CN217207040U

CN217207040U - Emptying silencer of magnetic suspension air blower for sewage treatment

Info

Publication number: CN217207040U
Application number: CN202123381427.5U
Authority: CN
Inventors: 安然; 李瑜; 王本义; 蔡雅琪; 高京生; 马维东
Original assignee: CRRC Dalian Institute Co Ltd
Current assignee: CRRC Dalian Institute Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-08-16
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a emptying silencer of a magnetic suspension blower for sewage treatment, which comprises an L-shaped silencing box main body, three silencing pipes and a silencing box top cover, wherein the L-shaped silencing box main body, the silencing pipes and the silencing box top cover are all provided with porous sound absorption structures, the L-shaped silencing box main body is separated into three silencing chambers through a silencing plate, the silencing pipes are respectively arranged in each silencing chamber, the two adjacent silencing pipes are vertically distributed in space, the silencing pipes are provided with silencing sides and air outlet sides, the air outlet side has the air outflow direction opposite to the direction of air flowing to the next chamber, the emptying silencer is compact in structure, is an integrated silencer, reduces the space occupation, simultaneously sets the silencing pipes to be vertically distributed in space, and radially vents air in an axial line, increases the reflection and interference of noise in the silencer, increases the propagation distance, thereby reducing noise, and does not cause surge when the pressure loss of the emptying air in and out of the blower, the size of the air outlet side is adjusted, and the adaptation of a blower without series is realized.

Description

Emptying silencer of magnetic suspension air blower for sewage treatment

Technical Field

The utility model relates to a sewage treatment technical field especially relates to a unloading silencer of magnetic suspension air-blower for sewage treatment.

Background

The main aeration mode used for sewage treatment equipment at present is blast aeration, and air is sent into an aeration tank through mechanical rotation of an impeller to provide oxygen for aerobic microorganisms; when the machine is started, shut down or in an emergency state, in order to avoid water flow backflow and other accidents caused by the fact that the outlet pressure does not reach a required value, the generated high-pressure gas needs to be discharged through an emptying bypass, high-frequency high noise generated in the process is generally larger than 110dB, noise pollution is caused to the environment, and the noise pollution is unacceptable to human ears; the air-blast device that is used for the aeration at present is mostly the magnetic suspension air-blower, external cylinder muffler commonly used, and there is the potential safety hazard in this type of muffler, reforms transform the in-process and exists and interfere the risk with other pipelines. The internal integrated emptying silencer only considers emptying sound absorption, and the internal integrated emptying silencer is mostly provided with parallel or staggered sound absorption plates and cannot adapt to series blowers with different air volume pressures; the main frame of built-in unloading silencer is mostly the rectangle, fails make full use of magnetic suspension air-blower rack inner space, and the outline is whole to be conventional panel, can't inhale the sound to the inside secondary of magnetic suspension air-blower, causes the space extravagant.

SUMMERY OF THE UTILITY MODEL

The utility model provides a unloading silencer for sewage treatment's magnetic suspension air-blower to overcome external bucket formula muffler and have the air-blower of the unable different blast volume pressures of adaptation of potential safety hazard and the inside integrated muffler that interfere with other pipelines and the extravagant technical problem in space.

In order to realize the purpose, the technical scheme of the utility model is that:

a blowdown muffler for a magnetic levitation blower for sewage treatment, comprising: l type amortization case main part, three hush pipe and hush box top cap, L type amortization case main part, hush pipe and hush box top cap all are equipped with porous sound absorbing structure L type amortization case main part falls into three hush room through two hush boards and is first hush room, second hush room and third hush room respectively, adjacent two communicate with each other in proper order between the hush room, and is three the hush pipe sets up respectively in the hush room, adjacent two be space vertical distribution between the hush pipe, the hush pipe includes amortization side and air outlet side, air outlet side gas outflow direction is opposite with the gas flow direction of the next hush room of flow direction L type amortization case main part top is passed through the hush box top cap is sealed, is equipped with the air inlet in the side of first hush room be equipped with the evacuation return bend of giving vent to anger on the hush box top cap.

Further, L type whistle box main part includes whistle box main body frame, inhales cotton porous guard plate of sound and three yielding rubber, and the whistle box main body frame outside is the perforated plate, the whistle box main body frame with inhale to fill between the cotton porous guard plate of sound and inhale the sound cotton the whistle box main body frame with the junction of hush pipe is equipped with yielding rubber.

