Air duct and assembly for a fume hood

Abstract

The invention relates to an air duct (301) which extends essentially in a longitudinal direction (X), having a duct wall (302) which encloses a flow cross section, and having at least one fastening means (303) on its inner side for fastening at least one functional element (304) which can be accommodated in the air duct (301) in a variable position in the longitudinal direction (X) of the duct.

Description

Technical Field

[0001] The present invention relates to an air duct and assembly for a fume hood, wherein the air duct extends substantially in the longitudinal direction and has a duct wall surrounding a flow cross section. Background Technology

[0002] Various air ducts exist in the prior art for building ventilation and exhaust. For example, the function of air ducts is to remove steam generated during kitchen work, especially steam generated when heating food and liquids, from the kitchen area to keep the work area free of odors and condensation.

[0003] In the context of increasing environmental awareness and competitive pressure in a globalized economy, the goal of resource-saving manufacturing of air ducts is twofold: firstly, to reduce the amount of materials used, and secondly, to design air ducts for the widest possible range of applications. For example, air ducts are known from DE10 2017 104 772A1.

[0004] However, a drawback of existing air ducts is that separate fastening methods must be provided for different situations where additional functional components are accommodated within the air duct. Furthermore, depending on the length of the duct components, additional central supports may be required, but this can vary depending on the installation conditions. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide an air duct that can accommodate different functional components in a particularly simple manner.

[0006] This objective is achieved by an air duct and a component having the following characteristics.

[0007] Therefore, an air duct is proposed that extends substantially in the longitudinal direction, wherein the duct wall surrounds the flow cross section and has fastening means on its inner side for positioning and variablely fastening at least one functional element that can be accommodated in the air duct in the longitudinal direction of the duct. The air duct can be specifically designed as a flat duct.

[0008] The transverse dimension of a flat duct can be greater than its height dimension. Therefore, the duct wall surrounding the flat duct can have a total of four wall sections, wherein the wall sections extending laterally are parallel to each other, and the wall sections extending vertically are also parallel to each other. The individual wall sections can be joined together by fillets. Alternatively, the air duct can be designed as a circular duct. The inner side of the duct wall faces the flow cross-section in particular. Functional elements can be elements that technically interact with the air duct. These functional elements can also be elements that extend the technical function of the air duct. For example, a support web, cable conduit, or sound damping element, or a combination thereof, can be acceptable functional elements. The air duct may also include two opposing fastening means. This allows the functional elements housed in the duct to be secured to the opposing inner sides of the duct. In particular, the opposing fastening means can be arranged aligned with each other.

[0009] The pipe wall can be configured to have a wall thickness that varies along its path. For example, in a flat pipe, the wall thickness of the rounded corners can be less than the wall thickness of the straight wall sections. It can also be configured such that, in each case, the wall thickness of the straight wall sections gradually increases towards the center. In a flat pipe design, it can be further configured such that the maximum thickness of the wall sections extending in the transverse direction is greater than the maximum thickness of the wall sections extending in the vertical direction. For example, the wall thickness of the rounded corners can be between 0.8 mm and 1.6 mm, preferably between 1.0 mm and 1.4 mm, and particularly preferably 1.2 mm. The maximum wall thickness of the wall sections extending in the height direction is, for example, between 1.0 mm and 1.5 mm, preferably between 1.2 mm and 1.3 mm, and particularly preferably 1.25 mm. The maximum wall thickness of the wall sections extending in the transverse direction can be, for example, between 1.5 mm and 2.1 mm, preferably between 1.7 mm and 1.9 mm, and particularly preferably 1.8 mm. Starting from the point of maximum wall thickness at the center of the wall section extending laterally, the corresponding wall section on the outer side of the flat pipe can extend in a angular direction with an inclination between 0.2° and 0.6°, preferably between 0.3° and 0.5°, and particularly preferably 0.4°. The height extension of the flat pipe can be, for example, 80mm-92mm, preferably 84mm-88mm, and particularly preferably 86.6mm. The lateral range of the flat pipe can be, for example, 200mm-240mm, preferably 210mm-230mm, and particularly preferably 219.6mm. The inner radius of the fillet can be, for example, 15mm-25mm, preferably 18mm-22mm, and particularly preferably 20mm.

[0010] Air ducts can also have ribbed structures on their inner sides. This is particularly advantageous because it reduces frictional resistance on surfaces affected by turbulent overflow. The ribs can be designed as thin ribs with pointed ends. The longitudinal axes of the ribs or spars can be aligned in the flow direction.

