that the absorber element can be inserted through the open side into the interior of the inner frame element 40.

Fig. 8 shows a schematic side view of the inner frame element Fig. 7 from above. The inner frame element 40 is preferably on a side surface (in Fig. 7 on the underside) at least partially closed (for example by inwardly projecting stop elements 49). The stop elements 49 hold the absorber element 32 in an end position when it is pushed into the inner frame element 40.

Fig. 9 shows a schematic perspective exploded view of the absorber unit Fig. 1 . The absorber element 32 shown has a flat core made of a sound-absorbing material and a film surrounding the core on the outside, for example made of LDPE. The core can be formed, for example, from a nonwoven material (e.g. mineral wool or rock wool), felt material or a porous material (e.g. porous mineral material). The film preferably completely encloses the core is preferably designed to be water and vapor tight. This can prevent bacteria and/or contaminants from getting into the core of the absorber element. The absorber element 32 can therefore be cleaned easily and quickly from the outside and is therefore also suitable for use in a room or building with increased hygiene and/or clean room requirements, such as the food industry.

Furthermore, you can use the Fig. 9 the assembly steps of the absorber unit 30 are explained. The absorber element 32 is guided by the second guide 44b along an insertion direction E and is removably inserted into the inner frame element 40. The inner frame element 40 with the inserted absorber element 32 is removably inserted into the outer frame element 38 along the insertion direction E by means of the guide 44a. The insertion direction E runs as in Fig. 9 can be seen parallel to the side guides 44a, 44b.

Fig. 10 shows a schematic perspective side view of a baffle arrangement with two of the absorber units Fig. 1 . The arrangement 52 has a first and second absorber unit 30a, 30b, which corresponds to the structure in the Figures 1 to 9 corresponds to the absorber unit described. The arrangement 52 has an intermediate element or an intermediate plate 54, the first absorber unit 30a being connected to a first side surface of the intermediate element 54 and the second absorber unit 30b being connected to a second side surface of the intermediate element 42 which is opposite the first side surface. Preferably, the intermediate element, in particular the intermediate plate, is soundproof and reflects the incident sound well.

The absorber units 30a, 30b are each mounted in such a way that the grid or perforated plate elements 34 of the first and second absorber elements 30a, 30b are each arranged facing away from the intermediate element 54. As in Fig. 10 The absorber units 30a, 30b are shown arranged symmetrically to the intermediate element 54.

The intermediate element 54 has a section 54a which protrudes beyond the absorber units 30a, 30b, in which section 54a fastening means 42 can be arranged, which are used to mount the arrangement 52 on, for example, a ceiling.

The sound waves that have penetrated the first and second absorber units 30a, 30b are reflected on opposite side surfaces of the intermediate element 54 and thus penetrate the absorber units 30a, 30b again. Thus the sound waves absorbed again by the absorber units 30a, 30b and there is an increased overall absorption of the sound waves.

Fig. 11 is a schematic side view of a sound-absorbing absorber unit 2 and Fig. 12 is a schematic sectional view of the absorber unit Fig. 11 along section line AA.

The absorber unit 2 for absorbing sound in a room or building or a machine housing has a sound-absorbing absorber element 6 and a holding device 8 on which the absorber element 6 is mounted, preferably releasably. The holding device 8 is designed to be mounted on a line element 14, so that the absorber element 6 is arranged at a distance from the line element 14 (see Fig. 12 ). As in Fig. 11 Shown are non-attenuated sound waves 4a, which hit the absorber element 6 from the outside (ie the side facing away from the holding device 8), are attenuated as they pass through the absorber element 6 and leave the absorber element 6 on the side facing the holding device 8 as weakened sound waves 4b. As in Fig. 11 shown, the attenuated sound waves 4b can continue to hit the line element 14 and be reflected on it. The line element 14 forms a sound-hard back for the absorber unit 2. The reflection on the line element 14 results in a further attenuation of the sound waves.

As shown, the holding device 8 has, for example, a first and a second holding element 10a, 10b. The first and/or second holding element 10a, 10b preferably has a fastening element 12 for fastening to the line element 14 and/or at least one connecting element (spacer) 13 for connecting the fastening element 12 to the absorber element 6. The first holding element 10a is arranged on a first end region of the absorber element 6 and the second holding element 10b on a second end region of the absorber element 6 opposite the first end region (see Fig. 12 ). Further holding elements can be arranged between the first and second holding elements 10a, 10b. Alternatively, the absorber element 6 can have only one holding element, which is preferably arranged in the center or almost in the center of the absorber element. As in Fig. 11 What can be seen is the fastening element 12, preferably an annular element (here exemplified as a pipe clamp).

