CN213954006U - Sound cavity mode adjustable flue silencer - Google Patents
Sound cavity mode adjustable flue silencer Download PDFInfo
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- CN213954006U CN213954006U CN202022895779.1U CN202022895779U CN213954006U CN 213954006 U CN213954006 U CN 213954006U CN 202022895779 U CN202022895779 U CN 202022895779U CN 213954006 U CN213954006 U CN 213954006U
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Abstract
The utility model discloses a smoke duct silencer with an adjustable sound cavity mode, which comprises a wall shell, a motor actuator and a deflection silencing sheet; the wall shell is annular, and openings at two ends of the wall shell are respectively a flue gas inlet and a flue gas outlet; the motor actuator is arranged outside the wall shell, and an output shaft of the motor actuator extends into the wall shell; the deflection silencing sheet is fixed on the output shaft and positioned in the wall shell, and can rotate around the output shaft under the driving action of the output shaft so as to adjust the angle. The angle of the deflection silencing sheet in the use process is adjustable, the effect of adjusting the sound cavity mode can be achieved, the sound cavity mode is ensured to be matched with the peak frequency section of a noise source of the draught fan and a pipeline, the resonance intensity of the silencing sheet in the vertical direction is enhanced, the sound absorption efficiency of the silencing sheet is greatly improved, and the problems that the existing silencer cannot be matched with the silencing effect caused by the frequency section migration of the vibration peak value of the outlet of the draught fan and the service life is reduced can be solved.
Description
Technical Field
The utility model relates to a mechanical industry technical field, more specifically say, relate to a sound chamber mode adjustable flue silencer.
Background
The industrial flue gas treatment is an important subject in the field of atmospheric environmental protection, the flue gas emission noise mainly occurs from an induced draft fan to an outlet section of a chimney, the noise type of the flue gas emission noise is divided into structural noise and fluid noise, the structural noise is mainly mechanical vibration of an induced draft fan body and an adjacent flue, and the fluid noise comprises induced draft fan outlet flue gas pulsation noise, turbulence flutter and fast flow noise; the structural noise is isolated and treated from the noise source through the arrangement of the induced draft fan room, and the fluid noise is attenuated and absorbed by additionally arranging a silencer on a smoke air duct.
The silencer for the outlet flue gas duct of the induced draft fan in the existing flue gas purification process mainly adopts a fixed assembled silencing sheet for silencing, and the silencing sheet is of a micro-perforated plate type silencing sheet structure.
The research direction of the silencer mainly expands around two aspects of the shape and the arrangement mode of the silencing sheet, the silencing efficiency of the silencer is improved as much as possible, and the specific design method of the silencer is to design the structural parameters of the silencer according to the peak frequency band of the outlet noise of the induced draft fan, so that the noise is attenuated and absorbed in the silencer to the maximum extent.
However, the noise peak frequency band can be shifted along with the working condition change of the induced draft fan in the using process, the abrasion fault of the induced draft fan and the like, the resonance noise elimination performance of the noise elimination sheet is reduced due to the shift, the noise elimination effect is influenced, and the problem that the service life of the silencer is not good in the flue gas purification industry is caused.
In summary, how to provide a smoke duct silencer suitable for different noise peak frequency bands of an induced draft fan is an urgent problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a flue silencer of sound chamber modal adjustable, its angularly adjustable of the inside noise damping piece that deflects in the use reaches the effect of adjustment sound chamber modal, ensures that sound chamber modal and draught fan and pipeline noise source peak frequency phase match, improves the life of noise cancelling effect and this flue silencer.
In order to achieve the above object, the utility model provides a following technical scheme:
a smoke duct muffler with an adjustable acoustic cavity mode, comprising:
the wall casing is annular, and openings at two ends of the wall casing are respectively a flue gas inlet and a flue gas outlet;
the motor actuator is arranged outside the wall shell, and an output shaft of the motor actuator extends into the wall shell;
the deflection silencing piece is fixed on the output shaft and is positioned in the wall shell, and the deflection silencing piece can rotate around the output shaft under the driving action of the output shaft so as to adjust the angle.
