A kind of chemical equipment pipeline exhaust filtering silencer

Abstract

The application relates to the technical field of chemical equipment, and particularly provides an exhaust filtering and silencing device for a pipeline of a chemical equipment, which comprises a main body and an end cover, the lower end of the main body is provided with an air inlet pipe, and the side end is provided with an exhaust pipe; first and second installation plates are arranged in the main body, the first and second installation plates divide the inside of the main body into a silencing chamber, a filtering chamber and an exhaust chamber from bottom to top, the air inlet pipe is connected to the silencing chamber, and the exhaust pipe is connected to the exhaust chamber; the main body is simultaneously provided with a silencing structure, a main filtering structure and an auxiliary filtering structure; the silencing structure can disperse the impact force of the airflow through spherical convex blocks, the triangular ring can guide the circulation of the vortex flow, and the noise can be effectively reduced; the main filtering structure and the auxiliary filtering structure are designed in cooperation, the standby filter can be seamlessly switched, the main filter element can be replaced without stopping, the auxiliary filtering structure can directly replace the auxiliary filter element through an external door plate, and the replacement and maintenance are convenient and fast.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical equipment, in particular to an exhaust filtering and silencing device for a pipeline of a chemical equipment. BACKGROUND

[0002] Chemical waste gas refers to toxic and harmful gas discharged by a chemical plant in chemical production. The chemical waste gas often contains many types of pollutants, and the physical and chemical properties are complex, and the toxicity is not the same, which seriously pollutes the environment and affects human health, and a large amount of noise is generated when the gas is discharged. Therefore, the chemical waste gas needs to be treated before being discharged, which requires the use of a filtering and silencing device.

[0003] A disclosed Chinese patent with the publication number CN213528108U discloses an exhaust filtering and silencing device for a pipeline of a chemical equipment, which comprises a box body, an acoustic layer is arranged on the outer side of the box body, a baffle is arranged in the box body, first and second filter screens are slidingly installed on the two sides of the box body, an air inlet is arranged on the top of the box body, an air outlet is arranged on the bottom of the box body, a first rotating rod is rotatably installed on the inner wall of one side of the air outlet, a handle is fixedly installed on one end of the first rotating rod, a first bevel gear is fixedly installed on the other end of the first rotating rod, a second bevel gear is engaged with the first bevel gear, and a second rotating rod is fixedly installed on the second bevel gear. The disclosed patent adopts a sliding filter screen and a manual driving structure, but the filter element needs to be replaced during shutdown operation, which affects the continuity of production. A disclosed Chinese patent with the publication number CN107349697A discloses an environmentally friendly exhaust filtering and silencing device for a pipeline of a chemical equipment, which comprises a pipe body, the pipe body comprises an outer pipe body, an acoustic layer and an inner pipe body, a fixed flange is arranged on one end of the pipe body, a first flange is arranged in the inner sleeve of one end of the pipe body close to the fixed flange, a second flange is arranged on the other end of the pipe body, an acoustic pipe is fixedly connected to the other end face of the second flange, support plates are symmetrically arranged on the left and right sides of the inner cavity of the pipe body, air holes are arranged on the support plates, the deepest part of the air holes is connected to a communication hole in a penetrating mode, a purification pipe is connected between the two support plates in a penetrating mode, and a first filter screen, a second filter screen, a filtering device and a catalytic reaction device are arranged in the pipe cavity of the purification pipe from left to right. The disclosed patent realizes purification through a multi-layer filtering structure, but the filtering unit is fixed and has no standby passage, and the whole device needs to be shut down for maintenance when it is blocked, and the silencing only relies on the acoustic layer, and the noise suppression of the airflow impact is insufficient. SUMMARY

