Porous laminated coupling type foam sound absorption pneumatic atomization dust settling device

Abstract

A porous laminated coupling type foam sound absorption pneumatic atomization dust settling device comprises a supersonic atomization noise reduction nozzle assembly and a noise reduction and sound absorption cover assembly. The noise reduction and sound absorption cover assembly is fixedly installed at the spraying end of the supersonic atomization noise reduction nozzle assembly. The supersonic atomization noise reduction nozzle assembly comprises a shell, a porous foam metal spray head, a cap, a water storage inner cylinder, a water drawing probe and the like. The noise reduction and sound absorption cover assembly comprises a mounting base, a plurality of sleeve supports and an annular sound absorption layer. Water sprayed out of the water drawing probe directly enters the supersonic flow field, the water can be directly broken into liquid drops with the diameter smaller than 5 micrometers in the supersonic flow field, the atomization effect and the coverage area of micron-sized fog drops are improved in the low-pressure and low-energy-consumption state, and the penetration distance of the fog field reaches 10 m; the noise reduction and sound absorption cover assembly makes full use of an annular laminated sound absorption structure, sound waves can be further reflected and scattered for multiple times in the noise reduction and sound absorption cover assembly, sound wave energy is rapidly attenuated, and the spray noise loudness at the position 2 m in the propagation direction is reduced to 69.2 dB.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust reduction and noise reduction, and particularly relates to a porous laminated coupled foam sound-absorbing pneumatic atomization dust reduction device. Background Art

[0002] Although traditional supersonic atomizing nozzles have the advantages of high spray concentration, small droplet size, fast movement speed, etc. and are widely used in the field of dust reduction, when using supersonic atomizing nozzles for dust reduction operations, strong noise will be generated, and the noise is mainly concentrated in the frequency band of 500 Hz to 8000 Hz, and the loudness can be as high as 103.6 dB, thus generating high-frequency noise pollution in the working environment and seriously threatening the health of workers.

[0003] Currently, the technical routes to solve the above high-frequency noise pollution mainly include structural design optimization, acoustic liners, mufflers, active noise control, and acoustic metamaterials, but each of these technical routes has some deficiencies.

[0004] When adopting the technical route of structural design optimization, although the noise can be reduced from the source, and it also has the characteristics of high efficiency and low cost, there are also problems of high design complexity, and it also needs to be combined with fluid mechanics simulation and experimental verification, resulting in a high implementation difficulty for this technical route.

[0005] When adopting the technical route of acoustic liners, although it has the ability to reduce high-frequency noise in the range of 500 Hz to 5000 Hz, there is also the problem of high maintenance cost.

[0006] When adopting the technical route of mufflers, although it has a significant noise reduction effect, the resistance to the atomizing air flow is the most obvious, which will have a negative impact on the dust reduction effect of atomization.

[0007] When adopting the technical route of active noise control, although it has a good noise reduction effect on low-frequency noise, the noise reduction effect on high-frequency noise is extremely poor.

[0008] When adopting the technical route of acoustic metamaterials, it can only produce a noise reduction effect on low-frequency noise, cannot meet the noise reduction requirements of high-frequency noise, and there is also the problem of high manufacturing cost. Summary of the Invention

[0009] Aiming at the problems existing in the prior art, the present invention provides a porous laminated coupled foam sound-absorbing pneumatic atomization dust reduction device, which can achieve efficient noise reduction of high-frequency noise while efficiently reducing dust, and realizes synergistic noise reduction on the two routes of source suppression and propagation path blocking, effectively meeting the consideration of atomization dust reduction and sound absorption noise reduction, and at the same time having the characteristics of simple structure, low manufacturing and maintenance costs.

[0010] To achieve the above object, the present invention adopts the following technical solutions: A porous laminated coupled foam sound-absorbing pneumatic atomization dust-removing device, comprising a supersonic atomization noise reduction nozzle assembly and a noise reduction and sound absorption cover assembly; the noise reduction and sound absorption cover assembly is fixedly installed at the spraying end of the supersonic atomization noise reduction nozzle assembly.

