EP2633178A1

EP2633178A1 - Silencer device for a fluid line and heating unit having a silencer device

Info

Publication number: EP2633178A1
Application number: EP11776416.7A
Authority: EP
Inventors: Harald Trumler; Marco Pietrzyk; Werner Zimmermann; Nikolaus Gerhardt; Peter Neidenberger
Original assignee: Webasto SE
Current assignee: Webasto SE
Priority date: 2010-10-26
Filing date: 2011-10-26
Publication date: 2013-09-04
Also published as: US8919491B2; CN103249941A; CN103249941B; DE102010049578A1; WO2012055900A1; US20130327584A1

Abstract

The invention relates to a silencer device (10) for a fluid line (12), having a resonator arrangement (14) which comprises a first resonator tube (16) with a first resonator chamber designed for λ/4 damping of at least one sound wavelength, wherein the first resonator tube has a first longitudinal direction, two end walls (31, 33) situated opposite one another in the first longitudinal direction, and a first side wall (23) which extends between the end walls, and wherein the first resonator chamber is formed between the first side wall and the end walls (31, 33) of the first resonator tube (16). The resonator arrangement (14) further comprises a second resonator tube (18) with a second resonator chamber designed for λ/4 damping of at least one sound wavelength, wherein the second resonator tube has a second longitudinal direction, two end walls situated opposite one another in the second longitudinal direction, and a second side wall (25) which extends between the end walls, and wherein the second resonator chamber is formed between the second side wall and the end walls of the second resonator tube. The first resonator tube and the second resonator tube are connected to one another in a sound-transmitting fashion via a first connecting orifice (17) between the first side wall and the second side wall.

Description

Silencer device for a fluid line and heater with a silencer device

The present invention relates to a silencer device for a fluid line and a heater with a silencer device.

In many cases today pneumatic or hydraulic units are used, which can generate a not inconsiderable noise pollution. In particular, in the case of aggregates which are used spatially close to a space normally used by humans, this can lead to considerable disturbances. For example, in the case of motor vehicles for a driver and passengers, it is not possible to avoid noise pollution by units in the vehicle such as a heater. In particular, in a heater, the intake area of a fluid such as air may be a significant source of noise.

