阅读说明：本技术 用于机动车发动机的宽带消声器 (Wide-band muffler for motor vehicle engine ) 是由 R·蒂默 于 2018-12-18 设计创作，主要内容包括：本发明涉及一种宽带共振消声器,具有至少两件式的、构造成用于接收引导废气或气体的管(4.1)的壳体(2),该管通过在周向上围绕的、具有构造在其中的声学开口的管罩限定管内部空间,其中,所述管(4.1)在安装位置中由通过所述壳体形成的消声腔包围,该消声腔通过所述声学开口(4.2)与所述管内部空间处于作用连接中,并且其中,所述壳体(2)包括两个在轴向上分开的壳体半壳。为了扩宽这种宽带共振消声器的使用范围而提出,管构造为装入体(4),该装入体包括中间的管区段与两个端侧的管端部,装入体(4)构造成能装入到所述壳体的壳体半壳中,并且宽带共振消声器包括至少一个声学通道(2.6、4.5、4.6、4.13、4.15、4.20)。(The invention relates to a broadband resonance muffler having an at least two-part housing (2) designed to receive a pipe (4.1) for conducting exhaust gas or gases, which pipe delimits a pipe interior space by means of a circumferentially surrounding pipe jacket having an acoustic opening formed therein, wherein the pipe (4.1) is surrounded in the installed position by a sound-damping chamber formed by the housing, which sound-damping chamber is in operative connection with the pipe interior space via the acoustic opening (4.2), and wherein the housing (2) comprises two axially separated housing half-shells. In order to widen the range of use of such broadband resonant mufflers, it is proposed that the tube is designed as an insertion body (4) which comprises a central tube section and two end-side tube ends, that the insertion body (4) is designed to be insertable into a housing half shell of the housing, and that the broadband resonant muffler comprises at least one acoustic channel (2.6, 4.5, 4.6, 4.13, 4.15, 4.20).)

1. Broad-band muffler or broad-band resonance muffler having an at least two-part housing (2) which defines a longitudinal muffler axis and a transverse muffler axis, a pipe (4.1) which is received in the housing and which delimits a pipe interior space by means of a circumferentially surrounding pipe jacket having an acoustic opening formed therein, wherein the pipe (4.1) is surrounded in the installed position by at least one muffling chamber which is formed by the housing and is in operative connection with the pipe interior space by means of the acoustic opening (4.2), wherein the housing (2) comprises at least two housing parts, in particular two separate housing half-shells (2.1, 2.4), characterized in that,

(i) the tube (4.1) is designed as a tube insertion body (4) comprising a central tube section and two end-side tube ends,

(ii) the tube insertion body (4) is designed to be inserted into the housing part of the housing (2),

(iii) the broadband resonant silencer comprises at least one acoustic channel (2.6, 4.5, 4.6, 4.13, 4.15, 4.20),

(iv) the sound-damping chamber is divided into at least two resonance chambers by at least one insert (4.3)

(v) The at least one insertion spacer (4.3) is formed on the insertion body (4) in one piece therewith,

(vi) the insertion diaphragm (4.3) also acts as a positional securing element for the tube insertion body relative to the housing and/or,

(vii) the at least one acoustic channel comprises an inlet opening (4.11, 4.12) which is formed in the tube insert.

2. A broadband resonance muffler according to claim 1, characterised in that the acoustic channels (4.11, 4.12) extend with their longitudinal extension at least in sections in the direction of the longitudinal axis of the muffler.

3. A broadband resonant muffler according to claim 1 or 2, characterized in that the acoustic channels (4.11, 4.12) extend with their longitudinal extension at least in sections along the muffler transverse axis.

4. A broadband resonance silencer according to any one of claims 1 to 3, characterised in that the acoustic channels (4.11, 4.12) are arranged at a distance from the pipe cover in sections of their longitudinal and/or transverse extension.

5. The broadband resonance muffler according to any one of claims 1 to 4, characterized in that the acoustic channels (4.11, 4.12) are arranged on the housing inner wall in sections of their longitudinal and/or transverse extension.

