阅读说明：本技术 一种管道多层微穿孔板***及其加工方法 (Pipeline multilayer micro-perforated plate silencer and processing method thereof ) 是由 孙宏菲 程曼 班福生 于 2019-11-19 设计创作，主要内容包括：本发明适用于声学技术领域,提供了一种管道多层微穿孔板消声器,包括：外管；微穿孔管,数量为若干个,沿所述外管的径向设置在所述外管内,若干个所述微穿孔管依次嵌套,用于消声；所述外管的两端封闭,且其上设有与处于最内层的所述微穿孔管连通的让位孔,本发明的有益效果是：其内部采用超微孔板,无纤维吸声材料,具有使用寿命长,无污染,耐高温、耐潮湿及高速气流冲击的特点,特别适用于环境要求比较高及环境恶劣的场合；并且多层微孔板并联,多层微穿孔板的属性和层间距经过声学设计,从而拓宽消声器的消声频带,提高消声性能。(The invention is suitable for the technical field of acoustics, and provides a pipeline multilayer micropunch plate silencer, which comprises: an outer tube; the micro perforated pipes are arranged in the outer pipe along the radial direction of the outer pipe, and are sequentially nested for silencing; the two ends of the outer pipe are sealed, and the outer pipe is provided with abdicating holes communicated with the micro-perforated pipe at the innermost layer, and the invention has the beneficial effects that: the interior of the shell is provided with a super microporous plate and a fiber-free sound absorption material, so that the shell has the characteristics of long service life, no pollution, high temperature resistance, moisture resistance and high-speed airflow impact resistance, and is particularly suitable for occasions with higher environmental requirements and severe environments; and the multilayer microperforated plates are connected in parallel, and the properties and the interlayer spacing of the multilayer microperforated plates are acoustically designed, so that the noise elimination frequency band of the silencer is widened, and the noise elimination performance is improved.)

1. A multi-layer microperforated panel muffler for a pipe, comprising:

an outer tube;

the micro perforated pipes are arranged in the outer pipe along the radial direction of the outer pipe, and are sequentially nested for silencing;

the two ends of the outer pipe are sealed, and a yielding hole communicated with the micro-perforated pipe at the innermost layer is formed in the outer pipe.

2. The muffler of claim 1, wherein a plurality of partitions are further disposed along the axial direction of the outer pipe to divide the inner space of the outer pipe into a plurality of sections, and the inner and outer sides of the partitions are respectively connected to the outer wall of the microperforated pipe located at the innermost layer and the inner wall of the outer pipe.

3. The muffler of claim 2, wherein both ends of the microperforated tube are connected to the ends of the baffle or the outer tube.

4. The muffler of claim 3, wherein the partition plate has a plurality of connectors corresponding to the openings at the ends of the microperforated tubes for connecting to the microperforated tubes.

5. The muffler of claim 4, wherein the connector is a slot or clip provided on the partition.

6. The muffler of any one of claims 1 to 5, wherein the outer pipe comprises a straight pipe section and/or a bent pipe section, and the microperforated pipe also comprises a straight pipe section and/or a bent pipe section.

7. The muffler of claim, wherein a flange is attached to the end of the outer pipe at a relief hole communicating with the microperforated pipe at the innermost layer.

8. The processing method of the silencer with the multilayer micro-perforated plates for the pipeline is characterized by comprising the following steps of:

adopting standard pipes or rolling and seamlessly welding steel plates to manufacture a plurality of outer pipes;

rounding the micro-perforated plate into a round pipe with a designed size to form a micro-perforated pipe, and sequentially connecting the micro-perforated pipe to the partition plate according to the sequence of contact with the airflow;

after the micro-perforated pipe is connected with the partition board, the micro-perforated pipe is placed into the outer pipe, and the partition board and the outer pipe are welded and fixed.

9. The method as claimed in claim 8, wherein when connecting a plurality of said outer pipes, the metal partition is first connected to the micro-perforated pipe in another outer pipe, and then the adjacent outer pipes are welded and fixed.

10. The method for processing the muffler of the multi-layer micro-perforated plate of the pipeline according to claim 8, wherein the connection mode of the micro-perforated pipes and the partition plate comprises welding and/or clamping.

Technical Field

The invention relates to the technical field of acoustics, in particular to a pipeline multilayer micro-perforated plate silencer and a processing method thereof.