In known muffler devices absorption materials are often used to achieve a sound attenuation. Such absorbent materials can be arranged, for example, around suction lines of a heater. However, absorption materials are generally expensive and do not always achieve a desired sound attenuation in all relevant frequency ranges. Especially in the low-frequency range of below 1 kHz sound frequency, most known absorber materials are not efficient dampers. For sufficient damping, therefore, a considerable amount of absorption material must be used, which leads to a verteu tion of the muffler device. In addition, the muffler device must be sufficiently large to accommodate the absorbent material can. Especially for use in mobile applications such as a vehicle, however, a compact design is desirable. It is therefore an object of the present invention, in particular for motor vehicles, and in particular for heaters for motor vehicles, to provide a silencer device for a fluid line which is inexpensive to produce and in particular achieves a desired sound attenuation even in low frequency ranges. This object is solved by the features of the independent claims. Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims. According to the invention, a silencer device for a fluid line is provided which has a resonator arrangement. The resonator assembly comprises a first resonator tube having a first resonator cavity formed for λ / 4 attenuation of at least one acoustic wavelength, the first resonator tube having a first longitudinal direction, two end walls opposite each other in the first longitudinal direction, and a first sidewall extending between the end walls; and a second resonator tube having a second resonator cavity formed for λ / 4 attenuation of at least one sonic wavelength, the second resonator tube having a second longitudinal direction, two end walls opposite each other in the second longitudinal direction and a second side wall extending between the end walls, and wherein the second resonator space is formed between the second side wall and the end walls of the second resonator tube. The first resonator tube and the second resonator tube are connected to each other in a sound-transmitting manner via a first connection opening between the first side wall and the second side wall. The first resonator tube is connected via a connection opening sound transmitting with the fluid line or connectable. This results in a compact series connection of the resonator tubes of the resonator arrangement. For λ / 4 attenuation of a wavelength, each of the resonator tubes is designed such that its resonant length corresponds to a quarter of a wavelength of a specific noise or a specific noise component. In general, the distance between the end walls of a resonator tube may be referred to as a resonator length. The distance between an end wall of a resonator and the edge of a connection opening or a connection opening of the resonator tube facing this end wall can be referred to as resonance length. It is conceivable that a resonator tube has two openings, such as a connection opening and a connection opening. Accordingly, a resonance tube may have a plurality of resonance lengths. In addition, optionally, a single opening may have different resonance lengths with respect to both end walls of a resonator tube. Within a resonator arrangement, the resonator tubes can have the same resonator lengths and / or resonance lengths. At the same resonance lengths, a particularly good attenuation of the associated wavelength results, since several resonator tubes contribute to the attenuation. At different resonator lengths and / or resonance lengths, the bandwidth of the attenuation can be significantly increased. By connecting the resonator tubes in series, further resonance lengths are obtained which each extend from an end wall to the edge of a connection opening or the connection opening. These further resonance lengths extend over more than one resonator tube. For these further resonance lengths, the length between associated side walls or the thickness of an inner wall play a role that must pass through a sound wave. It is expedient to design the resonator lengths, resonance lengths and other lengths to be considered by sound waves in the muffler device in such a way that the desired attenuation of certain frequencies or wavelengths of sound waves is achieved. Thus, according to the invention, in particular, the first resonator tube can serve as a λ / 4 tube for a first wavelength or a first frequency, while the resonator arrangement as a whole with the series-connected first and second resonator tubes with a composite total length as a λ / 4 tube for a lower Frequency works. The second resonator tube can accordingly contribute to the attenuation of the first wavelength or be designed to attenuate a further wavelength. By dimensioning and positioning the connection opening and / or the connection opening, the damping properties of the individual resonator tubes and the entire resonator arrangement can be determined. A connection opening may be formed such that it allows a sound-transmitting connection between associated side walls. In particular, a connection opening can represent a continuous opening between the side walls or in an inner wall. Conveniently, the entire opening area of a connection opening or a connection opening corresponds to or is larger than a cross-sectional area of the fluid line. The cross-sectional area of the fluid conduit may have a normal that is parallel to fluid flow through the conduit. Thus, a sufficient sound dissipation in the resonator can be done and a sufficient pressure compensation for the desired damping can be ensured. Generally, a sidewall of a resonator tube may extend in particular parallel to a normal direction of one of the end walls of the resonator tube. A side wall may in particular designate a wall directed towards the inside of a resonator tube or to the resonator chamber. A side wall may be formed by the respective sides of two walls, which the Surround resonator tube or the resonator chamber. It can be provided that a connection opening has a normal, which runs orthogonal to the longitudinal direction of one of its associated resonator tubes. A longitudinal direction may in particular be the direction of the greatest extent of a resonator tube. The longitudinal direction may be defined by the opposite end walls. Each of the end walls may be formed as a continuous element without holes. Conveniently, an end wall is suitable for reflecting the sound waves to be damped. The resonator can be formed in one piece. However, it is also conceivable that the resonator arrangement is formed by a plurality of elements. The components of a multi-piece resonator assembly may be at least partially fixedly connected together in a suitable manner, such as by welding, screwing, gluing or clipping. In particular, it can be provided that the resonator arrangement has two or more than two components which are inserted into one another. The resonator assembly or the components of the resonator assembly may be made of any suitable material, such as metal or preferably a hard plastic material such as a polyamide material. A resonator tube may have a round, a rectangular, in particular square, or any other suitable cross-section. The muffler device is particularly suitable for a heater, in particular a heater of a motor vehicle. It can be provided in the intake of a heater for motor vehicles. The fluid line may have a supply port and a drain port. In particular, the fluid line can be an intake line or can be connected or connectable to an intake line. It is conceivable that the fluid line is an air intake line, for example for a heater. The resonator arrangement can be designed such that it completely surrounds the fluid line. It may be expedient for the connection opening and / or the connection opening to completely circulate the associated side walls or the fluid line, for example, by defining an opening circle with a specific opening width, for example. The opening widths of different openings may be the same or different. A sound-transmitting connection is intended to transmit sound waves, if possible without changing their frequency. Such a connection can be made for example via an opening. It can also be provided that a membrane is arranged above an opening. A sound transmitting connection or opening may also be suitable for conducting a fluid. A fluid can be a liquid or a gas, in particular air. The muffler device may comprise absorption material. The Sorbent material may surround the fluid conduit and / or a fluid supply and / or a fluid drain. The resonator arrangement can generally be designed as an arrangement of resonator tubes which surround one another concentrically and are interconnected by connection openings. The resonator tubes can surround the fluid line concentrically.