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present application is to provide a chemical equipment pipeline exhaust filtering and silencing device, by providing a sound attenuation structure in the sound attenuation chamber, the spherical convex block of the sound attenuation structure can buffer and disperse the impact force of the airflow rushing into the air pipe, reducing the noise source intensity; the triangular ring inclined surface of the sound attenuation structure can cooperate with the spherical convex block to guide and disperse the airflow to form a vortex circulation in the sound attenuation chamber, prolonging the sound attenuation path and improving the noise reduction effect; by simultaneously providing a main filtering structure and an auxiliary filtering structure in the filtering chamber, the auxiliary filtering structure can continue filtering operation when the main filtering structure is blocked, which is specifically manifested as follows: when the main filter core is blocked, the third through hole is misaligned with the second through hole of the outer shell to close the main passage by driving the inner shell to rotate; the airflow pressure difference pushes the baffle of the auxiliary filtering structure to move upwards, opening the fourth through hole, and automatically switching to auxiliary filter core filtering, which facilitates the staff to clean or replace the main filter core without stopping the machine; to solve the problem that the filter core needs to be replaced and the production process is interrupted when the filtering structure is blocked in the prior art, and the sound attenuation structure is not optimized for airflow dynamics, resulting in insufficient noise suppression.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a chemical equipment pipeline exhaust filtering and silencing device, comprising a main body and an end cover fitted on the upper end of the main body, the lower end of the main body is provided with an air inlet pipe, and the side end is provided with an exhaust pipe;

[0006] The first mounting plate and the second mounting plate divide the inside of the main body into a sound attenuation chamber, a filtering chamber and an exhaust chamber from bottom to top, the air inlet pipe is connected to the sound attenuation chamber, and the exhaust pipe is connected to the exhaust chamber;

[0007] The main body is simultaneously provided with a sound attenuation structure, a main filtering structure and an auxiliary filtering structure, the sound attenuation structure is mounted in the sound attenuation chamber through the first mounting plate;

[0008] The main filtering structure and the auxiliary filtering structure are both mounted in the filtering chamber through the second mounting plate;

[0009] The sound attenuation structure comprises a connecting pipe and a spherical convex block, the upper end of the connecting pipe is connected to the filtering chamber after penetrating through the first mounting plate, and the spherical convex block is connected to the lower end of the connecting pipe;

[0010] The side end of the connecting pipe is annularly provided with a first through hole;

[0011] The spherical surface end of the spherical convex block corresponds to the position directly above the air inlet pipe, and the exhaust gas entering the main body through the air inlet pipe contacts and buffers the spherical convex block and is dispersed by the airflow;

[0012] The sound attenuation structure further comprises a triangular ring with an inclined surface end, the triangular ring is mounted at the lower end of the first mounting plate, and the inclined surface end of the triangular ring corresponds to the position above the outer side of the edge of the spherical convex block;

[0013] The main filter structure comprises an outer shell, an inner shell and a main filter core, the upper end of the outer shell is connected with the exhaust chamber through the second mounting plate, the inner shell is rotatably fitted in the outer shell, and the main filter core is fitted in the inner shell.

[0014] The side end of the outer shell is provided with a second through hole.

[0015] The side end of the inner shell is provided with a third through hole, and the third through hole and the second through hole are staggered.

[0016] The device further comprises a rotary driving structure, the rotary driving structure comprises a driving motor, a gear and a gear ring, the driving motor is mounted on the upper end of the second mounting plate through a support, the gear is sleeved on the output end of the driving motor, and the gear ring is sleeved on the upper end of the inner shell.

[0017] The auxiliary filter structure comprises a second outer shell, a second inner shell and an auxiliary filter core, the upper end of the second outer shell is connected with the exhaust chamber through the second mounting plate, the second inner shell is mounted on the inner upper end of the second outer shell, and the auxiliary filter core is fitted in the second inner shell.

[0018] The lower end of the second outer shell is provided with a fourth through hole connected to the filter chamber.

[0019] The side end of the second inner shell is provided with a fifth through hole.

[0020] In an embodiment of the present application, the upper end of the inner shell extends to the upper end of the second mounting plate, a clamping column is arranged outside the shell body of the inner shell extending to the upper end of the second mounting plate, the upper end of the second mounting plate is provided with two groups of C-shaped clamping seats vertically distributed, and the clamping column is rotatably clamped in one group of C-shaped clamping seats.

