CN113628603A

CN113628603A - Combined silencer

Info

Publication number: CN113628603A
Application number: CN202111004073.4A
Authority: CN
Inventors: 王贡献; 胡竟争; 向磊; 史蒙飞
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2021-11-09
Anticipated expiration: 2041-08-30
Also published as: CN113628603B

Abstract

The invention relates to a combined muffler, which comprises a plurality of muffling units, wherein each muffling unit comprises a shell, a muffling assembly and a plurality of connecting blocks, each shell is a regular polyhedron, the surface of each shell is provided with a ventilation hole, each muffling assembly is arranged inside each shell, each connecting block is arranged on each corner of each shell, the muffling units are arranged in a combined mode along the normal direction of the surface of each shell, the ventilation holes in opposite directions in two adjacent muffling units are communicated to form a ventilation channel, gaps between the inner muffling assemblies and the muffling units are used for muffling, and the connecting blocks between the two adjacent shells are connected in a one-to-one correspondence mode. The shell is a regular polyhedron, and each edge is provided with the connecting block, so that any surface of the shell can be connected with other silencing units, and a plurality of silencing units can form various shapes under the condition of ensuring that the ventilation holes of two adjacent silencing units are communicated.

Description

Combined silencer

Technical Field

The invention relates to the technical field of silencers, in particular to a combined silencer.

Background

The noise is a sound with irregular and disorderly frequency and intensity variation of sound waves. The noise may come from any scene of an airplane, an automobile, a factory, a construction site, daily life, and the like. It is common to add muffling devices to large power plants or to place muffling barriers around the environment in which they operate to reduce the noise impact on nearby personnel.

Conventional muffling devices (also known as muffling devices, muffling apparatuses, mufflers, and the like) are roughly classified into resistive mufflers and reactive mufflers according to their muffling principles and structures. The reactive muffler realizes noise elimination and reduction by using the change of the muffler structure, and has simple structure and convenient manufacture. However, for the noise elimination of lower frequencies, the silencer is generally required to have a larger volume, and the noise elimination frequency band of the silencer is narrow, so that the noise can be reduced only for the noise of certain specific frequencies. The resistive muffler is mainly composed of a metal pore plate filled with resistive sound absorption materials such as glass wool and the like, and sound energy is converted into heat energy to be dissipated due to friction when sound waves are transmitted in the resistive sound absorption materials, so that the purpose of sound elimination is achieved. The resistive muffler has a complex structure, but has the advantages of good medium-low frequency muffling performance and wide medium-low frequency muffling frequency band.

In order to combine the advantages of the two muffling devices, an impedance compound muffler also exists. For example, chinese patent CN205532784U discloses an impedance composite type automobile silencer, which uses a damping chamber to suppress the vibration of an air inlet pipe to control the resonance generated by air, and uses the sound absorption effect of petroleum fiber cotton to make the noise propagated along the channel be absorbed and attenuated gradually. And the phenomena of reflection, interference and the like of sound waves in the silencing chamber and the flow reduction buffer chamber are utilized, so that the aim of silencing is fulfilled, good silencing effects in low, medium and high frequency ranges are realized, and the silencer has the advantages of a resistive silencer and a reactive silencer.

However, in the conventional resistive muffler, the reactive muffler or the impedance type composite muffler disclosed in the above patent, specifications such as a processing frequency domain, an external dimension and the like are fixed at the time of shipment, a use scene is single, and a user cannot freely adjust the shape of the muffler according to a field condition requiring muffling, and cannot be flexibly applied to different occasions.

Disclosure of Invention

In view of the above, there is a need to provide a combined muffler to solve the problem that the overall size of the existing muffler cannot be changed arbitrarily.