6. A broadband resonant muffler according to any one of claims 1 to 5, characterized in that the at least one acoustic channel extends in the region of the edge side close to or adjacent to the surrounding housing.

7. The broadband resonant muffler according to any one of claims 1 to 6, characterized in that the acoustic channel has an end opposite the inlet opening, which end is at least substantially closed.

8. A broadband resonance muffler according to any one of claims 1 to 7, characterized in that the acoustic channels (4.11, 4.12) extend through a plurality of muffling cavities in the direction of the longitudinal axis of the muffler.

9. The broadband resonance muffler as claimed in claim 8, characterized in that the acoustic channel passes through at least one insert web (4.3) of the insert body and is preferably integrally molded on the insert web.

10. The broadband resonance muffler according to any one of claims 1 to 9, characterized in that at least one channel wall section of the acoustic channel (4.5, 4.6) is formed by a partial region of the tube insert (4) and/or a partial region of the housing (2).

11. The broadband resonant muffler according to any one of claims 1 to 10, wherein at least a partial region of the acoustic channel is a part of the enclosed body.

12. The broadband resonant muffler according to one of claims 1 to 11, characterized in that a partial region of the channel wall of the acoustic channel (4.7, 4.8) is formed on the insert and a further partial region is formed on the housing (2), wherein the two partial regions together form the respective acoustic channel.

13. A broadband resonance silencer according to any one of the preceding claims, characterised in that the at least one channel wall (4.7, 4.8) is configured circumferentially on the tube insert (4).

14. A broadband resonance muffler according to any one of the preceding claims, characterised in that the further acoustic channels (4.5, 4.6) are configured on at least one pipe connection (2.2, 2.3).

15. A broadband resonance muffler according to any one of the preceding claims, characterized in that the inlet opening (4.11, 4.12) or passage opening is larger than the remaining acoustic openings.

16. The broadband resonance muffler according to claim 15, characterized in that the cross-sections of the inlet opening (4.11, 4.12) or channel opening and the acoustic channel have substantially the same geometry, in particular the same cross-section.

17. A broadband resonant muffler according to any one of the preceding claims, characterized in that the acoustic channel (4.5, 4.6) comprises a channel partition wall (4.18, 4.19, 4.23, 4.24).

18. A broadband resonant muffler according to any one of the preceding claims, characterized by a channel partition wall (4.18, 4.19, 4.23, 4.24) which can be fitted into the acoustic channel.

19. The broadband resonant muffler according to claim 18, characterized in that the channel partition walls (2.8, 4.23, 4.24) are configured to be able to be fitted into different locations in the acoustic channels (4.5, 4.6).

20. Engine or internal combustion engine turbocharger with a broadband resonant muffler according to any one of claims 1 to 18 in an air guiding system, in particular an air intake system.

Technical Field

The invention relates to a broadband resonance muffler, referred to in the following as a broadband muffler for simplicity, which is installed in particular in internal combustion engines, particularly preferably motor vehicle engines, having an at least two-part housing, which comprises in particular a housing lower shell and a housing upper shell. The housing has a longitudinal muffler axis and a transverse muffler axis and receives a pipe which conducts exhaust gas or gas and which delimits an interior space of the pipe by a circumferentially surrounding pipe jacket which has an acoustic opening formed therein. The tube forming the air channel is surrounded in the installed position by at least one sound-damping or resonance chamber formed by the housing, which is operatively connected to the tube interior space via the acoustic opening, and wherein the housing comprises or is formed by two axially separated housing parts.

Background

Vehicles that are becoming lighter and lighter also present great challenges to engine technology, in particular to acoustically intensive systems thereof, in particular to air intake systems of engines or turbochargers, as well. In order to minimize the development of noise in air intake systems, resonators are frequently used today. The resonator is usually composed of one or more chambers which are connected gas-permeable to the inlet line for air. In order to achieve effective noise isolation and to cover a wide resonance spectrum, a plurality of resonators of different designs can be provided, which compensate for different resonance ranges.