[0011] The supersonic atomization noise reduction nozzle assembly includes a housing, a porous foam metal spray head, a cap, a water storage inner cylinder and a water suction probe; the housing adopts a cylindrical structure, a water storage inner cylinder mounting hole is opened at the center of the top end plate of the housing, the bottom of the housing is an open structure, and an external thread is provided on the outer surface of the open bottom of the housing; the cap adopts a cylindrical structure, a spray through hole is opened at the center of the bottom end plate of the cap, the top of the cap is an open structure, and an internal thread is provided on the inner surface of the open top of the cap, and the open top of the cap is threadedly connected to the open bottom of the housing; the porous foam metal spray head is pressed and fixed between the cap and the housing, and a Laval channel is opened at the center of the porous foam metal spray head; the water storage inner cylinder adopts a cylindrical structure, a water inlet is opened at the center of the top end plate of the water storage inner cylinder, and an internal thread is provided on the inner surface of the water inlet; a water outlet is opened at the center of the bottom end plate of the water storage inner cylinder, the upper end of the water suction probe is hermetically fixed in the water outlet, the lower end of the water suction probe extends into the Laval channel, and the water suction probe and the Laval channel are coaxially distributed; a plurality of air inlets are uniformly distributed along the circumference on the housing below the water storage inner cylinder mounting hole; a limiting retaining ring is provided in the middle and upper part of the barrel of the water storage inner cylinder, and a plurality of centering support blocks are uniformly fixed along the circumference on the bottom side surface of the water storage inner cylinder, and the centering support blocks are in contact with the top of the housing.

[0012] A first sealing ring is provided between the limiting retaining ring and the housing; a second sealing ring is provided between the porous foam metal spray head and the cap; a third sealing ring is provided between the housing and the cap.

[0013] The material of the porous foam metal spray head includes but is not limited to porous foam aluminum, porous foam stainless steel, porous foam copper, and the pore diameter of the porous foam is 30μm to 80μm.

[0014] The noise reduction and sound absorption cover assembly includes a mounting base, a first sleeve bracket, a second sleeve bracket, a third sleeve bracket, a fourth sleeve bracket, a first annular sound absorption layer and a second annular sound absorption layer; the mounting base adopts a disc-shaped structure, a transfer round hole is provided at the center of the mounting base, an internal thread is provided on the inner surface of the transfer round hole, an external thread is provided on the outer surface of the cap, and the mounting base is threadedly connected with the cap through the transfer round hole; the first sleeve bracket, the second sleeve bracket, the third sleeve bracket and the fourth sleeve bracket are coaxially distributed from inside to outside and are fixedly connected to the lower surface of the mounting base through a slot structure; the inner cavity of the first sleeve bracket serves as a spray passage cavity; the first annular sound absorption layer is arranged in the circumferential space between the first sleeve bracket and the second sleeve bracket; the second annular sound absorption layer is arranged in the circumferential space between the third sleeve bracket and the fourth sleeve bracket; an annular cavity is formed between the second sleeve bracket and the third sleeve bracket.

[0015] The wall structures of the first sleeve bracket, the second sleeve bracket, the third sleeve bracket and the fourth sleeve bracket all adopt a grid keel type wall structure.

[0016] The materials of the first annular sound absorption layer and the second annular sound absorption layer include but are not limited to polyester fiber cotton, aerogel, glass wool, rock wool, ceramic cotton, and melamine cotton.

[0017] Advantages of the present invention:

[0018] The porous laminated coupling type foam sound absorption pneumatic atomization dust reduction device of the present invention can achieve efficient noise reduction of high-frequency noise while efficiently reducing dust, and realizes synergistic noise reduction on two routes of source suppression and propagation path blocking, effectively meeting the requirements of both atomization dust reduction and sound absorption noise reduction, and at the same time having the characteristics of simple structure, low manufacturing and maintenance costs. Description of the drawings

[0019] Figure 1 It is a schematic structural diagram of a porous laminated coupling type foam sound absorption pneumatic atomization dust reduction device of the present invention;

[0020] Figure 2 It is a schematic structural diagram of a supersonic atomization noise reduction nozzle assembly of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the noise reduction and sound absorption cover assembly of the present invention;

[0022] In the figure, I is a supersonic atomizing noise reduction nozzle assembly, II is a noise reduction and sound absorption cover assembly, 1 is a housing, 2 is a porous foam metal nozzle, 3 is a cap, 4 is an inner water storage cylinder, 5 is a water suction probe, 6 is a mounting hole for the inner water storage cylinder, 7 is a spray passage hole, 8 is a Laval channel, 9 is a water inlet, 10 is a water outlet, 11 is an air inlet, 12 is a limiting retaining ring, 13 is a centering support block, 14 is a first sealing ring, 15 is a second sealing ring, 16 is a third sealing ring, 17 is a mounting seat, 18 is a first sleeve bracket, 19 is a second sleeve bracket, 20 is a third sleeve bracket, 21 is a fourth sleeve bracket, 22 is a first annular sound absorption layer, 23 is a second annular sound absorption layer, 24 is a transfer round hole, 25 is a spray passage cavity, 26 is an annular cavity. Detailed implementation mode

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] As Figures 1 to 3 shown, a porous laminated coupled foam sound absorption pneumatic atomizing dust suppression device includes a supersonic atomizing noise reduction nozzle assembly I and a noise reduction and sound absorption cover assembly II; the noise reduction and sound absorption cover assembly II is fixedly installed at the spray end of the supersonic atomizing noise reduction nozzle assembly I.