The present invention provides a combined muffler comprising:

the noise reduction unit comprises a shell, a noise reduction assembly and a plurality of connecting blocks, the shell is a regular polyhedron, and the centers of at least two surfaces of the shell are provided with vent holes; the silencing assembly is arranged in the shell and is provided with an airflow channel for silencing, and the airflow channel is communicated with all the vent holes; the connecting blocks are respectively arranged on the edges and corners of the shell;

the multiple silencing units are combined and arranged along the normal direction of the surface of the shell, wherein the opposite vent holes in two adjacent silencing units are communicated to form a vent channel; the connecting blocks between two adjacent shells are connected in a one-to-one correspondence manner.

Preferably, the shell further comprises at least two contact blocks, the contact blocks are arranged on the outer surface of the shell in a one-to-one correspondence mode with the vent holes respectively, the vent holes penetrate through the contact blocks, and two opposite contact blocks in two adjacent silencing units are in butt joint.

Preferably, the noise reduction device further comprises a plurality of assembly parts, the shell is a regular hexahedron, three connecting holes are formed in the connecting blocks, the three connecting holes are respectively parallel to three orthogonal edges in the shell, two connecting holes in two corresponding connecting blocks between two adjacent noise reduction units are coaxially arranged to form a connecting channel, and the assembly parts are inserted into the connecting channel;

the connecting block still includes three locating surface, and the axis of three connecting hole of three locating surface perpendicular to respectively, and all face towards the one side that deviates from the shell, and the distance of locating surface to the side of the shell rather than parallel equals the distance that the one side that the contact block deviates from the shell reaches the side of its place shell, two locating surface looks butt in two corresponding connecting blocks in opposite directions.

Preferably, the three connecting holes respectively penetrate through the center of the three positioning surfaces, and the axes of the three connecting holes are respectively superposed with the edges of the three shells on which the corresponding connecting blocks are positioned; an inner chamfer sunken towards the inner side of the shell is formed on the edge of the shell, and the radius of the inner chamfer is larger than or equal to that of the connecting hole; the assembly is a bolt.

Preferably, the acoustic abatement assembly comprises a reactive or resistive hybrid.

Preferably, resistance amortization subassembly includes hollow block, and hollow block sets up in the shell, and the inner space of hollow block is first amortization cavity, and first amortization cavity constitutes airflow channel, first amortization cavity and ventilation hole intercommunication, and the area in ventilation hole is less than the area of the cross section of first amortization cavity along the axis direction in ventilation hole.

Preferably, the resistive silencer comprises a silencing block, first silencing holes which are arranged in an array mode are formed in the silencing block along three orthogonal directions, the first silencing holes in different directions are communicated, the first silencing holes are further communicated with the ventilation holes, and a plurality of first silencing holes which are communicated form an airflow channel.

Preferably, the impedance composite ventilation device comprises a second silencing cavity and a plurality of silencing pipes, wherein the second silencing cavity is formed by surrounding the inner wall of the shell, the two ends of each silencing pipe are respectively connected with the two ventilation holes, the pipe diameters of the two ends of each silencing pipe are larger than the hole diameters of the ventilation holes, a plurality of second silencing holes are formed in each silencing pipe, and the silencing pipes are mutually converged and communicated to form an airflow channel.

Preferably, a cavity is formed in the shell, the silencing assembly is arranged in the cavity, and the inner wall of the cavity is covered with a sound absorption material; regular grooves are formed in the outer surface of the shell, and sound absorption materials are covered on the outer surface of the shell.

Preferably, the air conditioner further comprises a plurality of sealing covers, wherein the sealing covers are detachably arranged on the air vents and used for sealing the air vents.