Since components of air intake systems are nowadays often manufactured in injection molding processes, developers are increasingly faced with the following problems: how to optimally arrange a plurality of resonant cavities in a narrow structural space.

Existing broadband resonant mufflers are primarily constructed as multi-piece systems or assemblies that are welded together and that, for example, comprise an outer housing part into which a pipe section with an opening is welded. The complexity of the design and the connection technology is evident in all existing solutions, so that these systems often have to be welded in multiple parts. This is relatively complex in manufacturing technology and is also prone to errors. The complexity achieved by the prior art increases the manufacturing effort and thus the costs. Broadband resonant mufflers with resonant cavities or resonators divided by a plurality of dividing walls require a relatively large amount of structural space and sometimes have only a small effective resonant volume. Multiple welding processes are typically required in these multi-piece designs. The nested design requires an assembly step interposed between the two components during the welding process, which is likewise disadvantageous with regard to the production costs. Furthermore, it is difficult to design different types and designs of resonators in a broadband resonant silencer and to provide several variants simultaneously in a narrow installation space.

The housing with the pipe arranged therein in the installed position forms a sound damping system in the intermediate space between the inner pipe and the outer housing, which sound damping system extends along the system longitudinal axis or the longitudinal axis of the sound damper, but these axes do not necessarily have to run along a straight line, but can also be curved or bent. The individual sound-damping chambers or resonance chambers are usually formed radially spaced apart from one another from the tube in the longitudinal direction of the sound absorber of the overall system or sound-damping system formed in this way.

Such resonators are known, for example, from DE 102010022780B 4 and EP 1176355 a 2.

Disclosure of Invention

Technical problem (task)

Starting from the initially mentioned prior art and the disadvantages associated therewith, the object of the invention is therefore to at least partially avoid the indicated disadvantages and to provide a noise muffler or a broadband resonance muffler, in particular for an internal combustion engine, which makes it possible to achieve or provide a particularly wide application spectrum for a plurality of frequencies, which noise muffler or broadband resonance muffler requires as little space requirements as possible even in complex geometries and can be produced simply.

This object is achieved by the features of the independent claims: preferred, but not mandatory, embodiments are specified in the dependent claims.

In the simplest embodiment, the tube is designed as a tube insert, i.e. as a unit, preferably of one-piece design, which comprises a tube or a tube connection or a tube element, which can be inserted into the housing part in the installed position, wherein the tube comprises an acoustic opening in the tube cover, and wherein the tube insert further comprises an end-side connection, a pipe or the like for connecting to an adjoining tube, and at least one acoustic channel, at least one or each of the acoustic channels respectively having at least one or exactly one channel inlet opening, through which a fluid or gas flows into the acoustic channel and is closed on the end side in order to thereby function, for example, as a λ (L ambda)/4 channel or a λ/2 channel.

The housing preferably comprises two parts, namely a first housing half shell, which is in particular designed as a housing lower shell, and a second housing half shell, which is in particular designed as a housing upper shell, which can be placed onto the first housing half shell.