Furthermore, the silencing pipes comprise a first silencing pipe, a second silencing pipe and a third silencing pipe, the air outlet side areas of the first silencing pipe and the second silencing pipe are larger than the air inlet area, and the first silencing pipe and the second silencing pipe are identical in structure;

the first silencing pipe comprises a silencing pipe perforated plate, silencing pipe rib plates and silencing pipe protective panels, wherein the silencing pipe rib plates are arranged at two ends of the silencing pipe perforated plate in a half-circle mode, the silencing pipe protective panels are arranged on the silencing pipe rib plates, sound-absorbing cotton is arranged between the silencing pipe perforated plate and the silencing pipe protective panels, and flange plates are arranged at two sides of the silencing pipe perforated plate;

the third silencing pipe comprises a silencing air inlet pipeline and a silencing air outlet pipeline, flange plates are arranged on both sides of the silencing air inlet pipeline and the silencing air outlet pipeline, the silencing air inlet pipeline is communicated with the silencing air outlet pipeline, the inner wall of the silencing air inlet pipeline is provided with an inner wall silencing pipe porous plate, the outer side of the inner wall silencing pipe porous plate is provided with a silencing pipe protective panel, sound-absorbing cotton is filled between the inner wall silencing pipe porous plate and the silencing pipe protective panel, the silencing air outlet pipeline comprises a non-porous inner wall and a porous inner wall, the non-porous inner wall is communicated with the porous inner wall, a porous outer wall is arranged on the outer side of the non-porous inner wall, a first chamber is formed between the porous outer wall and the non-porous inner wall, the outer side of the porous inner wall is provided with a silencing pipe guard plate, a second cavity is formed between the porous inner wall and the silencing pipe guard plate, and the first cavity is communicated with the second cavity.

Furthermore, a silencing cavity is formed between the silencing tube protective panel and the silencing tube porous plate, and the width of the silencing cavity is 20-50 mm.

Furthermore, the aperture of the porous plate of the silencing pipe is 3mm-10 mm.

Furthermore, the muffling box top cover comprises a top cover porous plate and a top cover sound insulation plate, the top cover porous plate and the top cover sound insulation plate are filled with sound absorption cotton, and the top cover sound insulation plate is provided with a communicating part for venting air of the third muffling chamber.

Furthermore, the silencing board comprises a silencing main board, a porous protection plate and a fixing plate, through holes are formed in the silencing main board and the porous protection plate, the silencing main board and the porous protection plate are filled with the sound absorption cotton, and the fixing plate connected with the L-shaped silencing main body is arranged at the bottom of the silencing main board.

Has the advantages that: the utility model provides a unloading silencer for sewage treatment's magnetic suspension air-blower has following beneficial effect:

1. the emptying silencer integrated with the inside of the magnetic suspension blower cabinet reduces the occupied space of the silencer;

2. the porous sound absorption structure is arranged in the sound absorption structure, the two adjacent sound absorption pipes are vertically distributed in a space, the gas outflow direction of the gas outlet side is opposite to the direction of the gas flowing to the next cavity, and the sound waves are transmitted in the porous sound absorption material or the sound absorption structure and the flow area is continuously expanded or contracted, so that the transmitted noise is attenuated, internally reflected and interfered along with the distance, and the pollution of harsh noise generated when compressed air is discharged into the atmosphere at high speed is reduced;

3. the utility model provides a hush pipe can be changed, satisfies under the gassing requirement condition at loss of pressure, through the gassing size of adjusting hush pipe perforated plate, realizes the adaptation to different series air-blowers, effectively reduces the fan and in the unloading stage and the exhaust stage conversion process because of the flow fluctuation that the pressure oscillation leads to it is minimum to export the wind speed of will gassing, and then reaches the purpose of unloading noise minimizing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic view of the overall structure of a venting muffler of a magnetic suspension blower for sewage treatment according to the present invention;

fig. 2 is a gas flow path diagram of an emptying silencer of a magnetic suspension blower for sewage treatment, which is disclosed by the utility model;

FIG. 3 is a top view of the main body of the L-shaped muffling box of the magnetic suspension blower for sewage treatment of the utility model;

fig. 4 is a schematic view of a first silencing tube structure of an emptying silencer of a magnetic suspension blower for sewage treatment, which is disclosed by the utility model;