[0025] The supersonic atomizing noise reduction nozzle assembly I includes a housing 1, a porous foam metal nozzle 2, a cap 3, an inner water storage cylinder 4 and a water suction probe 5; the housing 1 adopts a cylindrical structure, a mounting hole 6 for the inner water storage cylinder is opened at the center of the top end plate of the housing 1, the bottom of the housing 1 is an open structure, and an external thread is provided on the outer surface of the open bottom of the housing 1; the cap 3 adopts a cylindrical structure, a spray passage hole 7 is opened at the center of the bottom end plate of the cap 3, the top of the cap 3 is an open structure, and an internal thread is provided on the inner surface of the open top of the cap 3, and the open top of the cap 3 is threadedly connected to the open bottom of the housing 1; the porous foam metal nozzle 2 is pressed and fixed between the cap 3 and the housing 1, and a Laval channel 8 is opened at the center of the porous foam metal nozzle 2; the inner water storage cylinder 4 adopts a cylindrical structure, a water inlet 9 is opened at the center of the top end plate of the inner water storage cylinder 4, and an internal thread is provided on the inner surface of the water inlet 9; a water outlet 10 is opened at the center of the bottom end plate of the inner water storage cylinder 4, the upper end of the water suction probe 5 is hermetically fixed in the water outlet 10, the lower end of the water suction probe 5 extends into the Laval channel 8, and the water suction probe 5 and the Laval channel 8 are coaxially distributed; a plurality of air inlets 11 are evenly distributed circumferentially on the housing 1 below the mounting hole 6 for the inner water storage cylinder; a limiting retaining ring 12 is provided in the middle and upper part of the barrel of the inner water storage cylinder 4, and a plurality of centering support blocks 13 are evenly fixed circumferentially on the bottom side surface of the inner water storage cylinder 4, and the centering support blocks 13 are in contact with the top of the housing 1.

[0026] A first sealing ring 14 is provided between the limit retaining ring 12 and the housing 1; a second sealing ring 15 is provided between the porous foam metal spray head 2 and the cap 3; a third sealing ring 16 is provided between the housing 1 and the cap 3.

[0027] The material of the porous foam metal spray head 2 includes but is not limited to porous foam aluminum, porous foam stainless steel, and porous foam copper, and the pore diameter of the porous foam is 30 μm to 80 μm.

[0028] In this embodiment, the materials of the housing 1, the water storage inner cylinder 4, and the water suction probe 5 are all stainless steel. The number of air inlets 11 is set to four, the number of centering support blocks 13 is set to three, and the radial height is 5 mm. The circumferential clearance width between the water storage inner cylinder 4 and the housing 1 is also 5 mm; the material of the cap 3 is PA6 nylon, the outer diameter of the cap 3 is 29 mm, the axial length of the cap 3 is 37 mm, and the wall thickness of the cap 3 is 3.5 mm; the axial length of the Laval channel 8 is 25 mm, the large diameter end diameter of the converging section of the Laval channel 8 is 13 mm, the throat diameter of the Laval channel 8 is 3.5 mm, the large diameter end diameter of the diverging section of the Laval channel 8 is 7 mm, and the axial length of the Laval channel 8 is 13 mm.

[0029] The noise reduction and sound absorption cover assembly II includes a mounting seat 17, a first sleeve bracket 18, a second sleeve bracket 19, a third sleeve bracket 20, a fourth sleeve bracket 21, a first annular sound absorption layer 22, and a second annular sound absorption layer 23; the mounting seat 17 adopts a disc-shaped structure. A transfer round hole 24 is provided at the center of the mounting seat 17, an internal thread is provided on the inner surface of the transfer round hole 24, an external thread is provided on the outer surface of the cap 3, and the mounting seat 17 is threadedly connected to the cap 3 through the transfer round hole 24; the first sleeve bracket 18, the second sleeve bracket 19, the third sleeve bracket 20, and the fourth sleeve bracket 21 are coaxially distributed from the inside to the outside and are all fixedly connected to the lower surface of the mounting seat 17 through a slot structure; the inner cavity of the first sleeve bracket 18 serves as a spray passage cavity 25; the first annular sound absorption layer 22 is arranged in the circumferential space between the first sleeve bracket 18 and the second sleeve bracket 19; the second annular sound absorption layer 23 is arranged in the circumferential space between the third sleeve bracket 20 and the fourth sleeve bracket 21; an annular cavity 26 is formed between the second sleeve bracket 19 and the third sleeve bracket 20.