The invention provides a combined silencer, which connects two silencing units by connecting blocks on different shells together. Because of the shell is regular polyhedron and all has the connecting block on every edges and corners, make like this arbitrary one side on the shell all can be connected with other amortization unit, under the condition of the ventilation hole intercommunication of guaranteeing two adjacent amortization units, multiple shape can be constituteed to a plurality of amortization units. The ventilation hole among the amortization unit that is connected is linked together, and the amortization subassembly among every amortization unit also communicates with the ventilation hole, when having the air current to pass through like this, partial air current can flow through the air current passageway of inside amortization subassembly, realizes at the inside pressure loss of amortization unit, leaks in the gap of two ventilation holes that are linked together can be followed to partial air current simultaneously, walks in the clearance of a plurality of amortization units, forms the pressure loss outside the shell, just so realized the noise cancelling effect. Compared with the existing silencer, the combined silencer can be flexibly assembled into different shapes according to different conditions of an application field, and is particularly suitable for various narrow and irregular spaces. In addition, different numbers of silencing units can be flexibly assembled according to different required silencing effects, different types of silencing components are selected and matched, so that silencing of specific frequency domains and specific volume is achieved, a user is allowed to have no need to purchase silencers of various different models, types and specifications, and only one device can be used for dealing with most working conditions, so that good economic benefits are brought.

Drawings

FIG. 1 is a schematic structural diagram of a muffler unit in an embodiment of the combined muffler of the present invention;

FIG. 2 is a first schematic structural diagram of an embodiment of a combined muffler of the present invention;

FIG. 3 is a second schematic diagram of an embodiment of a combined muffler;

FIG. 4 is a third structural schematic view of an embodiment of the combined muffler of the present invention;

FIG. 5 is a fourth structural schematic view of an embodiment of the combined muffler of the present invention;

FIG. 6 is a schematic structural diagram of a muffler unit including a reactive muffler in an embodiment of the combined muffler of the present invention;

FIG. 7 is a schematic structural diagram of a muffler unit including a resistive muffler device according to an embodiment of the combined muffler of the present invention;

FIG. 8 is a schematic structural diagram of a muffler unit including an impedance compounding muffler device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a sealing cap in an embodiment of the combined muffler of the present invention.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.

Referring to fig. 1 to 5, the present invention provides an embodiment of a combined muffler, in which the cover combined muffler includes a plurality of muffler units 1, and each muffler unit 1 further includes a housing 11, a muffler device 12, and a plurality of connecting blocks 13. The shell 11 is a regular polyhedron, at least two surfaces of the shell 11 are provided with vent holes 14, and the vent holes 14 are positioned in the center of the surface of the shell 11. Silencing device 12 sets up inside shell 11, and it has the airflow channel who is used for the amortization, and airflow channel all communicates with all ventilation holes 14, and when the air current flowed into silencing device 12 from ventilation holes 14, silencing device 12 can cause loss such as pressure or frictional force to the air current, realizes the amortization. The muffler device 12 may be of an existing muffler structure or may be designed by itself, and the type of the muffler device 12 may be resistive muffler or resistive muffler, or a combination thereof, which will be described in detail later.

The connecting block 13 is arranged on the corner of the shell 11, and the two silencing units 1 are connected through the connecting block 13. Specifically, a plurality of sound deadening units 1 are arranged in combination in the normal direction of the surface of the housing 11, wherein the facing vent holes 14 in adjacent two sound deadening units 1 communicate to constitute a vent passage. The connecting blocks 13 between two adjacent housings 11 are connected in a one-to-one correspondence manner, the connecting blocks 13 may be magnets, or may have a multi-angle snap structure matching the surface of the housing 11, and the two connecting blocks 13 are connected by snap-fit, and a preferred embodiment of the connecting blocks 13 will be given later. It should be noted that the thickness of the mounting block should be controlled within a certain range, so that when the two silencing units 1 are connected, the gap between the two shells 11 is not too large, and the gap plays a role of rubbing the air flow.

