EP4389269A1 - Ventilating device - Google Patents

Abstract

A ventilation device comprises a support body (3) with two external grooves (9), each formed on a side surface (8) of the support body (3), and a membrane film (4) fastened to the support body (3) and a clamping strip (5) with which the membrane film (4) is clamped to the support body (3) by the clamping strip (5) engaging in the external groove (9).

Description

The content of the German patent application EN 10 2022 213 907.0 is incorporated herein by reference.

The invention relates to a ventilation device.

DE 94 12 161 U1 reveals a plate aerator.

WO 2004/014 532 A1 and EN 10 2012 008 800 A1 reveal a strip aerator.

EN 11 2005 001 078 B4 discloses an air distributor for introducing gas bubbles into wastewater. The air distributor comprises an aerator base plate to which an aerator membrane is held by means of a tubular locking body. In particular, since the film fastening must meet high tightness requirements, the manufacturing effort for the fastening is high. There is a risk that the film fastening is leaky.

It is the object of the present invention to provide a ventilation device which is uncomplicated to manufacture and reliable in use, in particular gas- and/or liquid-tight.

This object is achieved according to the invention by a ventilation device having the features specified in claim 1.

The essence of the invention is that a membrane film, which in particular is a pliable, flexible and/or elastic surface element is clamped to a support body by means of clamping strips. A targeted release of gas, in particular air, can take place via the membrane film for the purpose of ventilation. It was recognized that the clamping strips ensure a reliable, in particular sealing, clamping attachment of the membrane film in an outer groove of the support body. The clamping strips engage in the outer grooves of the support body and are in particular each arranged completely within the outer groove. The clamping strip is arranged in particular flush or set back with respect to a surface of the support body on which the outer groove is arranged.

The manufacture of the individual parts of the ventilation device is uncomplicated and cost-efficient. The assembly of the ventilation device is uncomplicated and fail-safe. The membrane film is in particular thin-walled, in particular with a thickness of 0.3 mm to 1.0 mm and in particular 0.4 mm to 0.8 mm. The membrane film is in particular a plastic film. The membrane film is in particular soft-elastic and in particular rubber-like. The plastic film is made, for example, from thermoplastic polyurethane (TPU) and/or from a silicone material. The membrane film has at least one passage opening, in particular several passage openings, which are large enough to release gas, in particular air, in particular from the ventilation device, in a targeted manner, but which are also small enough to prevent water from entering the ventilation device. The passage openings can be defined in terms of shape and/or size and in particular depending on the intended use of the plastic film. An outer contour of the passage openings can be star-shaped, slit-shaped or circular or point-like. The clear width of the openings can be between 0.5 mm and 2 mm.

The support body can be designed as a strip or plate. The outer grooves each extend in particular along a longitudinal axis of the support body. The support body has two, in particular identically designed outer grooves, which are formed on side surfaces that are arranged in particular opposite one another. The side surfaces are oriented in particular parallel to a longitudinal axis of the support body. The side surfaces connect in particular a bottom side of the support body, with which the support body can be arranged on a base, to an upper side of the support body, which is oriented in particular parallel to the bottom side. The side surfaces are aligned in particular transversely and in particular perpendicularly to the bottom side and in particular to the top side of the support body.

Because the outer grooves are arranged on the side surfaces, the accessibility of the outer grooves is improved, particularly with regard to the installation of the terminal strips. The clamping effect of the membrane film in the outer grooves is improved. The membrane film in particular spans the top of the support body. An interior of the ventilation device is formed between the membrane film and the top of the support body, from which gas for ventilation, in particular of waste water, can be released through the membrane film.

The plate-like design is particularly due to the fact that the support body has a base area with a length and a width that are in particular larger than a thickness of the support body. In particular, the length and/or width are at least 5 times the thickness, in particular at least 10 times, in particular at least 20 times, in particular at least 50 times and in particular at least 100 times. The base area of the support element is in particular square and in particular rectangular.

The aeration device is particularly suitable for an aeration tank in a wastewater treatment plant. The aeration device is also called a panel aerator.

The support body can be made particularly advantageously from a plastic material, in particular by extrusion. The support body is in particular designed as a hollow profile. The support body is constructed to save material and is lightweight. The support body is in particular lightweight and can be manufactured cost-efficiently. The support body can also be made from a metal material, in particular from steel, glass, wood or stone.

