CN110332153A - A multi-stage continuous silencer - Google Patents

Abstract

The invention provides a multi-stage continuous silencer, which comprises a silencer body, an air inlet arranged at the bottom of the silencer body, an air outlet arranged at the top of the silencer body, a primary silencer chamber and a second stage inside the silencer body. The first-level anechoic chamber, the first-level anechoic chamber communicates with the second-level anechoic chamber, the first-level anechoic chamber is provided with a perforated pipe connected to the air inlet, and the second-level anechoic chamber is arranged along the inner wall of the anechoic tube body There is a layer of sound-absorbing material. This solution has a compact structure, and adopts a multi-stage noise-absorbing structure connected in series to silence the gas, which has obvious sound-absorbing and noise-reducing effects.

Description

A multi-stage continuous silencer

technical field

The invention relates to the technical field of sound-absorbing equipment, in particular to a multi-stage continuous sound-absorbing device.

Background technique

In industrial production, when a large amount of gas is discharged, it will cause a lot of noise, forming noise pollution and affecting the environment. According to the national environmental protection requirements, the noise must be controlled. Therefore, it is necessary to install the muffler on the air flow channel of the fan and other equipment or in the intake and exhaust system to absorb the strong noise generated by the exhaust gas. For example, the Chinese invention patent with the authorized announcement number CN201720359924.X discloses a muffler for cement plants, including a muffler net, a muffler cotton and a shell; the muffler cotton is arranged between the shell and the muffler net; the muffler is set in a cuboid shape; The left side wall of the casing is provided with an air inlet near the top, and the bottom of the casing is provided with an air outlet, so that the center line of the air inlet and the center line of the air outlet form an angle of 90 degrees; the left side wall and the right side wall are respectively provided with Several sound-absorbing sheets, the left-side wall and right-side wall sound-absorbing sheets are arranged alternately in the left-right direction and up-down direction of the muffler; there is a sound-absorbing gap between the sound-absorbing cotton and the mounting part, which realizes the simple replacement of the sound-absorbing cotton .

However, the above-mentioned patent application has the following problems. During the noise reduction process, the sound absorption and noise reduction effect of the device is not obvious, which cannot meet the environmental protection requirements in the production of enterprises.

Contents of the invention

The object of the present invention is to provide a multi-stage continuous noise reduction device with a compact structure, which adopts a multi-stage noise reduction structure in series to silence the gas, and has obvious sound absorption and noise reduction effects.

The above-mentioned technical purpose of the present invention is achieved by the following technical solutions: a multi-stage continuous noise reduction device, comprising a sound reduction body, an air inlet arranged at the bottom of the sound reduction body, an air outlet arranged at the top of the sound reduction body, a set The first-level anechoic chamber and the second-level anechoic chamber inside the muffler body, the first-level anechoic chamber and the second-level anechoic chamber are connected, and the first-level anechoic chamber is provided with a perforated pipe communicating with the air inlet. A sound-absorbing material layer is arranged in the secondary anechoic chamber along the inner wall of the anechoic tube body.

By adopting the above technical scheme: the gas with sound waves enters the perforated pipe of the first-level anechoic chamber from the air inlet, and the gas is dispersed into small airflows in different directions, and the gas with sound waves gathered by the small airflows enters the second-level anechoic chamber. It is absorbed by the sound-absorbing material layer in the secondary anechoic chamber, and finally discharged from the air outlet on the top of the anechoic cylinder.

As a further improvement of the present invention, the primary anechoic chamber and the secondary anechoic chamber are separated by a cross support.

By adopting the above technical scheme: the cross support frame can play the role of support, connection, and separation, respectively supporting the perforated pipe in the first-level anechoic chamber and the sound-absorbing material layer in the second-level anechoic chamber, and can ensure that the first-level anechoic chamber and the second-level anechoic chamber Connectivity between stage anechoic chambers.

As a further improvement of the present invention, the primary anechoic chamber includes a baffle, and the baffle is arranged at a position corresponding to the direction of the air inlet for changing the flow direction of the gas in the air inlet.

By adopting the above technical solution: the gas at the air inlet is deflected after encountering the spoiler, and the energy in the noise can be effectively reduced by adopting the circuitous deflection method.

As a further improvement of the present invention, the perforated pipe is provided with several sound-absorbing holes along the axial and circumferential directions of the pipe wall. One end of the perforated pipe is closed and the other end is open. The closed end is fixedly connected to the cross support frame. One end faces the bottom of the muffler body.