[0030] The wall surface structures of the first sleeve bracket 18, the second sleeve bracket 19, the third sleeve bracket 20, and the fourth sleeve bracket 21 all adopt a grid keel type wall surface structure.

[0031] The materials of the first annular sound absorption layer 22 and the second annular sound absorption layer 23 include but are not limited to polyester fiber cotton, aerogel, glass wool, rock wool, ceramic cotton, and melamine cotton.

[0032] In this embodiment, the first sleeve bracket 18, the second sleeve bracket 19, the third sleeve bracket 20, and the fourth sleeve bracket 21 are made of stainless steel, and their axial lengths are all 80 mm. The diameter of the spray passage 25 is 40 mm, the radial thickness of the annular cavity 26 is 5 mm, and the radial thicknesses of the first annular sound-absorbing layer 22 and the second annular sound-absorbing layer 23 are both 20 mm.

[0033] The following describes the first use process of the present invention with reference to the accompanying drawings:

[0034] First, a water supply pipe and a waterway adapter are successively connected between the water source and the water inlet 9, and sealing tape is wound around the threaded connection to ensure the sealing performance of the threaded connection. At the same time, an air supply pipe and an air path adapter are successively connected between the air compressor pump and the air inlet 11, and sealing tape is also wound around the threaded connection to ensure the sealing performance of the threaded connection.

[0035] After starting the air compressor pump, the compressed air first enters the circumferential gap between the water storage inner cylinder 4 and the housing 1 successively through the air supply pipe, the air path adapter, and the air inlet 11, and then passes through the three fan-shaped channels formed between the centering support blocks 13 and enters the Laval channel 8 at the center of the porous foam metal nozzle 2. When the compressed air first passes through the converging section of the Laval channel 8 and then passes through the throat of the Laval channel 8 and enters the diverging section, the air flow expands, and the air flow velocity will reach a supersonic flow state of 2 times the Mach number, and a stable strip-shaped supersonic flow field will be formed near the outlet of the water extraction probe 5 in the diverging section, that is, a negative pressure area lower than one standard atmospheric pressure is formed.

[0036] During this process, the expansion of the air flow, the friction between air flow layers with different speeds, the friction between the supersonic air flow and the inner wall surface of the Laval channel 8, and the generation and evolution of oblique shock waves and sonic rings are combined to form the sound source of high-frequency noise. Under the sound-absorbing effect of the porous foam metal nozzle 2, the high-frequency noise can effectively reduce the sound pressure level when propagating radially through the inner wall surface of the Laval channel 8, thus achieving the noise reduction purpose of source suppression.

[0037] When the water source is opened, since a negative pressure area will be formed near the outlet of the water extraction probe 5, under the action of the negative pressure, the water in the water source successively passes through the water supply pipe, the waterway adapter, the water inlet 9, and the water storage inner cylinder 4 and then directly enters the water extraction probe 5 and is ejected from its outlet. The ejected water will directly enter the internal supersonic flow field, and the water will be directly broken into droplets smaller than 5 μm in the internal supersonic flow field. Under the state of low pressure and low energy consumption, the atomization effect and coverage area of the micron-sized droplets are improved. Through experimental verification, the penetration distance of the fog field reaches 10 m, thus verifying the dust reduction effect of the present invention.

[0038] In this process, the noise reduction and sound absorption cover assembly II makes full use of the circumferential laminated sound absorption structure, which can further enable sound waves to be reflected and scattered multiple times within the noise reduction and sound absorption cover assembly II, thereby achieving rapid attenuation of the sound wave energy. Through experimental verification, the following results are obtained: the measured loudness of the spray noise at the sound source is 88.4 dB, and at a distance of 2 m in the propagation direction, the measured loudness of the spray noise is 69.2 dB, thus verifying the noise reduction effect of the present invention.

[0039] The solutions in the embodiments are not intended to limit the protection scope of the present invention. Any equivalent implementation or modification without departing from the present invention is included in the protection scope of the present invention.