The terminal strip is particularly dimensionally stable. This means that the geometry of the terminal strip is maintained due to its own weight. The terminal strip is particularly made from a hard and solid material. The terminal strip has a hardness of at least 30 Shore D, in particular of at least 40 Shore D, in particular of at least 45 Shore D, in particular of at least 50 Shore D, in particular of at least 60 Shore D and in particular of at least 70 Shore D. In particular, the terminal strip is made from a plastic material such as polyethylene (PE), polyvinyl chloride (PVC) and/or acrylonitrile butadiene styrene (ABS). The terminal strip is particularly made in one piece. The terminal strip has in particular an open profile cross-section in a plane perpendicular to the longitudinal axis of the strip. The terminal strip is a clamping profile.

The clamping strip can be arranged reliably and stably in the outer groove of the support body and guarantees a stable and sealing arrangement of the membrane film.

In particular, an inner contour of the outer groove and an outer contour of the terminal strip are coordinated with one another in such a way that a maximum gap width results that is smaller than or equal to the wall thickness of the membrane film. In particular, the gap width is at least 80% of the wall thickness of the membrane film, in particular at least 85% of the wall thickness, in particular at least 90% of the wall thickness, in particular at least 92% of the wall thickness and in particular at least 95% of the wall thickness.

In the ventilation device, the clamping strip has at least one barb element, in particular several barb elements, which serves to engage behind the at least one retaining web. The ventilation device ensures increased security against unintentional detachment of the clamping strip from the support body. In particular, the clamping strip has two barb elements, each of which is designed to interact directly with the at least one retaining web. The barb elements are designed as slats arranged at an angle to the groove depth direction. The angle of inclination is in particular at least 10°, in particular at least 20°, in particular at least 30° and in particular at least 15°. The barb elements are designed to be flexible and enable the clamping strip to be inserted into the outer groove, in particular through the narrow section formed by the retaining webs. After passing through the narrow section, the barb elements assume their original unloaded geometry and hook onto the retaining webs, in particular by engaging behind. The barb elements form in particular an arrow-shaped contour.

There may also be more than two barb elements.

The angle of inclination of the barb elements is in particular no more than 90°, in particular no more than 85°, in particular no more than 75° and in particular no more than 60°.

In particular, the at least one barb element is formed in one piece on a connecting web of the terminal block. In particular, the at least one barb element extends from the connecting web at an angle of inclination in a rearward direction, i.e. in the direction of the opening of the outer groove. The at least one barb element engages behind the at least one retaining web. When the terminal block is removed from the outer groove, the terminal block hooks onto the retaining web in the outer groove with the at least one barb element.

A ventilation device according to claim 2 increases the safety of the clamping arrangement of the terminal strip in the outer groove. At least one retaining web forms a retaining element for the terminal strip arranged in the outer groove. The retaining web has a bearing shoulder against which the terminal strip can rest. In particular, there are exactly two retaining webs, which are arranged opposite one another on the groove flanks of the outer groove.

A ventilation device according to claim 3 simplifies the assembly of the clamping device. Because the clamping bar is designed with thin walls, it has improved structural flexibility. The assembly of the Clamping device, in particular the insertion of the terminal strip into the outer groove, in particular pressing in in the direction of the groove depth, is simplified. The wall thickness of the terminal strip is in particular small in relation to the length and/or width of the terminal strip. In particular, the ratio of wall thickness to width of the terminal strip is at most 0.25, in particular at most 0.2, in particular at most 0.15 and in particular at most 0.1.

The terminal block can be manufactured with reduced material expenditure. The terminal block is resource-saving and sustainable.

A ventilation device according to claim 4 improves the sealing arrangement of the surface element on the support body. A closing web of the clamping strip is oriented in particular transversely and in particular vertically with respect to the groove depth direction. The closing web extends in particular over the clear width of the outer groove in the area of the groove opening. With the closing web, the surface element is arranged in a sealed manner in particular in the longitudinal direction and/or in the width direction of the outer groove. It is also conceivable that a distance between the at least one barb element and the closing web in the depth direction is set in such a way that the surface element is also clamped in the groove depth direction, in particular on the outside of the holding webs facing a round opening. In particular, the surface element is clamped and sealed in the width direction of the outer groove.

A ventilation device according to claim 5 enables improved sealing. It is particularly advantageous if the membrane film is attached in a sealing manner to transverse end faces which are oriented transversely and in particular perpendicularly to the side faces. In particular, the membrane film is held and sealed by means of an end cap attached to the front. The end cap can also be glued to the film. It is conceivable that the film is also folded over at the transverse end faces of the support body. Alternatively, it is conceivable that the end cap is screwed to the support body.