The invention provides a combined silencer, which connects two silencing units 1 by connecting blocks 13 on different shells 11. Because of shell 11 is regular polyhedron and all has connecting block 13 on every edges and corners, make arbitrary one side on the shell 11 all be connected with other amortization unit 1 like this, under the condition of the ventilation hole 14 intercommunication of guaranteeing two adjacent amortization unit 1, multiple shape can be constituteed to a plurality of amortization unit 1. The vent holes 14 in the connected silencing units 1 are communicated, and the silencing device 12 in each silencing unit 1 is also communicated with the vent holes 14, so that when airflow passes through, part of the airflow can flow through the inner silencing device 12 to realize pressure loss in the silencing unit 1, and meanwhile, part of the airflow can leak from the gap of the two communicated vent holes 14 and can swim in the gaps of the plurality of silencing units 1 to form pressure loss outside the shell 11, so that the silencing effect is realized.

Referring to fig. 1 again, the present invention also provides a preferred embodiment, the housing 11 of each sound-deadening unit 1 of the combined muffler further includes at least two contact blocks 15, the contact blocks 15 are respectively disposed on the outer surface of the housing 11 in one-to-one correspondence with the vent holes 14, that is, the number of the contact blocks 15 is the same as that of the vent holes 14. The vent hole 14 penetrates the contact block 15, and two contact blocks 15 facing each other in two adjacent noise reduction units 1 are in contact with each other. The contact blocks 15 are tightly fitted to enhance the communication between the two vent holes 14, so that most of the air flow can traverse the muffling devices 12 in the multiple muffling units 1 to achieve the best muffling effect, and only a small part of the air flow can directly leak from the two abutting contact blocks 15, and the leaked air flow can still form external pressure loss through the gap between the muffling units 1.

Referring again to fig. 1, as a preferred embodiment, the combined muffler of the present embodiment further includes a plurality of assembly members 2. Meanwhile, the shell 11 is a regular hexahedron with the side length of 200mm, the number of the connecting blocks 13 is eight, three connecting holes 16 with the radius of 5mm are formed in each connecting block 13, the three connecting holes 16 are respectively parallel to three orthogonal edges in the shell 11, the two connecting holes 16 in the two corresponding connecting blocks 13 between the two adjacent silencing units 1 are coaxially arranged to form a connecting channel, and the assembly parts 2 are inserted into the connecting channel and connected with the connecting blocks 13 together. Because the connecting holes 16 are respectively vertical to three orthogonal side surfaces on the shell 11, the two silencing units 1 can be connected along three directions by inserting the assembly parts 2 into the connecting holes 16, so that the assembly form of the combined silencer is flexible and changeable. The assembly member 2 may be a rod-shaped workpiece such as a bolt, a screw, a bolt and a nut, which may be inserted into only two connecting blocks 13, i.e., two silencing units 1 may be connected at a time, or may have a long length, and pass through a plurality of connecting blocks 13 at a time, so as to connect a plurality of silencing units 1 together in one direction.

In addition, the connecting block 13 in the present embodiment can be regarded as a cube with a side length of 20mm, which is respectively located on the corner of the housing 11 and has an overlap of 10mm with the housing 11. Three side surfaces of the connecting block 13, which are away from the housing 11, are three positioning surfaces, and the three positioning surfaces are respectively perpendicular to the axes of the three connecting holes 16. Meanwhile, the diameter of the vent hole 14 is 60mm in this embodiment, and the contact block 15 is a cylinder having a diameter of 120mm and a height of 10mm, and its axis coincides with the axis of the vent hole 14. Thus, the distance from the positioning surface to the side of the housing 11 parallel thereto is equal to the distance from the side of the contact block 15 facing away from the housing 11 to the side of the housing 11 on which it is located, each 10 mm. When the two silencing units 1 are connected, the positioning surfaces on the two connecting blocks 13 are abutted, so that a gap of 20mm is reserved between the two shells 11, and the two contact blocks 15 can be just contacted to form a channel which is relatively tightly communicated.