[0011] Alternatively, the air duct may have longitudinally extending reinforcing ribs on its outer side. The distance between the reinforcing ribs may be smaller in the rounded corner areas than in the straight wall sections. The distance between the reinforcing ribs may gradually increase towards the center of the straight wall section. For example, the maximum spacing of the reinforcing ribs on the laterally aligned wall sections of a flat duct may be between 5 mm and 15 mm, preferably between 8 mm and 12 mm, and particularly preferably 10 mm. Furthermore, the maximum spacing of the reinforcing ribs on the height-aligned wall sections of a flat duct may be between 3 mm and 7 mm, preferably between 4 mm and 6 mm, and particularly preferably 5 mm.

[0012] In the design of a flat pipe with a basically rectangular flow cross-section, the fastening means are preferably arranged on the inside of one of the longer wall sections, particularly on the inside of the transverse wall. When the supporting web is fastened using fastening means, the flat pipe can be particularly advantageously supported at its weakest point, where the supporting web is supported on the opposite wall.

[0013] The fastening means can be designed to prevent the functional element from moving in a direction within the pipe from the pipe wall section including the fastening means. This prevents slippage or displacement of the functional element along the height axis of the air pipe, particularly in the direction of the pipe center or opposite wall. For this purpose, the fastening means can have a retaining device that can be clamped from behind by the functional element inserted into the air pipe.

[0014] The fastening means can also be designed to prevent the functional element from moving laterally in the pipe wall section including the fastening means. This prevents the functional element from slipping or displacing along the lateral axis of the air duct, particularly along the pipe wall section including the fastening means. For this purpose, the fastening means can have retaining devices that laterally support the functional element inserted into the air duct. In particular, the fastening means can have retaining devices that laterally secure the functional element inserted into the air duct from both sides.

[0015] Furthermore, the fastening means can be designed to prevent the functional element from twisting about an axis of rotation perpendicular to the plane of the pipe wall section including the fastening means. Therefore, twisting of the functional element within or parallel to the plane of the pipe wall section including the fastening means can be prevented. For this purpose, the fastening means can have retaining devices that support the functional element inserted into the air duct from both sides in the lateral direction, with the support points offset from each other in the longitudinal direction of the duct.

[0016] Furthermore, the fastening means can be designed to prevent the functional element from twisting about a rotation axis perpendicular to the flow cross-section. This prevents twisting of the functional element parallel to the pipe wall. For this purpose, the fastening means can have a retaining device that can be clamped from behind by the functional element inserted into the air duct at at least two support points spaced apart from each other in the lateral direction.

[0017] The fastening means can be designed to prevent the functional element from twisting about a rotation axis perpendicular to the longitudinal section of the pipe. This also prevents the functional element from twisting about a transverse axis. For this purpose, the fastening means can have a retaining device that can be clamped from behind by the functional element inserted into the air pipe at at least two support points spaced apart from each other in the longitudinal direction.

[0018] Furthermore, the fastening means may have at least one linear track extending at least partially in the longitudinal direction of the pipe. Specifically, the linear track may be centrally arranged on the pipe wall including it. The linear track may extend along the entire length of the pipe.

[0019] Furthermore, the fastening means can have at least two undercut locking sections, so that the functional element can be pushed onto the fastening means in the longitudinal direction of the pipe. For example, at least one linear track can have a longitudinal groove, wherein the two locking sections are designed to face each other in an undercut manner. Alternatively, at least one linear track can have two locking sections on its outer side that are opposite to each other in the transverse direction.

[0020] The fastening means may include two parallel linear rails, each with an undercut locking section. To simplify the passage of functional elements, the two linear rails may be widened at the ends of the pipe fittings in the longitudinal direction, or may be slightly spaced apart. Correspondingly, the locking sections may also be widened at the widened ends.

[0021] At least one linear track may have a first segment extending substantially perpendicular to the pipe wall and a second segment extending substantially parallel to the pipe wall.

[0022] Undercut locking segments can point to each other. Alternatively, undercut locking segments can point away from each other.

[0023] This fastening method can be integrally formed with or molded onto the pipe wall. For example, the pipe can be produced by extrusion.

[0024] It can be envisioned that the air duct is designed as a flat duct with different wall thicknesses, wherein the wall thickness in the corner region is less than the wall thickness in the straight wall section, and the wall thickness increases toward the center of the straight wall section.

[0025] The present invention also relates to a component comprising an air duct having the technical features described above and a functional element installed in the air duct.