A ventilation device according to claim 6 simplifies use as a ventilation device. An air connection simplifies the direct supply of gas, in particular air, to the ventilation device and is in particular attached directly to the support body, in particular by cold welding. The attachment is robust and durable. If the attachment is made on an upper side of the support body, the assembly of the ventilation device and in particular a connection to the ventilation lines is simplified. It is advantageous if the air connection has a backflow prevention function in the form of a check valve. This reliably prevents liquid, in particular waste water, from inadvertently entering an air supply line. The backflow prevention function can be carried out particularly advantageously and simply by means of a film valve, which is arranged in particular on the air connection. The film element is in particular designed in the shape of an annular disk and in particular arranged on the air connection in such a way that an intended gas flow, in particular air flow, from the air connection into the interior of the ventilation device is possible, but an opposite flow from the interior to the air connection is prevented. Additionally or alternatively, an air connection can also be provided on the front side of the support body.

An aeration device according to claim 7 improves a stable arrangement of the aeration device in a basin filled with water.

At least one hollow chamber, particularly on a transverse face of the support body, which is open to the outside allows water to enter the support body. This reduces and in particular prevents any buoyancy force acting on the support body.

In a ventilation device according to claim 8, the fastening to a base is improved, in particular made easier. Pre-assembly of a fastening tab, for example on a concrete foundation on the tank floor of a sewage treatment plant, is simplified. The support body of the ventilation device can be easily attached to the already anchored fastening tab. The assembly and disassembly of the ventilation device as a whole is thus simplified. Downtimes for repair and/or maintenance work are reduced. In particular, the ventilation device with the support body can be snapped and/or clipped onto the fastening tab anchored to the base. In such a design, the fastening tab is made of a flexible and/or elastic material, in particular of a plastic material.

Alternatively, the fastening tab can be attached to the base subsequently and in particular individually adapted to the position of the ventilation device. This improves the flexibility in positioning the ventilation device. In this case, the fastening tab is made in particular from a metallic material, in particular from steel material and in particular from V2A or V4A. The fastening tab is made in particular from a sheet metal strip and can comprise one-piece molded functional elements, which are produced in particular by bending and/or edging.

A ventilation device according to claim 9 enables improved protection of the membrane film on the support body. The end face collar is arranged outside the outer groove and enables the membrane film to be clamped to the side face of the support body at the front. The membrane film is reliably protected from damage by lateral flows, which are oriented in particular transversely and in particular perpendicularly to the side face of the support body and in particular parallel to the depth direction of the outer groove, in particular in an edge region of the support body. The end face collar extends in particular parallel to the side face of the support body and in particular along the entire height of the side face. The end face collar forms a protective web. The end face collar is attached to the terminal block and in particular is designed as a single piece with it. It is also conceivable that the protective web is subsequently attached to the terminal block, in particular by gluing, welding and/or screwing.

The end face collar has the additional advantage that the membrane film is already protected during the manufacture of the ventilation device, i.e. when the terminal block is pressed into the outer groove, in particular against damage by a pressing tool.

Both the features specified in the patent claims and the features specified in the following embodiments of a ventilation device according to the invention are each suitable, either alone or in combination with one another, for further developing the subject matter of the invention. The respective combinations of features do not represent any restriction with regard to the further developments of the subject matter of the invention, but essentially only have an exemplary character.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Belüftungsvorrichtung,

Fig. 2

eine Explosionsdarstellung der Belüftungsvorrichtung gemäß Fig. 1,

Fig. 3

eine Schnittdarstellung gemäß Schnittlinie III-III in Fig. 1 ohne Darstellung einer Folie,

Fig. 4

eine Schnittdarstellung gemäß Schnittlinie IV-IV in Fig. 1,

Fig. 5

eine vergrößerte Detailansicht des Details V in Fig. 4,

Fig. 6

eine Fig. 3 entsprechende Schnittdarstellung einer Belüftungsvorrichtung gemäß einem weiteren Ausführungsbeispiel,

Fig. 7

eine perspektivische Explosionsdarstellung der Befestigungslaschen für die Belüftungsvorrichtung in Fig. 6,

Fig. 8, 9

schematische Schnittansichten zur Darstellung einer Endkappenbefestigung an einem Tragkörper gemäß Fig. 6,

Fig. 10, 11

Fig. 6, 7 entsprechende Darstellungen mit alternativ ausgeführten Befestigungslaschen, und

Fig. 12, 13

Fig. 6, 7 entsprechende Darstellungen mit einer einteiligen Befestigungslasche.