The absorber element 6 is preferably designed as a curved or curved plate element. In particular, the entire surface of the absorber element is preferably bent or curved with a predetermined bending radius. As in Fig. 11 and 12 You can see the absorber element 6 designed as a section of a tube or cylinder wall that does not span the entire azimuthal circumference. The non-spanned area of the circumference preferably faces the holding device 8. The curvature of the absorber element 6 runs along a curvature curve and is arcuate or designed as a polygon following an arcuate curvature or as a section of a parabola, with the two ends of the curvature curve measuring from the center of the curvature forming an arc or azimuthal angle α (curvature angle). include, which in the case shown is 180°. The circumference of the section of the pipe or cylinder wall therefore covers an angle of 180°. Alternatively, the arc angle α can be in a range of 0 - 90°, 30 - 120°, 60 - 150°, 90 - 180°, 140 - 230° or 190 - 270°.

In the case shown, the absorber element 6 consists of a single layer 16, which is preferably formed from a perforated sheet metal. Particularly preferably, the absorber element 6 is aligned equidistant or substantially equidistant from the annular element 12, i.e. the center of the curvature or the central axis C of the curvature is aligned coaxially with the absorber element 6. In the assembled state of the absorber unit 2, the distance a between the absorber element 6 and the line element 14 or the fastening element 12 (without taking into account the connecting element(s) 13) is preferably in a range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm, particularly preferably the distance is 100 mm.

The connecting elements 12 preferably project radially outward from the outer surface of the fastening element 12 to the inside of the absorber element 6. In the case shown, the holding elements 10a, 10b each have three connecting elements 13, which are preferably arranged at equal distances from one another. Alternatively, only 1 or 2, or 4, 5 or 6 connecting elements can be provided.

In Fig. 12 the absorber unit 2 is shown in the assembled state on a line element 14, for example a pipeline. The absorber element 6 has an extension along the longitudinal axis B of the line element 14. In the case shown, the central axis C of the curvature is arranged coaxially to the longitudinal axis B of the pipeline.

Fig. 13 is a schematic side view of another sound-absorbing absorber unit. In comparison to absorber unit 2 Figures 11 and 12 , is the design of the connecting elements 13 of the absorber unit 2 in Fig. 13 different. In Fig. 13 the connecting elements 13 are made longer, which results in a larger distance a between the absorber element 6 and the line element 14. As a result, the fastening element 12 in this embodiment is not arranged equidistant from the absorber element 6 and the center axis C of the curvature of the absorber element 6 is not arranged coaxially with the line element 14 (ie center axis C and longitudinal axis B of the line element 14 are not congruent), but rather parallel with a distance b offset. The center axis C is shifted vertically upwards and parallel to the longitudinal axis B by the distance b. In the absorber unit 2 of the Figures 11 and 12 the distance b is equal to zero, since the center axis C of the curvature of the absorber element 6 is arranged coaxially with the line element 14 (ie the center axis C is congruent with the longitudinal axis B of the line element 14).

Fig. 14 shows the absorber unit 2 Fig. 13 with a further absorber element 2 and a connecting element 13. In comparison to Fig. 14 is in the Figures 11 to 13 the absorber element is designed as a single-layer element. As in Fig. 14 shown, the absorber element 6 can alternatively also be designed in multiple layers. For example, the absorber element 6 can have a first layer 16 and a second layer 18, with both layers 16, 18 or at least one of the layers being made of a perforated sheet metal, and with the second layer 18 on one of the holding devices or the connecting element 13 facing side of the first layer 16 is arranged. For example, the first layer 16 can have a perforated sheet and the second layer can have a sound-absorbing absorber. As in Fig. 14 shown, the absorber element 6 can additionally have a third layer 20, which is arranged between the first and second layers 16, 18, the third layer 20 preferably being formed from a sound-absorbing absorber. For example, the absorber element 6 can be designed in three layers, with the first layer 16 and second layer 18 each being formed by a perforated sheet and the third layer 20 by a sound-absorbing absorber. Preferably there are two opposing layers 16, 18, 20 (ie in Fig. 14 the first layer 16 and the third layer 20 and/or the third layer 20 and the second layer 18) are arranged at a distance from one another. This creates an air cushion between the individual layers, which in turn promotes sound reduction.