[0026] The functional element may have two snap-fit ​​legs that engage behind the undercut locking section to secure the functional element in the air duct. To install the functional element, it can be pushed onto the fastening means that opens towards the end face via one of the end faces of the air duct. The snap-fit ​​legs can be interconnected via two locking or snap-fit ​​legs connected together. When the snap-fit ​​legs are installed in the locking section, they can be slightly pre-tightened. This ensures the secure fastening of the functional element in the air duct.

[0027] Alternatively, the functional element can be configured to include an air duct support member extending between a fastener and a duct wall section opposite the fastener. The support element can be configured to slightly bias the opposing support duct walls toward each other. If the air duct has two opposing fastening means, the support element can be inserted into the respective fastening means using opposing snap-fit ​​legs. If only one fastening means is provided in a flat duct, the support element can be designed to have a force-introducing surface on the side opposite the fastening means. The force-introducing surface can be specifically designed to be parallel to the adjacent duct wall, such that the force-introducing surface rests flat against the associated flat duct wall. Providing a force-introducing surface results in improved support or anti-tilting protection of the support element, thus the support element is supported according to a third Euler buckling shell, resulting in a higher critical buckling load. Furthermore, the support element can be formed as a support web having a web portion extending substantially parallel to the height range of the duct. The web portion can have a thickening towards the center of the web. This is where the highest stress may occur. The thickness of the web center can be 1.9mm-2.1mm, preferably 1.95mm-2.05mm, and particularly preferably 1.99mm.

[0028] Furthermore, the functional element may have a cover extending between the undercut locking sections, thereby forming a cable conduit between the cover and the pipe wall section it covers, the cable conduit being separate from the flow area and extending longitudinally in the pipe direction. The cable conduit is designed, for example, to simultaneously accommodate, for example, an 8mm diameter compressed air hose and a 4x6mm cable. The cover may extend between and / or be formed onto the two snap-fit ​​legs. In particular, the cover may be semi-circular in shape. Furthermore, the cover and the support web may be designed as a combination. In this case, the support web above the cover may extend away from the cover. The support web may be integrally formed with the cover. The semi-circular design of the cover combined with the support element provides particularly good stress distribution. Directly above the cover, the thickness of the web may be between 1.2mm and 1.4mm, preferably 1.25mm to 1.35mm, and particularly preferably 1.28mm. Directly below the force-introducing surface, the thickness of the web can be between 1.15mm and 1.35mm, preferably 1.2mm to 1.3mm, and particularly preferably 1.23mm.

[0029] The surfaces of functional elements allocated to the flow area of ​​the air duct can all be covered with a rib structure. Attached Figure Description

[0030] Further features, advantages, and characteristics of the present invention can be seen in the following description of preferred embodiments of the invention, with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is a perspective view of an embodiment of a flat pipe according to the present invention;

[0032] Figure 2 This is a perspective view of an embodiment of a circular pipe according to the present invention;

[0033] Figure 3a This is a cross-sectional view of an embodiment of a flat pipe with fastening means according to the present invention;

[0034] Figure 3b This is a cross-sectional view of an embodiment of a flat pipe having two opposing fastening means according to the present invention;

[0035] Figure 4a This is a perspective view of the cable conduit assembly with a supporting web according to the present invention;

[0036] Figure 4b This is a cross-sectional view of the cable conduit assembly with supporting web according to the present invention;

[0037] Figure 5a It is a 3D diagram of cable conduits;

[0038] Figure 5b This is a cross-sectional view of the cable conduit;

[0039] Figure 6 It is a cross-sectional view of a functional element inserted into a flat pipe. Detailed Implementation

[0040] Figure 1 A first embodiment of an air duct 301 in the form of a flat duct 316 is shown. The flat duct 316 extends substantially in the longitudinal direction X, the transverse direction Y, and the vertical direction Z corresponding to the flow direction, with the horizontal wall segments aligned in the transverse direction Y being longer than the vertical wall segments aligned in the vertical direction Z. The four wall segments shown together form a duct wall 302 surrounding a flow cross-section in the YZ plane, with rounded corner areas of adjacent duct wall segments. At the center of the lower horizontal duct wall inside the duct 306, a fixing device 303 is arranged in a duct wall segment 305 having two parallel linear tracks 307, each having a locking section 308 pointing towards each other, the locking section 308 having an undercut design relative to the duct interior 306. The parallel linear tracks 307 therefore extend in the longitudinal direction X of the flat duct 316. As can be seen, rib structures 315, called ribs, are arranged on the pipe wall 302 inside the pipe 306, covering the wall. The ribs extend in the longitudinal direction X of the flat pipe 316. The thin ribs 315 impede the lateral movement of eddies in the turbulence present in the flat pipe, thereby reducing frictional losses at the wall. Further, it can be seen that reinforcing ribs 318 are arranged on the outer side of the pipe wall 302 in the longitudinal direction X of the air duct 301, thereby increasing the torsional stiffness of the pipe. It can be seen that the spacing of the reinforcing ribs 318 in the corner region of the air duct 301 is smaller than that in the straight wall section, and the spacing of the reinforcing ribs 318 further increases towards the center of the straight wall section.