Further features, advantages and details of the invention emerge from the following description of embodiments based on the drawing. They show:

Fig.1

a perspective view of a ventilation device according to the invention,

Fig.2

an exploded view of the ventilation device according to Fig.1 ,

Fig.3

a sectional view according to section line III-III in Fig.1 without displaying a slide,

Fig.4

a sectional view according to section line IV-IV in Fig.1 ,

Fig.5

an enlarged detailed view of detail V in Fig.4 ,

Fig.6

one Fig.3 corresponding sectional view of a ventilation device according to a further embodiment,

Fig.7

a perspective exploded view of the fastening tabs for the ventilation device in Fig.6 ,

Figs. 8, 9

schematic sectional views showing an end cap attachment to a support body according to Fig.6 ,

Fig. 10, 11

Fig.6 , 7 corresponding representations with alternative fastening tabs, and

Fig. 12, 13

Fig.6 , 7 corresponding representations with a one-piece fastening tab.

One in Fig. 1 to 5 The ventilation device, which is marked with 1 overall, comprises a support body 3 having a longitudinal axis 2, a flexible surface element in the form of a membrane film 4 and a clamping strip 5 with which the surface element 4 is clamped to the support body 3. The longitudinal axis 2 is oriented perpendicular to the plane of the drawing.

The support body 3 is designed as a plate, in particular made of a plastic material. The support body 3 has a cross-sectional area oriented perpendicular to the longitudinal axis 2, which is essentially rectangular. The support body has an upper side 6 and an oppositely arranged lower side 7, in particular oriented parallel to the upper side 6. The upper side 6 and the lower side 7 are connected to one another by side surfaces 8. The upper side 6, the lower side 7 and the side surfaces 8 each extend along the longitudinal axis 2.

The support body 3 has a length L which is oriented along the longitudinal axis 2. The support body 3 has a width B which is oriented perpendicular to the longitudinal axis 2 and parallel to the top side 6 and/or bottom side 7. The support body 3 has a height H which in particular defines the vertical distance between the top side 6 and the bottom side 7.

The height direction is oriented perpendicular to the length direction and the width direction. In particular, the height H is smaller than the width B and smaller than the length L.

An outer groove 9 is arranged on each of the side surfaces 8 of the support body 3. The outer groove 9 is open towards the respective side surface 8 and extends along the width direction into the support body 3. The outer groove 9 also extends in particular along the longitudinal direction, i.e. parallel to the longitudinal axis 2, in particular over the entire length L of the support body 3. The outer groove 9 is in particular continuous in the longitudinal direction. The outer groove 9 has two oppositely arranged groove flanks 10 which define a groove width b _N. The groove width b _N is defined by the vertical distance between the opposite groove flanks 10. The outer groove 9 also has a groove base 11. A vertical distance from the groove base 11 to the side surface 8 defines a groove depth t _N .

The outer groove 9 has a groove center axis 13. The inner contour of the outer groove 9 is mirror-symmetrical with respect to the groove center axis 13. The groove center axis 13 extends along the depth direction of the outer groove 9.

The outer groove 9 has a projecting retaining web 12 on each of the groove flanks 10. The retaining webs 12 have a rectangular contour and project into the outer groove 9. The retaining webs 12 are arranged set back from the side surface 8 in the outer groove 9. The retaining webs 12 are in particular designed to be identical.

The retaining webs 12 are arranged opposite one another and mirror-symmetrically to one another with respect to the groove center axis 13. The outer groove 9 has a reduced groove width b _red in the area of the retaining webs 12.

The clamping strip 5 is arranged, in particular completely, within the outer groove 9. In particular, the clamping strip 5 is arranged flush with the surface with respect to the side surface 8 in the outer groove 9. The clamping strip 5 is designed as a clamping profile and has a strip longitudinal axis 14 oriented perpendicular to the image plane. The strip longitudinal axis 14 is oriented in particular parallel to the longitudinal axis 2. The clamping strip 5 has an open profile geometry in the plane perpendicular to the strip longitudinal axis 14. The profile geometry is thin-walled with a wall thickness w that is particularly small in relation to the length of the clamping strip 5 along the strip longitudinal axis 14. The length of the clamping strip 5 is essentially identical and in particular identical to the length L of the support body 3.

The terminal block 5 is designed in one piece. Due to the thin-walled design, the terminal block 5 has structural flexibility.