[0021] In an embodiment of the present application, the lower end of the second inner shell is connected with a spring, the lower end of the spring is connected with a baffle, and the baffle is elastically pressed against the inner lower end of the second outer shell provided with the fourth through hole.

[0022] In an embodiment of the present application, the side end of the second outer shell away from the main filter structure extends to the outside through the side end of the main body, and a claspable door plate is fitted on the outer side end of the second outer shell.

[0023] In an embodiment of the present application, the side end of the main body is further provided with an inflation back flushing pipe connected to the exhaust chamber.

[0024] As described above, the exhaust filtering and silencing device for chemical equipment pipelines has the following beneficial effects:

[0025] 1. This invention provides a sound-absorbing structure in the sound-absorbing chamber. The spherical protrusions of the sound-absorbing structure can buffer and disperse the impact force of the airflow rushing into the trachea, thereby reducing the intensity of the noise source. The triangular ring inclined surface of the sound-absorbing structure can work with the spherical protrusions to guide the dispersed airflow to form a vortex circulation in the sound-absorbing chamber, extending the sound-absorbing path and improving the noise reduction effect.

[0026] 2. This invention simultaneously sets up a main filter structure and an auxiliary filter structure in the filter chamber. The auxiliary filter structure can continue filtration when the main filter structure is blocked. Specifically, when the main filter element is blocked, the inner shell is driven to rotate, causing the third through hole to be misaligned with the second through hole of the outer shell, thus blocking the main passage. The airflow pressure difference pushes the baffle of the auxiliary filter structure to move upward, opening the fourth through hole and automatically switching to auxiliary filter element filtration. This allows the operator to clean or replace the main filter element without stopping the machine. The door panel of the auxiliary filter structure is external, which facilitates the replacement and maintenance of the auxiliary filter element without stopping the machine.

[0027] 3. This invention, by setting a locking post on the inner shell of the main filter structure and setting two sets of C-shaped locking seats on the second mounting plate, and cooperating with the rotary drive structure to provide drive, can realize the automatic switching locking design between the locking post and the two sets of C-shaped locking seats, so that the inner shell and the outer shell can achieve two working positions of alignment / misalignment through the through hole, which facilitates the automatic switching of the conduction or cut-off state of the main filter structure.

[0028] 4. By setting up an air-filled backflush pipe, the present invention can inject high-pressure gas into the exhaust chamber to backflush the main filter element and the auxiliary filter element, thereby reducing the frequency of filter blockage and improving the filtration efficiency.

[0029] 5. The noise reduction structure of this invention can disperse the impact force of the airflow through the spherical protrusions, and the triangular ring can guide the vortex circulation, effectively reducing noise; the cooperative design of the main filter structure and the auxiliary filter structure can seamlessly switch the backup filter and realize the replacement of the main filter element without stopping the machine; the auxiliary filter structure can directly replace the auxiliary filter element through the outer door panel, making replacement and maintenance convenient and quick; the design of the air backflush pipe can inject high-pressure gas to clean the main filter element and the auxiliary filter element in reverse, effectively reducing the frequency of filter element clogging. Attached Figure Description

[0030] Figure 1 The diagram shown is a schematic representation of the overall structure of the exhaust filtration and silencing device for chemical equipment pipelines disclosed in this invention.

[0031] Figure 2 The diagram shown is a cross-sectional structural schematic of the exhaust filtration and silencing device for chemical equipment pipelines disclosed in this invention.

[0032] Figure 3 Displayed as Figure 2 A magnified schematic diagram of the sound-absorbing structure and the sound-absorbing chamber working together to eliminate noise.

[0033] Figure 4 The figure shows the enlarged structure diagram of the sound attenuation structure in the exhaust filtering and sound attenuation device for chemical equipment pipeline disclosed by the present application.

[0034] Figure 5 The figure shows Figure 4 The figure shows the structure diagram from another perspective.

[0035] Figure 6 The figure shows Figure 2 The figure shows the enlarged structure diagram of the main filtering structure and the auxiliary filtering structure cooperating in the filtering chamber.

[0036] Figure 7 The figure shows the enlarged structure diagram of the main filtering structure and the rotating driving structure cooperating in the exhaust filtering and sound attenuation device for chemical equipment pipeline disclosed by the present application.