Background

During the noise development process of the turbocharger, reflected noise caused by the operation of other turbochargers in a test system needs to be eliminated. Due to the influence of high-temperature and high-flow airflow in a test system, the traditional resistive silencer is easy to cause higher airflow regenerative noise when the air quantity is larger, and the silencing performance of the silencer is reduced. The micro-perforated plate silencer utilizes the inner micro-perforated plate to perform resonance sound absorption under certain cavity conditions, traditional porous sound absorption materials are not needed, and the problems of airflow regeneration noise increase and temperature limitation are solved.

However, the traditional silencer with the single-layer micro-perforated plate has lower silencing volume, narrower silencing frequency band and lower engineering use value.

Disclosure of Invention

The embodiment of the invention aims to provide a pipeline multilayer micro-perforated plate silencer and a processing method thereof, and aims to solve the problems of low silencing volume and narrow silencing frequency band of the traditional single-layer micro-perforated plate silencer.

The embodiment of the invention is realized in such a way that the silencer of the multi-layer micro-perforated plate of the pipeline comprises:

an outer tube;

the micro perforated pipes are arranged in the outer pipe along the radial direction of the outer pipe, and are sequentially nested for silencing;

the two ends of the outer pipe are sealed, and a yielding hole communicated with the micro-perforated pipe at the innermost layer is formed in the outer pipe.

As a further scheme of the invention: and a plurality of partition plates are further arranged along the axial direction of the outer pipe to divide the inner space of the outer pipe into a plurality of sections, and the inner side and the outer side of each partition plate are respectively connected with the outer wall of the micro-perforated pipe positioned at the innermost layer and the inner wall of the outer pipe.

As a still further scheme of the invention: both ends of the micro-perforated pipe are connected with the end part of the baffle plate or the outer pipe.

As a still further scheme of the invention: the partition board is provided with a plurality of connecting pieces corresponding to the openings at the end parts of the micro-perforated pipes, and the connecting pieces are used for being connected with the micro-perforated pipes.

As a still further scheme of the invention: the connecting piece is a clamping groove or a clamping clip arranged on the clapboard.

As a still further scheme of the invention: the outer pipe comprises a straight pipe section and/or a bent pipe section, and the micro-perforated pipe also comprises a straight pipe section and/or a bent pipe section.

As a still further scheme of the invention: the end part of the outer pipe and the yielding hole communicated with the micro-perforated pipe at the innermost layer are connected with a flange.

Another object of an embodiment of the present invention is to provide a method for processing a muffler of a multi-layer micro-perforated pipe of a pipeline, including the following steps:

adopting standard pipes or rolling and seamlessly welding steel plates to manufacture a plurality of outer pipes;

rounding the micro-perforated plate into a round pipe with a designed size to form a micro-perforated pipe, and sequentially connecting the micro-perforated pipe to the partition plate according to the sequence of contact with the airflow;

after the micro-perforated pipe is connected with the partition board, the micro-perforated pipe is placed into the outer pipe, and the partition board and the outer pipe are welded and fixed.

As a still further scheme of the invention: when a plurality of outer pipes are connected, the metal partition plate is connected with the micro-perforated pipe in the other outer pipe, and then the adjacent outer pipes are welded and fixed.

As a still further scheme of the invention: the connection mode of the micro-perforated pipe and the partition plate comprises welding and/or clamping.

Compared with the prior art, the invention has the beneficial effects that: the interior of the shell is provided with a super microporous plate and a fiber-free sound absorption material, so that the shell has the characteristics of long service life, no pollution, high temperature resistance, moisture resistance and high-speed airflow impact resistance, and is particularly suitable for occasions with higher environmental requirements and severe environments; and the multilayer microperforated plates are connected in parallel, and the properties and the interlayer spacing of the multilayer microperforated plates are acoustically designed, so that the noise elimination frequency band of the silencer is widened, and the noise elimination performance is improved.

Drawings

Fig. 1 is a schematic structural diagram of a silencer of a multi-layer micro-perforated pipe of a pipeline.

Fig. 2 is a schematic diagram of the internal structure of a muffler for a multi-layer micro-perforated pipe of a pipeline.

Fig. 3 is a schematic cross-sectional structure diagram of a silencer of a multi-layer micro-perforated pipe of a pipeline.

Fig. 4 is a schematic structural diagram of a connecting piece in a silencer of a multi-layer micro-perforated pipe of a pipeline.

