Abstract
A silencer for installation in an air duct, in particular in a flat duct, having at least one sound-absorbing damping element extending essentially in a longitudinal direction (X), and having at least one holding device which accommodates the damping element at least in sections and has a fastening device for fixing the silencer in the air duct. An assembly comprising an air duct and such a silencer is further described.
Claims
1. A silencer for installation in an air duct, in particular in a flat duct, comprising c at least one sound-absorbing damping element extending essentially in a longitudinal direction (X) of the air duct, and having at least one holding device which accommodates the damping element at least in sections, wherein the holding device has a fastening device for fixing the silencer in the air duct.
2. The silencer of claim 1, which comprises at least two damping elements consisting of different sound-absorbing materials which are arranged to damp sound in different frequency ranges.
3. The silencer of claim 1, wherein the holding device has at least one, in particular spherical or lenticular, thickening arranged on its outer circumference for generating a defined clamping force between the silencer and the air duct.
4. The silencer of claim 1, wherein the fastening device comprises at least two undercut latching portions projecting in a transverse direction (Y) of the silencer.
5. The silencer of claim 4, wherein the undercut latching portions are part of at least one guide rail arranged in the longitudinal direction (X) on the outer periphery of the holding device.
6. The silencer of claim 1, wherein the holding device has two half-shells which are detachably connected to one another, in particular in a height direction (Z) of the silencer, and between which the damping element is received and fixed at least in sections.
7. The silencer of claim 6, wherein the outer contour of the interconnected half-shells corresponds to the flow cross-section of the air duct.
8. The silencer of claim 6, wherein the half-shells enclose at least one air passage oriented in the longitudinal direction (X).
9. The silencer of claim 6, wherein at least one web is formed between the interconnected half-shells, which web traverses the flow cross-section perpendicularly to the longitudinal direction (X) and has an open damping element receptacle facing the damping element in the longitudinal direction (X), in which receptacle the damping element is received at the end face.
10. The silencer of claim 9, wherein the damping element extends through the flow cross-section in the direction corresponding to the web perpendicular to the longitudinal direction (X).
11. The silencer of claim 9, wherein the web is disposed in the retainer so as to centrally divide the air passage.
12. The silencer of claim 9, wherein a retaining means for retaining the damping element is provided in the damping element receptacle.
13. The silencer of claim 12, wherein the retaining means comprises retaining prongs oriented transversely to the longitudinal direction (X), onto which the damping element is slipped.
14. The silencer (401) of claim 9, wherein the silencer receptacle (420) comprises air guide surfaces (410) surrounding the silencer element (402) in the longitudinal direction (X) and laterally shielding the silencer element (402) from the at least one air passage (408).
15. The silencer of claim 14, wherein the air guide surfaces meet on the side of the web facing away from the damping element, tapering the web in the longitudinal direction (X).
16. The silencer of claim 4, wherein the holding device comprises a plurality of parallel spaced apart webs in which a corresponding plurality of parallel spaced apart damping elements are received.
17. The silencer of claim 9, wherein the opposing end faces of the at least one damping element are held by two opposing holding devices, wherein the damping element receptacles of the holding devices are aligned facing each other.
18. An assembly of an air duct and a silencer according to claim 1, wherein the silencer is fixed in the air duct by means of the fastening device (404).
19. The assembly of claim 18, wherein the air duct includes fastening devices complementary to the fastening devices of the silencer.
Description
DRAWINGS
[0030] Further features, advantages and characteristics of the invention can be seen in the following description of preferred embodiments of the invention with reference to the accompanying drawings, in which show:
[0031] FIG. 1 is a perspective exploded view of an embodiment of the silencer according to the invention;
[0032] FIG. 2 is a perspective exploded view of a holding device according to the invention;
[0033] FIG. 3 is a perspective view of an assembly process of the silencer according to the invention; and
[0034] FIG. 4 is a perspective view of a silencer according to the invention received in an air duct.