It should be understood that all the above dimensional information is only a preferred embodiment, and in practical applications, the dimensions of the structures such as the housing 11, the connecting block 13, the vent hole 14, etc. can be flexibly adjusted according to needs, and the invention is not limited thereto. In addition, as an example, in the present embodiment, four vent holes 14 are formed in the housing 11 of one silencing unit 1, and the four vent holes 14 are respectively located on four side surfaces of the housing 11 that are sequentially connected end to end and are in an annular shape, so that in practical implementation, the number of the vent holes 14 can be adjusted to any number of two to six according to different requirements on the shape flexibility of the combined silencer, and the vent holes are formed on any side surface of the housing 11.

Referring to fig. 1 again, as a preferred embodiment, three connecting holes 16 in this embodiment respectively penetrate through the centers of the three positioning surfaces, the axes of the three connecting holes 16 respectively coincide with the edges of the three housings 11 on which the corresponding connecting blocks 13 are located, and simultaneously, an inner chamfer 17 recessed toward the inner side of the housing 11 is formed on each of twelve edges of the housing 11, the radius of the inner chamfer 17 is greater than or equal to the radius of the connecting hole 16, and the assembly 2 in this embodiment is a bolt. Interior chamfer 17 is built-up member 2, and the bolt provides comparatively convenient installation space promptly, and when still having increased a plurality of amortization unit 1 and connecting simultaneously, the unsmooth degree in gap between the amortization unit 1 increases the flow area of air current to reach the purpose that increases air current friction loss.

Referring to fig. 2 to 5, in the present embodiment, the plurality of silencing units 1 are assembled in different ways to form various shapes to adapt to different working occasions, and the combined silencers in fig. 2 and 3, i.e., fig. 4, are respectively I, T, L-shaped, and can be applied to silencing in narrow and curved passages. The combined silencer in fig. 5 is block-shaped, and is suitable for occasions with small space limitation and high requirement on silencing effect, such as an engine exhaust port of an automobile.

With reference to fig. 6 to 8, as a preferred embodiment, the silencer device 12 in this embodiment includes one, two, or three of the reactive silencer component 121, the resistive silencer component 122, or the impedance composite silencer component 123. The reactive noise reduction structure is simple and convenient to manufacture, but can only reduce noise at certain specific frequencies. The resistive noise elimination is realized by converting sound energy into heat energy due to friction and dissipating the heat energy when sound waves are transmitted in a resistive sound absorption material, so that the purpose of noise elimination is achieved. The impedance composite noise reduction has the advantages of both, but the structure is more complicated.

In practical implementation, the three types of muffling devices can be combined at will to form one muffling device 12, that is, a single reactive muffling component 121 and a resistive muffling component 122 can be arranged in one housing 11, or the reactive muffling component 121 or the resistive muffling component 122 can be arranged at the same time and communicated with each other, or one reactive muffling component 121 is communicated with another on the basis of the impedance composite muffling component 123, so as to achieve a special effect. Each of the muffler units 1 in the present embodiment includes only one of three different types of muffling devices, each of the housings 11 includes only one type of muffler device 12, and the plurality of muffler units 1 are also classified into three types according to the type of the muffler device 12 inside. Therefore, different numbers of silencing units 1 can be flexibly assembled according to different required silencing effects, and different types of silencing devices 12 are selected and matched to achieve silencing in a specific frequency domain and a specific volume.

Referring to fig. 6, as a preferred embodiment, the reactive noise elimination assembly 121 includes a hollow block 1211, an inner space of the hollow block 1211 is a first noise elimination cavity 1212, the hollow block is disposed in the housing 11, and the first noise elimination cavity 1212 is communicated with the vent 14, and the first noise elimination cavity 1212 forms a noise elimination channel of the reactive noise elimination assembly 121. The area of the inner wall of the first sound-deadening cavity 1212, where the first sound-deadening cavity 1212 communicates with the vent hole, is larger than the vent hole 14 connected thereto, that is, the area of the vent hole 14 is smaller than the area of the cross section of the first sound-deadening cavity 1212 in the axial direction of the vent hole 14, where the cross section is made abrupt. The first sound-attenuating cavity in this embodiment is a cylindrical expanding cavity 160mm long and 160mm in diameter formed by the inner wall of the housing 11 and serving to attenuate both incoming and outgoing sound waves. It is understood that in practice, the first sound-deadening cavity 1212 may be directly surrounded by the inner wall of the housing 11, i.e., the reactive sound-deadening assembly 121 has no entity but only an expanded space.