[0037] Figure 8 The figure shows the exploded structure diagram of the main filtering structure not being conducted in the exhaust filtering and sound attenuation device for chemical equipment pipeline disclosed by the present application.

[0038] Figure 9 The figure shows the exploded structure diagram of the main filtering structure being conducted in the exhaust filtering and sound attenuation device for chemical equipment pipeline disclosed by the present application.

[0039] Figure 10 The figure shows the enlarged structure diagram of the auxiliary filtering structure in the exhaust filtering and sound attenuation device for chemical equipment pipeline disclosed by the present application.

[0040] Figure 11 The figure shows Figure 10 The figure shows the structure diagram from another perspective.

[0041] Element number explanation

[0042] Body 1; end cover 2; air inlet pipe 3; exhaust pipe 4; sound attenuation structure 5; connecting pipe 51; first through hole 511; spherical convex block 52; triangular ring 53; main filtering structure 6; outer shell 61; second through hole 611; inner shell 62; third through hole 621; clamping column 622; main filter core 63; auxiliary filtering structure 7; second outer shell 71; fourth through hole 711; second inner shell 72; fifth through hole 721; auxiliary filter core 73; spring 74; baffle 75; door plate 76; rotating driving structure 8; driving motor 81; gear 82; gear ring 83; first mounting plate 9; second mounting plate 10; sound attenuation chamber 11; filtering chamber 12; exhaust chamber 13; air charging and back flushing pipe 14; C-shaped clamping seat 15; support 16; reserved filling pipe 17. DETAILED DESCRIPTION

[0043] The present application will be described in detail by specific embodiments, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application.

[0044] Please refer to Figures 1 to 11 It should be understood that the structure, proportion, size, etc. shown in the drawings attached to the present application are only used to illustrate the content disclosed in the present application for those skilled in the art to understand and read, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effects and purposes that the present application can produce, should fall within the scope of the technical content disclosed in the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present application are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0045] Please refer to Figure 1 The present application provides an exhaust filtering and silencing device for chemical equipment pipeline, which comprises a support 16, a main body 1 mounted on the support 16, and an end cap 2 fitted to the upper end of the main body 1. The lower end of the main body 1 is provided with an air inlet pipe 3, and the side end is provided with an exhaust pipe 4. The upper end of the end cap 2 is provided with a reserved feeding pipe 17, so as to add reagent to the exhaust of the chemical equipment pipeline under special conditions. The support 16 is arranged to enable the air inlet pipe 3 to be suspended relative to the ground equipment, facilitating the connection of the chemical equipment pipeline.

[0046] Please refer to Figure 2 The main body 1 is provided with a first mounting plate 9 and a second mounting plate 10, which divide the interior of the main body 1 from bottom to top into a silencing chamber 11, a filtering chamber 12, and an exhaust chamber 13. The air inlet pipe 3 is connected to the silencing chamber 11, and the exhaust pipe 4 is connected to the exhaust chamber 13. The main body 1 is also provided with a silencing structure 5, a main filtering structure 6, and an auxiliary filtering structure 7. The silencing structure 5 is mounted in the silencing chamber 11 through the first mounting plate 9. The main filtering structure 6 and the auxiliary filtering structure 7 are both mounted in the filtering chamber 12 through the second mounting plate 10.

[0047] Please refer to Figures 3-5, specifically, the sound attenuation structure 5 includes a connecting pipe 51 and a spherical convex block 52, the upper end of the connecting pipe 51 is connected with the filtering chamber 12 after penetrating the first mounting plate 9, the spherical convex block 52 is connected at the lower end of the connecting pipe 51; the side end of the connecting pipe 51 is provided with a first through hole 511; the spherical end of the spherical convex block 52 corresponds to the upper side of the air inlet pipe 3, the exhaust gas entering the main body 1 through the air inlet pipe 3 is in contact with the spherical convex block 52 to be buffered and dispersed, so that the noise source intensity is reduced. The sound attenuation structure 5 further includes a triangular ring 53 with a bevel end, the triangular ring 53 is installed at the lower end of the first mounting plate 9, and the bevel end of the triangular ring 53 corresponds to the upper side of the outer side of the edge of the spherical convex block 52, the bevel of the triangular ring 53 of the sound attenuation structure 5 can guide the dispersed airflow to form a vortex circulation in the sound attenuation chamber 11 in cooperation with the spherical convex block 52, so that the sound attenuation path is prolonged and the noise reduction effect is improved.