According to an alternative, the sound-damping chamber is divided into at least two resonance chambers by at least one insertion diaphragm, wherein the at least one insertion diaphragm is formed on the insertion body in one piece with the insertion body, and wherein the insertion diaphragm also acts as a position fastener. According to a second alternative, which is particularly preferably implemented in combination with the first alternative, the at least one acoustic channel comprises an inlet opening which opens directly into the tube. The channel inlet, which is fitted into the septum and/or at least the acoustic channel, is therefore likewise part of the preferably one-piece tube fitting body. Preferably, at least a partial region of the at least one or more acoustic channels is also part of the preferably one-piece tube insert. Particularly preferably, at least a partial region of the at least one or more acoustic channels is part of a preferably one-piece tube insert and/or one or more complete acoustic channels is part of a preferably one-piece tube insert. If, in relation to a given acoustic channel, only one partial region is part of the preferably one-piece tube insert, the further partial region of the respective acoustic channel for completing the acoustic channel is preferably formed by the housing or a housing part. The respective "partial regions" of the acoustic channel are in this case respectively wall regions of the acoustic channel, including wall regions which close the channel end opposite the channel entry opening. The partial regions of the wall of the acoustic channel which are formed by the tube insert and the housing part on the other hand are preferably welded to one another. The broadband resonant silencer is thereby particularly simple to construct in terms of design and can be produced particularly simply by inserting the tube insert into one of the housing parts and closing or joining the preferably 2-part housing. At the same time, the broadband resonant silencer has an improved sound damping, since it comprises a broadband resonator and at the same time an additional and particularly effective sound damping acoustic channel for specific frequencies, wherein the two sound damping functions are integrated on the tubular insert.

The invention therefore provides the following solution for the problem: in addition to the broadband sound damping, the compensation of the at least one or more acoustic channels for at least one or different frequencies by means of different lengths and different geometries is arranged in a particularly small structural space by means of the at least one or more sound damping chambers in order to thus compensate or intercept (affangen) at least one or different additional frequency ranges in different frequency-dependent acoustic channels, wherein the correct geometry of the acoustic channel or acoustic channels, for example in terms of length and diameter, can be determined by the person skilled in the art in a manner adapted to the frequency to be compensated. In addition to broadband noise damping, noise in an arbitrarily large frequency range can therefore be compensated for by a corresponding configuration of the acoustic channel or channels. The preferred frequency range lies between 200 and 800Hz, but wherein there are certainly further frequency ranges lying within the possible range. Thus, for example, a specific acoustic channel for the range of 200Hz, an acoustic channel for the frequency range of 300Hz, which is connected to or separate from this acoustic channel, and a further acoustic channel for the frequency range of 400 to 600Hz or also up to 800Hz can be formed. According to the invention, when a plurality of acoustic channels are provided, said acoustic channels have different lengths and geometries, in order to be able to intercept or compensate different frequency ranges.

The muffling chamber can be divided by at least one insert web into a plurality of muffling chambers or subcavities, which are arranged one behind the other, for example, extending along the longitudinal axis of the muffler. The respective insertion webs therefore act as partition walls in order to separate adjacent sound-damping chambers from one another. The muffling chambers are each realized at least substantially in a gas-tight manner by the division of the respective insertion webs, wherein small leakage rates with respect to the gas exchange between adjacent muffling chambers are acceptable, as long as the muffling function of the respective muffling chamber is not significantly impaired. The corresponding insertion diaphragm is preferably fixed to the tube insertion body or is particularly preferably integrally molded on the tube insertion body.

The broadband resonant silencer designed as an air guide system therefore has two main components, namely an outer or receiving housing and a tube insert that can be inserted into the housing. The tube insert includes a tube that guides fluid or air from the muffler inlet side to the muffler outlet side. Particularly preferably, a broadband resonance silencer is provided, which comprises a further at least one acoustic channel and a feed spacer for separating a resonance chamber, which is formed exactly by the housing shell and the tube feed, whereby the broadband resonance silencer can be produced particularly simply. Furthermore, the broadband resonant sound absorber can thus be adapted to different requirements of sound absorption, for example to different designs of turbochargers, in a given configuration of the housing by different arrangements of the insertion spacers and/or different configurations of the at least one or more acoustic channels.

In general, within the framework of the invention, the housing can therefore be composed of more than two housing part shells, wherein for reasons of clarity the term "housing half shell" is also used instead of the term "housing part shell". In particular, however, the term "housing half shell" accordingly relates to a two-part housing having two housing half shells.

The two-part housing is thus preferably of shell-shaped design and preferably comprises a lower housing shell and an upper housing shell, which can be connected to one another in the installed position at a separation point or separation plane, which preferably extends along the longitudinal axis of the muffler, for example, can be welded.