The absorber element 6 can also have more than the three layers 16, 18, 20 described above. The first layer 16 (ie the side facing away from the holding device 8 The outermost layer of the absorber element 6) is preferably made of a perforated sheet metal. All other layers can be made from a perforated sheet metal or a sound-absorbing absorber. Any combinations are conceivable. Preferably, an air gap is formed between opposing layers.

The combination of perforated sheet metal and sound-absorbing absorber can achieve a broadband sound reduction from low to high frequencies. Preferably, the material or surfaces of the absorber element 6 and/or the absorber unit are designed to be alkali-resistant and/or acid-resistant and/or CIP-treatable. For example, the first and second layers 16, 18 or, in the case of a single-layer absorber element 6, the absorber element 6 are made of steel and preferably stainless steel. Alternatively or additionally, the spacers 13 and/or the fastening element 12 are made of steel, preferably stainless steel.

The individual layers are preferably arranged or clamped in a frame element 22 and the holding device or the connecting elements 13 of the holding device are attached to the frame element 22.

Fig. 15 shows a schematic top view of an arrangement with absorber units 2 Fig. 11 . Several line elements 14 arranged parallel to one another are shown. Several absorber elements 2 can be arranged one behind the other on a line element 14. At least one absorber unit 2 is preferably arranged on each of the line elements.

Fig. 16 is a schematic side view of an arrangement with the absorber unit 2 Fig. 11 .

The line element 14 is near a wall 24 arranged. In Fig. 16 the absorber unit 2, in particular the absorber element 6, is arranged on the side of the line element 14 facing away from the wall 24.

A sound reflection and attenuation S of a sound wave is in Fig. 16 shown as an example. At least some of the sound waves that impinge on the absorber element 6 can pass through the absorber element 6 in the direction of the line element 14, the sound waves being attenuated by the absorber element 6. At least some of the attenuated sound waves can be on the side of the holding device 8 also hit the line element 14 and are reflected on it. The line element 14 forms a sound-hard back for the absorber unit 2. The reflection on the line element 14 results in a further attenuation of the sound waves. The sound waves striking the line element 14 are reflected from the line element 14 back to the absorber element 6. In this way, the sound waves can be reflected back and forth several times between the absorber element 6 and the line element 14 (ie multiple sound reflection) before they pass through the absorber element again, thereby weakening or attenuating the sound. If the absorber element 6 is designed as a parabolic section with a focal line coaxial with the line 14 or with the holding element 12, the multiple sound reflection and thus attenuation is further increased.

