CN211654297U - Silencer with high-temperature-resistant metal damping sandwich structure - Google Patents
Silencer with high-temperature-resistant metal damping sandwich structure Download PDFInfo
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- CN211654297U CN211654297U CN201922403095.2U CN201922403095U CN211654297U CN 211654297 U CN211654297 U CN 211654297U CN 201922403095 U CN201922403095 U CN 201922403095U CN 211654297 U CN211654297 U CN 211654297U
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Abstract
The utility model relates to a take silencer of high temperature resistant metal damping sandwich structure, including the coincident metal inner tube that just from interior toward setting gradually outward, acoustic absorber and metal outer tube of axis, the acoustic absorber is space network structure's metal damping sandwich layer, all be connected through vacuum brazing between the inner wall of metal damping sandwich layer and the outer wall of metal inner tube, between the outer wall of metal damping sandwich layer and the inner wall of metal outer tube. The utility model has reasonable structure design, adopts the elastic porous metal damping sandwich layer as the sound absorption material, and has the purposes of noise reduction and heat conduction; the metal damping sandwich layer is connected with the metal inner pipe and the metal outer pipe through vacuum brazing, and the defect that the traditional connection mode such as adhesion cannot resist high temperature is overcome.
Description
The technical field is as follows:
the utility model relates to a take silencer of high temperature resistant metal damping sandwich structure.
Background art:
in some specific silencing equipment use environments, new requirements are provided for the sound absorption material of the resistive silencer, and the traditional sound absorption material is difficult to meet the high-temperature environment. At present, the sound absorption materials on the market mainly adopt materials such as glass fiber cotton, rock wool, foamed aluminum and the like as resistive materials, but the materials have the following defects:
1. when the traditional glass fiber cotton, rock wool and the like are used for sound absorption materials, the sound absorption performance of the materials in a humid environment is greatly influenced, the materials are fragile and easy to break, and in addition, a complex protective layer is required to be additionally arranged during use because the materials are soft, so that the environment can be polluted in the manufacturing process of the raw materials. And a silencer adopting a foamed aluminum material as a core material has poor homogeneity, is difficult to control sound absorption performance, has low mechanical strength, can generate cracks, and is easy to block a gas channel of the device when medium vibration is large. In addition, the sound-absorbing resistive material is difficult to meet the service working condition of the high-temperature and especially ultra-high-temperature environment.
2. Nonmetal sound absorbing material is mostly adhesive bonding with the silencer pipe wall, and this kind of connected mode sound absorbing performance is limited under high temperature environment, and the reliability of intensity is difficult to guarantee, and influences life.
3. The traditional sound absorption material rarely has obvious damping vibration attenuation effect, and the service life and the performance of the silencer are difficult to guarantee in some extreme environments with continuous vibration.
The utility model has the following contents:
the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a take silencer of high temperature resistant metal damping sandwich structure is provided, structural design is reasonable, has solved current silencer heat resistance poor, has required high problem to service environment.
In order to realize the purpose, the utility model discloses a technical scheme is: the silencer with the high-temperature-resistant metal damping sandwich structure comprises a metal inner pipe, a sound absorption layer and a metal outer pipe, wherein the metal inner pipe, the sound absorption layer and the metal outer pipe are coincident in axis and are sequentially arranged from inside to outside, the sound absorption layer is a metal damping sandwich layer of a space net structure, and the inner wall of the metal damping sandwich layer and the outer wall of the metal inner pipe and the outer wall of the metal damping sandwich layer and the inner wall of the metal outer pipe are connected through vacuum brazing.
Furthermore, a plurality of heat dissipation holes are distributed on the peripheral side wall of the metal outer pipe.
Furthermore, the outer wall of the metal inner pipe and the inner wall of the metal outer pipe are coated with brazing filler metal coatings for vacuum brazing.
Furthermore, the brazing filler metal coating of the inner wall of the metal outer pipe is located in the longitudinal gap of the heat dissipation hole.
Further, the brazing filler metal coating is nickel-based brazing filler metal.
Furthermore, the metal damping sandwich layer is prepared by winding a metal wire and then rolling.
Furthermore, the cross sections of the metal inner pipe, the metal outer pipe and the metal damping sandwich layer are all circular.
Compared with the prior art, the utility model discloses following effect has: (1) the utility model has reasonable structure design, adopts the elastic porous metal damping sandwich layer as the sound absorption material, and has the purposes of noise reduction and heat conduction; (2) the metal damping sandwich layer is made by adopting a metal wire mesh winding and rolling process, an elastic effect similar to a spring is reserved, the whole silencer is not easy to deform after being impacted, and the service life is long; (3) the metal damping sandwich layer is connected with the metal inner pipe and the metal outer pipe through vacuum brazing, and the defect that the traditional connection mode such as adhesion cannot resist high temperature is overcome.