The tube insert with the at least one insert web extending in its longitudinal extension transversely to the longitudinal axis of the muffler and the at least one partial region of the at least one or more acoustic channels is preferably of one-piece design, which is particularly advantageous in terms of production technology and for handling during assembly of the broadband resonant muffler. If appropriate, the tube insert can also be designed in multiple parts, as long as the individual partial regions of the same tube insert are combined during the construction of the assembly, so that the tube insert can be handled as a single component and inserted into the housing shell, so that a broadband resonance silencer can then be produced in a split-type fashion with the second housing shell.

Preferably, the housing parts or housing shells are produced in an injection molding process and are connected to one another in a sealing or gas-tight manner by means of welding. The tube insert, which can be inserted and received in the housing, has an air channel or a tube and is open at both ends and has the cross section required for the medium to flow through.

According to the invention, the volume formed between the housing and the pipe or the air channel or the housing interior forms a broadband resonator, which can also be designed as a "helmholtz resonator", which can comprise a plurality of partial chambers or resonant chambers, which are divided by a filling web or a filling wall arranged on the filling body, in order to compensate or cover a frequency spectrum which is as broad as possible. The sealing between the resonant cavities, which are preferably formed one after the other in the longitudinal direction, required for the function can be achieved, for example, by a tongue and groove connection. Preferably, at least one groove is formed on the housing interior, into which the at least one insertion diaphragm, which acts as a partition between the resonant cavities, can be inserted.

The at least one acoustic channel forms a further tubular resonant volume, which can be configured, for example, as a quarter-lambda resonator.

The acoustic channel is preferably formed at least partially or completely by at least one channel wall formed on the outside of the tube, which is preferably part of the tube insert. The acoustic channel preferably accordingly emanates directly from the tube.

Preferably, the channel walls of the acoustic channel are arranged on the outside of the tube insert and are preferably integrally molded on the tube insert.

The channel wall can extend in the longitudinal direction of the muffler with respect to the channel longitudinal direction, whereby the channel length can be varied over a large range and can thus cover individual frequencies of a large frequency spectrum. The channel walls can also extend transversely to the longitudinal direction of the muffler with respect to the channel longitudinal direction, whereby the geometry of the channel extension can be varied over a larger area. Particularly preferably, the at least one acoustic channel has a section extending with its longitudinal extension in the direction of the longitudinal axis of the muffler and a section extending with its longitudinal extension along the transverse axis of the muffler, so that the channel length and thus the frequency sensed by the channel can be selected from a wide frequency range and the muffler can be adapted to different requirements.

In this case, it is also possible for the acoustic channel to extend at least in sections at a distance from the pipe cap, forming an intermediate space between the channel and the pipe. The geometry of the longitudinal extension of the channel can thereby be selected virtually freely and the channel length can be varied over a wide range and adapted to the respective requirements.

The tube of the tube insert has a plurality of acoustic openings, wherein a plurality of acoustic openings can be provided in each case on the tube with respect to one sound-damping chamber. The muffling chambers are each formed between the tube and the housing, adjacent muffling chambers being separated from one another by an interposed diaphragm. In each case, a plurality of acoustic openings distributed around the circumference of the tube and/or a plurality of (preferably more than two) acoustic openings arranged at a distance from one another in the longitudinal direction of the tube are provided on the tube. The number and/or size, i.e. the length, width and diameter, of the acoustic openings are individually adjusted for each cavity according to the desired frequency range to be muffled.

In order to utilize the entire volume of the anechoic chamber, the at least one acoustic channel can also extend over a plurality of resonant chambers, wherein the acoustic channel can have any desired geometry.

Preferably, the at least one acoustic channel extends along the longitudinal axis of the muffler and/or along the transverse axis of the muffler, in particular in the edge-side region, close to or adjacent to the surrounding housing. Preferably, the acoustic channel runs circumferentially along the edge of the tube insert, i.e. is formed essentially at a distance from the edge contour of the tube insert. Within the framework of the invention, however, it is basically the case that the at least one acoustic channel has any arbitrary geometry for the respective application, for example a worm or spiral geometry for particularly long acoustic channels.