FIG. 5 is a schematic structural view of a third muffler pipe of an emptying muffler of a magnetic suspension blower for sewage treatment according to the present invention;

FIG. 6 is a schematic structural view of a top cover of a silencing box of a emptying silencer of a magnetic suspension blower for sewage treatment;

FIG. 7 is a schematic structural view of a emptying muffler silencing plate of a magnetic suspension blower for sewage treatment disclosed by the utility model;

FIG. 8 is a sectional view of a muffler pipe of a magnetic suspension blower for sewage treatment according to the present invention;

in the figure: 1. an L-shaped silencing box body, 2, a silencing pipe, 3, a silencing box top cover, 4, a silencing plate, 5, a silencing chamber, 6, a silencing side, 7, an air outlet side, 8, an air inlet, 9, an air outlet bent pipe, 10, sound-absorbing cotton, 11, a flange plate, 101, a silencing box body frame, 102, a sound-absorbing cotton porous protection plate, 103, damping rubber, 21, a first silencing pipe, 22, a second silencing pipe, 23, a third silencing pipe, 211, a silencing pipe porous plate, 212, a silencing pipe rib plate, 213, a silencing pipe protection plate, 231, a silencing air inlet pipe, 2311, an inner wall silencing pipe porous plate, 232, a silencing air outlet pipe, 2321, a non-porous inner wall, 2322, a porous inner wall, 2323, a porous outer wall, 2324, a first chamber, 2325, a second chamber, 31, a top cover porous plate, 32, a top cover sound insulation plate, 41, a main plate, 42, a porous protection plate, 43, a fixing plate, 51, a first silencing chamber, 52. a second sound-deadening chamber, 53, a third sound-deadening chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment provides a emptying silencer of a magnetic suspension blower for sewage treatment, which comprises the following components in parts by weight as shown in figures 1 and 8: the L-shaped silencing box comprises an L-shaped silencing box body 1, three silencing tubes 2 and a silencing box top cover 3, wherein the L-shaped silencing box body 1, the silencing tubes 2 and the silencing box top cover 3 are all provided with porous sound absorption structures, the L-shaped silencing box body 1 is divided into three silencing chambers 5 through two silencing plates 4, namely a first silencing chamber 51, a second silencing chamber 52 and a third silencing chamber 53 respectively, two adjacent silencing chambers 5 are communicated in sequence, the three silencing tubes 2 are arranged in the silencing chambers 5 respectively, the two adjacent silencing tubes 2 are vertically distributed in space, each silencing tube 2 comprises a silencing side 6 and an air outlet side 7, the air outlet side 7 has an air outflow direction opposite to the air flowing direction flowing to the next silencing chamber, the top of the L-shaped silencing box body 1 is sealed through the silencing box top cover 3, the side of the first silencing chamber 51 is provided with an air inlet top cover 8, and the silencing box 3 is provided with an air outlet elbow 9, in this embodiment, the L-shaped sound-deadening box body 1, the sound-deadening tubes 2 and the sound-deadening box top cover 3 are all connected by bolts, so as to be convenient for disassembly and replacement, the L-shaped sound-deadening box body 1 is divided into three sound-deadening chambers 5 by two sound-deadening plates 4, the middle parts of the sound-deadening plates 4 are provided with through holes, so that the three sound-deadening chambers 5 are communicated with each other, the first sound-deadening chamber 51 is provided with an air inlet 8, the first sound-deadening tube 21 is communicated with the air inlet 8, the air outlet 7 of the first sound-deadening tube 21 is opposite to the air inlet side of the second sound-deadening tube 22, the air outlet 7 of the second sound-deadening tube 22 is opposite to the air inlet side of the third sound-deadening tube 23, finally, the vent gas is discharged from the air outlet of the third sound-deadening tube 23 and is discharged from the interior of the sound-deadening box through the vent elbow 9, the flow direction is all axial air inlet and radial air inlet, so as to effectively prolong the sound wave propagation distance, thereby realizing the attenuation of the propagated noise along with the distance, as shown in fig. 2, the vent gas is in the gas flow path of the silencer, so that the vent gas is propagated in the porous sound absorption structure in the silencer, and the flow area is continuously expanded or contracted, thereby realizing the attenuation, internal reflection and interference of the propagated noise along with the distance, reducing the pollution of harsh noise generated when the compressed air is discharged into the atmosphere at high speed, adjusting the air outlet measurement size of the muffler pipe 2, and controlling the pressure difference and flow between the air inlet 8 on the side surface of the first muffler chamber 51 and the vent air outlet elbow 9 on the top cover 3 of the muffler box by adjusting the size of the air outlet side of the muffler pipe 2, thereby realizing the adaptation to different blowers.