The principle of the reactive silencing is that the medium density is changed by utilizing the sudden change of the section of the sound wave channel, so that the acoustic impedance is suddenly changed, an abstract interface is formed, a part of sound waves in the pipe are reflected back to a sound source from the interface, the phase difference between the sound waves transmitted forwards and the reflected sound waves is 180 degrees, the frequency of the sound waves is equal to that of the sound waves transmitted back, the directions of the sound waves are opposite, and then the reflected sound waves counteract a part of the sound waves transmitted forwards, so that the aim of silencing is achieved. The propagation loss of the reactive muffler assembly 121 to the gas flow in this embodiment is:

wherein the content of the first and second substances,

the ratio of the sectional area of the expansion cavity to the sectional area of the inlet and outlet pipes is shown, s represents the main sectional pipe area, l represents the length of the expansion cavity, and n represents the wave number of sound waves.

It is understood that the shape and size of the first sound-deadening cavity can be adjusted arbitrarily according to the actual needs, such as any one or combination of a cylindrical shape, a spherical shape, a rectangular parallelepiped shape and a conical shape.

Referring to fig. 7, as a preferred embodiment, the resistive muffler assembly 122 in this embodiment includes a muffler block 1221, the muffler block 1221 is provided with first muffling holes 1222 arranged in an array along three orthogonal directions, the first muffling holes 1222 are 164mm long and have a cross-sectional diameter of 20 mm. In this embodiment, the muffling block 1221 is directly formed inside the housing 11, the three directional first muffling holes 1222 extend in a direction perpendicular to the three sides of the housing 11, the three directional first muffling holes 1222 meet and communicate with each other to form a honeycomb structure, and the honeycomb first muffling holes 1222 form an air flow passage of the resistive muffling device. The ends of the first muffling holes 1222 located at the middle are in turn communicated with the vent holes 14, respectively. When sound waves pass through the first sound-deadening hole 1222, the sound waves contact the sound-deadening block 1221 to excite the air molecules in the first sound-deadening hole 1222 to vibrate, and a part of sound energy is converted into heat energy by the resistance and viscous force of the molecules to be dissipated, so that resistive sound-deadening is formed. The silencing units are connected with each other, so that the length of an airflow circulation path is increased, and the contact area between air and the silencing units is increased, so that the silencing effect is improved. Similarly, the resistive muffler assembly 122 may not have the honeycomb structure in the present embodiment, and may have any one of a zigzag plate type and a labyrinth type, or a combination of the above structures.

Referring to fig. 8, as a preferred embodiment, the impedance compound ventilation device in this embodiment includes a second silencing cavity 1231 and a plurality of silencing tubes 1232 connected to each other, wherein the second silencing cavity 1231 is formed by the inner wall of the housing 11, and is a cube with a side length of 180 mm. The two ends of the silencing tube 1232 are respectively connected to the two vent holes 14, and the pipe diameters of the two ends of the silencing tube 1232 are larger than the hole diameters of the vent holes 14 and are 48 mm. In this embodiment, one impedance complex ventilation device includes two muffling pipes 1232, and the two muffling pipes 1232 intersect and form a cross shape to form an airflow channel of the impedance complex ventilation device. The muffling tube 1232 is provided with a plurality of second muffling holes 1233 with 4mm apertures to form a perforated tube, and the muffling tubes 1232 are mutually converged and communicated. The structure has obvious attenuation at the resonance frequency of the expansion cavity, mainly aims at low-frequency noise, has small regenerative noise and firm structure, and the change of the pipe diameter of the silencing pipe 1232 and the second silencing hole 1233 can obtain the effect of impedance combination. The noise elimination quantity of the impedance composite ventilation device is as follows:

wherein, delta_FDenotes the conductivity of the hole, S denotes the cross-sectional area through which the gas flows, f denotes the frequency of the external acoustic wave, f₀Is the natural frequency of the sound damping unit.