• A1. Schallabsorbierende Absorbereinheit (2) zum Absorbieren von Schall (4a) in einem Raum oder Gebäude oder einer Maschineneinhausung, insbesondere in einem Raum oder Gebäude mit erhöhten Hygiene- und/oder Reinraumanforderungen oder einer Maschineneinhausung in einem solchen Raum oder Gebäude, wobei die Absorbereinheit aufweist: ein schallabsorbierendes Absorberelement (6), und eine Halteeinrichtung (8), an der das Absorberelement (6), vorzugsweise lösbar, montiert ist, und die dazu ausgestaltet ist, um an einem Leitungselement (14) montiert zu werden, so dass das Absorberelement (6) mittels der Halteeinrichtung beabstandet zum Leitungselement (14) angeordnet ist.
• A2. Absorbereinheit nach Ausführung A1, wobei das Absorberelement (6) ein gekrümmtes bzw. gebogenes Plattenelement ist.
• A3. Absorbereinheit nach Ausführung A1 oder A2, wobei die Fläche, insbesondere die Gesamtfläche, des Absorberelements (6) gebogen oder gekrümmt ist, insbesondere mit einem vorgegebenen Biegeradius gebogen oder gekrümmt ist.
• A4. Absorbereinheit nach Ausführung A2 oder A3, wobei die Krümmung entlang einer Krümmungskurve verläuft und bogenförmig oder kantig ausgestaltet ist, und wobei gemessen vom Zentrum der Krümmung die beiden Enden der Krümmungskurve einen Winkel (α) einschließen, der in einem Bereich von 0 - 90°, 30 - 120°, 60 - 150°, 90 - 180°, 140 - 230° oder 190 - 270° liegt, vorzugsweise 180° oder im Wesentlichen 180° beträgt.
• A5. Absorbereinheit nach einer der Ausführungen A1 bis A4, wobei das Absorberelement (6) einen Ausschnitt einer Rohr- oder Zylinderwand und/oder die Krümmung im Schnitt einen Bogenabschnitt oder Parabelabschnitt ausbildet, der nicht den gesamten Umfang umspannt.
• A6. Absorbereinheit nach einer der Ausführungen A1 bis A5, wobei im montierten Zustand der Absorbereinheit (2) der Abstand zwischen dem Absorberelement (6) und dem Leitungselement (14) oder dem mit einem Leitungselement (14) verbindbaren Teil der Halteeinrichtung (8) oder dem Befestigungselement (12) vorzugsweise in einem Bereich von 80 - 140 mm, 100 - 160 mm, 120 - 180 mm oder 140 - 200 mm liegt, besonders bevorzugt 100 mm beträgt, wobei vorzugsweise zumindest 50%, 65%, 80% oder 90% der Gesamtoberfläche der Absorbereinheit in oder im Wesentlichen in einem Abstandsbereich von 80 - 140 mm, 100 - 160 mm, 120 - 180 mm oder 140 - 200 mm von dem oder einem Befestigungselement (12) der Halteeinrichtung (8) liegt.
• A7. Absorbereinheit nach einer der Ausführungen A1 bis A6, wobei die Halteeinrichtung (8) zumindest ein Halteelement (10a, 10b) mit einem Befestigungselement (12) zum Befestigen an dem Leitungselement (14) und/oder zumindest ein Verbindungselement (13) zum Verbinden des Befestigungselements (12) mit dem Absorberelement (6) aufweist, wobei insbesondere das Verbindungselement (13) von dem Befestigungselement (12) mit einer Länge im Bereich von 80 - 140 mm, 100 - 160 mm, 120 - 180 mm oder 140 - 200 mm nach Außen absteht.
• A8. Absorbereinheit nach Ausführung A7, wobei das Befestigungselement (12) ein ringförmiges Element ist und das Absorberelement (6) äquidistant oder im Wesentlichen äquidistant zum ringförmigen Element (12) ausgerichtet ist, wobei insbesondere das Absorberelement (6) gekrümmt ist und das Zentrum der Krümmung koaxial zum ringförmigen Element (12) ausgerichtet ist, und/oder wobei die Halteeinrichtung (8) ein erstes und zweites Halteelement (10a, 10b) aufweist, und wobei das erste und zweite Halteelement (10a, 10b) an sich gegenüberliegenden Endbereichen des Absorberelements (6) angeordnet sind.
• A9. Absorbereinheit nach einer der Ausführungen A1 bis A8, wobei das Absorberelement (6) zumindest eine Lage (16, 18) aus einem perforierten Blech, insbesondere einem Blech aus Stahl, Aluminium oder Edelstahl, aufweist.
• A10. Absorbereinheit nach einer der Ausführungen A1 bis A9, wobei das Absorberelement (6) aufweist: eine erste Lage (16) und eine zweite Lage (18), wobei beide Lagen oder zumindest eine der Lagen aus einem perforierten Blech ausgebildet ist, wobei die zweite Lage (18) an einer der Halteeinrichtung (8) zugewandten Seite der ersten Lage (16) angeordnet ist, und vorzugsweise eine dritte Lage (20), die zwischen der ersten und zweiten Lage (16, 18) angeordnet ist, wobei die dritte Lage vorzugsweise aus einem schallabsorbierenden Absorber ausgebildet ist; wobei vorzugsweise zwei gegenüberliegende Lagen (16, 18, 20) zueinander beabstandet angeordnet sind.
• A11. Absorbereinheit nach einer der Ausführungen A1 bis A10, wobei das Material oder die Oberflächen des Absorberelements (6) und/oder der Absorbereinheit (2) laugenbeständig und/oder säurebeständig und/oder CIP-behandelbar und/oder reißfest ausgebildet sind, und/oder wobei die Absorbereinheit und/oder die zumindest eine Halteeinrichtung (8) aus Stahl, Aluminium oder Edelstahl ausgebildet ist/sind.
• A12. Anordnung, die aufweist: zumindest ein Leitungselement (14), das in einem Raum oder Gebäude oder einer Maschineneinhausung, vorzugsweise einem Raum oder Gebäude mit erhöhten Hygiene- und/oder Reinraumanforderungen oder einer Maschineneinhausung in einem solchen Raum oder Gebäude, angeordnet ist, und zumindest eine Absorbereinheit (2) nach einem der vorhergehenden Ansprüche, wobei die Halteeinrichtung (8) der Absorbereinheit (2) an dem Leitungselement (14) befestigt bzw. montiert ist so dass das Absorberelement (6) beabstandet zum Leitungselement angeordnet ist.
• A13. Anordnung nach Ausführung A13, wobei, wenn das Leitungselement in der Nähe einer Wand (24) angeordnet ist, bezüglich des Leitungselements (14) das Absorberelement (6) auf der der Wand (24) gegenüberliegenden Seite angeordnet ist.