[0048] Please refer to Figures 6-9 The main filtering structure 6 includes an outer shell 61, an inner shell 62 and a main filter core 63, the upper end of the outer shell 61 is connected with the exhaust chamber 13 after penetrating the second mounting plate 10, the inner shell 62 is rotatably matched in the outer shell 61, and the main filter core 63 is matched in the inner shell 62; the side end of the outer shell 61 is provided with a second through hole 611; the side end of the inner shell 62 is provided with a third through hole 621, the third through hole 621 and the second through hole 611 can be staggered, and the working state of the main filtering structure 6 can be switched by adjusting the conduction state of the third through hole 621 and the second through hole 611.

[0049] Please refer to Figures 10-11The auxiliary filter structure 7 comprises a second outer shell 71, a second inner shell 72 and an auxiliary filter core 73, the upper end of the second outer shell 71 is connected with the exhaust chamber 13 after penetrating the second mounting plate 10, the second inner shell 72 is arranged at the upper end inside the second outer shell 71, and the auxiliary filter core 73 is matched in the second inner shell 72; the lower end of the second outer shell 71 is provided with a fourth through hole 711 connected to the filter chamber 12; the side end of the second inner shell 72 is provided with a fifth through hole 721; the lower end of the second inner shell 72 is connected with a spring 74, the lower end of the spring 74 is connected with a baffle 75, the baffle 75 is elastically pressed against the lower end inside the second outer shell 71 provided with the fourth through hole 711; when the pressure inside the filter chamber 12 is in a normal state, that is, the main filter structure 6 is in a normal filtering conduction state, the spring 74 presses the baffle 75 to block the fourth through hole 711, at this time, the auxiliary filter structure 7 is in a standby state; when the main filter core 63 is blocked, the pressure inside the filter chamber 12 increases, and the airflow pressure difference pushes the baffle 75 of the auxiliary filter structure 7 to move upwards, opens the fourth through hole 711, and automatically switches to the auxiliary filter core 73 for filtering. The side end of the second outer shell 71 away from the main filter structure 6 extends to the outside through the side end of the main body 1, the openable and closable door plate 76 is matched on the outside end of the second outer shell 71, the door plate 76 is externally arranged, and the auxiliary filter core 73 can be conveniently replaced and maintained in a non-stop state.

[0050] The auxiliary filter structure 7 can continue the filtering operation when the main filter structure 6 is blocked, which is specifically shown as follows: when the main filter core 63 is blocked, the third through hole 621 is misaligned with the second through hole 611 of the outer shell 61 to close the main passage by driving the inner shell 62 to rotate; the airflow pressure difference pushes the baffle 75 of the auxiliary filter structure 7 to move upwards, opens the fourth through hole 711, and automatically switches to the auxiliary filter core 73 for filtering, so that the staff can conveniently clean or replace the main filter core in a non-stop state; the door plate 76 of the auxiliary filter structure 7 is externally arranged, and the auxiliary filter core 73 can be conveniently replaced and maintained in a non-stop state.

[0051] Please refer to Figures 8-9The upper end of the inner shell 62 extends to the upper end of the second mounting plate 10, and a clamping column 622 is arranged outside the shell at the position where the inner shell 62 extends to the upper end of the second mounting plate 10. The upper end of the second mounting plate 10 is provided with two groups of vertically distributed C-shaped clamping seats 15, and the clamping column 622 can be rotatably clamped into one of the two groups of C-shaped clamping seats 15. The device further comprises a rotary driving structure 8, which comprises a driving motor 81, a gear 82 and a tooth ring 83. The driving motor 81 is mounted on the upper end of the second mounting plate 10 through a support, the gear 82 is sleeved on the output end of the driving motor 81, and the tooth ring 83 is sleeved on the upper end of the inner shell 62. The driving motor 81 can drive the gear 82 to rotate, so that the tooth ring 83 connected with the gear 82 drives the inner shell 62 to rotate and switch the conduction state relative to the outer shell 61.