It is easily understood that, in practical applications, when the number and the positions of the vent holes 14 are changed, the number, the connection positions, and the bending shapes of the silencer pipes 1232 may be changed accordingly. And, like the first cavity, second sound-deadening cavity 1231 may also be constituted by a separate housing provided in outer shell 11.

Referring to fig. 5, the combined muffler is formed by combining three kinds of muffler units 1 having different types of muffling devices 12, each of the muffler units 1 is formed by 16 muffler units 1, the same kind of muffler units 1 are arranged in a four-row and four-column array, and the three kinds of muffler units 1 are stacked together in an array to form a matrix shape with a length of 880mm, a width of 660mm and a height of 880 mm. It has the advantages of three kinds of silencing devices 12, and widens the silencing frequency domain. It is easy to understand that the assembling method mentioned in this problem is only some preferred embodiments, and can be adjusted according to the actual situation, and the invention does not limit the assembled shape.

The present invention also provides a preferred embodiment, in the combined muffler, a cavity is formed inside the housing 11, the silencing device 12 is disposed in the cavity, the inner wall of the cavity is covered with sound-absorbing material, and the cavity corresponds to the first silencing cavity and the second silencing cavity 1231. Meanwhile, regular grooves (not shown) are formed in the outer surface of the housing 11, and the outer surface of the housing 11 is covered with a sound absorbing material. The grooves, like the inner chamfer 17 described above, increase the contact area and coefficient of friction for the airflow to pass through, and increase the airflow pressure loss. The sound absorption material can be organic fiber, glass wool, urea-formaldehyde foam plastic, a perforated plate, artificial leather and the like, and can further enhance the noise elimination effect of the whole combined type silencer.

As shown in fig. 9, the present invention also provides a preferred embodiment, the combined muffler further includes a plurality of flaps 3, and the flaps 3 are detachably mounted to the ventilation holes 14 to close the ventilation holes 14. Specifically, the sealing lid 3 in this embodiment is in the shape of a circular lid, and has an inner diameter equal to the outer diameter of the contact block 15 and an inner depth equal to the thickness of the contact block 15. Thus, the sealing cover 3 can be fastened on the contact block 15, and the sealing cover 3 is used for blocking the vent hole 14 of the silencing unit 1 at the non-air outlet and air inlet surface provided with the vent hole 14, so as to play a role in reducing an airflow channel. So that a user can select one or more air inlets and outlets according to the situation of site noise sources, and specifically, the air inlets and outlets can be one inlet and multiple outlets, or the air inlets and outlets can be multiple inlets and multiple outlets.

It is easy to understand that the shape and the closing manner of the sealing cover 3 may be different according to the structure of the sound attenuation unit, for example, the sealing cover 3 is square, one side of the sealing cover is provided with a round hole for being buckled on the contact block 15, and the edge angle of the sealing cover 3 can be used as a stress point, which is convenient for a person to operate. Still further, the sealing lid 3 may have a cylindrical shape and be inserted into the vent hole 14 to close the same.