In a preferred embodiment, the acoustic duct comprises at least one duct wall, duct rib or the like, which is formed radially from the tube insert, in particular integrally molded on the tube insert, and which, in the installed position, can be connected to an adjacent housing part for forming the acoustic duct, in particular by means of a tight connection for closing the acoustic duct. Preferably, the connection is made by means of gluing, welding or the like. In this way, the tube insert only has to be inserted into one housing shell with the partition wall positioned and then closed by the second housing shell. The tube insert can thus be produced particularly simply, in particular also as an injection-molded component, in particular also as a one-piece component. The channel wall can also be fitted on the inside into a correspondingly configured receiving groove on the inside of the housing.

Drawings

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as "above," "below," "front," "rear," etc., is used with reference to the orientation of the figures. Because components of the embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. Of course, additional embodiments are utilized and structural or logical changes may be made without changing the scope of the present invention. The following detailed description is to be taken in a limiting sense.

Within the framework of this description, the concepts "connected", "coupled", and "integrated" are used to describe direct and indirect connections, direct or indirect couplings, and direct or indirect integrations. In the drawings, the same or similar elements are provided with the same reference numerals, as long as they are appropriate.

The reference mark line is a line connecting the reference mark and the relevant portion. Whereas the arrow of the non-contact portion relates to the whole unit to which said arrow points. Furthermore, the drawings are not necessarily to scale. To clarify the details, the determined area can be shown too large. Moreover, the drawings may be very simplified and do not contain every detail that may be present in an actual implementation. The concepts "above" and "below" relate to the display in the drawings. The figures show:

FIG. 1 is an isometric exploded view in longitudinal view of a broadband resonant muffler according to the present invention;

FIG. 2 is an isometric top view of the broadband resonant muffler with the upper housing half removed;

FIG. 3 is a longitudinal section through the broadband resonant muffler according to FIG. 2;

FIG. 4 is an enlarged view of the entrance end of the broadband resonant muffler on the right side of FIGS. 1-3;

FIG. 5 is an isometric end side cross section of the entry end of the broadband resonant muffler;

fig. 6 shows the broadband resonant silencer according to fig. 1 with the upper half shell removed in the installed position, in order to clarify the main acoustic channel;

fig. 7 is a diagram according to fig. 6 with a partition wall fitted into the main acoustic channel; and

fig. 8 shows an alternative embodiment of a broadband resonant muffler with acoustic channels configured in different planes.

Embodiments include that the channel walls can additionally be welded for tight closure.

A plurality of channel walls running in particular parallel next to one another can be used to provide a corresponding plurality of acoustic or resonant channels in a given space.

The at least one or the respective acoustic or resonant channel has at least one or exactly one channel opening or channel entry opening, respectively, through which an air flow or sound waves can enter from the tube into the respective channel and are closed off at the end face, respectively, at the end opposite the channel inlet.

Thus, the different lengths and different geometries of these acoustic channels allow compensation of different frequency spectra. The configuration of the channel opening as a slot has proven particularly suitable, wherein in principle the inlet opening corresponds to the cross section of the acoustic channel.

In general, the cross-section and the length of the acoustic channel are adapted to the frequency to be compensated. The acoustic channels can be configured, for example, as lambda/4 (quarter lambda) channels or resonators or as lambda/2 (half lambda) channels or resonators. In the λ/4 channel, the acoustic channel has 1/4 of the wavelength to be damped, so that when the sound waves pass and return towards the channel end λ/4 results and the relevant waves are therefore attenuated in the pipe by the superposition of the waves. Because the acoustic frequencies covered depend on the respective lengths of the acoustic channels, the acoustic channels formed can have different lengths.

Preferably, the outer acoustic channel extending closer to the housing wall is constructed larger, i.e. has a greater length, since it is relatively far from the tube of the receiving body.