The clamping strip 5 has an external end web 15 with which the film 4 is held in a clamped manner in the vertical direction of the support body 3 on the groove flanks 10 of the outer groove 9 and in particular along the length of the clamping strip 5. In particular, the width of the end web 15 in the groove width direction is selected such that a resulting gap between the clamping strip 5 and the outer groove 9 is smaller than the film thickness d.

The terminal block 5 has a connecting web 16 which extends vertically from the end web 15 and the assembled arrangement the clamping strip 5 is oriented in particular parallel and concentric to the groove center axis 13. The connecting web 16 connects the end web 15 to two barb elements 17 which are formed on the connecting web 16 at an inclination angle n. The barb elements 17 extend in a rearward direction, essentially oriented towards the side surface 8. The barb elements 17 define a retaining width b _RH , which is in particular greater than the reduced groove width b _red in the region of the holding webs 12. In particular, the retaining width b _RH is smaller than the groove width b _N . In particular, the retaining width b _RH is designed such that the gap between the clamping strip 5 in the region of the barb elements 17, in particular in the width direction of the clamping strip 5, is smaller than the film thickness d.

Due to the structural flexibility of the terminal strip 5 and in particular of the barb elements 17, the terminal strip 5 can be inserted into the outer groove 9 in such a way that the barb elements 17 are temporarily pressed towards the connecting web 16 when passed through the opposing retaining webs 12, in particular due to the structural flexibility. If the terminal strip 5 is inserted so deeply into the outer groove 9 that the barb elements 17 are guided past the retaining webs 12 and are exposed, they can be moved back to their starting position, in particular due to their elasticity. The barb elements 17 prevent the terminal strip 5 from being accidentally pulled out of the outer groove 9, in particular because the barb elements 17 rest against a rear bearing shoulder 18 of the respective retaining web 12.

According to the embodiment shown, the film 4 is clamped at least in the area of the outer groove flanks 10 by the closing web 15 in the width direction of the outer groove 9 and by the barb elements 17 on inner sections of the groove flanks 10, in particular behind the holding webs 12, in the width direction of the outer groove 9.

It is possible to adjust the length of the connecting web 16 along the groove center axis 13 in such a way that the barb elements 17 in the assembled state permanently rest against the contact shoulders 18. In addition, or alternatively, it is possible to adjust the length of the connecting web 16 in such a way that the clamping strip 5 with the end web 15 presses the film 4 directly onto the holding webs 12.

In particular, it is also conceivable to design the length of the connecting web 16 in such a way that the terminal block 5 is compressed in the direction of the groove depth in the assembled state and in particular the film 4 is pressed by the terminal block 5 against the groove base 11.

The film 4 is made in particular from an elastic and deformable material, in particular from a plastic material, in particular from TPU or a silicone material.

The film 4 is held reliably and tightly in the outer groove 9 by means of the clamping strip 5.

The ventilation device 1 is also called a panel ventilator.

The support body 3 is designed like a plate and has an outer groove 9 on each of the oppositely arranged side surfaces 8. As a result, it is possible to attach the film 4 to both sides of the support body 3 by means of the clamping strips 5. The membrane film enables the targeted release of gas, in particular air, from an interior space 28 enclosed by the support body 3 and the membrane film 4 attached to it in a sealed manner.

An air connection 19, which is in particular fastened to the support body 3 and in particular cold-welded thereto, serves to supply air into the interior. For this purpose, the support body 3 has a corresponding recess 20 on its upper side 6, into which the air connection 19 can be inserted.

The air connection 19 is designed in several parts with a cylinder cap-shaped receptacle 21, which is cold-welded directly to the support body 3. A mounting base 22 is placed on the receptacle 21 and is held in a rotationally fixed manner on the receptacle 21 and is welded thereto. In particular, the mounting base 22 and the receptacle 21 form a one-piece component. The mounting base 22 has a threaded connector 23 which is integrally formed on a support disk 24. The membrane film 4 is held between the support disk 24 and a clamping disk 25 placed on the threaded base 23 and is clamped in place by means of a retaining nut 26 screwed onto the threaded base 23.

The support disk 24 has in particular at least one and in particular several through slots 27 in order to enable a gas flow, in particular an air flow, from the air connection 19 into the interior 28, which is delimited by the support body 3, in particular its upper side 6 and by the membrane film 4. Through the membrane film 4 the air from the interior 28 can be released to the outside environment. This is indicated by the dashed arrows 43 in Fig.4 An air supply and the resulting air flow are indicated by flow arrows 29 in Fig.4 symbolized. The air supply takes place via a, in particular bent, pipe socket 30 and a transition screw connection 31 attached to it. It is understood that the air supply 29 into the air connection 19 can also take place in another way, in particular through corresponding lines and/or hoses.