Compared with the existing silencer, the combined silencer can be flexibly assembled into different shapes according to different conditions of an application field, and is particularly suitable for various narrow and irregular spaces. In addition, different numbers of silencing units 1 can be flexibly assembled according to different required silencing effects, different types of silencing devices 12 are selected and matched, so that silencing in a specific frequency domain and specific volume is achieved, a user is allowed to have no need to purchase silencers of various different models, types and specifications, and only one device can be used for dealing with most working conditions, so that good economic benefits are brought.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. A modular muffler, comprising:

the noise reduction device comprises a plurality of noise reduction units, a plurality of connecting blocks and a plurality of connecting blocks, wherein each noise reduction unit comprises a shell, a noise reduction device and a plurality of connecting blocks, the shell is a regular polyhedron, and the centers of at least two surfaces of the shell are provided with ventilation holes; the silencer is arranged in the shell and is provided with an airflow channel for silencing, and the airflow channel is communicated with all the vent holes; the connecting blocks are respectively arranged on the edges and corners of the shell;

the plurality of silencing units are combined and arranged along the normal direction of the surface of the shell, wherein the opposite vent holes in two adjacent silencing units are communicated to form a vent channel; the connecting blocks between two adjacent shells are connected in a one-to-one correspondence manner.

2. The combined muffler of claim 1, wherein the housing further comprises at least two contact blocks, the contact blocks are respectively disposed on an outer surface of the housing in one-to-one correspondence with the vent holes, the vent holes penetrate through the contact blocks, and two opposite contact blocks of two adjacent muffler units are abutted.

3. The combined muffler according to claim 2, further comprising a plurality of assembling members, wherein the housing is a regular hexahedron, three connecting holes are formed in the connecting block, the three connecting holes are respectively parallel to three orthogonal edges in the housing, two connecting holes in two corresponding connecting blocks between two adjacent muffling units are coaxially arranged to form a connecting channel, and the assembling members are inserted into the connecting channel;

the connecting block further comprises three positioning surfaces, the three positioning surfaces are perpendicular to the axis of the connecting hole respectively and face away from one side of the shell, the distance from the positioning surfaces to the side face of the shell parallel to the positioning surfaces is equal to the distance from one side of the shell to the side face of the shell where the contact block is located, and the two positioning surfaces are in opposite connection in the connecting block.

4. The combined muffler of claim 3, wherein three connecting holes respectively penetrate through the centers of the three positioning surfaces, and the axes of the three connecting holes are respectively superposed with the edges of the three shells on which the corresponding connecting blocks are arranged; an inner chamfer sunken towards the inner side of the shell is formed on the edge of the shell, and the radius of the inner chamfer is larger than or equal to that of the connecting hole; the assembly is a bolt.

5. The combined muffler of any one of claims 1 to 4, wherein the muffler comprises a reactive muffler component or a resistive muffler component or an impedance composite muffler component.

6. The combined muffler of claim 5, wherein the reactive muffler assembly comprises a hollow block disposed in the housing, an inner space of the hollow block is a first muffling cavity, the first muffling cavity constitutes the airflow passage, the first muffling cavity is communicated with the vent, and an area of the vent is smaller than an area of a cross section of the first muffling cavity in an axial direction of the vent.

7. The combined muffler of claim 5, wherein the resistive muffler assembly comprises a muffler block, the muffler block is provided with first muffling holes arranged in an array along three orthogonal directions, the first muffling holes in different directions are communicated with the ventilation holes, and the first muffling holes communicated with each other form the airflow channel.

8. The combined muffler of claim 5, wherein the impedance complex ventilation device comprises a second muffling cavity and a plurality of muffling pipes, wherein the second muffling cavity is surrounded by the inner wall of the housing, two ends of each muffling pipe are respectively connected to two of the ventilation holes, the pipe diameters of the two ends of each muffling pipe are larger than the diameters of the ventilation holes, a plurality of second muffling holes are formed in each muffling pipe, and the muffling pipes are connected with each other to form the airflow channel.

9. The combined silencer according to any one of claims 1 to 4, wherein a cavity is formed in the shell, the silencer is arranged in the cavity, and the inner wall of the cavity is covered with a sound absorption material; regular grooves are formed in the outer surface of the shell, and sound absorption materials are covered on the outer surface of the shell.

10. The combined silencer of any one of claims 1 to 4, further comprising a plurality of sealing caps detachably mounted to the ventilation holes for closing the ventilation holes.