Further embodiments are described below, to which claims of the present application or a divisional application can be directed.

• A1. Sound-absorbing absorber unit (2) for absorbing sound (4a) in a room or building or a machine enclosure, in particular in a room or building with increased hygiene and/or clean room requirements or a machine enclosure in such a room or building, the absorber unit having: a sound-absorbing absorber element (6), and a holding device (8), on which the absorber element (6) is mounted, preferably releasably, and which is designed to be mounted on a line element (14), so that the absorber element ( 6) is arranged at a distance from the line element (14) by means of the holding device.
• A2. Absorber unit according to version A1, wherein the absorber element (6) is a curved or bent plate element.
• A3. Absorber unit according to version A1 or A2, wherein the surface, in particular the total surface, of the absorber element (6) is bent or curved, in particular is bent or curved with a predetermined bending radius.
• A4. Absorber unit according to version A2 or A3, wherein the curvature runs along a curvature curve and is arcuate or angular, and where, measured from the center of the curvature, the two ends of the curvature enclose an angle (α) which is in a range of 0 - 90 °, 30 - 120°, 60 - 150°, 90 - 180°, 140 - 230° or 190 - 270°, preferably 180° or substantially 180°.
• A5. Absorber unit according to one of the versions A1 to A4, wherein the absorber element (6) has a section of a pipe or cylinder wall and/or the Curvature in the section forms an arc section or parabolic section that does not span the entire circumference.
• A6. Absorber unit according to one of the versions A1 to A5, wherein in the assembled state of the absorber unit (2) the distance between the absorber element (6) and the line element (14) or the part of the holding device (8) that can be connected to a line element (14) or the fastening element (12) is preferably in a range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm, particularly preferably 100 mm, preferably at least 50%, 65%, 80% or 90% of the Total surface of the absorber unit is in or essentially in a distance range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm from the or a fastening element (12) of the holding device (8).
• A7. Absorber unit according to one of versions A1 to A6, wherein the holding device (8) has at least one holding element (10a, 10b) with a fastening element (12) for fastening to the line element (14) and / or at least one connecting element (13) for connecting the fastening element (12) with the absorber element (6), in particular the connecting element (13) being separated from the fastening element (12) with a length in the range of 80 - 140 mm, 100 - 160 mm, 120 - 180 mm or 140 - 200 mm protrudes outside.
• A8. Absorber unit according to version A7, wherein the fastening element (12) is an annular element and the absorber element (6) is aligned equidistant or substantially equidistant from the annular element (12), in particular the absorber element (6) being curved and the center of the curvature being coaxial is aligned with the annular element (12), and/or wherein the holding device (8) has a first and second holding element (10a, 10b), and wherein the first and second holding elements (10a, 10b) are located on opposite end regions of the absorber element (6 ) are arranged.
• A9. Absorber unit according to one of versions A1 to A8, wherein the absorber element (6) has at least one layer (16, 18) made of a perforated sheet, in particular a sheet made of steel, aluminum or stainless steel.
• A10. Absorber unit according to one of versions A1 to A9, wherein the absorber element (6) has: a first layer (16) and a second layer (18), both layers or at least one of the layers being formed from a perforated sheet, the second layer (18) is arranged on a side of the first layer (16) facing the holding device (8), and preferably a third layer (20) which is arranged between the first and second layers (16, 18), the third layer preferably is formed from a sound-absorbing absorber; wherein preferably two opposite layers (16, 18, 20) are arranged spaced apart from one another.
• A11. Absorber unit according to one of versions A1 to A10, wherein the material or the surfaces of the absorber element (6) and/or the absorber unit (2) are alkali-resistant and/or acid-resistant and/or CIP-treatable and/or tear-resistant, and/or wherein the absorber unit and/or the at least one holding device (8) is/are made of steel, aluminum or stainless steel.
• A12. Arrangement, which has: at least one line element (14) which is arranged in a room or building or a machine housing, preferably a room or building with increased hygiene and / or clean room requirements or a machine housing in such a room or building, and at least an absorber unit (2) according to one of the preceding claims, wherein the holding device (8) of the absorber unit (2) is attached or mounted on the line element (14) so that the absorber element (6) is arranged at a distance from the line element.
• A13. Arrangement according to version A13, wherein if the line element is arranged near a wall (24), the absorber element (6) is arranged on the side opposite the wall (24) with respect to the line element (14).