Fig. 5 is an enlarged view of a structure shown in fig. 4.

Fig. 6 is a schematic diagram of the internal structure of a muffler with a plurality of micro-perforated pipes (three micro-perforated pipes).

In the drawings: 1-a flange; 2-a straight pipe section; 3-bending the pipe section; 4-a separator; 5-microperforated tubing; 6-outer tube; 7-first layer of microperforated tubing; 8-a second layer of microperforated tubing; 9-a third layer of microperforated tubing; 10-a fourth layer of microperforated tubing; 11-a connector; 12-welding spots; 13-a card slot; 14-a clip.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

As shown in fig. 1-2, a schematic structural diagram of a silencer with a multi-layer micro-perforated plate for a pipeline according to an embodiment of the present invention includes: an outer tube 6 and a microperforated tube 5; the outer pipe 6 can be made of a metal material, the number of the micro perforated pipes 5 is several, the micro perforated pipes are arranged in the outer pipe 6 along the radial direction of the outer pipe 6, and the micro perforated pipes 5 are sequentially nested for noise elimination; the two ends of the outer pipe 6 are sealed, and a yielding hole communicated with the micro-perforated pipe 5 at the innermost layer is formed in the outer pipe.

In the embodiment, the stainless steel or galvanized steel has long service life, no pollution, high temperature resistance, humidity resistance and high-speed airflow impact resistance, and is particularly suitable for occasions with higher environmental requirements and severe environments.

When sound is transmitted outwards, the sound needs to pass through the action of the multiple layers of micro-perforated plates, and a certain distance exists between the micro-perforated plates, so that a wider silencing frequency band can be obtained, and the silencing performance is improved.

As shown in fig. 1 to 2, as a preferred embodiment of the present invention, a plurality of partition plates 4 are further disposed along an axial direction of the outer tube 6 to divide an inner space of the outer tube 6 into a plurality of sections, and inner and outer sides of the partition plates 4 are respectively connected to an outer wall of the microperforated tube 5 located at an innermost layer and an inner wall of the outer tube 6.

When the length of the micro-perforated pipe 5 is long, it is difficult to ensure the distance between the middle positions, and therefore, the partition plate 4 is provided in the present embodiment to ensure the distance between the adjacent micro-perforated pipes 5 to be consistent, or in other words, the muffler is actually formed by splicing multiple sections.

The number of baffles 4 is determined by the length of the outer tube 6 or microperforated tube 5 and can be generally segmented by 500mm per segment for straight tubes and by the size of the curvature for curved tubes.

As shown in fig. 3 to 5, as another preferred embodiment of the present invention, two ends of the micro-perforated pipe 5 are connected to the end of the partition plate 4 or the outer pipe 6, a plurality of connecting members 11 are provided on the partition plate 4 corresponding to the openings at the ends of the micro-perforated pipe 5 for connecting to the micro-perforated pipe 5, and the connecting members are slots 13 or clips 14 provided on the partition plate 4.

Specifically, the connecting member 11 is used to facilitate connection with the microperforated tube 5, but the engaging groove 13 or the engaging clip 14 is not limited to two commonly used means, and other suitable means may be used to achieve connection in practical applications.

As another preferred embodiment of the present invention, as shown in fig. 1, the outer tube 6 comprises a straight tube section and/or a bent tube section, and the microperforated tube 5 also comprises a straight tube section 2 and/or a bent tube section 3. That is, the muffler may have a straight pipe shape or a bent pipe shape.

As another preferred embodiment of the present invention, as shown in FIG. 2, a flange 1 is attached to an abdicating hole at the end of the outer tube 6 communicating with the microperforated tube 5 at the innermost layer. The flange 1 can be a fixed flange or a loose flange, and the flange 1 is used for being connected with an upstream pipeline and a downstream pipeline of an original test system.