In a specific embodiment, as shown in fig. 3, the L-shaped muffler body 1 includes a muffler body frame 101, a porous protection plate 102 made of sound-absorbing cotton, and three damping rubbers 103, wherein the outside of the muffler body frame 101 is a porous plate, sound-absorbing cotton 10 is filled between the muffler body frame 101 and the porous protection plate 102 made of sound-absorbing cotton, the damping rubbers 103 are disposed at the connection between the muffler body frame 101 and the muffler pipe 2, the muffler body frame 101 and the porous protection plate 102 made of sound-absorbing cotton both have a pore diameter, the sound-absorbing cotton 10 is filled inside the muffler body frame 101 and the porous protection plate 102 made of sound-absorbing cotton, the cavity and the sound-absorbing material generated inside the vent muffler are used to perform secondary noise reduction inside the cabinet, so as to perform secondary noise reduction inside the muffler and also perform noise reduction inside the cabinet, the damping rubbers 103 are disposed at the connection between the muffler pipe 2 and the muffler body frame 101, for reducing the impact of the air flow on the overall frame 101 of the baffle box.

In a specific embodiment, the silencing pipe 2 comprises a first silencing pipe 21, a second silencing pipe 22 and a third silencing pipe 23, the area of the air outlet side of the first silencing pipe 21 and the area of the air inlet side of the second silencing pipe 22 are larger than that of the air inlet side of the first silencing pipe 21, and the first silencing pipe 21 and the second silencing pipe 22 are identical in structure;

as shown in fig. 4, the first muffler pipe 21 includes a muffler pipe porous plate 211, muffler pipe rib plates 212, and a muffler pipe guard plate 213, the muffler pipe rib plates 212 are disposed at two ends of the muffler pipe porous plate 211, the muffler pipe guard plate 213 is disposed on the muffler pipe rib plates 212, sound-absorbing cotton 10 is disposed between the muffler pipe porous plate 211 and the muffler pipe guard plate 213, flange plates 11 are disposed at two sides of the muffler pipe porous plate 211, and are connected to the muffler box main body frame 101 through the flange plates 11 at two sides, the sound-absorbing cotton 10 is filled between the muffler pipe porous plate 211 and the muffler pipe guard plate 213, sound energy is converted into heat energy by friction and dissipated, so that noise propagating along the pipeline is attenuated according to distance, the first muffler pipe 21 and the second muffler pipe 22 have the same structure, are both radial semi-open type pipelines, the air outlet side perforation rate should be enlarged as much as possible, and high-pressure vent gas is expanded through multiple cavities, reducing pressure, and realizing internal reflection or interference of the transmitted noise;

as shown in fig. 5, the third sound-absorbing pipe 23 includes a sound-absorbing inlet pipe 231 and a sound-absorbing outlet pipe 232, both sides of the sound-absorbing inlet pipe 231 and the sound-absorbing outlet pipe 232 are provided with flange plates 11, the sound-absorbing inlet pipe 231 is communicated with the sound-absorbing outlet pipe 232, an inner wall porous plate 2311 of the sound-absorbing inlet pipe 231 is provided on an inner wall of the sound-absorbing inlet pipe 231, a sound-absorbing pipe protection plate 213 is provided on an outer side of the inner wall porous plate 2311, sound-absorbing cotton 10 is filled between the inner wall porous plate 2311 and the sound-absorbing pipe protection plate 213, the sound-absorbing outlet pipe 232 includes a non-porous inner wall 2321 and a porous inner wall 2322, the non-porous inner wall 2321 is communicated with the porous inner wall 2322, a porous outer wall 2323 is provided on an outer side of the non-porous inner wall 2321, a first chamber 2324 is formed between the porous outer wall 2321 and the non-porous inner wall 2323, and a sound-absorbing pipe protection plate 213 is provided on an outer side of the porous inner wall 2322, a second chamber 2325 is formed between the porous inner wall 2322 and the muffler pipe guard plate 213, the first chamber 2324 is communicated with the second chamber 2325, the vent gas enters the silencing intake pipe 231, the sound absorbing cotton 10 around the silencing intake pipe 231 absorbs noise, the vent gas enters the second chamber 2325 on the porous inner wall 2322, the vent gas enters the first chamber 2324 and then enters the third silencing chamber 53 from the porous outer wall 2321 after entering the second chamber 2325, and finally the silencer is discharged from the venting outlet elbow 9, the outlet measurement area of the third silencing pipe 23 is not less than the inlet area, so that the outlet is expanded every time, and the noise is silenced through the reflection and intervention of sound waves caused by expansion.