It can be provided that the first longitudinal direction and the second longitudinal direction extend parallel to one another. Thus, the resonator tubes can be arranged close to each other, which enables a compact construction of the resonator arrangement.

The first and second side walls may have a common inner wall in which the first connection opening is provided. In general, an inner wall can each be designed to at least partially form the side wall of two adjacent resonator tubes or a resonator tube and the fluid line. Thus, for example, the first side wall and the second side wall are each formed by that side of the inner wall which faces the first or second resonator chamber. A common inner wall can be multi-layered. It is also conceivable that the common inner wall is formed in one piece. This results in a particularly compact design of the resonator.

It can be provided that the first connection opening is arranged in an end region of the first and / or the second resonator tube. An end region may lie in the region of an end wall. In particular, the connection opening may extend from the end wall to an edge facing the opposite end wall. Thus, the resonator length of the resonator tubes can be used to form the resonant length to minimize the overall extension of the muffler device. In particular, it can be provided that the first connection opening interrupts at least a portion of a connection of the inner wall or one of the side walls with the end wall.

In a development, the connection opening may be provided in an end region of the first resonator tube. In this case, the connection opening may be provided in the end region of the resonator tube, which is opposite to the end region in which the connection opening is provided. Thus, essentially the full length of ge the resonator tube connected to the fluid line can be used as a resonance length. The first connection opening may be provided in an end portion of the first resonator tube, that is, at or near one of the end walls, while the connection opening may be provided in the other end portion, that is, at or near the other end wall of the first resonator tube. Thus, the openings are not directly opposite, whereby the length of the resonator tubes can be exploited.

The muffler device expediently comprises the fluid line. Thus, the muffler device can be easily connected via the fluid line, for example with a fluid connection of a device to be damped as a heater of a motor vehicle. It is conceivable that the fluid conduit is at least partially formed by a wall which forms a side wall of one of the resonator tubes. It can also be provided that the muffler device is designed such that it is constructed without fluid line and is subsequently mounted on an already existing fluid line. For this purpose, it may be necessary to provide the fluid line with a corresponding connection opening, to which the silencer device can be connected or connected. The muffler device may further comprise a third resonator tube having a third resonator cavity formed for λ / 4 attenuation of at least one acoustic wavelength, the third resonator tube having a third longitudinal direction, two end walls opposite each other in the third longitudinal direction, and a third sidewall extending between the end walls; wherein the third resonator cavity is formed between the third sidewall and the end walls of the third resonator tube, the third resonator tube being connected or connectable to the fluid conduit by a second connection opening. The third resonator tube can achieve the attenuation of another sound frequency that depends on the selected length of the third resonator tube. It is also conceivable to provide additional resonator tubes, which are connected or connectable via their own connection openings with the fluid line.

It may be expedient that the resonator arrangement further has at least one further resonator tube with a further resonator space designed for λ / 4 attenuation of at least one wavelength of a sound signal, wherein the further one Resonator tube has a further longitudinal direction, two opposite each other in the longitudinal direction opposite end walls and extending between the end walls further side wall and wherein the further resonator space is formed between the further side wall and the end walls of the further resonator tube. The further resonator tube and the first or second resonator tube are connected to each other in a sound-transmitting manner by a second connection opening between the further side wall and the first or second side wall. Thus, a series connection of at least three resonator tubes may be provided in the resonator arrangement. The further longitudinal direction or longitudinal directions can run parallel to the first and / or second longitudinal direction. For the arrangement of the second connection opening, the statements made above for the first connection opening apply analogously. When three resonator tubes are used, the resonator arrangement acts as a λ / 4 tube for different frequencies. Namely, each resonator tube acts individually with its length as a λ / 4 tube. With different lengths of the resonator tubes, therefore, different frequencies can be damped solely by the individual resonator tubes. In addition, the resonator tubes act with the sums of their lengths, for example the first resonator tube combined with the second resonator tube, the second resonator tube combined with the third resonator tube, and all three resonator tubes together for a wavelength corresponding to the summed resonance length as λ / 4 -Tube. It is of course possible to connect more than three resonator tubes via suitable connection openings sound-transmitting. In each case two of the interconnected resonator tubes may have a common inner wall, as described above. The first connection opening may be provided in one end portion of the second resonator tube, that is, at or near one of the end walls, while the second connection opening may be provided in the other end portion, that is, at or near the other end wall of the second resonator tube. Thus, the connection openings are not directly opposite, whereby the length of the resonator tubes can be exploited.