List of reference symbols:

2

Sound-absorbing absorber unit

4a, 4b

non-attenuated (attenuated) sound waves

6

Absorber element

8th

Holding device

10a, 10b

first / second holding element

12

Fastening element (pipe clamp)

13

Connecting element/spacer

14

Line element (pipe element or line)

16

first layer (first perforated sheet)

18

second layer (second perforated sheet)

20

third layer (sound-absorbing absorber)

22

Frame element

24

Wall

30, 30a, 30b

(first / second) sound-absorbing absorber unit

32

flat absorber element

34

Grid or perforated panel element

36

Frame element

38

outer frame element

38a

first side surface of the outer frame element

38b

first side surface of the outer frame element

38c

third side surface of the outer frame element

40

inner frame element

41a-d

first / second / third / fourth connecting element

42a-c

fastener

44a, 44b

first / second lateral guidance

46

Leadership element

48, 49

stop element

50

opening

52

Baffle arrangement

54

Intermediate element

54a

outstanding sub-element

a

Distance between absorber element and tube element

b

Distance between the longitudinal axis and the line element and the center axis of the curvature/bend

α

Angle of curvature of the absorber element

b

Longitudinal axis of the line element

C

Center axis of the curvature/bending of the absorber element

E

Insertion direction of the inner frame element or the absorber element

L1, L2

air gap

S

Sound reflection and attenuation

Claims (15)