Preferably, in the above-described flue gas duct muffler, a plurality of output shafts of the motor actuator are provided, and each of the output shafts is attached to the wall shell so as to be rotatable about its own axis; and different deflection silencing sheets are respectively assembled on each output shaft.
Preferably, in the above flue gas duct silencer, the motor actuator further includes a motor, the motor is mounted to the wall casing through a motor mounting flange, and the motor drives the output shafts to rotate around their axes at the same angular speed through a crank link mechanism.
Preferably, in the above flue muffler, the crank mechanism includes:
the cranks are fixed on the output shafts and correspond to the output shafts one by one;
two ends of the connecting rod are respectively hinged with the two different cranks; the number of the connecting rods is less than 1 than that of the cranks, and each connecting rod connects all the output shafts in sequence;
wherein the shaft of the motor is connected with one of the output shafts.
Preferably, the above-mentioned flue duct silencer further comprises a pointer and a scale plate, the pointer is fixed to the output shaft, and the scale plate is fixed to the wall casing.
Preferably, in the above-mentioned flue gas duct silencer, the output shafts are sequentially arranged along a direction from the flue gas inlet to the flue gas outlet of the wall casing, and the axes of the output shafts are respectively arranged along a direction perpendicular to the direction from the flue gas inlet to the flue gas outlet; the axes of all output shafts lie in the same plane.
Preferably, in the above flue gas duct muffler, the number of the motor actuators is plural, and the motor actuators are sequentially arranged along a first direction; the first direction is perpendicular to the direction from the smoke inlet to the smoke outlet and perpendicular to the axis of the output shaft in the motor actuator.
Preferably, in the above flue silencer, a bearing seat is installed on the outer side of the wall shell; each output shaft penetrates through the wall shell, and two ends of each output shaft are assembled on bearing seats on two sides of the wall shell respectively.
Preferably, the silencer for the flue gas duct further comprises a fixed silencing sheet, the fixed silencing sheet is fixed in the wall casing, and the plate surface of the fixed silencing sheet is parallel to the direction from the flue gas inlet to the flue gas outlet.
Preferably, in the above flue gas duct silencer, the silencing sheet includes a galvanized sheet outer wall and a sound absorbing material layer, the two side plate surfaces of the galvanized sheet outer wall are respectively provided with small holes, and an accommodating cavity is formed inside the galvanized sheet outer wall; the sound absorption material layer is fixed in the containing cavity, and gaps are respectively reserved between the sound absorption material layer and the two side plate surfaces of the outer wall of the galvanized sheet.
The utility model provides a smoke duct silencer with an adjustable sound cavity mode, which comprises a wall shell, a motor actuator and a deflection silencing sheet; the wall shell is annular, and openings at two ends of the wall shell are respectively a flue gas inlet and a flue gas outlet; the motor actuator is arranged outside the wall shell, and an output shaft of the motor actuator extends into the wall shell; the deflection silencing sheet is fixed on the output shaft and positioned in the wall shell, and can rotate around the output shaft under the driving action of the output shaft so as to adjust the angle.
The utility model provides a smoke wind channel silencer is in the use, the angularly adjustable of its inside noise damping piece that deflects, can reach the effect of adjustment sound chamber mode, ensure that sound chamber mode and draught fan and pipeline noise source peak frequency phase match, strengthen the resonance intensity of noise damping piece vertical direction, greatly improve the sound absorption efficiency of noise damping piece, can solve the problem that current silencer can't match the noise elimination effect that draught fan export vibration peak frequency range migration arouses and life reduces.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a flue gas duct muffler with an adjustable acoustic cavity mode according to an embodiment of the present invention;
fig. 2 is a schematic side view of a smoke duct muffler with an adjustable acoustic cavity mode according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a motor actuator according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an acoustic elimination sheet provided by an embodiment of the present invention;
fig. 5 is a schematic structural view of a deflection noise-reduction sheet according to an embodiment of the present invention in a horizontal posture;
fig. 6 is a schematic structural view of a deflection noise-reduction sheet provided in an embodiment of the present invention, which forms an included angle with the horizontal direction;
fig. 7 is a schematic structural diagram of the muffler plate in different motor actuators 1 according to the embodiment of the present invention when included angles between the muffler plate and the horizontal direction are different;
wherein, in fig. 1-7:
a motor actuator 1; a wall housing 2; fixing the silencing sheet 3; a deflection noise-canceling sheet 4; a motor 5; a motor mounting flange 6; a scale plate 7; a connecting rod 8; a crank 9; a bearing housing 10; an outer wall 01 of a galvanized sheet; a layer of sound absorbing material 02.