In order to avoid a counterflow opposite to the air flow 29, i.e. from the interior 28 to the pipe socket 30, the air connection 19 has a check valve 45, which is designed as a ring-shaped film, in particular made of a plastic material, in particular of thermoplastic polyurethane (TPU) and/or of a silicone material. The check valve 45 is in particular designed to be soft-elastic and in particular rubber-like. The check valve 45 is in particular designed to be thin-walled, in particular with a film thickness of 0.3 mm to 1.0 mm, in particular of 0.4 mm to 0.8 mm and in particular of 0.6 mm to 0.65 mm. The check valve 45 is in particular a plastic film. The check valve 45 is in particular made of the same material as the membrane film 4.

The non-return valve 45 is clamped in particular between the support disk 24 and the membrane foil 4 on the threaded base 23. In the Fig.4 shown air flow 29, the non-return flap 45 can pivot upwards in a radially outer area, away from the through slot 27. In order to improve the pivotability of the non-return flap 45, it can be provided to have an integrated pivot joint on the check valve 45, for example by an impression and/or material recess, which is designed in particular in the circumferential direction, in particular all around, and/or on an upper side of the check valve.

According to the embodiment shown, the support body 3 is essentially designed as a hollow profile and in particular has at least one and in particular several hollow chambers 36. The support body 3 is in particular a lightweight profile. In a plane perpendicular to the longitudinal axis 2, the support body 3 has a framework-like structure in which the hollow chambers 36 are in particular connected by framework-like struts that extend along the cavity direction, along the width direction and/or transversely thereto. The struts are advantageously designed to be straight.

The support body 3 is in particular one-piece and in particular made from a plastic material, in particular by plastic extrusion. Retaining grooves 32 are formed on the underside 7 of the support body 3. The retaining grooves 32 are in particular arranged opposite one another on the support body 3 and face one another. In particular, the retaining grooves 32 are facing away from the adjacent side surface 8 with their opening. The respective opening of the receiving groove 32 is oriented opposite to the opening of the respective corresponding outer groove 9. The respective opening of the receiving groove 32 is directed inwards on the support body 3. The retaining grooves 32 are each limited downwards, i.e. the underside 7 of the support body 3, by a support foot 48. The support foot 48 protrudes inwards on the support body 3 like a tab. The two support feet 48 are arranged opposite one another and face one another.

The retaining grooves 32 serve to accommodate fastening tabs 33. The fastening tabs 33 are arranged in particular in a clamping manner in the retaining grooves 32. The fastening tabs 33 have in particular through holes 46 in order to anchor the fastening tabs 33 to a substrate, in particular to the bottom of an aeration tank. The fastening tabs 33 can be fastened directly to the substrate or to a support element provided for this purpose. The through holes 46 are in particular designed in the form of an elongated hole. The elongated hole has a longitudinal extension that is oriented along the width direction of the aeration device 1. This simplifies lateral fine adjustment when fastening the aeration device 1. In particular, manufacturing tolerances of the fastening tabs 33 and/or the support body 3 as well as assembly tolerances when fastening the anchoring holes in the substrate can be easily compensated. The fastening tabs 33 are in particular made of a rust-proof material, in particular of stainless steel, in particular V4A steel. The fastening tabs 33 can also be made of a plastic material. It is advantageous if the material used to manufacture the fastening tabs 33 is non-rusting and acid-resistant.

The fastening tabs 33 are in particular attached to the retaining grooves 32 in pairs, opposite one another with respect to the longitudinal axis 2. Three fastening tabs 33 are arranged in each retaining groove 32 along the longitudinal axis 2. The ventilation device 1 is held flexibly and reliably to the substrate by means of the fastening tabs 33.

In order to seal the interior 28, in particular also on a transverse end face 44 on the support body 3, an end cap 34 is placed on the front side of the support body 3 and is provided with at least one and in particular each several fastening screws 35 on the support body 3. The transverse end face 44 is oriented in particular perpendicular to the longitudinal axis 2. The fastening screws 35 can be made of steel, in particular V4A, and/or of a plastic material, in particular polyetheretherketone (PEEK). The fastening screws 35 extend in particular in the vertical direction of the support body 3. In particular, the end cap 34 can be glued to the support body 3 in addition to the screw connection.