As a further improvement of the present invention, the inner wall of the perforated tube is provided with spoiler fins spirally surrounding the inner wall.

By adopting the above-mentioned technical scheme: the gas path passing through the straight line is changed into a vortex-shaped path, and the vortex-shaped path passes through the sound-absorbing hole on the perforated tube to change the direction of the gas to a different direction, and at the same time, the sound wave energy in the gas is absorbed Scatter, reflect in different directions, and cancel each other out, further improving the sound-absorbing effect.

As a further improvement of the present invention, it also includes a baffle ring, the baffle ring is an annular plate-shaped structure, and a central hole is arranged in the middle, and the open end of the perforated pipe passes through the center hole and extends to the bottom of the muffler body, the baffle The outer wall of the ring is fixedly connected with the inner wall of the muffler body, the inner wall of the central hole is fixedly connected with the outer wall of the perforated pipe, and the partition ring is arranged on the side where the air inlet is away from the bottom of the muffler body.

By adopting the above technical scheme: the partition ring can isolate the first-level anechoic chamber from the air inlet, so that the gas enters the bottom of the muffler body from the air inlet and then enters the perforated tube for silence, preventing the gas from consuming energy without passing through the perforated tube. Enter the secondary anechoic chamber to improve the effect of gas anechoic treatment.

As a further improvement of the present invention, the outer wall of the perforated pipe, the cross support frame, the partition ring and the inner wall of the muffler body constitute a gas expansion cavity, and a sound-absorbing material layer is arranged on the inner wall of the muffler body in the gas expansion cavity.

By adopting the above technical solution: the gas enters the expansion chamber and expands to decelerate, and the sound-absorbing material layer on the inner wall further absorbs the sound wave energy, completely reduces the sound wave energy in the gas, and reduces the noise in the gas.

As a further improvement of the present invention, in the axial direction of the perforated pipe, a number of sound-absorbing holes uniformly distributed along the circumferential direction of the perforated pipe are provided on the pipe wall from the cross support frame to the partition ring, and the sound-absorbing holes are arranged in a staggered manner.

By adopting the above technical solution, the turbulence effect when the gas comes out of the sound-absorbing hole can be improved, the dispersion effect of the air flow can be improved, the collision resonance between the gases can be reduced, and the sound-absorbing effect of the sound-absorbing device can be further improved.

As a further improvement of the present invention, a multi-layer sound-absorbing cylinder made of sound-absorbing material layers is concentrically arranged in the secondary sound-absorbing chamber. In the draw-in slot of the second support frame, the second support frame is fixed on the inner wall of the silencer body.

As a further improvement of the present invention, the multi-layer sound-absorbing cylinders are arranged at intervals.

Through the above technical solutions:

The beneficial effects of the present invention are: the sound-absorbing material layer and the interval form an annular multi-stage sound-absorbing channel, and when passing through the channel between the sound-absorbing material layers, it can absorb sound waves, thereby better absorbing sound wave energy, and completely absorbing sound waves in the gas .

The beneficial effects of this program are:

1. The multi-stage continuous noise reduction device of the present invention adopts a detour at the noise inlet to reduce the energy in the noise in the first stage, and then enters into a perforated pipe with one end closed, and several sound-absorbing holes are arranged on the wall of the perforated pipe , the perforated tube is provided with a sound-absorbing chamber, the gas passes through the sound-absorbing hole to weaken the sound wave energy in the second stage, and then enters the sound-absorbing chamber, reducing the pressure and flow rate of the gas. After the gas expands, the sound wave is absorbed by the glass in the sound-absorbing chamber. The fiber absorbs in the third stage, and after absorption, the gas with sound waves enters the annular multi-stage channel made of glass fibers, and the sound waves are shunted and absorbed in the fourth stage, and the multi-stage absorption method is adopted to improve the device's ability to absorb sound waves in the gas. for effective absorption.

2. The staggered arrangement of the silencing holes on the perforated pipe of the multi-stage continuous silencing device of the present invention can improve the turbulence effect of the gas when it comes out of the silencing holes, improve the dispersion of the air flow, reduce the collision resonance between the gases, and further improve the The sound-absorbing effect of the sound-absorbing device.