[0041] Figure 2 A second embodiment of an air duct 301 in the form of a circular duct 317 is shown. The duct wall 302 surrounding the circular flow cross-section has fastening means 303 on its inner side duct wall section 305, and... Figure 1 As in the illustrated embodiment, the fastening means 303 has two parallel linear tracks 307 including ribs facing each other. The inner side of the circular pipe 317 is also lined with ribs 315.

[0042] Figure 3a and Figure 3b The cross-sectional views of the flat pipe 316 are shown respectively, in which... Figure 3a The illustrated embodiment has a fastening means 303, while Figure 3bThe illustrated embodiment has two opposing fastening means 303. It can be seen that the flat pipe 316 has different wall thicknesses, with the wall thickness in the corner portions being less than that in the straight-wall portions, and the wall thickness increasing towards the center of the straight-wall portions. Therefore, the outer side of the straight-wall sections has a slight inclination towards their center. It can be seen that ribs 315 extending in the longitudinal direction X are distributed across the entire flow cross-section of the pipe interior 306. Furthermore, reinforcing ribs 318 extending in the longitudinal direction X are arranged on the outer side of the pipe wall 302 of the flat pipe 316. The fastening means 303 located at the bottom of the flat pipe 316 includes two opposing linear tracks 307, each linear track 307 having locking sections 308 aligned parallel to the bottom wall sections, the two locking sections 308 of the parallel linear tracks 307 facing each other. The locking sections 308 are respectively connected to and spaced apart from the lower pipe wall section by a substantially vertically arranged first section. Below the locking section 308, the linear track 307 has guide grooves in the longitudinal direction X, associated with the wall section, serving as additional linear guides for the inserted corresponding functional element. Between the linear tracks 307, the pipe wall also has ribs 315 on its inner side, exposing the relevant surfaces if an air duct is used without functional elements. Figure 3b As can be seen from the diagram, the pipe wall sections 305 of the fastening means 303 have the same shape and are opposite to each other in the height direction Z, and aligned with each other in the transverse direction Y.

[0043] Figure 4 shows a functional element 304, which can be installed in an air duct 301, and is a combination of a support element 311 and a cover 313. For securing the functional element 304, it has a snap-fit ​​leg 310 that inserts into a locking section 308 of a fastening means 303 and engages behind the locking section 308 in each case. Thus, the functional element is displaceable in the longitudinal direction X of the air duct 301 and is restricted in all other degrees of freedom. The snap-fit ​​leg 310 is connected via a snap-fit ​​leg to a support section 320 of the support element 311, wherein the snap-fit ​​leg is designed to bend into a semi-circle to form a separate cavity below, which is separated from the flow cross-section and can be used as a cable conduit 314. Figure 4b As can be seen, the thickness of the support section 320 increases towards the center and is smaller in the connection point area to the snap-fit ​​leg or cover 313 and to the force-introducing surface 319 on the upper side of the support element. The force-introducing surface 319 connects the upper end of the support section 320 in a T-shape and protrudes laterally. The outer surface of the functional element 304, i.e., the surface facing the flow channel, is covered with ribs 315.

[0044] exist Figure 5a In the perspective view, functional element 304 is shown as cover 313. Figure 5bThe image is shown as a cross-sectional view. Under the cover, when inserted into the air duct 301, a cable duct 314 extending in the longitudinal direction X is formed. The cover can be seen to have a semi-circular, dome-shaped profile; however, other cross-sections are also possible. At the lower end of the semi-circle or snap-fit ​​legs, the snap-fit ​​legs 310 are horizontal and extend away from each other in opposite directions. The surface of the cover 313 is covered with ribs 315.