Detailed Description
The embodiment of the utility model discloses sound chamber mode adjustable flue silencer, its inside angularly adjustable that deflects noise elimination piece in the use reaches the effect of adjustment sound chamber mode, ensures that sound chamber mode and draught fan and pipeline noise source peak frequency section match, improves the life of noise cancelling effect and this flue silencer.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-7, an embodiment of the present invention provides a smoke duct silencer with an adjustable acoustic cavity mode, which includes a wall casing 2, a motor actuator 1, and a deflection silencing sheet 4; the wall casing 2 is annular, and openings at two ends of the wall casing 2 are respectively a flue gas inlet and a flue gas outlet; the wall shell 2 is used for butt joint with a smoke air duct; the motor actuator 1 is arranged outside the wall shell 2, and an output shaft of the motor actuator 1 extends into the wall shell 2; the deflection noise elimination sheet 4 is fixed on the output shaft and is positioned in the wall shell 2, and the deflection noise elimination sheet 4 can rotate around the output shaft under the driving action of the output shaft so as to adjust the angle.
The smoke air duct silencer that this embodiment provided is in the use, its inside angle of the silencing piece 4 that deflects can reach the effect of adjustment sound cavity mode, ensure that sound cavity mode and draught fan and pipeline noise source peak frequency phase match, strengthen the resonance intensity of silencing piece vertical direction, greatly improve the sound absorption efficiency of the silencing piece 4 that deflects, can solve the problem that current silencer can't match the silencing effect and the life reduction that draught fan export vibration peak frequency range migration arouses.
Specifically, in the above-mentioned flue gas duct silencer, the output shafts of the motor actuator 1 are plural, and each output shaft can be installed on the wall casing 2 around its own axis; each output shaft is fitted with a different deflection muffler plate 4. A bearing seat 10 is arranged on the outer side of the wall shell 2; each output shaft is respectively penetrated through the wall casing 2, and both ends of each output shaft are respectively assembled at the bearing seats 10 at both sides of the wall casing, as shown in fig. 1.
The motor actuator 1 comprises a motor 5 besides an output shaft, the motor 5 is assembled on the wall shell 2 through a motor mounting flange 6, and the motor 5 drives the output shafts to rotate around the axes of the output shafts at the same angular speed through a crank link mechanism.
The motor 5 is one and is a stepping motor.
In the smoke duct silencer provided by the embodiment, the motor 5 can simultaneously drive the output shafts to rotate at the same angular speed, so that the angle of the deflection silencing sheet 4 on each output shaft can be adjusted simultaneously, the adjustment efficiency is improved, and the structure is simplified.
In above-mentioned flue silencer, crank link mechanism includes:
the cranks 9 are fixed on the output shafts, and the cranks 9 correspond to the output shafts one by one (namely, the cranks 9 are the same as the output shafts in number, each output shaft is respectively fixed with one crank 9, and each crank 9 is respectively fixed on different output shafts);
two ends of the connecting rod 8 are respectively hinged with two different cranks 9; the number of the connecting rods 8 is 1 less than that of the cranks 9, and each connecting rod 8 connects all the output shafts in sequence;
wherein the shaft of the motor 5 is connected to an output shaft.
When the crank-connecting rod mechanism is used, the shaft of the motor drives the output shaft connected with the motor to rotate around the axis of the motor, and the output shaft drives all the rest output shafts to rotate at the same angular speed through the crank-connecting rod mechanism.