3. The perforated tube of the multi-stage continuous muffler of the present invention is provided with a helical turbulence fin around the inner wall, so that the gas path that passes straight through is changed into a vortex-shaped path, and the vortex-shaped path passes through the perforated tube The sound-absorbing holes on the top change the direction of the gas to different directions, and at the same time, the sound wave energy in the gas is dispersed, reflected in different directions, and cancel each other out, further improving the sound-absorbing effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a structural schematic diagram of a multi-stage continuous noise reduction device of the present invention.

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A in Fig. 1 .

Fig. 3 is a schematic diagram of the positions where the sound-absorbing holes are distributed on the perforated pipe.

Fig. 4 is a schematic structural view of the spoiler fins in the perforated tube of the present invention.

In the figure, 1. Silencer body, 2. Air inlet, 3. Air outlet, 4. Primary anechoic chamber, 5. Secondary anechoic chamber, 6. Perforated tube, 7. Sound-absorbing material layer, 8. Cross support frame , 9, spoiler, 10, silencer holes, 11, spoiler fins, 12, partition ring, 13, center hole, 14, gas expansion chamber, 15, multi-layer sound-absorbing cylinder.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment 1: Referring to Figures 1-2, the present invention provides a multi-stage continuous noise reduction device, including a silencer body 1, an air inlet 2 disposed at the bottom of the silencer body 1, and an air outlet disposed at the top of the silencer body 1 3. The first-level anechoic chamber 4 and the second-level anechoic chamber 5 arranged inside the muffler body 1, the first-level anechoic chamber 4 and the second-level anechoic chamber 5 are connected, and the first-level anechoic chamber 4 is provided with a The gas port 2 is connected to the perforated pipe 6 , and the sound-absorbing material layer 7 is arranged in the secondary sound-absorbing chamber 5 along the inner wall of the sound-absorbing cylinder body 1 .

Specifically, the primary anechoic chamber 4 and the secondary anechoic chamber 5 are separated by a cross support frame 8 .

Specifically, the primary anechoic chamber 4 includes a spoiler 9, a perforated pipe 6 and a partition ring 12, and the spoiler 9 is set at a position corresponding to the direction of the air inlet 2 for changing the flow direction of the gas at the air inlet 2 , the perforated pipe 6 is provided with several muffler holes 10 along the axial and circumferential direction of the pipe wall, one end of the perforated pipe 6 is closed, the other end is open, the closed end is fixedly connected with the cross support frame 8, and the open end faces At the bottom of the silencer body 1, the partition ring 12 is an annular plate-shaped structure with a central hole 13 in the middle, and the open end of the perforated pipe 6 passes through the center hole 13 and extends to the bottom of the silencer body 1. The partition ring 12 The outer wall of the center hole 13 is fixedly connected to the inner wall of the muffler body 1, and the inner wall of the central hole 13 is fixedly connected to the outer wall of the perforated pipe 6. The partition ring 12 is arranged on the side where the air inlet 2 is away from the bottom of the muffler body 1, and the perforated pipe 6 The outer wall, the cross support frame 8 , the partition ring 12 and the inner wall of the muffler body 1 form a gas expansion chamber 14 , and a sound-absorbing material layer 7 is arranged on the inner wall of the muffler body 1 in the gas expansion chamber 14 .

Referring to Fig. 3, specifically, the wall of the perforated pipe 6 in the axial direction from the cross support frame 8 to the partition ring 12 is provided with a number of sound-absorbing holes 10 uniformly distributed along the circumferential direction of the perforated pipe 6, and the sound-absorbing holes 10 are arranged in a staggered manner.

Specifically, a multi-layer sound-absorbing cylinder 15 made of sound-absorbing material layer 7 is concentrically arranged in the secondary anechoic chamber 5, and one end of the multi-layer sound-absorbing cylinder 15 is clamped in the slot of the cross support frame 8, and the other end is clamped Connected in the draw-in slot of the support frame 2, the support frame 2 is fixed on the inner wall of the sound-absorbing cylinder body 1, and the multi-layer sound-absorbing cylinders 15 are arranged at intervals.

The working principle of this scheme is: at the noise inlet, the energy in the noise is reduced in the first stage by means of detours, and then enters into the perforated pipe 6 with one end closed. The wall of the perforated pipe 6 is provided with several sound-absorbing holes 10, The perforated tube 6 is provided with a sound-absorbing chamber. The gas passes through the sound-absorbing holes 10 to weaken the energy of the sound wave in the second stage and then guides it into the sound-absorbing chamber, reducing the pressure and flow rate of the gas. After the gas expands, the sound wave is absorbed by the sound-absorbing chamber. The glass fiber is absorbed in the third stage, and the gas with sound waves after absorption enters the annular multi-stage channel made of glass fibers, and the sound waves are shunted and absorbed in the fourth stage. Sound waves are effectively absorbed.