The first longitudinal direction may run parallel to a longitudinal direction of the fluid line and / or a flow direction of fluid in the fluid line. This allows a particularly compact design of the muffler device. In addition, it can be provided that a connection opening has a normal, which is orthogonal to the flow direction of the fluid in the fluid line. Thus, on the one hand, a good tion of disturbing noises through the connection opening, on the other hand, the connection opening on the flow of the fluid in the fluid line has the least possible influence. The fluid may be in particular sucked or discharged air. It is particularly advantageous if the muffler device has two or more resonator arrangements which are each connected or connectable to the fluid line via a connection opening. Each resonator arrangement can have at least two resonator tubes, which are arranged as described above and connected to one another via connection openings. It is particularly expedient if the lengths of the resonator tubes of the resonator arrangements differ from one another. Moreover, it is possible that the lengths of the resonator tubes differ from one another within a resonator arrangement. Thus, a large spectrum of frequencies can be damped. The resonator arrangements can be connected in series in the flow direction. It is also conceivable to arrange the resonator arrangements with respect to the fluid line opposite one another. In this case, each resonator arrangement should be connected or connectable to the fluid line via its own, suitably designed connection opening which only partially surrounds the fluid line. A combination of both arrangement concepts with several resonator arrangements is conceivable.

A muffler device is also conceivable, which is connected or connectable to an absorption device as an alternative or in addition to some or more of the abovementioned features. The absorption device may comprise a plurality of layers, for example a sealing layer and an absorption layer. The absorption layer may be a sound-damping layer, which may be an elastic layer. It is conceivable that the absorption layer has, for example, an open-pored foam as a sound-absorbing material. The sealing layer may comprise a fluid-tight material that may be elastic. In particular, the sealing layer may comprise a closed-cell foam. The sealing layer can be materially bonded to the absorption layer. It can be provided that the sealing layer is connected as a lamination with the absorption layer. The bonding or lamination between the absorbent layer and the sealant layer can be made, for example, by a suitable adhesive, wax, resin, or thermal treatment, such as dry lamination, wet lamination, and / or thermo-lamination. In particular, it may be provided that the absorptive onsschicht and the sealing layer are integrally formed. Thus, the absorber can provide both sound attenuation and sealing. In this case, can be dispensed with an additional separate seal, which facilitates the production and assembly of the muffler device. The sealing layer can be designed and arranged in such a way that it completely covers and seals a contact area between the silencer arrangement and the connection body. It is expedient if the absorption layer is wider than the sealing layer in order to allow a good sound absorption. The absorption layer may comprise a suitable sound-damping material, for example an open-pored foam which is suitable for sound damping in a certain frequency range. The sealing layer may be formed sound-impermeable. In particular, it can be provided that the sealing layer is designed not to conduct sound from the muffler device to the outside. The material of the sealing layer may have a sound-absorbing or reflective effect in a suitable frequency range. The silencer device can be connectable or connected to a fluid connection via a connection body. The connection body may, for example, have a suitable pipe connection for connection to a fluid connection. It is conceivable that the muffler device is at least partially received in the connection body in a connection region. For this purpose, the connection body may, for example, have a side wall surrounding the sound-damping device. The absorption device can be arranged or accommodated in the connection body and / or between the connection body and the silencer device. In particular, the absorption device can thus be connected or connectable via the connection body with the muffler device. It can be provided that the absorption device is accommodated in the connection body in such a way that the sealing device seals the connection body with respect to the silencer device. In particular, the absorption device can be accommodated in the connection body in such a way that it seals the silencer device and / or a boundary wall and / or outer wall of the silencer device with respect to the connection body. For this purpose, for example, the absorption device may be accommodated such that the sealing layer sealingly bears against the inside of a side wall of the connection body and / or on a boundary wall and / or outer wall of the silencer device. In this case, the sealing layer can rest non-positively and / or positively against the boundary wall and / or the side wall and / or outer wall. In the absorption device, a fluid-conducting channel may be provided, which has a fluid-conducting connection between the Fluid line of the muffler device and a fluid connection can provide. The connection body and the muffler device can be connected or connectable to one another in a force-locking and / or form-fitting manner. It is conceivable that a boundary wall and / or an outer wall of the silencer device has at least one elastic region, which may be, for example, a curved region of the wall. The connecting body can be placed or pushed onto the muffler device. It can be provided in particular that the elastic region is compressed by the connection body. In this case, a restoring force of the elastic region can provide a non-positive and / or positive connection between the connection body and the boundary wall and / or outer wall. For example, the boundary wall and / or outer wall can be pressed against a surrounding side wall of the connection body. It can be provided that the connection body is connected or connectable via a latching connection with the muffler device.