Claims

1. A porous laminated coupled foam sound-absorbing pneumatic atomization dust suppression device, characterized in that: It comprises a supersonic atomizing noise reduction nozzle assembly and a noise reduction and sound absorbing cover assembly; the noise reduction and sound absorbing cover assembly is fixedly installed at the spray end of the supersonic atomizing noise reduction nozzle assembly.

2. The porous laminated coupled foam sound-absorbing pneumatic atomization dust suppression device according to claim 1, wherein: The supersonic atomizing noise reduction nozzle assembly includes a shell, a porous foam metal nozzle, a cap, a water storage inner cylinder and a water pumping probe; the shell adopts a cylindrical structure, a water storage inner cylinder through hole is opened at the center of the shell top end plate, the shell bottom is an open structure, and the shell bottom open outer surface is provided with an external thread; the cap adopts a cylindrical structure, a spray through hole is opened at the center of the cap bottom end plate, the cap top is an open structure, and the cap top open inner surface is provided with an internal thread, the top opening of the cap is threadedly connected with the bottom opening of the shell; the porous foam metal nozzle is pressed and fixed between the cap and the shell, and at the center of the porous foam metal nozzle A Laval cavity is provided; the water storage inner tube adopts a cylindrical tube structure, a water inlet is provided at the center of the top end plate of the water storage inner tube, and an internal thread is provided on the inner surface of the water inlet; a water outlet is provided at the center of the bottom end plate of the water storage inner tube, the upper end of the water pumping probe is sealed and fixed in the water outlet, the lower end of the water pumping probe extends into the Laval cavity, and the water pumping probe and the Laval cavity are coaxially distributed; a plurality of air inlets are evenly distributed along the circumferential direction on the shell below the through-hole of the water storage inner tube; a limit baffle ring is provided in the middle and upper part of the cylinder body of the water storage inner tube, and a plurality of centering support blocks are evenly fixed along the circumferential direction on the bottom side surface of the water storage inner tube, and the centering support blocks are in contact with the shell.

3. The porous laminated coupling type foam sound-absorbing pneumatic atomization dust suppression device according to claim 2, characterized in that: A first sealing ring is provided between the limit stop ring and the shell; a second sealing ring is provided between the porous foam metal nozzle and the cover cap; and a third sealing ring is provided between the shell and the cover cap.

4. The porous laminated coupled foam sound-absorbing pneumatic atomization dust-removing device according to claim 2, wherein: The material of the porous foam metal nozzle includes but is not limited to porous foam aluminum, porous foam stainless steel, and porous foam copper, and the pore size of the porous foam is 30 μm to 80 μm.

5. The porous laminated coupling type foam sound-absorbing pneumatic atomization dust reduction device according to claim 2, wherein: The noise reduction and sound absorbing cover assembly includes a mounting seat, a first sleeve bracket, a second sleeve bracket, a third sleeve bracket, a fourth sleeve bracket, a first annular sound absorbing layer and a second annular sound absorbing layer; the mounting seat adopts a disc-shaped structure, a transfer circular hole is provided at the center of the mounting seat, an internal thread is provided on the inner surface of the transfer circular hole, and an external thread is provided on the outer surface of the cap, and the mounting seat is threadedly connected with the cap through the transfer circular hole; the first sleeve bracket, the second sleeve bracket, the third sleeve bracket and the fourth sleeve bracket are coaxially distributed from the inside to the outside and are fixedly connected to the lower surface of the mounting seat through a slot structure; the inner cavity of the first sleeve bracket serves as a spray passage cavity; the first annular sound absorbing layer is arranged in the annular space between the first sleeve bracket and the second sleeve bracket; the second annular sound absorbing layer is arranged in the annular space between the third sleeve bracket and the fourth sleeve bracket; an annular cavity is formed between the second sleeve bracket and the third sleeve bracket.

6. The porous laminated coupled foam sound-absorbing pneumatic atomization dust-removing device according to claim 5, wherein: The wall structures of the first sleeve bracket, the second sleeve bracket, the third sleeve bracket and the fourth sleeve bracket all adopt a grid keel wall structure.

7. The porous laminated coupling type foam sound-absorbing pneumatic atomization dust suppression device according to claim 5, characterized in that: The materials of the first annular sound-absorbing layer and the second annular sound-absorbing layer include but are not limited to polyester fiber cotton, aerogel, glass wool, rock wool, ceramic wool, and melamine cotton.

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