Embodiment 2: Referring to Fig. 4, the inner wall of the perforated tube 6 is provided with spoiler fins 11 that spiral around the inner wall, so that the gas path that passes straight through is changed into a vortex-shaped path, and the gas path that forms the vortex-shaped path passes through the perforated tube The sound-absorbing hole 10 on the 6 changes the direction of the gas into different directions, and at the same time, the sound wave energy in the gas is dispersed and reflected in different directions to cancel each other out, further improving the sound-absorbing effect.

The flexible and telescopic spreader provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation modes of the present invention, and the descriptions of the above examples are only used to help understand the methods and core ideas of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. a kind of continuous silencing means of multistage, it is characterised in that: including hush pipe ontology (1), be set to hush pipe ontology (1) bottom The air inlet (2) in portion and the gas outlet (3) being set at the top of hush pipe ontology (1) are set to the one of hush pipe ontology (1) inside Grade anechoic chamber (4) and second level anechoic chamber (5), the level-one anechoic chamber (4) are connected with second level anechoic chamber (5), and the level-one disappears The perforated pipe (6) being connected with air inlet (2) is provided in tone chamber (4), along hush pipe ontology in the second level anechoic chamber (5) (1) inner wall direction is provided with sound-absorbing material layer (7).

2. the continuous silencing means of multistage according to claim 1, it is characterised in that: the level-one anechoic chamber (4) and second level It is mutually separated between anechoic chamber (5) by cross supporting frame (8).

3. the continuous silencing means of multistage according to claim 1, it is characterised in that: the level-one anechoic chamber (4) includes disturbing Flowing plate (9), the spoiler (9) are arranged with air inlet (2) to corresponding position, for changing the flow direction of air inlet (2) gas.

4. the continuous silencing means of multistage according to claim 2, it is characterised in that: axis of the perforated pipe (6) along tube wall To with offer several bloops (10) in circumferential direction, perforated pipe (6) it is closed at one end, the other end opens wide, closed One end is fixedly connected with cross supporting frame (8), and open one end is towards hush pipe ontology (1) bottom.

5. the continuous silencing means of multistage according to claim 4, it is characterised in that: be arranged on perforated pipe (6) inner wall Have around the spiral flow-disturbing fin (11) of inner wall.

6. according to the continuous silencing means of multistage as claimed in claim 3 to 5, it is characterised in that: it further include diaphragm rings (12), The diaphragm rings (12) are annular plate-like structure, and centre is provided with centre bore (13), and perforated pipe (6) open one end passes through center Hush pipe ontology (1) bottom is stretched in hole (13), and the outer wall of the diaphragm rings (12) is fixedly connected with hush pipe ontology (1) inner wall, Centre bore (13) inner wall is fixedly connected with the outer wall of perforated pipe (6), and diaphragm rings (12) setting is in air inlet (2) far from noise reduction The side at cylinder ontology (1) cylinder bottom.

7. the continuous silencing means of multistage according to claim 6, it is characterised in that: perforated pipe (6) outer wall, cross-shaped Support (8), diaphragm rings (12) and hush pipe ontology (1) inner wall constitute gas expansion chamber (14), in the gas expansion chamber (14) Sound-absorbing material layer (7) are provided on the inner wall of hush pipe ontology (1).

8. the continuous silencing means of multistage according to claim 5, it is characterised in that: perforated pipe (6) axial direction by Several bloops (10) circumferentially uniformly distributed along perforated pipe (6), institute are offered on cross supporting frame (8) to the tube wall of diaphragm rings (12) It is staggered to state bloop (10).

9. the continuous silencing means of multistage according to claim 2, it is characterised in that: in the second level anechoic chamber (5) with one heart It is provided with the multiple layer sound suction cylinder (15) being prepared by sound-absorbing material layer (7), multiple layer sound suction cylinder (15) one end is connected to ten In the card slot of word support frame (8), the other end is connected in the card slot of support frame two, and support frame two is fixed on hush pipe ontology (1) Inner wall on.

10. the continuous silencing means of multistage according to claim 8, it is characterised in that: the multiple layer sound suction cylinder (15) it Between be spaced setting.