The invention also relates to a heater, in particular a heater for a motor vehicle, with a silencer device described above. The fluid line can be designed in particular as a line for sucked air for the heater. The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments.

1 shows a schematic representation of a first muffler device;

Figure 2 is a schematic representation of a further muffler device;

Figure 3 is a schematic representation of a further muffler device with

Absorption material and with additional components attached to the muffler device;

Figure 4 is a schematic representation of a connector body for a muffler device. In the following description of the figures, the same reference numerals designate the same or functionally similar components.

1 shows a schematic representation of a muffler device 10. The muffler device 10 comprises a fluid line 12, through which a fluid, in particular air, can be guided. The fluid line has a fluid outlet 11 and a fluid supply 13. Accordingly, a flow direction of the fluid in the fluid line 12 extends from 13 to 11, in the drawing, therefore, from right to left. Sound propagation from an aggregate connected to the fluid outlet 11, such as a heating device, takes place in the opposite direction. The fluid line 12 is surrounded by a resonator arrangement 14 which has three resonator tubes 16, 18 and 20 connected in series and concentrically with each other. The resonator tube 16 is connected in a sound-transmitting manner to the fluid line 12 via a connection opening 15 in a wall 22. Only a small fluid exchange takes place via the connection opening 15, since the resonator arrangement 14 has no outflow. The wall 22 forms an inner part of a side wall 23 for the resonator tube 16 connected to it. An inner wall 24 forms another, outer part of a side wall 23 of the resonator tube 16. The inner wall 24 also forms an inner part of the side wall 25 of the resonator tube 18 and can be regarded as a common inner wall of the resonator tubes 16 and 18. There is further provided a further inner wall 26 forming an outer portion of the side wall 25 and an inner portion of a side wall 27 of the adjacent resonator tubes 18 and 20. An outer wall 28 bounds the resonator assembly 14 to the outside and forms another, inner part of the side wall 27 of the resonator tube 20. The resonator tubes 16, 18 and 20 are closed by delimiting walls 30, 32 extending orthogonally to the inner walls. By the boundary wall 30, an end wall 31 is formed for the resonator 16. The other boundary wall 32 forms a second end wall 33 for the resonator tube 16. The end walls 31, 33 face each other with respect to a longitudinal direction of the resonator tube 16. Similarly, the boundary walls 30, 32 form end walls for the resonator tubes 18 and 20. The end walls of a resonator tube are each opposite to a longitudinal direction of the associated resonator tube. It is of course also possible that instead of common boundary walls, each resonator tube is manufactured individually and has its own, separately formed end walls. The end walls and side walls are substantially impermeable to sound to be damped. In particular, the end walls are for reflection to be damped Schallwel- suitable. Between the side walls and the end walls of a resonator tube an unnamed resonator space is formed in each case. As can be seen in FIG. 1, the connection opening 15 completely surrounds the fluid line 12. The total area of the circumferential connection opening 15 is chosen such that it equals the cross-sectional area of the fluid line 12. The resonator tube 16 is connected in a sound-transmitting manner via a connection opening 17 to the resonator tube 18. The connection opening 17 is provided in the inner wall 24 lying between these resonator tubes and thus in each case extending between the side walls 23, 25 of these resonator tubes. Similarly, the resonator tube 18 is connected in a sound-transmitting manner to the resonator tube 20 via a connection opening 19 provided in the inner wall 26. The connection openings 17, 19 each lie in an end region of the resonator tubes. In particular, the connection openings 17, 19 adjoin associated end walls or extend perpendicularly from adjacent end walls. The connection openings 17, 19 each form a circle surrounding the associated inner wall 24, 26. The total area of a connection opening 17, 19 corresponds to the cross-sectional area of the fluid line 12. The resonator tubes 16, 18 and 20 are designed such that they result in a concentric arrangement around the fluid line 12. The absorption device 40 may completely surround the fluid line 12 or the fluid outlet 11 and be designed for high-frequency damping. The absorption material of the absorption device 40 may in this case consist of a foam, which shows a good absorption behavior, especially at high frequencies. Since the absorption material is intended for damping relatively high frequencies (higher than one kHz), no particularly thick absorption material layer is necessary, so that the absorption material can be limited to the overall height of the resonator arrangement 14, for example. The resonator arrangement 14 is expediently dimensioned such that the resonator tubes 16, 18, 20 have the same resonator lengths from end wall to end wall. The resonator length can be 80mm in this example. The connection opening 15 and the connection openings 17, 19 can be 5 mm wide. A single resonator 16, 18, 20 thus acts as a λ / 4 damper for sound waves having a frequency of 1002 Hz. Two adjacent resonator tubes together, for example resonator tubes 16 and 18, act as λ / 4 dampers for a frequency of 521 Hz. Three resonator tubes act together as λ / 4 dampers for a frequency of 350 Hz. The damped frequencies are only almost in an integer ratio to each other, since the respective total resonance length is composed of the resonance length of one of the resonator tubes with the opening participating in the resonance and the resonator length or the resonator lengths of the resonator tubes, whose end walls play a role in the resonance. In addition, the thickness of the walls 22, 24, 26 plays a role. For example, a resonant length of the resonators 16 and 18 is determined by the length between the edge of the connection opening 15 to the end wall 31, the length of the resonator 18 between the end walls and the thickness of the inner wall 24. It is understood that 14 λ / 4 attenuation for different sound wavelengths takes place through the resonator 14. The resonator tubes 16, 18, 20 are aligned with respect to their longitudinal directions parallel to one another and parallel to the longitudinal direction of the fluid line 12 or to the flow direction of fluid in the fluid line 12. The muffler device shown is particularly suitable for a heater of a motor vehicle.