As is particularly evident from Fig.1 and 2 The end cap 34 can have large-area and/or slot-shaped access openings that enable a fluid connection with the hollow chambers 36 of the support body 3. This allows liquid, in particular water, to penetrate into the hollow chambers 36 in an aeration tank of a wastewater treatment plant. A buoyancy force on the support body 3 and on the aeration device 1 as a whole is reduced and in particular avoided.

In the following, with reference to Fig. 6 to 9 a second embodiment is described. Structurally identical parts are given the same reference numerals as in the previous embodiment, to the description of which reference is hereby made. Structurally different but functionally similar parts are given the same reference numerals with an a after them.

The support body 3a differs from the previous embodiment in that the hollow chambers 36 are each rectangular and are regularly arranged in the support body 3a.

The end web 15 has a front face collar 37 that projects radially with respect to the strip axis 14. The front face collar 37 is arranged outside the outer groove 9 and serves for the front-side clamping of the Fig.6 not shown film 4 on the side surface 8. The holding force exerted on the film 4 is thereby additionally increased.

According to this embodiment, the terminal block 5a is not arranged completely within the outer groove 9, but protrudes at least partially, in particular with the end face collar 37, on the side surface 8.

The support body 3a has an additional retaining groove 47 on each of the side surfaces 8, which is arranged in particular below the outer groove 9. The further retaining groove 47 is formed in particular by the support foot 48 protruding on the side surface 8 and thus delimiting the further retaining groove 47 at the bottom.

The fastening tab 33 is designed as a flat sheet metal strip in which a slot-shaped through-hole 46 is arranged. At one end facing the further holding groove 47, the fastening tab 33 is bent essentially in an S-shape. The fastening tab 33 has an engagement section 49 which is arranged in the further holding groove 47 to hold the support body 3a. The engagement section 49 is a functional element formed in one piece on the fastening tab 33.

It is advantageous if the S-shaped bend of the engagement section 49 is designed in such a way that its height difference is smaller than the height of the support foot 48. This improves the vertical fixation of the support body 3a to the ground. In particular, a play-free fastening of the Ventilation device 1a is ensured. Undesirable movements that could lead to damage to the support body 3a are avoided.

In order to improve the fastening of the ventilation device 1a to the substrate and in particular to facilitate assembly, a fastening strip 50 can also be used as a support element. The fastening strip 50 is designed in particular as a one-piece sheet metal section. The fastening strip 50 is flat and has slot-like through-holes 46 that correspond to the through-holes 46 of the fastening tabs 33. The fastening strip 50 is optional.

A further difference from the previous embodiments is the design of the end cap 34a. The end cap 34a is snapped onto the front side of the support body 3a and glued to the support body 3a, in particular to its upper side 6.

The end cap 34a has a front surface end web 38 which, in the assembled state of the end cap 34a, as shown in Fig.9 shown, is oriented parallel to the transverse end face 44. An upper fastening web 39 and a lower folding web 40 are integrally formed on the end face end web 38.

The fastening web 39 has a comb profile 41 on its contact surface facing the top side 6 of the support body 3a, which improves the holding force for fastening to the support body 3a. To attach the end cap 34a, it is placed with the fastening web 39 on the top side 6 of the support body 3a and with the folding web 40 in the transition area of the front side of the support body 3a and the underside 7 of the support body 3a. To mount the end cap 34a, it is snapped onto the support body 3a in such a way that the end cap 34a is wrapped around the support edge A of the fastening web 39 on the top side 6 according to Fig.7 is opened clockwise along the folding curve 42. The folding curve 42 is defined by a folding radius R _K around the support edge A. It is advantageous that the lower folding web 40 is designed to be convex in such a way that the folding radius R _K intersects the contour of the folding web 40 at two points. The first intersection point is the contact point K with which the folding web 40 rests on the support body 3a. The second intersection point is the holding point H with which the folding web 40 rests on the underside 7 when the end cap 34a is mounted. Because the folding web 40 has the convex contour, an unintentional release of the end cap 40 from the mounted arrangement according to Fig.9 out is unlikely. Between the contact point K and the holding point H, the circular line runs around the support edge A with the folding radius R _K within the lower folding web 40. A free distance between the support edge A and the outer surface of the folding web 40 is therefore always smaller than the folding radius R _K , so that the end cap 34a in the snapped-on state according to Fig.9 is held firmly and in particular self-locking to the support body 3a. The fastening is reliable and robust. In order to improve the sealing of the film 4, the fastening web 39, in particular in the area of the comb profile 41, can be coated with an adhesive, in particular a liquid film.