The working principle of the invention is as follows: taking the silencer as an example of a bent pipe shape, the silencer is internally provided with four layers of micro-perforated pipes 5, namely a first layer of micro-perforated pipes 7, a second layer of micro-perforated pipes 8, a third layer of micro-perforated pipes 9 and a fourth layer of micro-perforated pipes 10 shown in figures 2 and 3, parameters and intervals of the micro-perforated pipes in the straight pipe section and the bent pipe section are kept consistent, and the bent pipe section is welded with the straight pipe section. Wherein:

the first layer of micro-perforated pipes 7 are made of stainless steel materials, the thickness is 0.38mm, the perforation rate is 5%, and the aperture is 0.4 mm; the air layer between the first layer of micro-perforated pipes 7 and the second layer of micro-perforated pipes 8 is 21 mm;

the second layer of micro-perforated pipes 8 are made of stainless steel materials, the thickness is 0.47mm, the perforation rate is 3%, and the aperture is 0.4 mm; the air layer between the second layer of micro-perforated pipes 8 and the third layer of micro-perforated pipes 9 is 21 mm;

the third layer of micro-perforated pipe 9 is made of stainless steel material, the thickness is 0.68mm, the perforation rate is 2%, and the aperture is 0.4 mm; the air layer between the third layer of micro-perforated pipes 9 and the fourth layer of micro-perforated pipes 10 is 36 mm;

the fourth layer of micro-perforated pipes 10 are made of stainless steel materials, the thickness is 0.65mm, the perforation rate is 3%, and the aperture is 0.4 mm; the air layer between the fourth microperforated tube 10 and the outer tube 6 was 41 mm.

Taking the silencer as a bent pipe shape as an example, as shown in fig. 6, the silencer is internally provided with four layers of micro-perforated pipes 5, namely a first layer of micro-perforated pipes 7, a second layer of micro-perforated pipes 8 and a third layer of micro-perforated pipes 9, parameters and intervals of the micro-perforated pipes in the straight pipe section and the bent pipe section are kept consistent, and the bent pipe section is welded with the straight pipe section. Wherein:

the first layer of micro-perforated pipes 7 are made of stainless steel materials, the thickness is 0.38mm, the perforation rate is 4%, the pore diameter is 0.4mm, and the air layer between the first layer of micro-perforated pipes 7 and the second layer of micro-perforated pipes 8 is 21 mm;

the second layer of micro-perforated pipes 8 are made of stainless steel materials, the thickness is 0.35mm, the perforation rate is 3%, the aperture is 0.4mm, and the air layer between the second layer of micro-perforated pipes 8 and the third layer of micro-perforated pipes 9 is 34 mm;

the third layer of micro-perforated pipe 9 is made of stainless steel material, the thickness is 1.0mm, the perforation rate is 3%, and the aperture is 0.4 mm; the air layer between the third microperforated tube 9 and the outer tube 6 was 65 mm.

That is, the distance between each layer of microperforated tubes, the thickness, may exhibit some regular variation.

The embodiment of the invention also provides a processing method of the pipeline multilayer micro-perforated pipe silencer, which comprises the following steps:

the method is characterized in that standard pipes or steel plates are adopted to be rolled and welded seamlessly to manufacture outer pipes, the number of the outer pipes is multiple, the number of the outer pipes is determined according to the size of the finally obtained silencer, the outer pipes are segmented according to the length of 500mm, the number of segmented sections of the bent pipe part is related to the curvature of the bent pipe part, and the number of the segmented sections is at least 3;

rounding the micro-perforated plate into a round pipe with a designed size to form a micro-perforated pipe, and sequentially connecting the micro-perforated pipe to the partition plate according to the sequence of contact with air flow, wherein the connection mode can be a clamping groove, a clamping mode, a welding mode or a combination of the clamping groove, the clamping mode and the welding mode;

and after the micro-perforated pipe and the partition board are connected, putting the whole micro-perforated pipe into the outer pipe, and welding and fixing the partition board and the outer pipe.

When a plurality of outer pipes are connected, the metal partition plate is connected with the micro-perforated pipe in the other outer pipe, and then the adjacent outer pipes are welded and fixed. For a silencer with a straight pipe section and a bent pipe section, the straight pipe section and the bent pipe section need to be processed separately and then connected by welding.

The embodiment of the invention provides a silencer of a multilayer micro-perforated pipe of a pipeline, and a processing method of the silencer of the multilayer micro-perforated pipe of the pipeline is provided based on the silencer, the silencer adopts a super-micro-perforated plate in the silencer, and the silencer is made of fiber-free sound absorption material, has the characteristics of long service life, no pollution, high temperature resistance, humidity resistance and high-speed airflow impact resistance, and is particularly suitable for occasions with higher environmental requirements and severe environments; and the multilayer microperforated plates are connected in parallel, and the properties and the interlayer spacing of the multilayer microperforated plates are acoustically designed, so that the noise elimination frequency band of the silencer is widened, and the noise elimination performance is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.