DETAILED DESCRIPTION
[0035] FIGS. 1 and 2 show an embodiment of the silencer 401 with two holding devices 403 arranged on the front side and three parallel damping elements 402 positioned therebetween and spaced apart in the transverse direction Y. The silencer extends essentially in a longitudinal direction X. Further, the silencer 401 has a transverse direction Y and a height direction Z. In operation, the silencer 401 is inserted into an air duct corresponding to its dimensions, wherein exhaust air to be discharged, in particular a fume extraction hood, flows through the silencer 401 in longitudinal direction X. For this purpose, the exhaust air flows into one of the holding devices 403, passes through the free spaces bounded by the damping elements 402 and flows out of the opposite holding device 403 again from the silencer 401. For adaptation to different air duct elements or locations of use within the exhaust air system, the damping elements 402 can be shortened to the desired length. Due to damping elements 402 being separated from each other, different insulation materials can be used within the silencer 401 at the same time in order to be able to individually adapt the silencing to installation specifications or special customer requirements. The holding devices 403 each comprise a half-shell-shaped upper part 406 and a half-shell-shaped lower part 407, wherein these have an outer contour in the assembled state which corresponds to the inner contour of a flat channel. Between the upper and lower parts 406, 407, two parallel air passages 408 are formed, through which air can flow in and out of the silencer in the longitudinal direction X. The air passages 408 are formed in the longitudinal direction X. Three, in particular evenly spaced webs 409 are formed between the upper and lower parts 406, 407, which are bounded laterally by air guide surfaces 410 and have damping element receptacles 420 at the rear. In the parting plane between the upper and lower parts 406, 407, the webs 409 each have surfaces facing one another, on which releasable connecting devices 413 are arranged in each case. As shown, the detachable connecting device has a latching pin and a latching hole arranged next to it for each surface. Since the upper part and the lower part are designed as identical parts, the latching pins engage in the respective opposite latching holes. On the front side, i.e. on the air inlet side, the central web 409 has a flow-optimized taper 412, at the tip of which the lateral air guide surfaces 410 meet. The lateral webs 409 also have tapers 412, whereby these have a tip which is formed from an air guide surface 410 facing the air passage 408, which meets the outer contour of the holding device 403 or the respective half shell 406, 407 on the front side. In the assembled state, the individual opposing web elements such as the air guide surfaces 410 are aligned with each other in the height direction Z. Above the central web 409, the holding device has a fastening device 404 for fastening the silencer in an air duct 421, which is implemented by L-shaped grooves formed in the outer contour of the holding device 403 with laterally projecting guide catches 405. The silencer 401 may have corresponding fastening devices 404 on its upper or lower side only, as well as on both its upper and lower sides. FIG. 2 also shows thickenings 423, which are arranged on the outer circumference of the holding device 403 and are realized as variously designed local material accumulations. The thickenings 423 serve to create a clamping connection between the air duct 421 and the holding device 403. Of course, in addition to the embodiment shown, further embodiments can be provided which have only one of the two fastening devices described above as the fastening device in each case, i.e. either L-shaped grooves with laterally projecting guide catches 405 or thickenings 423. In the embodiment with thickenings 423, it can furthermore be provided in particular that the air duct does not have its own fastening device. The damping elements 402 are made of different materials, wherein illustrated the middle silencer element 414 is made of a material different from that of the outer silencer elements 415. As can be seen on the rear holding device 403, the damping element receptacles 420 each have retaining prongs 411 aligned in the height direction Z, by means of which the respective damping element 402 can be fastened in the respective damping element receptacle 420. At the same time, openings to the respective silencer elements 414, 415 are provided on the outer circumference of the holding devices 403, through which these can be pressed out of or removed from the holding devices from the outside, for example if an damping element is to be replaced after a certain running time. In particular, it can be readily seen in FIG. 2 that the holding device 403 has concave indentations 419 distributed around its outer circumference at the front and set back in the longitudinal direction X, which indentations are arranged on the half-shell sections 418 extending substantially in the transverse direction Y and bounding the air inlets 408. Furthermore, it can be seen that likewise the webs 409 have a concave course at the front in the height direction Z, set back in the longitudinal direction X. These concave elements provided in two different planes have the particular advantage of optimizing the flow behavior of the incoming air. FIG. 2 further shows that the lateral silencer elements 415 have, in the region of their associated damping element receptacles 420, an outlet region 417 which widens the flow cross section and is adapted to the contour of the associated damping element receptacles 420. Also visible are lateral recesses 416 on the outer upper and lower sides of the lateral silencer elements 415.
[0036] FIG. 3 shows an assembled silencer 401 which is inserted into a flat duct 421 in longitudinal direction X for assembly. The attenuator elements 402 are fixed in the respective attenuator element receptacles 420 by being slipped onto the retaining prongs 411 and then upper and lower parts 406, 407 of the holding devices 403 are clipped together via the releasable connecting device 413. When assembled, the silencer elements 402 are completely shielded from the air guide surfaces 410 in the area of the air passages 408. Each air passage 408 is aligned with an opposite air passage 408 of the opposite holding device. Between them, the air flowing through is channeled laterally by insulating mats 414, 415 of different materials. To insert the silencer, the fastening device 404 is threaded into the complementary fastening device 422 of the flat channel 421 under a slight pretension, so that the silencer can be pushed to the desired position by means of slight pressure. The bias is selected so that the silencer 401 remains in the desired location even in a vertically oriented flat channel.
[0037] Finally, FIG. 4 shows the final position of the silencer 401 in the flat duct 421, with the holding device 403 resting against the inner contour of the flat duct 421, thus providing the largest possible flow cross-section to minimize the flow resistance generated by the silencer.
[0038] The features of the invention disclosed in the foregoing description, in the drawings as well as in the claims may be essential to the realization of the invention both individually and in any combination.