[0052] According to the present application, the clamping column 622 and the two groups of C-shaped clamping seats 15 are arranged on the inner shell 62 of the main filter structure 6 and the second mounting plate 10 respectively, and the rotary driving structure 8 is provided to drive. The automatic switching clamping design of the clamping column 622 and the two groups of C-shaped clamping seats 15 is realized, so that the inner shell 62 and the outer shell 61 are aligned or misaligned through the through hole, and the conduction or cutoff state of the main filter structure 6 is automatically switched.

[0053] The side end of the main body 1 is further provided with an inflation back flushing pipe 14, which is communicated to the exhaust chamber 13. In actual use, the outer end of the inflation back flushing pipe 14 is connected to a high-pressure gas pump through a pipeline. The high-pressure gas injected by the high-pressure gas pump can clean the main filter core 63 and the auxiliary filter core 73 in reverse direction, thereby effectively reducing the frequency of filter core blockage.

[0054] The working process of the present application is as follows: the pipeline exhaust of chemical equipment enters the sound attenuation chamber 11 from the air inlet pipe 3, the spherical convex block 52 of the sound attenuation structure buffers and disperses the impact force of the air flow, reduces the noise source intensity; the inclined surface of the triangular ring 53 can cooperate with the spherical convex block 52 to guide the dispersed air flow to form vortex circulation in the sound attenuation chamber 11, and prolong the sound attenuation path; the air flow after sound attenuation in the sound attenuation chamber 11 passes through the first through hole 511 of the connecting pipe 51 and enters the filter chamber 12, when the pressure inside the filter chamber 12 is in a normal state, that is, the main filter structure 6 is in a normal filtering conduction state, the exhaust flow is moderate, the spring 74 presses the baffle 75 to block the fourth through hole 711, at this time the auxiliary filter structure 7 is in standby state; when the main filter core 63 is blocked or the exhaust flow is large, the pressure inside the filter chamber 12 increases, the air flow pressure difference pushes the baffle 75 of the auxiliary filter structure 7 to move upwards, opens the fourth through hole 711, and automatically switches to the auxiliary filter core 73 to guide the filtering state; if the main filter core 63 is blocked, at this time the main filter core 63 can be cleaned by injecting high-pressure gas through the air charging backflush pipe 14, if the main filter core 63 is blocked seriously, the third through hole 621 is adjusted to be not conductive with the second through hole 611 by rotating the driving structure 8 to drive the inner shell 62 to rotate, and the clamping column 622 is clamped into another group of C-shaped clamping seat 15, at this time the main filter core 63 can be replaced without stopping; the air flow filtered by the filter chamber 12 enters the exhaust chamber 13 through the filter core, and is discharged from the exhaust pipe 4.