Description of the drawings:
fig. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic view of a metal inner tube brazed to a metal damping sandwich layer;
FIG. 3 is a schematic illustration of a metal outer tube brazed to a metal damping sandwich layer;
FIG. 4 is a schematic roll press of a metallic damping sandwich layer;
fig. 5 is a schematic perspective view of a metal damping sandwich layer.
In the figure:
1-metal inner tube; 2-a metal damping sandwich layer; 3-solder coating; 4-a metal outer tube; 5-a first clamping block; 6-a second clamping block; 7-moving rollers; 8-metal damping sandwich layer blank; 9-winding the mandrel; 10-fixed roll; 11-heat dissipation holes.
The specific implementation mode is as follows:
in order to explain the present invention more clearly, the following description of the present invention is made with reference to the accompanying drawings and examples, and it is to be understood that the drawings listed below are merely some specific examples of the present invention.
As shown in fig. 1, the utility model relates to a take silencer of high temperature resistant metal damping sandwich structure, including the coincident metal inner tube 1, acoustic absorber layer and the metal outer tube 4 that sets gradually from inside to outside of axis coincidence, the acoustic absorber layer is space network structure's metal damping sandwich layer 2, all be connected through vacuum brazing between the inner wall of metal damping sandwich layer 2 and the outer wall of metal inner tube 1, between the outer wall of metal damping sandwich layer 2 and the inner wall of metal outer tube 4, realize high temperature resistance's characteristic.
In this embodiment, a plurality of heat dissipation holes 11 are distributed on the peripheral sidewall of the metal outer tube 4; the louvers function to dissipate heat converted by the acoustic energy within the muffler.
In this embodiment, the outer wall of the inner metal tube 1 and the inner wall of the outer metal tube 4 are both coated with a brazing filler metal coating 3 for vacuum brazing, the brazing filler metal coating is BNi76CrP (nickel-based solder), and the brazing temperature is 1100-1150 ℃, so that the brazing filler metal coatings are melted.
In this embodiment, in order to ensure the welding connection strength between the metal inner tube 1 and the metal damping sandwich layer 2, two first clamping blocks 5 arranged in opposite directions are designed on the periphery of the metal damping sandwich layer 2 during welding, and a workpiece is reinforced in a vacuum brazing furnace during brazing, as shown in fig. 2.
In this embodiment, the metal outer tube 4 is a metal sheet with holes (heat dissipation holes) and wrapped by the metal damping sandwich layer 2 after bending, and also adopts a vacuum welding connection mode, two second clamping blocks 6 arranged in opposite directions are adopted for reinforcement during welding, and after the edges of the sheet are folded, the gap is welded and sealed, as shown in fig. 3.
In this embodiment, since the heat dissipation holes 11 in the side wall of the metal outer tube 4 are small, in order to prevent the brazing filler metal from blocking the heat dissipation holes during brazing, the brazing filler metal coating 3 is coated in the longitudinal gaps of the heat dissipation holes 11.
In this embodiment, the preparation process of the metal damping sandwich layer 2 as the sound absorbing material includes the steps of wire winding, wire drawing, blank winding, roll forming and the like. The wire winding is a spiral winding structure which winds metal wires made of proper materials and in proper sizes into a spring-like shape, and the spiral winding structure is more beneficial to hooking the metal wires. After the metal wire of the spiral coil is pulled apart by a certain screw pitch, the metal wire is wound on a winding mandrel with a proper size, and a blank is formed by multilayer winding. The integral structure formed by rolling is shown in figure 4, and comprises a movable roller 7, a metal damping sandwich layer blank 8, a winding mandrel 9 and a fixed roller 10. During preparation, the winding mandrel 9 rotates along with the movable roller 7 under the action of friction force between the movable roller and the blank. The rotating directions of the movable roller 7 and the fixed roller 10 are the same, downward pressure is applied to the metal damping sandwich layer blank 7 through downward movement of the movable roller 7, and the elastic porous metal damping sandwich layer with proper size and density is obtained. The metal damping sandwich layer is a homogeneous elastic porous space net-shaped material, as shown in fig. 5, the material has a large number of mutually-communicated micropores and gaps from the surface to the inside, also has air permeability, conforms to the characteristics of a porous sound-absorbing material, and belongs to the porous sound-absorbing material. The metal wire spiral coils of each layer in the material are mutually staggered and hooked, and the layers are mutually embedded through rolling, so that the dense elastic porous damping material is finally formed.
In this embodiment, the metal inner tube 1, the metal outer tube 4 and the metal damping sandwich layer 2 are all cylindrical structures, and the cross sections thereof are all circular.