Absorber unit (30) for absorbing sound in a room or building, in particular in a room or building with increased hygiene and/or clean room requirements, the absorber unit (30) having: a flat, sound-absorbing absorber element (32), a flat grid or perforated plate element (34), a side surface of the absorber element (32) being arranged parallel to a side surface of the grid or perforated plate element (34), and a frame element (36, 38, 40) which holds and connects the absorber element (32) and the grid or perforated plate element (34) to one another. Absorber unit according to claim 1, wherein the frame element (36, 38, 40) supports the absorber element (32) and/or the grid or perforated plate element (34) on at least two opposite side edges, and/or wherein the frame element (36, 38, 40) mechanically stabilizes the absorber element (32) and / or the grid or perforated plate element (34) so that this or these are stretched flat. Absorber unit according to claim 1 or 2, wherein the absorber element (32) and/or the grid or perforated plate element (34) are removably inserted or pushed or clamped into the frame element (36, 38, 40), and/or wherein the frame element (36, 38, 40) forms a lateral guide (44a, 44b) which is designed to accommodate two opposite side edges or surfaces of the absorber element (32) and / or the grid or perforated plate element (34). Absorber unit according to one of the preceding claims, wherein the frame element (36, 38, 40) on one of the grid or perforated plate elements (34) The side facing away from the absorber element (32) is designed to be at least partially open in a direction perpendicular to the side surface of the absorber element (32). Absorber unit according to one of the preceding claims, wherein the frame element (36, 38, 40) has an outer frame element (38) and an inner frame element (40), wherein the inner and outer frame elements (38, 40) are arranged parallel to one another and the inner frame element (40) is completely or substantially completely accommodated in the outer frame element (38), and wherein the outer frame element (38) holds the grid or perforated plate element (34) and the inner frame element (40) holds the absorber element (32). Absorber unit after 5, wherein the inner frame element (40) is removably inserted or pushed into the outer frame element (38), and / or wherein the absorber element (32) is removably inserted or pushed into the inner frame element (40). Absorber unit according to claim 5 or 6, wherein the outer frame member (38) forms a first lateral guide (44a) configured to receive two opposing side edges or surfaces of the inner frame member (40), and/or wherein the inner frame element (40) forms a second lateral guide (44b) which is designed to receive two opposite side edges or surfaces of the absorber element (32), and / or wherein the inner frame element (40) is at least partially open in a direction perpendicular to the grid or perforated plate element (34) and the outer frame element (38) is at least partially open on a side surface (38c) of the outer frame element opposite the grid or perforated plate element is. Absorber unit according to claim 7, wherein the first guide (44a) has opposing U-profiles which are open towards the interior of the outer frame element (38) and are designed to receive between them two opposite side edges or surfaces of the inner frame element (40), and/or wherein the second guide (44b) has opposite U-profiles (46) which are open towards the interior of the inner frame element (40) and are designed for this purpose are to accommodate two opposite side edges or surfaces of the absorber element (32) between them. Absorber unit according to one of the preceding claims, wherein the absorber element (32) has: a flat core made of a sound-absorbing material, and optionally a film surrounding the core on the outside; or wherein the absorber element (32) is formed from a micro-perforated sheet metal. Absorber unit according to claim 9, wherein the core has or is formed from: nonwoven material (e.g. mineral wool, rock wool, glass wool), felt materials (e.g. wood wool), or porous material (e.g. foam, resin foam, Basotect or porous mineral), and/or wherein the core has an absorption coefficient α ≥ 0.7 at 1 kHz, preferably α ≥ 0.8, 0.85 or 0.9. Absorber unit according to one of claims 9 to 11, wherein the film has a thickness in the range of 20-200 µm, 20-60 µm, 50-90 µm, 80-120 µm, 120-160 µm, or 140-200 µm, and / or wherein the film consists of one of the following plastic materials: polyethylene PE, preferably low density polyethylene (LDPE) or high density polyethylene (HDPE), polypropylene PP, polyamide, PET, PS, and / or wherein the thickness of the absorber element is in the range of 25-50 mm, 40-80 mm, 70-100 mm, 90-130 mm, 120-180 mm, or 160-200 mm, and / or wherein the total thickness of the absorber unit is in the range of 80-150 mm, 90-150 mm, 100-180 mm, 140-220 mm, 200-280 mm, 250-350 or 300-400 mm, the total thickness of the absorber unit preferably being 100 mm or essentially 100 mm. Absorber unit according to one of the preceding claims, wherein the grid or perforated plate element (34) is a micro-perforated sheet, and/or wherein the sheet has a thickness in the range of 0.5-0.8 mm, 0.7-1.0 mm, 0.9-1.2 mm, 1.1-1.5 mm, 1.4-1.8 mm or 1.6-2.0 mm, and preferably a thickness of or substantially 0.7 mm , 1 mm, 1.25 mm, 1.5 mm or 2.0 mm, and/or wherein the perforated plate is made of steel, aluminum or stainless steel. Absorber unit according to one of the preceding claims, wherein the grid or perforated plate element (34) and the absorber element (32) and / or the absorber element (32) and a side surface (38c) of the frame element, in particular the outer frame element (38), which is on one of the grid or perforated plate element (34 ) opposite side of the absorber element (32) is arranged parallel to the absorber element (32), are arranged at a distance from one another, and wherein preferably the distance is in a range of 10-60 mm, 10-30 mm, 20-40 mm, 30-50 mm or 40-60 mm, particularly preferably 20 mm or essentially 20 mm. Arrangement comprising: a first and second absorber unit (30a, 30b) according to one of the preceding claims, and an intermediate element (52), preferably a sound-hard intermediate plate, wherein the first absorber unit (30a) is connected to a first side surface of the intermediate element (52) and the second absorber unit (30b) is connected to a second side surface of the intermediate element (52) opposite the first side surface, and wherein the grid or perforated plate elements (34) of the first and second absorber elements (30a, 30b) are each arranged facing away from the intermediate element (52). Arranging an absorber unit on a wall or ceiling, the arrangement having: an absorber unit (30) according to one of claims 1 to 14, and at least one holder device (42a, 42b) for releasably holding the absorber unit (30) on the wall or ceiling, wherein the absorber unit (30) is mounted on the wall or ceiling by means of the holding device (42a, 42b), and wherein the grid or perforated plate element (34) faces away from the wall or ceiling.

Images