In order to facilitate the user to observe and control the rotation angle of the output shaft, the smoke duct silencer provided in the above embodiment further includes a pointer fixed on the output shaft and a scale plate 7, where the scale plate 7 is fixed on the wall casing 2 (specifically, on a bearing seat 10 installed on the wall casing 2), as shown in fig. 2 and 3.
The scale plate 7 is arc-shaped and is marked with angle scales.
Specifically, in the motor actuator 1 of the flue gas duct silencer, the output shafts are sequentially arranged along the direction from the flue gas inlet to the flue gas outlet of the wall casing 2, and the axes of the output shafts are respectively arranged along the direction perpendicular to the direction from the flue gas inlet to the flue gas outlet; the axes of all output shafts lie in the same plane.
The number of the motor actuators 1 is multiple, and the motor actuators 1 are sequentially arranged along a first direction; the first direction is perpendicular to the direction from the flue gas inlet to the flue gas outlet, and the first direction is perpendicular to the axis of the output shaft in the motor actuator 1.
Preferably, the silencer of the flue gas duct further comprises a fixed silencing sheet 3, the fixed silencing sheet 3 is fixed in the wall casing 2, and the surface of the fixed silencing sheet 3 is parallel to the direction from the flue gas inlet to the flue gas outlet.
The fixed silencing sheet 3 is welded on the inner wall of the wall shell 2 and can be arranged in 1 or more number, and the fixed silencing sheet 3 divides the inner space of the wall shell 2 into a plurality of parts.
An output shaft through hole is arranged at the position, corresponding to the output shaft, on the fixed silencing sheet 3. The outer wall surface of the wall shell 2 is provided with a heat insulation layer, and the inner wall surface is provided with a sound absorption material layer.
In the silencer for the smoke duct provided by the above embodiment, the fixed silencing piece 3 and the deflection silencing piece 4 are respectively a microperforated plate type silencing piece, and the concrete structure is as follows:
the sound absorption material comprises a galvanized thin plate outer wall 01 and a sound absorption material layer 02, wherein small holes with the hole diameter d are respectively formed in two side plate surfaces of the galvanized thin plate outer wall 01, and an accommodating cavity is formed in the galvanized thin plate outer wall 01; the sound absorbing material layer 02 is fixed in the accommodating cavity, and gaps t are respectively arranged between the sound absorbing material layer and the two side plate surfaces of the outer wall of the galvanized sheet, as shown in fig. 4.
In the silencing sheet, a gap space cavity between the sound-absorbing material layer 02 and the outer wall 01 of the galvanized sheet and a small hole of the outer wall 01 of the galvanized sheet form a resistant silencing structure of the silencing sheet, and the built-in sound-absorbing material layer 02 is the resistant sound-absorbing structure of the silencing sheet.
The present embodiment provides three different types of combined cases of the deflection muffling sheet 4:
firstly, all the deflection noise elimination sheets 4 are horizontally arranged, namely the inclination angle is 0 degrees, as shown in figure 5;
all the deflection silencing pieces 4 rotate clockwise by a certain angle as shown in figure 6;
and thirdly, the deflection noise elimination sheets 4 in different motor actuators 1 rotate by a certain angle in different clockwise directions, as shown in fig. 7.
The combination mode of the three different deflection angles forms a plurality of internal sound cavity structures of the silencer, so that the frequency of the sound cavity is changed.
When the silencer is in work, the shaft of the motor 5 of the motor actuator 1 rotates, all output shafts of the motor actuator 1 are driven to rotate through the crank-link mechanism, then the deflection angles of all deflection silencing pieces 4 connected with the output shafts are controlled, each motor actuator 1 respectively adjusts the deflection angle of the deflection silencing piece 4 matched with the motor actuator, the shape of a sound cavity in the silencer can be changed, the modal change of the sound cavity in the silencer is finally realized, the modal frequency of the sound cavity is adjusted to be close to the peak frequency range of fan noise, the noise particle resonance in the silencer is increased, and the silencing effect of the silencer is enhanced.