FIG. 2 shows a variant of a muffler device 10 from FIG. 1, with only the differences from FIG. 1 being discussed in greater detail. In this variant, two connection body 42, 44 are provided, each of which provide a fluid port 13, 1 1 for connecting the fluid line 12 to other, not shown components or as described above for fluid supply or fluid discharge. The connecting body 42 carries the inner walls 22 and 26. The connecting body 44 carries the inner wall 24. About the outer wall 28, the connecting body 42, 44, for example, by gluing, welding or gluing together. The terminal body 42 has a boundary wall 30 which forms the end walls of the resonator tubes 16, 18 and 20 on the side of the terminal body 42. Similarly, the connecting body 44 forms a boundary wall 32 and thus the opposite end walls of the resonator tubes 16, 18, 20. The resonator 14 can be assembled in this example by simply nesting two components, namely the connecting body 42, 44. It is also conceivable that the outer wall 28 is formed as a separate component, which is connected to the connection bodies 42, 44 as described above.

FIG. 3 shows a further variant of a muffler device 10 from FIG. 1, wherein only the distinction to FIGS. 1 and 2 will be discussed in greater detail. In this example, an absorber 46 is provided between the fluid conduit 12 and an inner wall 41 of the resonator tube 16. The absorption device 46 surrounds the fluid line 12. Thus, the wall 41 and the absorber 46 forming the Layer of absorbent material can be considered together fulfilling the function of the inner wall 22 of Figure 1. It is conceivable to design the absorption material in such a way that it is fluid-tight and thus simultaneously constitutes a boundary for the fluid guided in the fluid line 12. For this purpose, for example, the absorption material may optionally be suitably coated with a sound-permeable coating 21. In this variant, it can be seen that the connection body 44 is a component produced separately from the outer wall 28. The boundary wall 32 is formed by a wall integrally formed with the outer wall 28. The connection body 42 carries the inner walls 26 and 41. Thus, connection body 42 and the outer wall 28 can be particularly easily connected by a clip connection 48. Also, the terminal body 42 may be connected by a clip connection 50 with the outer wall 28. Between the connection body 44 and the boundary surface 32, a further absorption device 40 is added. This can be designed to attenuate the same frequencies as the absorption device 46. The absorption device 40 can also be suitable for attenuating other frequencies, in particular for attenuating lower frequencies. In fact, in the construction shown here, it is possible to form the absorption device 40 with a greater installation depth than the absorption device 46, since it extends substantially from the edge of the fluid line 12 to the height of an outer wall region of the resonator arrangement. As a result, lower frequencies can be damped than by the absorption layer 46, which is thinner in comparison. On the connecting body 42, a water separator 52 is furthermore provided, which in a known manner serves to separate water from the supplied air.