[0055] In summary, the sound attenuation structure 5 provided by the present application can disperse the impact force of the air flow through the spherical convex block 52, and the triangular ring 53 can guide the vortex circulation, effectively reducing the noise; the cooperation design of the main filter structure 6 and the auxiliary filter structure 7 can seamlessly switch to standby filtering, and realize the non-stop replacement of the main filter core 63; the auxiliary filter structure 7 can directly replace the auxiliary filter core 73 through the external door plate 76, and the replacement and maintenance are convenient and fast; the design of the air charging backflush pipe 14 can inject high-pressure gas to reversely clean the main filter core 63 and the auxiliary filter core 73, effectively reducing the frequency of filter core blockage. Therefore, the present application effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0056] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An exhaust filtering and silencing device for chemical plant pipeline, comprising a main body (1) and an end cover (2) fitted on the upper end of the main body (1), the lower end of the main body (1) is provided with an air inlet pipe (3), and the side end is provided with an exhaust pipe (4); a first mounting plate (9) and a second mounting plate (10) are arranged in the main body (1), the first mounting plate (9) and the second mounting plate (10) divide the inside of the main body (1) into a silencing chamber (11), a filtering chamber (12) and an exhaust chamber (13) from bottom to top, the air inlet pipe (3) is communicated to the silencing chamber (11), and the exhaust pipe (4) is communicated to the exhaust chamber (13); the main body (1) is simultaneously provided with a silencing structure (5), a main filtering structure (6) and an auxiliary filtering structure (7), the silencing structure (5) is arranged in the silencing chamber (11) through the first mounting plate (9); the main filtering structure (6) and the auxiliary filtering structure (7) are arranged in the filtering chamber (12) through the second mounting plate (10); the silencing structure (5) comprises a connecting pipe (51) and a spherical lug (52), the upper end of the connecting pipe (51) is communicated to the filtering chamber (12) after penetrating through the first mounting plate (9), and the spherical lug (52) is connected to the lower end of the connecting pipe (51); first through holes (511) are arranged around the side end of the connecting pipe (51); the spherical end of the spherical lug (52) is above the air inlet pipe (3) in correspondence, exhaust gas entering the main body (1) through the air inlet pipe (3) is in contact with the spherical lug (52) for buffering and is dispersed by airflow; the silencing structure (5) further comprises a triangular ring (53) with a bevel end, the triangular ring (53) is arranged at the lower end of the first mounting plate (9), and the bevel end of the triangular ring (53) is above the edge outer side of the spherical lug (52) in correspondence; the main filtering structure (6) comprises an outer shell (61), an inner shell (62) and a main filter core (63), the upper end of the outer shell (61) is communicated to the exhaust chamber (13) after penetrating through the second mounting plate (10), the inner shell (62) is rotatably fitted in the outer shell (61), and the main filter core (63) is fitted in the inner shell (62); second through holes (611) are arranged around the side end of the outer shell (61); third through holes (621) are arranged around the side end of the inner shell (62), and the third through holes (621) and the second through holes (611) are staggered; the device further comprises a rotary driving structure (8), the rotary driving structure (8) comprises a driving motor (81), a gear (82) and a gear ring (83), the driving motor (81) is arranged on the upper end of the second mounting plate (10) through a support, the gear (82) is sleeved on the output end of the driving motor (81), and the gear ring (83) is sleeved on the upper end of the inner shell (62); the auxiliary filtering structure (7) comprises a second outer shell (71), a second inner shell (72) and an auxiliary filter core (73), the upper end of the second outer shell (71) is communicated to the exhaust chamber (13) after penetrating through the second mounting plate (10), the second inner shell (72) is arranged at the inner upper end of the second outer shell (71), and the auxiliary filter core (73) is fitted in the second inner shell (72). characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The lower end of the second outer shell (71) is provided with a fourth through hole (711) communicating with the filtering chamber (12); The side end of the second inner shell (72) is provided with a fifth through hole (721).

2. The exhaust filtering and muffling device for chemical plant piping according to claim 1, characterized in that: The upper end of the inner shell (62) extends to the upper end of the second mounting plate (10), and a clamping column (622) is arranged outside the shell body extending to the upper end of the second mounting plate (10), and the upper end of the second mounting plate (10) is provided with two groups of vertically distributed C-shaped clamping seats (15), and the clamping column (622) is rotatably clamped into one of the C-shaped clamping seats (15).

3. The exhaust filtering and muffling device for chemical plant piping according to claim 1, characterized in that: The lower end of the second inner shell (72) is connected with a spring (74), the lower end of the spring (74) is connected with a baffle (75), and the baffle (75) is elastically pressed against the inner lower end of the second outer shell (71) provided with the fourth through hole (711).

4. The exhaust filtering and muffling device for chemical plant piping according to claim 1, characterized by: The side end of the second outer shell (71) away from the main filtering structure (6) extends to the outside through the side end of the main body (1), and a closable door plate (76) is arranged on the outer side end of the second outer shell (71).

5. The exhaust filtering and muffling device for chemical plant piping according to claim 1, characterized by: The side end of the main body (1) is also provided with an inflation back flushing pipe (14) communicating with the exhaust chamber (13).

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