In a specific experiment, the angles of the acoustic sheets are respectively 0 degree, 15 degrees and 30 degrees, vibration mode frequency points of the acoustic cavity of the silencer along the vertical direction of the acoustic sheets are respectively 34.23Hz, 69.96Hz and 86.43Hz through simulation, and the result shows that the mode of the acoustic cavity of the silencer is changed to a large extent, so that the resonance noise elimination performance of the silencer in a low frequency range can be influenced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a flue silencer of sound chamber mode adjustable which characterized in that includes:
the wall casing is annular, and openings at two ends of the wall casing are respectively a flue gas inlet and a flue gas outlet;
the motor actuator is arranged outside the wall shell, and an output shaft of the motor actuator extends into the wall shell;
the deflection silencing piece is fixed on the output shaft and is positioned in the wall shell, and the deflection silencing piece can rotate around the output shaft under the driving action of the output shaft so as to adjust the angle.
2. The flue duct silencer of claim 1, wherein the motor actuator has a plurality of output shafts, and each output shaft is rotatably mounted to the wall housing about its own axis; and different deflection silencing sheets are respectively assembled on each output shaft.
3. The flue duct silencer of claim 2, wherein the motor actuator further includes a motor mounted to the wall housing by a motor mounting flange, and the motor drives each of the output shafts to rotate about its own axis at the same angular velocity through a crank-link mechanism.
4. The flue duct muffler of claim 3, wherein the crank-link mechanism comprises:
the cranks are fixed on the output shafts and correspond to the output shafts one by one;
two ends of the connecting rod are respectively hinged with the two different cranks; the number of the connecting rods is less than 1 than that of the cranks, and each connecting rod connects all the output shafts in sequence;
wherein the shaft of the motor is connected with one of the output shafts.
5. The flue duct muffler of claim 4 further comprising a pointer fixed to the output shaft and a scale plate fixed to the wall housing.
6. The flue gas duct silencer of claim 2, wherein the output shafts are arranged in sequence along a direction from the flue gas inlet to the flue gas outlet of the wall shell, and the axes of the output shafts are arranged along a direction perpendicular to the direction from the flue gas inlet to the flue gas outlet; the axes of all output shafts lie in the same plane.
7. The flue duct silencer of claim 6, wherein the motor actuator is plural, each of the motor actuators being arranged in sequence in a first direction; the first direction is perpendicular to the direction from the smoke inlet to the smoke outlet and perpendicular to the axis of the output shaft in the motor actuator.
8. The flue duct muffler of claim 2 wherein a bearing seat is mounted to the outside of the wall shell; each output shaft penetrates through the wall shell, and two ends of each output shaft are assembled on bearing seats on two sides of the wall shell respectively.
9. The flue duct muffler according to claim 1, further comprising a fixed muffling sheet fixed within the wall shell, and a plate surface of the fixed muffling sheet is parallel to a direction from the flue gas inlet to the flue gas outlet.
10. The flue gas duct silencer according to claim 1 or 9, wherein the silencing sheet comprises a galvanized sheet outer wall and a sound absorbing material layer, wherein small holes are respectively formed in two side plate surfaces of the galvanized sheet outer wall, and an accommodating cavity is formed inside the galvanized sheet outer wall; the sound absorption material layer is fixed in the containing cavity, and gaps are respectively reserved between the sound absorption material layer and the two side plate surfaces of the outer wall of the galvanized sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022895779.1U CN213954006U (en) | 2020-12-03 | 2020-12-03 | Sound cavity mode adjustable flue silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022895779.1U CN213954006U (en) | 2020-12-03 | 2020-12-03 | Sound cavity mode adjustable flue silencer |
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| CN213954006U true CN213954006U (en) | 2021-08-13 |
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| CN202022895779.1U Active CN213954006U (en) | 2020-12-03 | 2020-12-03 | Sound cavity mode adjustable flue silencer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593091A (en) * | 2020-12-03 | 2022-06-07 | 福建龙净脱硫脱硝工程有限公司 | Sound cavity mode adjustable flue silencer |
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2020
- 2020-12-03 CN CN202022895779.1U patent/CN213954006U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593091A (en) * | 2020-12-03 | 2022-06-07 | 福建龙净脱硫脱硝工程有限公司 | Sound cavity mode adjustable flue silencer |
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