FIG. 4 shows a schematic illustration of a connection body for a silencer device, which may in particular be one of the silencer devices 10 described herein. In the illustrated assembled state, the arrangement can be regarded as a muffler device with a connected connection body. Shown is a connection body 44, which provides a fluid connection 1 1 for the fluid line 12. For this purpose, the connection body 44 has a pipe connection which is received in a transverse wall 49 of a connection body wall 45. The connection body wall 45 furthermore has a side wall 47. The transverse wall 49 extends approximately transversely to the flow direction of a fluid in the fluid line and is formed between the pipe connection and the side wall 47. In this example, the connection body 44, which comprises the pipe connection and the connection body wall 45 with transverse wall 45 and side wall 47, is integrally formed. The side wall 47 surrounds the silencer device at least partly from the outside and picks them up. In particular, the side wall 47 may at least partially surround and / or be in contact with a boundary wall 32 and / or an outer wall 28 of the muffler device. The side wall 47 may be formed parallel to the fluid line 12. The connecting body 44 may in particular be placed or pushed onto the muffler device 10. The boundary wall 32 has a bent elastic region 34. Thus, the boundary wall 32 and / or an outer wall 28 of the muffler device connected thereto can be elastically adapted to the surrounding side wall 47 of the connection body 44. In this case, a non-positive and / or positive connection between the sound damper device 10 and / or the boundary wall 32 and / or an outer wall 28 and the connection body 44 can be provided. In particular, a non-positive and / or positive connection between the boundary wall 32 and / or outer wall 28 and the surrounding side wall 47 can be provided. Because the boundary wall 32 can be easily compressed by the side wall 47 and presses due to their elastic properties provided by the elastic properties in turn from the inside against the side wall 47. Between the terminal body wall 45 and the boundary wall 32, an absorption device 40 is added. The absorption device 40 is thus accommodated in a limited by the boundary wall 32, the transverse wall 49 and the side wall 47 receiving space. The absorption device 40 has an absorption layer 54 and a sealing layer 56. The absorption layer 54 consists of a sound-damping material, for example an open-pore foam. The sealing layer 56 may consist of a fluid-tight elastic material, in particular a closed-cell foam. The sealing layer 56 is connected as a lamination and / or materially bonded to the absorption layer 54. This compound may be provided, for example, by a suitable adhesive, wax, resin, or suitable thermal treatment, such as by wet lamination, dry lamination, and / or thermo-lamination. It is provided that the absorption device 40 and in particular the sealing layer 56 is accommodated in the receiving space such that the sealing layer 56 provides a seal between the connecting body 44 and the muffler device 10 and / or the boundary wall 32. In particular, the sealing layer 56 provides a seal at the points A and B at which the side wall 47 of the connection body 44 contacts the muffler device and in particular the boundary wall 32. The sealing layer 56 is designed to completely cover the contact region between the muffler device and the connection body 44 and to seal it off. in particular, points A and B in which the boundary wall 32 and the connection body 44 touch each other. Thus, it can be prevented that undesirable from the outside fluids and contaminants penetrate via the connector body 44. The sealing layer 56 may be formed such that it does not transmit sound from the muffler device to the outside, but absorbs and / or reflects. Thus, the leakage of noise from the muffler device is prevented. By laminating the sealing layer 56 and the absorption layer 54 can be dispensed with a separate seal, such as an O-ring. As a result, the installation and production of the muffler device 10 are considerably simplified. It is understood that the absorption device 40 shown can also be used in the examples of FIGS. 1 to 3.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential for the realization of the invention either individually or in any combination.