In a specific embodiment, a silencing cavity is formed between the silencing tube protective panel 213 and the silencing tube porous plate 211, the width of the silencing cavity is 20mm-50mm, the width of the silencing cavity is the distance between the silencing tube protective panel 213 and the silencing tube porous plate 211, and is set to be 20mm-50mm, and the interior of the silencing cavity is filled with the sound absorption cotton 10, so that the sound absorption effect can be ensured.

In the specific embodiment, the aperture of the silencing tube porous plate 211 is 3mm-10mm, the perforation rate is not lower than 20%, and the pneumatic resistance of the emptying silencer is adjusted through the aperture to reduce the noise of the emptying air flow as much as possible.

In this embodiment, the perforated plate 211 of the silencer can be replaced, the plate thickness and the hole diameter of the perforated plate 211 of the silencer can be adjusted according to the internal wind speed of the silencer, when the internal wind speed is less than or equal to 12m/s, the perforated plate is resistive silencing, the plate thickness is 1.5mm-3mm, the hole diameter is 3mm-10mm, and the perforation rate is not lower than 20%; when the internal wind speed is more than 12m/s, the wind turbine is used for micro-hole noise reduction, the plate thickness is less than or equal to 1mm, the hole diameter is less than 1.0mm, and the perforation rate is between 1 and 10 percent, wherein the calculation method of the perforation rate comprises the following steps: n (D/D)2, wherein n is the number of the apertures on the porous plate of the silencing tube; d is the diameter of the aperture on the porous plate of the silencing pipe; d is the diameter of the silencing tube.

In a specific embodiment, as shown in fig. 6, the muffling box top cover 3 includes a top cover porous plate 31 and a top cover sound insulating plate 32, sound absorbing cotton 10 is filled between the top cover porous plate 31 and the top cover sound insulating plate 32, the top cover sound insulating plate 32 is provided with an emptying air outlet bent pipe 9 communicated with the third muffling chamber 53, and the muffling box top cover 3 is provided with sound absorbing cotton inside to absorb the noise of emptying air.

In a specific embodiment, as shown in fig. 7, the sound attenuation board 4 includes a sound attenuation main board 41, a porous protection board 42 and a fixing board 43, the sound attenuation main board 41 and the porous protection board 42 are all provided with through holes, the sound attenuation main board 41 and the porous protection board 42 are filled with the sound absorption cotton 10, the bottom of the sound attenuation main board 41 is provided with a fixing board 43 used for being connected with the L-shaped sound attenuation box main body 1, the sound attenuation main board 41 and the porous protection board 42 are both provided with apertures, the sound absorption cotton 10 is filled in the sound attenuation main board 41 and the porous protection board 42, sound absorption cavities on two sides of the sound attenuation board 4 can be absorbed, the sound attenuation board 4 is connected with the sound attenuation box main body frame 101 through the fixing board 43, and the sound attenuation board 4 is convenient to be detached and replaced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An emptying muffler of a magnetic suspension blower for sewage treatment, characterized by comprising: the L-shaped silencing box comprises an L-shaped silencing box body (1), three silencing tubes (2) and a silencing box top cover (3), wherein the L-shaped silencing box body (1), the silencing tubes (2) and the silencing box top cover (3) are all provided with porous sound absorbing structures, the L-shaped silencing box body (1) is divided into three silencing chambers (5) through two silencing plates (4), the three silencing chambers (5) are respectively a first silencing chamber (51), a second silencing chamber (52) and a third silencing chamber (53), two adjacent silencing chambers (5) are sequentially communicated, the three silencing tubes (2) are respectively arranged in the silencing chambers (5), the two adjacent silencing tubes (2) are vertically distributed in space, each silencing tube (2) comprises a silencing side (6) and an air outlet side (7), the air outlet side (7) has an air outflow direction opposite to the air flow direction of the next silencing chamber, and the top cover (3) is used for silencing at the top of the L-shaped silencing box body (1), an air inlet (8) is arranged on the side surface of the first silencing chamber (51), and an emptying air outlet bent pipe (9) is arranged on the silencing box top cover (3).

2. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 1 is characterized in that the L-shaped silencer main body (1) comprises a silencer main body frame (101), a sound-absorbing cotton porous protection plate (102) and three damping rubbers (103), porous plates are arranged on the outer side of the silencer main body frame (101), sound-absorbing cotton (10) is filled between the silencer main body frame (101) and the sound-absorbing cotton porous protection plate (102), and the damping rubbers (103) are arranged at the joint of the silencer main body frame (101) and the silencer pipe (2).

3. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 1, characterized in that the silencing pipe (2) comprises a first silencing pipe (21), a second silencing pipe (22) and a third silencing pipe (23), the area of the air outlet side of the first silencing pipe (21) and the area of the air inlet side of the second silencing pipe (22) are larger than that of the air inlet side of the first silencing pipe (21), and the first silencing pipe (21) and the second silencing pipe (22) are identical in structure;

the first silencing pipe (21) comprises a silencing pipe porous plate (211), silencing pipe rib plates (212) and silencing pipe guard plates (213), wherein the silencing pipe rib plates (212) are arranged at two ends of the silencing pipe porous plate (211), the silencing pipe guard plates (213) are arranged on the silencing pipe rib plates (212), sound-absorbing cotton (10) is arranged between the silencing pipe porous plate (211) and the silencing pipe guard plates (213), and flange plates (11) are arranged on two sides of the silencing pipe porous plate (211);

the third silencing pipe (23) comprises a silencing air inlet pipeline (231) and a silencing air outlet pipeline (232), flange plates (11) are arranged on two sides of the silencing air inlet pipeline (231) and the silencing air outlet pipeline (232), the silencing air inlet pipeline (231) is communicated with the silencing air outlet pipeline (232), an inner wall silencing pipe porous plate (2311) is arranged on the inner wall of the silencing air inlet pipeline (231), a silencing pipe guard plate (213) is arranged on the outer side of the inner wall silencing pipe porous plate (2311), sound absorbing cotton (10) is filled between the inner wall silencing pipe porous plate (2311) and the silencing pipe guard plate (213), the silencing air outlet pipeline (232) comprises a non-porous inner wall (2321) and a porous inner wall (2322), the non-porous inner wall (2321) is communicated with the porous inner wall (2322), and a porous outer wall (2323) is arranged on the outer side of the non-porous inner wall (2321), a first chamber (2324) is formed between the porous outer wall (2323) and the non-porous inner wall (2321), a silencing tube protection plate (213) is arranged on the outer side of the porous inner wall (2322), a second chamber (2325) is formed between the porous inner wall (2322) and the silencing tube protection plate (213), and the first chamber (2324) is communicated with the second chamber (2325).

4. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 3, wherein a silencing cavity is formed between the silencing tube guard plate (213) and the silencing tube porous plate (211), and the width of the silencing cavity is 20mm-50 mm.

5. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 3, characterized in that the aperture of the silencing tube porous plate (211) is 3mm-10 mm.

6. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 1, characterized in that the silencing box top cover (3) comprises a top cover porous plate (31) and a top cover sound insulation plate (32), sound absorption cotton (10) is filled between the top cover porous plate (31) and the top cover sound insulation plate (32), and an emptying air outlet bent pipe (9) communicated with the third silencing chamber (53) is arranged on the top cover sound insulation plate (32).

7. The emptying silencer of the magnetic suspension blower for sewage treatment according to claim 1, characterized in that the silencing plate (4) comprises a silencing main plate (41), a porous protection plate (42) and a fixing plate (43), through holes are arranged on both the silencing main plate (41) and the porous protection plate (42), sound-absorbing cotton (10) is filled in the silencing main plate (41) and the porous protection plate (42), and the fixing plate (43) used for being connected with the L-shaped silencing box main body (1) is arranged at the bottom of the silencing main plate (41).