[0045] Figure 6 An assembly 309 is shown of a flat conduit 316 and a functional element 304 housed therein. In this case, the housed functional element 304 is a combination of a support web and cable conduit as shown in FIG. 4, which serves to support the flat conduit in its height direction Z on one hand and to provide cable conduit 314 on the other. For assembly, the functional element 304 slides longitudinally into the flat conduit 316 from one of the flat conduit end faces, and the snap-fit ​​legs 310 of the functional element 304 are inserted into the locking section 308 of the linear track 307. During this process, the snap-fit ​​legs are compressed under slight preload to better secure them when they are inserted into the fastening means 303. It can be seen that the underside of the snap-fit ​​legs is guided in a longitudinal groove formed in the conduit wall adjacent to them. At the conduit wall section 312 opposite to the fastening means, the support element 311 supports the opposite conduit wall by abutting against the opposite conduit wall by force-introducing surface 319. A cable conduit 314 is formed between a cover 313 and a pipe wall section 305 covered by the cover 313 and having a fastening means 303, the cable conduit 314 being fluid-separated from the air conduit.

[0046] The features of the invention disclosed in the foregoing description, drawings, and claims are essential for implementing the invention individually and in any combination.

[0047] List of reference numerals

[0048] 301 Air Duct

[0049] 302 pipe wall

[0050] 303 Fastening methods

[0051] 304 Functional Components

[0052] 305 Pipe wall section

[0053] 306 Inside the pipe

[0054] 307 Linear Orbit

[0055] 308 Locked Section

[0056] 309 Components

[0057] 310 Card Connector Leg

[0058] 311 Supporting Components

[0059] 312 Relative pipe wall section

[0060] 313 Cover

[0061] 314 Cable conduit

[0062] 315 Ribs

[0063] 316 Flat Pipe

[0064] 317 Round pipe

[0065] 318 Reinforcing Ribs

[0066] 319 Force-introduced surface

[0067] 320 Support Section

[0068] X Vertical direction

[0069] Y (horizontal direction)

[0070] Z-axis height direction

Claims

1. A component (309) comprising an air duct (301) and a functional element (304) mounted in the air duct (301), wherein, An air duct (301) extends in a longitudinal direction (X) and has a duct wall (302) surrounding a flow cross section, and has at least one fastening means (303) on its inner side for fastening a functional element (304) installed in the air duct (301) in a variable position in the longitudinal direction (X) of the duct; wherein the functional element (304) includes a support element (311) supporting the air duct (301) and extending between the fastening means (303) and a duct wall section (312) opposite to the fastening means (303), characterized in that the functional element (304) has a cover (313) extending between undercut locking sections (308), thereby forming a cable duct (314) between the cover (313) and the duct wall section (305) covered by the cover (313), the cable duct (314) being separated from the flow area and extending in the longitudinal direction (X) of the duct.

2. The component (309) according to claim 1, wherein, The fastening means (303) is configured to inhibit the movement of the functional element (304) from the pipe wall section (305) including the fastening means (303) toward the interior of the pipe (306).

3. The component (309) according to claim 1, wherein, The fastening means (303) is configured to inhibit the movement of the functional element (304) in the lateral direction (Y) of the pipe wall section (305) including the fastening means (303).

4. The component (309) according to any one of the preceding claims, wherein, The fastening means (303) is configured to suppress the torsion of the functional element (304) about an axis of rotation perpendicular to the plane of the pipe wall section (305) including the fastening means (303).

5. The component (309) according to claim 1, wherein, The fastening means (303) is configured to prevent the functional element (304) from twisting about a rotation axis perpendicular to the flow cross section.

6. The component (309) according to claim 1, wherein, The fastening means (303) is configured to suppress the torsion of the functional element (304) about the axis of rotation perpendicular to the longitudinal section of the pipe.

7. The component (309) according to claim 1, wherein, The fastening means (303) includes at least one linear track (307) that extends at least partially in the longitudinal direction (X) of the pipe.

8. The component (309) according to claim 1, wherein, The functional element (304) can be pushed onto the fastening means (303) in the longitudinal direction (X) of the pipe.

9. The component (309) according to claim 7 or 8, wherein, The fastening means (303) includes two parallel linear tracks (307), each linear track having an undercut locking section (308).

10. The component (309) according to claim 8, wherein, The undercut locking sections (308) face each other or are opposite each other.

11. The component (309) according to claim 1, wherein, The fastening means (303) is integrally formed with or molded to the pipe wall (302).

12. The component (309) according to claim 1, wherein, The air duct is configured as a flat duct (316) with different wall thicknesses, wherein the wall thickness at the corner is less than the wall thickness at the straight wall, and wherein the wall thickness increases toward the center of the straight wall.

13. The component (309) according to claim 1, wherein, The functional element (304) includes two snap-fit ​​legs (310) that engage behind the undercut locking section (308) to secure the functional element (304) in the air duct (301).

14. The component (309) according to claim 1, wherein, The thickness of the support element (311) increases toward the center of the pipe and is relatively small in the area of ​​the pipe wall.

Images