LIST OF REFERENCE NUMBERS

10 muffler device

1 1 fluid drain

12 fluid line

13 fluid supply

14 resonator arrangement

15 connection opening

16 resonator tube

17 connection opening

18 resonator tube

19 connection opening

20 resonator tube

22 inside wall

23 side wall

24 inner wall

25 side wall

26 inner wall

27 side wall

28 outer wall

30 boundary surface

31 end wall

32 boundary surface

33 end wall

34 elastic range

40 absorption device

42 connection body

44 connection body

45 connection body wall

46 absorption device

47 sidewall

48 clip connection

49 transverse wall Clip connection Water separator Absorption layer Seal layer

Claims

claims

1. muffler device (10) for a fluid line (12),

with a resonator arrangement (14), which comprises:

a first resonator tube (16) having a first resonator cavity formed for λ / 4 attenuation of at least one acoustic wavelength, the first resonator tube (16) having a first longitudinal direction, two end walls (31, 33) opposite each other in the first longitudinal direction, and one between the first resonator tubes (16) End wall extending first side wall (23) and wherein the first resonator space between the first side wall (23) and the end walls (31, 33) of the first resonator tube (16) is formed,

a second resonator tube (18) having a second resonator cavity formed for λ / 4 attenuation of at least one sonic wavelength, the second resonator tube having a second longitudinal direction, two end walls opposite each other in the second longitudinal direction and a second sidewall (25) extending between the end walls and wherein the second resonator space is formed between the second side wall (25) and the end walls of the second resonator tube (18),

wherein the first resonator tube (16) and the second resonator tube (18) are sound-transmittingly connected to each other via a first connection opening (17) between the first side wall and the second side wall, and further wherein the first resonator tube (16) is sound-transmitting via a connection opening (15) connected to the fluid line (12) or connectable.

2. muffler device according to claim 1, wherein the first and second side wall (23, 25) have a common inner wall (24), in which the first connection opening (17) is provided.

3. Silencer device according to claim 1 or 2, wherein the first connection opening (17) in an end region of the first and / or the second resonator tube (16, 18) is arranged.

A muffler device according to any one of claims 1 to 3, wherein the connection port (15) is provided in an end portion of the first resonator tube (16).

A muffler device according to any one of claims 1 to 4, further comprising the fluid line (12).

A muffler device according to any one of claims 1 to 5, further comprising a third resonator tube having a third resonator space formed for λ / 4 attenuation of at least one sound wavelength, the third resonator tube having a third longitudinal direction, two end walls opposite each other in the third longitudinal direction, and one between the first and third The third resonator cavity is formed between the third sidewall and the end walls of the third resonator tube, wherein the third resonator tube is connected or connectable to the fluid line (12) through a second connection opening.

Silencer device according to one of claims 1 to 6, wherein the resonator arrangement (14) further comprises at least one further resonator tube (20) with a λ / 4 attenuation of at least one sound wave length formed further resonator cavity, wherein the further resonator tube (20) has a further longitudinal direction, two end walls opposite one another in the further longitudinal direction and a further side wall (27) extending between the end walls, and wherein the further resonator space is formed between the further side wall (27) and the end walls of the further resonator tube (20), the further resonator tube ( 20) and the first or second resonator tube (16, 18) by a second connection opening (19) between the other side wall (27) and the first or second side wall (23, 25) are connected to transmit sound.

8. Silencer device according to one of claims 1 to 7, wherein the first longitudinal direction parallel to a longitudinal direction of the fluid line (12) and / or a flow direction of fluid in the fluid line (12).

9. muffler device according to one of claims 1 to 8, wherein the muffler device (10) has two or more resonator arrangements, which are each connected via a connection opening with the fluid line (12) or connectable.

10. Silencer device according to one of claims 1 to 9, wherein the first longitudinal direction and the second longitudinal direction parallel to each other.

1. A muffler device according to any one of claims 1 to 10, wherein the muffler device (10) with an absorption device (40) is connected or connectable, which has a plurality of layers (54, 56).

12. A muffler device according to claim 11, wherein the absorption means (40) comprises a sealing layer (56) and an absorption layer (54).

13. Silencer device according to claim 12, wherein the sealing layer (56) is integrally connected to the absorption layer (54).

14. Silencer device according to claim 12 or 13, wherein the sealing layer (56) is connected as a lamination with the absorption layer (54).

15. Heater with a muffler device (10) according to one of claims 1 to 14.