The following is based on Fig.10 and 11 an alternative design of a floor fastening for the ventilation device 1a is explained in more detail. In the fastening tabs 51, the respective engagement section 52 is bent in a U-shape and serves to grip behind the support foot 48.

A clamping tab 53 is used to fix the fastening tab 51 to the support body 3a, which is in particular formed in one piece on the fastening tab 51. The clamping tab 53 is in particular formed by a punching out of the sheet metal blank of the fastening tab 51 and is bent upwards as a 90° arc section, in particular in the direction in which the engagement section 52 is also bent. The clamping tab 53 extends only over a partial section in the width direction of the fastening tab 51. The punching out and the bending of the clamping tab 53 form a window-like through-opening in the fastening tab 51, which extends in particular over the entire sheet thickness.

Between the clamping section 52 and the engagement section 52, a clamping width B _K is defined which essentially corresponds to the foot width B _F of the support foot 48. In particular, the following applies: B _K ≤ B _F , in particular B _K ≥ 0.95 . B _F , in particular B _K ≥ 0.98 · B _F and in particular B _K ≤ 0.9995 · B _F .

The fastening tab 51 can be hooked onto the support foot 48 with the engagement section 52 and pivoted onto the support body 3a in such a way that the clamping tab 53 rests against the side surface 8, in particular against the external rear wall 54 of the support foot 48. Because the clamping width B _K is smaller than the width B _F of the support foot 48, the fastening tab 51 is reliably fixed to the support body 3a. The retaining tabs 51 can be easily pre-mounted on the support body 3a and then attached to the fastening strips 50. This simplifies assembly.

The following is based on Fig. 12 and 13 a further design of a floor fastening is explained.

In contrast to the previous embodiments, the opposing fastening tabs 55 are designed as one piece in a fastening unit 56. The fastening unit 56 is designed as one piece from a sheet metal strip, which is bent in particular in such a way that engagement sections 52 are formed in accordance with the previous embodiment. Because the fastening unit 56 is designed as a bent and/or folded sheet metal strip, the strength and rigidity are increased. The manufacturing effort for the fastening unit 56 is reduced.

A connecting section 57 is formed on the engagement sections 52. The fastening unit 56 is mounted on the support body 3a in particular such that the fastening unit is arranged below the underside 7 of the support body 3a, but rotated about a vertical axis such that the connecting section 57 extends transversely and in particular not parallel to the width direction of the support body 3a. By rotating the fastening unit 56 about the vertical axis, the connecting section 57 is rotated into an arrangement parallel to the width direction of the support body 3a. As a result of the rotation, the engagement sections 52 engage behind the internal retaining grooves 32 and simplify the mounting of the support body 3a on the base.

Claims (9)

Ventilation device comprising a support body (3; 3a) with two external grooves (9), each formed on a side surface (8) of the support body (3; 3a), b. a membrane film (4) attached to the support body (3; 3a), c. a clamping strip (5; 5a) with which the membrane film (4) is clamped to the support body (3; 3a) by the clamping strip (5; 5a) engaging in the outer groove (9), characterized in that the clamping strip (5; 5a) has at least one barb element (17) for engaging behind the at least one retaining web (12). Ventilation device according to one of the preceding claims, characterized by at least one holding web (12) projecting into the outer groove (9) for holding the clamping strip (5; 5a) in the outer groove (9). Ventilation device according to one of the preceding claims, characterized in that the clamping strip (5; 5a) is designed with thin walls. Ventilation device according to one of the preceding claims, characterized in that the clamping strip (5; 5a) has a closing web (15) with which the clamping strip (5; 5a) seals off the outer groove (9) in the assembled state. Ventilation device according to one of the preceding claims, characterized in that the membrane film (4) is attached to the front side is attached to the supporting body (3; 3a), in particular by means of an end cap (34; 34a). Ventilation device according to one of the preceding claims, characterized by an air connection (19) fastened to the support body (3; 3a), which is arranged in particular on an upper side (6) of the support body (3; 3a) facing the membrane film (4). Ventilation device according to one of the preceding claims, characterized by at least one outwardly open hollow chamber (36) of the supporting body (3; 3a). Ventilation device according to one of the preceding claims, characterized in that at least one fastening tab (33; 51; 55), in particular detachable, is attached to the support body (3; 3a), with which the ventilation device (1; 1a) can be fastened to a base. Ventilation device according to one of the preceding claims, characterized in that the clamping strip (5a) has an end face collar (37) for covering the membrane film (4) on the side surface (8) of the supporting body (3a).

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