The silencer is improved and optimized on the basis of a resistive silencer made of a traditional material, a metal damping sandwich layer prepared in a rolling mode is used as a sound absorption material, and the novel sound absorption material is provided on the premise that the traditional sound absorption material fails under severe conditions such as high temperature and vibration. The silencer structure adopts a vacuum hot-pressing brazing technology to connect the sound absorption material and the silencer pipe wall. It has the following advantages:
1) the metal damping sandwich layer is used as a sound absorption material, the silencer not only has the characteristics of high mechanical strength, high temperature resistance, high damping and the like, but also is made of metal spiral coils, the elastic effect similar to a spring is also kept, the silencer is not easy to deform integrally after being impacted, and the service life is long;
2) the metal damping sandwich layer is used as a sound absorption material, the internal pores are uniformly and regularly arranged, and the internal porosity can be changed by changing the density of the metal damping sandwich layer so as to adapt to noises with different frequencies, so that the application range is wide;
3) the metal damping sandwich layer as the sound absorption material is made of metal wires, can play a role in heat conduction and can dissipate heat converted by sound energy;
4) the metal damping sandwich layer is prepared by a three-roller pressing process, so that the problems that the metal damping sandwich layer prepared by the traditional punching process is easy to layer and has insufficient hooking strength can be solved;
5) the metal damping sandwich layer is connected with the pipe wall (the inner metal pipe and the outer metal pipe) of the silencer in a vacuum brazing mode, the defect that the traditional connecting modes such as adhesion cannot resist high temperature is overcome, and the welding effect is better, the surface of the silencer is smooth, and the silencer has good air tightness.
The utility model has the advantages that: as the elastic porous metal damping sandwich layer of the sound absorption material, the structure is more compact, the internal porosity is uniformly distributed, and the sound absorption material has the characteristics of long service life, high temperature resistance, damping effect and the like. The metal damping sandwich layer is a three-dimensional porous structure formed by mutually hooking metal wires, when sound waves are scattered into the metal damping sandwich layer through the inner pipe, sound energy can rub with the metal wires and the vibration of air molecules in pores is converted into heat, and the heat is scattered through small holes in the outer pipe, so that the aims of noise reduction and heat conduction are fulfilled. In addition, the adopted vacuum hot-pressing brazing composite connection technology ensures the structural strength and the high-temperature resistant environmental service requirement.
In the embodiment, when the sound silencer works, sound waves enter the metal damping sandwich layer brazed with the metal inner tube from the metal inner tube, and a large number of pores are formed in the metal damping sandwich layer and are communicated with each other to penetrate into the material; the sound wave excites the vibration of air molecules in the pores inside the metal damping sandwich layer, the air vibration is the result of continuous compression and expansion, and the sound energy can be absorbed by the heat exchange with the framework of the porous metal damping sandwich layer; due to the viscous resistance of the air and the friction between the air and the side wall of the pore, a part of sound energy is converted into heat energy to be lost, so that the aim of silencing is fulfilled; because the metal damping sandwich layer is made by spirally winding the metal wires, the converted heat can be transferred to the outer pipe 3 of the silencer and is dissipated from the heat dissipation holes. The silencer is used for medium-high frequency silencing environments such as vehicle exhaust, pipeline silencing, fan and the like, noise reduction of equipment is achieved, and the service life of the equipment is prolonged.
The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (7)
1. The utility model provides a take silencer of high temperature resistant metal damping sandwich structure which characterized in that: including the coincident metal inner tube that and from interior toward setting gradually outward of axis, acoustic absorber and metal outer tube, the acoustic absorber is space network structure's metal damping sandwich layer, all be connected through vacuum brazing between the inner wall of metal damping sandwich layer and the outer wall of metal inner tube, between the outer wall of metal damping sandwich layer and the inner wall of metal outer tube.
2. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 1, is characterized in that: and a plurality of heat dissipation holes are distributed on the peripheral side wall of the metal outer pipe.
3. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 1, is characterized in that: and the outer wall of the metal inner pipe and the inner wall of the metal outer pipe are coated with brazing filler metal coatings for vacuum brazing.
4. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 3, wherein: and the brazing filler metal coating on the inner wall of the metal outer pipe is positioned in the longitudinal clearance of the heat dissipation hole.
5. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 3 or 4, is characterized in that: the brazing filler metal coating is nickel-based brazing filler metal.
6. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 1, is characterized in that: the metal damping sandwich layer is prepared by winding a metal wire and then rolling.
7. The muffler with the high-temperature-resistant metal damping sandwich structure according to claim 1, is characterized in that: the cross sections of the metal inner pipe, the metal outer pipe and the metal damping sandwich layer are all circular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922403095.2U CN211654297U (en) | 2019-12-27 | 2019-12-27 | Silencer with high-temperature-resistant metal damping sandwich structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922403095.2U CN211654297U (en) | 2019-12-27 | 2019-12-27 | Silencer with high-temperature-resistant metal damping sandwich structure |
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| CN211654297U true CN211654297U (en) | 2020-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111081211A (en) * | 2019-12-27 | 2020-04-28 | 福州大学 | Silencer with high-temperature-resistant metal damping sandwich structure and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111081211A (en) * | 2019-12-27 | 2020-04-28 | 福州大学 | Silencer with high-temperature-resistant metal damping sandwich structure and working method thereof |
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